Last updated: June 1, 2026

Purl Syntax Reference

All scripting syntax in one table. Use search at the top of the page.

Category Name Syntax Details
EVENTS
Event onEnter onEnter: Cell or object — fires when player enters cell. All handlers run concurrently (repeat/wait loops don't block other objects' init). Cross-object dependencies: use onMessage
Event onExit onExit: Cell or object — fires when player leaves cell
Event onClick onClick: Cell or object — object fires when clicked, cell fires on background clicks (pointer up over empty canvas). clicked = the object actually under the cursor (useful when a component absorbs clicks on its children)
Event onKeyDown onKeyDown "Key": Cell or object — fires when key pressed. Fires on the cell script and on every non-template object; there's no focus, so every matching handler runs per press. Key names are case-insensitive. Keys: Escape, Space, ArrowUp, ArrowDown, ArrowLeft, ArrowRight, a-z, 0-9. Gamepad — single-controller alias: gamepad-a (Space), gamepad-b (Escape), gamepad-x (e), gamepad-y (q), gamepad-up/down/left/right (arrows). Multi-controller: gamepad-N-a/b/x/y/up/down/left/right with N = 1-based pad index (e.g. gamepad-1-a, gamepad-2-a). Pad 1 fires both indexed and unindexed names (back-compat); pads 2+ only fire indexed names. Ctrl+Escape exits to build mode
Event onKeyUp onKeyUp "Key": Cell or object — fires when key released. Same scope, case-insensitivity, and keys as onKeyDown including gamepad and multi-controller forms
Event onHover onHover: Object — mouse enters bounds
Event onHoverEnd onHoverEnd: Object — mouse leaves bounds
Event onDragStart onDragStart: Cell or object — fires when a drag gesture begins past the threshold. Object scope: drag on this object (auto-moves if draggable). Cell scope: drag on empty canvas or on a non-draggable object with no drag handlers (marquee, lasso, slice, swipe)
Event onDrag onDrag: Cell or object — fires each frame while dragging. Use clickX/clickY for current pointer, dragStartX/dragStartY for drag origin
Event onDragEnd onDragEnd: Cell or object — fires once when pointer is released. clickX/clickY is release position; dragStartX/dragStartY is drag origin; dragDuration is total ms
Event onScroll onScroll: Cell or object — mouse-wheel / trackpad scroll. Fires on the object under the pointer if it has a handler, otherwise on the cell (bubbles to an ancestor component). scrollY = vertical amount (mouse notch ≈ ±1, fractional on trackpads; >0 = down/toward you), scrollX = horizontal; clickX/clickY = pointer world position. One scroll = one event (no start/end). Apply zoom multiplicatively
Event onOverlap onOverlap: Object — starts overlapping another. Requires sensor on one object. Use other to reference
Event onOverlapEnd onOverlapEnd: Object — stops overlapping
Event onCollide onCollide: Object — hits a blocker. Use other to reference blocker
Event onMove onMove: or onMove "dir": Object — movement starts. Directions: up, down, left, right
Event onRotate onRotate: or onRotate "dir": Object — rotation starts/changes. Directions: cw (clockwise), ccw (counter-clockwise)
Event onStop onStop: Object — movement stops (any reason: wall hit, input released, path bend)
Event onArrive onArrive: Object — reached moveTo/click-to-move target. Use for waypoint patrol instead of onStop
Event onTick onTick: Object — fires every physics frame (~60fps). deltaTime variable available (seconds). Use for continuous logic
Event onJump onJump: Object — jump triggered. Requires jumpable
Event onLanding onLanding: Object — lands on surface
Event onBounds onBounds: Object — fires when object crosses cell boundary. Optional direction filter: onBounds "left", "right", "top", "bottom". Fires once per crossing. Movable objects only
Event onAudioEnd onAudioEnd: Audio object — fires when non-looping playback finishes. Use for sequencing tracks
Event onSpawn onSpawn: Object — fires when spawned at runtime
Event onDestroy onDestroy: Object — fires before destruction
Event onSubmit onSubmit: Object — fires when Enter pressed in editable text. self.content has the submitted text
Event onDefocus onDefocus: Object — fires when editable text loses focus (click elsewhere or Escape)
Event onBreak onBreak: Peg — fires when constraint breaks (force exceeds breakForce)
Event onMessage onMessage "MSG": Cell or object — receives shout. Top-level only — cannot be nested inside repeat, if, or other blocks. Runs concurrently with other handlers. To react to a message inside a loop, set a variable in the handler and check it in the loop
Event onMessageFrom onMessageFrom "Source" "MSG": Cell or object — receives shout from specific sender. Same top-level restriction as onMessage
Event Combined onClick | onKeyDown "Space": Multiple events trigger same code
COMMANDS
Command goto goto "CellName" Navigate to cell. Directions: north, east, south, west. Transitions: with fade, with slide-up, etc. Reset: clean (reset objects, keep vars), fresh (reset all)
Command goto transition goto "Room" with fade 500 Navigate with transition animation. Duration in ms or expression: random(200,500)
Command goto reset goto "Room" clean or goto "Room" fresh Navigate with reset level. Combinable: goto "Room" clean with fade
Command restart restart Go to start cell + full reset. restart cell restarts current cell
Command endGame endGame Exit play mode. In studio returns to build mode, in player stops the game
Command show show X or show X with fade 300 Make object visible. Transitions: fade, scale, slide-up, slide-down. Text-only: typewriter, word, scramble, redact. Duration in ms or expression: random(200,500)
Command hide hide X or hide X with fade 300 Make object invisible. Transitions: fade, scale, slide-up, slide-down. Text-only: typewriter, word, scramble, redact. Duration in ms or expression: random(200,500)
Command spawn spawn "Template" {params} Create object at runtime from a template (quoted name). Params: x, y, cellX, cellY, custom
Command spawn type spawn shape "Name" {params} Create a fresh object from a prime type — no template needed. Types: shape, text, line, grid, audio, emitter, mask, peg, viewport, data, component; shape sugar: rect/rectangle, circle, ellipse, polygon, path. Params set properties (and reach onSpawn); fully scriptable, destroy-able. For data-driven visuals/HUDs
Command spawn at spawn "Template" at AnchorName Spawn at anchor position/rotation. If anchor is inside a component, spawned object becomes a child
Command destroy destroy X or destroy X with fade 300 Remove object from scene. Works on spawned and design-time objects. Design-time objects reappear on reset. Transitions: fade, scale, slide-up, slide-down. Duration in ms or expression. Targets: name, self, other, parent, siblings, children, #tag
Command addTag addTag self #robot Add tag to object at runtime. Targets: name, self, other, #tag, all type. No-op if tag already exists
Command removeTag removeTag self #robot Remove tag from object at runtime. Same targets as addTag. No-op if tag not present
Command set variable set score 10 Create/update variable
Command set property set X.opacity 0.5 Change object property. Position writes (set X.x, set X.y) and visual writes (rotation, opacity, etc.) are this-frame. Motion writes (velocityX/Y, angularVelocity, gravityScale, etc.) take effect at the next physics tick
Command set property (tween) set X.opacity 0 over 500 Smooth transition over duration (ms). Optional easing
Command set property (easing) set X.x 0.8 over 300 ease-out Easing: linear, ease-in, ease-out, ease-in-out, ease-in-cubic, ease-out-cubic, ease-in-out-cubic
Command set state (tween) set X.state "RED" over 500 Tween from current to target state over N ms
Command set state (tween+mod) set X.state "RED" position over 300 cw Modifiers before over. Optional cw/ccw for rotation direction
Command set (expression) set self.visible sandbags >= 1 The value side accepts any expression — arithmetic (a + b), comparisons (>=, <, ==, !=), boolean ops (and, or, not X), property access, function calls. The expression is evaluated and the result assigned.
Command set (toggle) set X.visible not X.visible Idiom for flipping a boolean property — reads current value, negates it, writes it back.
Command set (array literal) set scores [10, 20, 30] Assign an array literal. Elements can be any expression.
Command set (map literal) set cfg {alt: 30000, fuel: 100} Assign a map literal. Keys are identifiers; values are any expression.
Command set (indexed) set arr[0] 99 or set Data.value[0].field x Replace at index, optionally drilled into a field. Auto-grows arrays with null on out-of-bounds writes.
Command set (deep nested) set cfg.weather.wind.gust 5 Drill into nested maps and set the leaf. Sibling slots stay untouched.
Command push push items 5 Append to the end of an array.
Command push first push first items 99 Prepend to the front of an array.
Command insert insert items at 2 99 Insert at a specific index, shifting subsequent elements. Index out of range is a no-op + console error.
Command remove (index) remove items[3] Remove an array element at index, shifting remaining elements down.
Command remove (key) remove cfg.foo Remove a key from a map (last dotted segment is the key).
Command enable enable X movable Enable capability (movable, jumpable, draggable, keyboard, click, gamepad, subject, follow, avoid). Target: name, self, other, self.Child, parent, siblings, children, #tag
Command disable disable X movable Disable capability. Same targets as enable
Command clear grid clear Grid Clear all cell data
Command clear cell clear Grid.cell[x][y] Clear one cell's data
Command shout shout "MSG" {key: val} Send message to current cell listeners. Params optional, accessed as variables in handler
Command shout global shout "MSG" global Send message to ALL cells' listeners (cross-cell broadcast)
Command shout to shout to X "MSG" {key: val} Send message to specific object or #tag. Params optional
Command reset reset session Reset variables. Scopes: session, game, all, objects (reset objects, keep vars), fresh (reset objects + vars), visits (reset current cell visit count)
Command reset script reset script Reset sequential onClick counter
Command wait time wait 500ms or wait 2s Pause execution. Accepts expressions: wait delay, wait random(1000,3000), wait (baseTime * 2)
Command wait movement wait movement Pause until all movement settles
Command wait movement (target) wait movement self Pause until specific object stops. Also: wait movement ObjName
Command sync sync Synchronize parallel scripts
Command copy copy value Copy to clipboard. Only works from user events (onClick, onKeyDown)
Command log log "text" value Debug output to console
Command openUrl openUrl url [newTab] Open URL in browser. newTab opens in new tab instead of current window
Command post post url {data} HTTP POST request
Command fetch fetch url into var HTTP GET into variable
Command transition transition fade 500 Cell entrance animation. Types: fade, slide-up, slide-down, slide-left, slide-right, zoom
Command return return or return expr Exit the current action, function, or onTick: block early. Inside a function, return expr gives back the value
Command break break Exit current loop
Command save save "checkpoint" Save game state to named slot. Stores all variables, object states, visited cells, spawned objects, physics positions/velocities, and current cell
Command load load "checkpoint" Restore game state from named slot and navigate to saved cell. Sets newGame to false. Silently ignored if slot doesn't exist
Command delete save delete save "checkpoint" Delete a save slot
Command reveal reveal Mask1 0.5 0.5 Punch transparent hole in mask. Args: mask name, x, y (mask-relative coords). Optional: radius, fade. reveal Mask1 self.x self.y 0.05 0.02
Command rehide rehide Mask1 Reset mask fog to fully opaque. Resets base canvas + all revealer layers. rehide Mask1 Player resets only Player's revealer layer. Target accepts names, dotted paths, self/other, and special refs (parent, siblings, root) — e.g. rehide self.Cup.Mask
Command inject inject Source above Target or inject Source below Target Render Source at Target's slot in the draw order, regardless of which component owns either one. Source keeps its parent, transforms, scripts, lifetime — only its render position moves. Both Source and Target accept names, dotted paths (Compo.Child), self, other, and special refs (parent, siblings, root) — including mid-path forms like self.X.children.Y. One injection per object — repeated inject replaces the previous anchor. Runtime-only (volatile per play session)
Command clear inject clear inject Source Remove the injection anchor — Source returns to rendering at its authored position. Common idiom: clear inject self
ANIMATION
Animate group animate X "group" loop Play state group animation. Modes: loop, once, pingpong
Animate group fps animate X "group" fps 12 once Frame mode with custom FPS
Animate group duration animate X "group" duration 500 loop Tween mode with duration per step (ms)
Animate group easing animate X "group" duration 300 ease-in-out Tween easing. Values below
Animate group resume animate X "group" loop resume Don't restart if running; smooth entry when starting
Animate group cw/ccw animate X "group" loop cw Force clockwise rotation interpolation (ccw for counter-clockwise)
Animate group exclusive animate X "group" loop exclusive Stop all other group animations on this object before starting
Animate stop stop animate X Stop all group animations on object
Animate shake shake X 300 Horizontal oscillation (duration in ms)
Animate vibrate vibrate X 300 or vibrate X loop Rapid micro-jitter. Optional intensity (default: 2)
Animate pulse pulse X 300 or pulse X loop Scale breathe effect. Optional scale (default: 1.15)
Animate squeeze squeeze X 300 Squash & stretch. Optional direction: horizontal, vertical
Animate bounce bounce X 300 Vertical hop with squash. Optional height (default: 20)
Animate spin spin X 300 360° rotation. Optional direction: cw, ccw. On components, rotates as a unit; add children for per-child effect
Animate glow glow X 1000 or glow X 500 loop Pulsing glow effect. Optional color: glow X 1500 loop "#ff0000"
Animate sway sway X 5 1.2 rotation Continuous wobble around pivot. Args: amplitude period [axis]. Period in seconds; axis: rotation (default), x, y. Always loops; each instance gets a phase offset so tagged groups don't move in lockstep. Stop with stop X sway
Animate stop effects stop X Stop fire-and-forget effects on object
Animate screenshake screenshake 300 Camera/viewport shake. Optional intensity (default 3): screenshake 200 5. Intensity range: screenshake 2000 1-5 (ramps from 1 to 5). Add loop to repeat. Non-looping damps to zero
Animate stop screenshake stop screenshake Stop camera shake
COLOR
Color saturate saturate X or saturate X 30 Boost saturation of object's colors (fillLayers, strokeColor, textColor). Amount 0–100 HSB units (default 20). Persists. Works on names, self, #tag, all <type>, or scene
Color desaturate desaturate X or desaturate X 60 Reduce saturation. Same args/scope as saturate. desaturate scene 100 = entire viewport b&w via CSS filter; desaturate scene 0 clears
Color huerotate huerotate X 90 Rotate hue in degrees (default 30). Negative reverses. Same target scope
Color lighten lighten X 15 Lighten colors toward white (HSB 0–100, default 20). Stack to ramp
Color darken darken X 20 Darken colors toward black (HSB 0–100, default 20). Stack to ramp
Color invert invert X Invert each color to its complement. No amount
AUDIO
Audio play play Music Start or resume playback
Audio play loop play Music loop Play with looping
Audio play fadeIn play Music fadeIn 2000 Play with volume fade-in (ms)
Audio play tag play #music fadeIn 500 Fan out to every audio object carrying the tag. Combine with loop / fadeIn. Starts a fresh shared player if none was running yet
Audio pause pause Music Pause; next play resumes from where it stopped. Halts even if autoplay or another script is also playing the audio
Audio pause fadeOut pause Music fadeOut 1000 Fade out then pause (ms)
Audio pause tag pause #music fadeOut 500 Fan out to every audio object carrying the tag
Audio stop stop Music Stop and rewind to start. Halts even if autoplay or another script is also playing the audio
Audio stop fadeOut stop Music fadeOut 2000 Fade out then stop (ms)
Audio onAudioEnd onAudioEnd: Fires when non-looping audio finishes playing
Audio volume set Music.volume 0.5 Set volume (0-1)
Audio loop set Music.loop true Set loop property
Audio startMarker set Music.startMarker 5 Start position in seconds
Audio duration set Music.duration 10 Playback duration from start marker in seconds
Audio autoplay Object property Auto-play on cell enter
Audio extend Object property Keep playing across cell transitions
Audio buffered Object property Independent playback per instance (default: true for SFX)
Audio spatial Object property Distance-based volume from camera subject
Audio spatialRange Object property Distance (0-1) where volume reaches 0 (default: 1.0)
EMITTER
Emitter emitterShape Object property Emit shape: "circle" (outward) or "rectangle" (top edge inward)
Emitter emitterRate Object property Particles per second (default: 10)
Emitter emitterBurst Object property Set to N to emit N particles instantly (resets to 0)
Emitter particleLifetime Object property Particle lifetime in ms (default: 1000)
Emitter particleSpeedMin Object property Min speed canvas-units/sec (default: 0.1)
Emitter particleSpeedMax Object property Max speed canvas-units/sec (default: 0.3)
Emitter particleSpread Object property Emission arc degrees — circle: cone width, rectangle: deviation (default: 30)
Emitter particleShape Object property Particle shape: "circle", "square", or "line"
Emitter particleTrailLength Object property Trail positions (0=off, default: 0)
Emitter particleSizeStart Object property Starting size px (default: 6)
Emitter particleSizeEnd Object property Ending size px (default: 2)
Emitter particleOpacityStart Object property Starting opacity 0-1 (default: 1)
Emitter particleOpacityEnd Object property Ending opacity 0-1 (default: 0)
Emitter particleColorA Object property Spawn color range start (default: #ffffff)
Emitter particleColorB Object property Spawn color range end (default: #ffffff)
Emitter particleColorEnd Object property Optional fade-to color over lifetime
Emitter particleGravityX Object property World gravity X (default: 0)
Emitter particleGravityY Object property World gravity Y (default: 0)
Emitter particleDrag Object property Velocity damping 0-1/sec (default: 0)
Emitter emitterGlow Object property Halo glow intensity 0-1 (default: 0)
Emitter emitterGlowSize Object property Halo size multiplier (default: 1.5)
Emitter emitterGlowFlicker Object property Halo flicker amplitude 0-1 (default: 0)
CONTROL FLOW
Control if if condition: Conditional block
Control else else: Alternative block
Control else if else if condition: Chained conditional
Control foreach foreach item in list: Iterate over array or tagged objects
Control repeat repeat: Infinite loop — runs until break or cell exit. Use wait for pacing. Reads live variables each iteration
Control repeat N repeat 5: Loop N times
Control first first #tag where .x > 0: Find first matching object
Control action action name: or action name {a, b, c: default}: Reusable named block. Call with do. Params optional; ones with : default can be omitted at the call site. Use for anything that takes time or changes things in the world
Control do do actionName or do actionName {a: 1, b: x+2} Run a custom action. Pass args in braces
Control function function name(a, b, c): Reusable inline calculation. Body uses only set, if/else, and return. Use for things you compute. The editor flags wait/spawn/play etc. and points you at action
Control call function name(arg1, arg2) Use a function's result inline: set d distance(HAB.x, HAB.y, Goose.x, Goose.y)
TARGETING
Target By name ObjectName Direct reference
Target By tag #tagname All objects with tag
Target By type all shapes All objects of type
Target self self Current object
Target self property self.name, self.x Read/write property on current object
Target parent parent Containing component
Target parent property parent.name, parent.x Read/write property on parent component
Target root root Outermost ancestor — walks the parent chain to the top. Returns the object itself when there is no parent, so writes are always safe
Target root property root.x, other.root.hit Read/write property on the outermost ancestor. Useful from a deeply-nested child that needs to talk to the whole component (e.g. a collision-shape sensor reaching the player)
Target siblings siblings Objects at same level
Target children children Contained objects
Target children property children.opacity Read/write property on all children
Target other other Other object in overlap/collision
Target other property other.name, other.x Read property on the other object in overlap/collision
Target Component child Component.Child Child inside component
Target Self child self.Child.property Access child of current component. Read/write: self.Turret.rotation. Mid-path special refs also work: self.Group1.children.visible, parent.X.children.Y
Target Cross-cell @Cell.Object Object in different cell
Target Cross-cell prop @Cell.Object.property Read property from another cell
Target Cross-cell index @Cell.Data.dataValue.points[i] Drill a dotted path and index it in one expression — no need to cache the cross-cell reference into a variable first
Target State read X.states.StateName.property Read property from a named state
Target Cross-cell state @Cell.Object.states.State.prop Read state property from another cell
PROPERTIES
Property name X.name Object name (read-only)
Property id X.id Object ID (read-only, unique identifier)
Property x X.x Horizontal position (0-1)
Property y X.y Vertical position (0-1)
Property width X.width Width (0-1)
Property height X.height Height (0-1)
Property area X.area Geometric area in cell units² (read-only). Handles rectangle, ellipse, polygon, and curved paths (Bezier sampled). Lines return 0
Property visible X.visible Boolean visibility
Property clickable X.clickable Boolean — accepts clicks
Property opacity X.opacity Transparency (0-1)
Property blendMode X.blendMode Compositing blend mode: normal, multiply, screen, overlay, darken, lighten, color-dodge, color-burn
Property rotation X.rotation Angle in degrees (0-360)
Property flipX X.flipX Horizontal flip
Property flipY X.flipY Vertical flip
Property zIndex X.zIndex Layer order (higher = on top)
Property content X.content Text content
Property textColor X.textColor Text color
Property fontSize X.fontSize Font size (rem)
Property fontFamily X.fontFamily Font family
Property fontWeight X.fontWeight Font weight (normal, bold, etc.)
Property fontStyle X.fontStyle Font style (normal, italic)
Property textDecoration X.textDecoration Text decoration (none, underline, etc.)
Property textAlign X.textAlign Text alignment (left, center, right)
Property textPadding X.textPadding Text padding
Property lineHeight X.lineHeight Line spacing multiplier (textbox only, default 1.3)
Property verticalAlign X.verticalAlign Vertical text alignment: top, center, bottom (textbox only)
Property editable X.editable Allow typing at runtime (text only). Click to focus, Enter to submit, Escape to revert
Property fillColor X.fillColor Fill color (read/write shorthand)
Property color.color X.color.color Fill color (layer path)
Property color.opacity X.color.opacity Color layer opacity (0-1)
Property fill.color X.fill.color Fill color (alias for color.color)
Property strokeColor X.strokeColor Border color
Property strokeWidth X.strokeWidth Border width
Property strokeStyle X.strokeStyle Border style (solid, dashed, dotted)
Property cornerRadius X.cornerRadius Corner rounding
Property shadowX X.shadowX Shadow horizontal offset
Property shadowY X.shadowY Shadow vertical offset
Property shadowBlur X.shadowBlur Shadow blur radius
Property shadowColor X.shadowColor Shadow color
Property glowBlur X.glowBlur Glow spread radius
Property glowColor X.glowColor Glow color
Property glowIntensity X.glowIntensity Glow intensity (1-10, higher = more solid)
Property tags set X.tags ["a", "b"] Object tags (array of strings)
Property spriteFrame X.spriteFrame Current sprite sheet frame (0-based). Requires sprite image fill
Property state X.state Current state name (any object)
Property set state set X.state "RED" Apply state (composable — patches delta onto current)
Property set state next set X.state next Cycle to next available state. Wraps around. No-op if object has 0 or 1 states
Property state modifier: none set X.state "Y" none Skip spatial properties (position, size, rotation, flip)
Property state modifier: position set X.state "Y" position Apply only position + non-spatial
Property state modifier: rotate set X.state "Y" rotate Apply only rotation/flip + non-spatial
Property state modifier: scale set X.state "Y" scale Apply only size + non-spatial
Property state combined set X.state "Y" position rotate Modifiers combine: position + rotation filter
Property mass X.mass Object mass (affects forces)
Property gravityScale X.gravityScale Gravity multiplier (0=weightless, 1=normal, 2=heavy)
Property windScale X.windScale Wind multiplier (0=immune, 1=normal, 2=extra)
Property dragScale X.dragScale Drag multiplier (0=no drag, 1=normal, 2=heavy)
Property rotatable X.rotatable Enable angular physics (tipping, torque)
Property level X.level Elevation level (integer, default 0). Objects at different levels don't collide, aren't detected by sensors, and are excluded from nearby(). Set to ALL (-999) to collide at every level
Property ghost X.ghost Invisible to blocking collision. Sensors are auto-ghost
Property perspectiveX X.perspectiveX Perspective scroll factor X (0=stationary, 1=full scroll)
Property perspectiveY X.perspectiveY Perspective scroll factor Y (0=stationary, 1=full scroll)
Property mask X.mask Boolean — treat this shape as a mask. The shape becomes the visible covering, revealers punch holes through it. Mutually exclusive with revealer
Property revealRadius X.revealRadius Mask default — radius used by revealers carving through this mask (revealer can override)
Property revealFade X.revealFade Mask default — edge fade width (revealer can override)
Property revealNoise X.revealNoise Mask default — edge noise 0–1 (revealer can override)
Property revealer X.revealer Boolean — auto-reveal overlapping masks as object moves. Mutually exclusive with mask
Property revealerRadius X.revealerRadius Reveal radius in mask-relative units
Property revealerFade X.revealerFade Reveal edge fade (blur width, mask-relative units)
Property revealerNoise X.revealerNoise Reveal edge noise (0=smooth, 1=max)
Property revealerShape X.revealerShape Reveal shape: circle or rect
Property revealTags set X.revealTags ["mask1"] Only reveal masks with matching tags (empty = all masks)
Property revealerRehide X.revealerRehide Boolean — fog returns when revealer moves away
Property revealerRehideSpeed X.revealerRehideSpeed Delay before fog starts regrowing (seconds)
Property revealerRehideGrowth X.revealerRehideGrowth Regrowth time — how long each stamp takes to close (seconds, 0=instant)
Property revealerRehideRate X.revealerRehideRate Rehide speed multiplier (1=normal, 2=twice as fast)
Property revealerRehideStopThreshold X.revealerRehideStopThreshold Pause rehide when stopped briefly (seconds, 0=disabled)
Property invert X.invert Mask only — when true, the mask shape is hidden by default and the revealer paints it in (fill mode, e.g. cup-fill, gauges). When false (default), the mask shape is the visible covering and the revealer erases it (fog-of-war mode)
Property polygonPoints set Shape.polygonPoints[0].x 0.5 Polygon vertex (0–1 bbox-local, NOT world). Index from hover tooltip on vertex. World pos = obj.x − obj.pivot.x·obj.width + vertex.x·obj.width (then rotation/flip applied). Triggers re-render
Property pathSegments set Shape.pathSegments[2].cp1y 0.3 Path segment fields (0–1 bbox-local). Each segment has x,y (anchor) plus cp1x,cp1y,cp2x,cp2y (cubic control points for C segments)
Property trail X.trail Enable motion trail (boolean)
Property trailLength X.trailLength Trail distance in world units (default 0.3)
Property trailOpacity X.trailOpacity Trail starting opacity (default 0.3)
Property trailColor X.trailColor Trail color (default: object fill)
Property trailScale X.trailScale Trail taper — tail/head width ratio (default 0.3, 0=pointed, 1=uniform)
Property trailWidth X.trailWidth Trail width multiplier of min(width, height) (default: 1)
Property lineX1 X.lineX1 Line start X coordinate
Property lineY1 X.lineY1 Line start Y coordinate
Property lineX2 X.lineX2 Line end X coordinate
Property lineY2 X.lineY2 Line end Y coordinate
Property lineStartMarker X.lineStartMarker Line start marker: none, arrow, circle, square, diamond
Property lineEndMarker X.lineEndMarker Line end marker: none, arrow, circle, square, diamond
Property lineCap X.lineCap Line cap style: butt, round, square
Property pegType X.pegType Peg constraint type: pin (hinge) or weld (rigid)
Property pegDamping X.pegDamping Swing friction (0 = swings forever, 1 = stops quickly)
Property pegBreakForce X.pegBreakForce Force threshold to break the peg connection
Property springStiffness X.springStiffness Spring stiffness (0 = rigid rod, higher = more elastic). Spring objects only
Property springDamping X.springDamping Spring energy dissipation. Spring objects only
Property springBreakForce X.springBreakForce Force threshold to break the spring
Property gradient.angle X.gradient.angle Gradient rotation (0-360)
Property gradient.gradientType X.gradient.gradientType Gradient type: linear or radial
Property gradient.opacity X.gradient.opacity Gradient layer opacity (0-1)
Property pattern.pattern X.pattern.pattern Pattern type name
Property pattern.scale X.pattern.scale Pattern scale
Property pattern.color X.pattern.color Pattern color
Property pattern.opacity X.pattern.opacity Pattern layer opacity (0-1)
Property noise.noiseType X.noise.noiseType Noise type: fractalNoise or turbulence
Property noise.scale X.noise.scale Noise scale
Property noise.intensity X.noise.intensity Noise intensity (0-1)
Property noise.monochrome X.noise.monochrome Grayscale noise (boolean)
Property noise.opacity X.noise.opacity Noise layer opacity (0-1)
Property image.mode X.image.mode Image mode: fill, fit, or tile
Property image.scale X.image.scale Image scale
Property image.opacity X.image.opacity Image layer opacity (0-1)
Property innerShadow.color X.innerShadow.color Inner shadow color
Property innerShadow.blur X.innerShadow.blur Inner shadow blur radius (px)
Property innerShadow.offsetX X.innerShadow.offsetX Inner shadow X offset (px)
Property innerShadow.offsetY X.innerShadow.offsetY Inner shadow Y offset (px)
Property innerShadow.opacity X.innerShadow.opacity Inner shadow layer opacity (0-1)
TIME SCALE
Time Scale Object set self.timeScale 0 Per-object time scale override (0=frozen, 0.5=half, 1=normal, 2=double). Overrides Cell.timeScale for this object
Time Scale Cell set Cell.timeScale 0 Time scale for all objects in the cell. Per-object timeScale overrides this. Supports over: set Cell.timeScale 0 over 500
OBJECT VARIABLES
Object var set set self.energy 100 Per-object variable (any name not a built-in property)
Object var read self.energy Read object variable in expressions
Object var tag set set #robots.energy 50 Set on each tagged object independently
Object var children set children.speed 3 Set on each child independently
Object var foreach foreach r in #robots: set r.score r.score + 1 Per-object in loops
Object var nested dict set self.cupData.waterMass 0 Custom dict on an object — writes preserve sibling fields; reads walk the dict
MOVEMENT
Movement cellX X.cellX Grid column (0-based). Writable: set X.cellX 2
Movement cellY X.cellY Grid row (0-based). Writable: set X.cellY 3
Movement cellXTo X.cellXTo Destination column during a transport-to-cell movement. Returns undefined when no cell movement is in flight (cellX/cellY are then authoritative). Read-only
Movement cellYTo X.cellYTo Destination row during a transport-to-cell movement. Returns undefined when no cell movement is in flight (cellX/cellY are then authoritative). Read-only
Movement moving X.moving Boolean — is moving. Read-only
Movement direction X.direction up, down, left, right, none. Read-only
Movement velocityX X.velocityX Horizontal velocity. Writable: set X.velocityX 0.5 sets absolute velocity. Reading is this-frame; the new value is applied at the next physics tick (next-frame motion change)
Movement velocityY X.velocityY Vertical velocity. Writable: set X.velocityY -0.3 sets absolute velocity. Same next-frame timing as velocityX
Movement moveAngle X.moveAngle Movement angle in degrees (0=right, 90=down, -1=stopped). Read-only
Movement moveSpeed X.moveSpeed Movement speed magnitude. Read-only
Movement movedSinceSpawnX X.movedSinceSpawnX Signed horizontal displacement since spawn / cell entry (current x − spawn x). Negative when moved left. Returns to 0 if object returns to spawn. Read-only
Movement movedSinceSpawnY X.movedSinceSpawnY Signed vertical displacement since spawn / cell entry. Negative when moved up. Read-only
Movement distanceTraveled X.distanceTraveled Cumulative engine-integrated path length since spawn. Always grows. Excludes teleports (set self.x / set self.y jumps). Read-only
Movement angularVelocity X.angularVelocity Rotation speed in deg/sec (requires rotatable). Writable: set X.angularVelocity 30 spins object next frame. Same next-frame timing as velocityX/Y
Movement followDistance X.followDistance Current follow/avoid distance. Read/write. Only available when follow/avoid is enabled
MOVABLE
Movable Enable enable X movable Enable with defaults
Movable speed enable X movable speed 0.5 Max velocity (default: 0.3)
Movable acceleration enable X movable acceleration 0.5 Seconds to reach max speed (0=instant, default: 0)
Movable deceleration enable X movable deceleration 1 Seconds to stop from max speed (0=instant, default: 0.3)
Movable style enable X movable style slide Animation: teleport, slide, jump, fade (default: teleport)
Movable axis enable X movable axis x Constrain to one axis: x (horizontal only), y (vertical only), or forward (steering mode)
Movable steer enable X movable axis forward steer 1.5 Steering turn rate multiplier (default 1). Only with axis forward
Movable path enable X movable speed 0.3 path Track Constrain movement along a named path (line, curve, or polygon). Object moves forward/back along the path instead of freely. Combine with speed, steer, etc.
Movable path reverse enable X movable path Track reverse Reverses path direction — flips what "forward" means
Movable path span enable X movable path Track span 0.8 Two-point path binding: front/rear contact points separated by object width × span factor (default 1.0). Requires steer or faceTravel. Object straddles curves naturally
Movable faceTravel enable X movable path Track faceTravel Face direction of travel on path. Flips 180° when reversing. Implies steer
Movable turnaround enable X movable path Track faceTravel turnaround Smooth rotation when direction changes (uses steerRate). Modifier for faceTravel
Movable facing enable X movable facing Auto-rotate to face movement direction (smooth lerp). The right side of the object (0°) is treated as the front. Mutually exclusive with rotatable and axis forward
Movable stable set X.stable true Geometric collision (default off). When on: no momentum transfer between movers. Use for vehicles in top-down games where movers should stop cleanly on contact. Also: enable X movable stable
Movable dodge enable X movable dodge Steer around other moving objects (axis=forward only). On/off toggle
Movable Combined enable X movable speed 0.5 axis x deceleration 0.1 Multiple params
Movable Disable disable X movable Turn off
INPUT
Input keyboard enable X keyboard WASD + arrow keys control
Input click enable X click Click-to-move control
Input gamepad enable X gamepad Gamepad left stick + D-pad (pad 1 by default)
Input gamepad-index enable X gamepad index N Route a specific connected pad (1-based: 1 = first, 2 = second, …). Use to drive separate objects from separate controllers in local multiplayer
Input script enable X script Script input — responds to press/release commands only, not physical keyboard. Use for AI-controlled objects, virtual buttons, automation
Input multi-input enable X keyboard then enable X gamepad Multiple inputs combine — keyboard + gamepad are additive, click is fallback
Input Disable disable X keyboard Remove specific input type
Input none (default) Physics only, no player control
JUMPABLE
Jumpable Enable enable X jumpable Enable with defaults
Jumpable height enable X jumpable height 0.8 Jump impulse (default: 0.5)
Jumpable multijump enable X jumpable multijump 2 Max jumps before landing (default: 1)
Jumpable key enable X jumpable key "w" Custom jump key (default: Space)
Jumpable Combined enable X jumpable height 0.6 multijump 2 Multiple params
Jumpable Disable disable X jumpable Turn off
Jumpable jump jump X Trigger jump impulse from script. Bypasses key input and multi-jump counter
Jumpable jump height jump X height 0.8 Jump with height override. Accepts expressions: jump self height random(0.3, 0.8)
IMPULSE (motion writes — applied at the next physics tick)
Impulse impulse impulse X vx vy Add velocity to object. Additive — accumulates with existing velocity. Next-frame
Impulse impulse expr impulse self random(-0.2, 0.2) -0.5 Accepts expressions for both vx and vy
Impulse set velocity set X.velocityX 0.5 Set absolute velocity (not additive). Also: velocityY, vx, vy. Next-frame
TRANSPORT (next-frame start — first tween sample is processed at the next physics tick)
Transport basic transport X to 0.5 0.5 over 1000 Smoothly move to (x, y) over duration (ms). Real position updates each frame
Transport easing transport X to 0.5 0.5 over 500 ease-in-out With easing: ease-in, ease-out, ease-in-out, ease-in-cubic, ease-out-cubic, ease-in-out-cubic
Transport dynamic transport X to Player.x Player.y over 300 Target can be any expression (evaluated at call time)
Transport multi transport #tag to 0.5 0.5 over 500 Transport all tagged objects. Also: self, siblings, children
Transport to cell transport X to cell 5 0 over 400 Resolve (col, row) on the target's snapToGrid to world coords and run as a transport. During the movement self.cellX/cellY stay at the source cell and self.cellXTo/cellYTo hold the destination; on arrival the engine commits the destination into cellX/cellY and clears cellXTo/cellYTo. Target without snapToGrid is warned and skipped.
Transport notes No collision, no movable required. Physics bypassed during transit. Fires onMove/onStop events. New transport replaces old. set X.x cancels
MOVETO (next-frame start — first steering correction is applied at the next physics tick)
MoveTo basic moveTo X 0.5 0.5 Move to position using movable speed. Obeys physics — collides with blockers, affected by gravity
MoveTo self moveTo self 0.5 0.5 Move current object to position
MoveTo dynamic moveTo self Player.x Player.y Target can be any expression
MoveTo multi moveTo #robots Player.x Player.y Move all tagged objects. Also: self, other, siblings, children
MoveTo notes Requires movable. Uses object's speed/acceleration. Uses A* pathfinding around static obstacles. Fires onArrive on arrival (use instead of onStop for waypoint logic). Keyboard/gamepad overrides direction. New moveTo replaces old target
SYNTHETIC KEYS
Press basic press "q" Send a script key-down to the current object. Fires onKeyDown handlers. Objects need Script input enabled to respond
Press target press "Space" on Tank Inject key-down on a specific object. Key is stored per-object — does not affect other objects' input
Press movement press "ArrowLeft" Also updates the input system — movable+script objects will start moving
Release basic release "q" Send a script key-up to the current object. Fires onKeyUp handlers
Release target release "Space" on Tank Inject key-up on a specific object
Release movement release "ArrowLeft" Clears the key from the input system
Script Keys cell context press "Space" When called from a cell script, injects globally — all objects with Script input respond
Script Keys per-object press "ArrowUp" on "CarAI" Only CarAI sees this key. Physical keyboard and other objects' synthetic keys are independent
Script Keys hold pattern press without matching release keeps the key held. Standard pattern: press "q" → (wait or tick logic) → release "q"
Script Keys use case AI control: sense target → calculate bearing → press "q" to rotate → press "Space" to fire. Also powers virtual buttons and automated movement
KEY REMAPPING
Keys remap direction set self.keys.up "w" Remap a movement direction to a different key. Directions: up, down, left, right
Keys disable direction set self.keys.down "none" Disable a movement direction — no key will trigger it
Keys remap jump set self.keys.jump "w" Remap the jump key
Keys read self.keys.up Read current key mapping for a direction. Returns "none" if disabled
FOLLOW / AVOID
Follow follow enable Dog follow "Player" Object moves toward target. Requires movable. Target can be a variable: enable self follow myTarget
Follow distance enable Dog follow "Player" distance 0.2 Maintain distance from target (default: 0 = reach target). Negative = overlap. Distance is edge-to-edge by default
Follow followDistance set Dog.followDistance 0.1 Read/write follow distance at runtime without re-specifying target. Only works when follow/avoid is active
Follow center enable Dog follow "Player" distance 0.2 center Measure distance center-to-center instead of edge-to-edge
Follow rigid enable self follow leader distance 0.05 rigid Deterministic trail follow. Follower traces target's exact position history at fixed arc-length offset. No breadcrumb intelligence — pure position replay. Ideal for snake-like chains
Follow tag enable #robots follow "Player" All tagged objects follow target
Follow avoid enable Dog avoid "Player" Object moves away from target
Follow avoid distance enable Dog avoid "Player" distance 0.3 Flee only when closer than distance
Follow deadZone enable Dog follow "Player" deadZone 0.02 Stop within this distance of target (default: 0.015). Prevents fidgeting
Follow arrival enable Dog follow "Player" arrival 0.15 Begin decelerating within this distance (default: 0.08). Larger = smoother
Follow steering enable Tank follow "Player" Steered objects (axis forward) automatically turn toward target and drive forward
Follow pathfinding enable Dog follow "Player" pathfinding A* pathfinding around static obstacles when stuck. Follower routes around blockers to reach breadcrumb waypoints
Follow disable disable Dog follow Stop following or avoiding
Follow priority Manual input (keyboard, gamepad) overrides follow direction
PHYSICS ZONES
Zone enable enable WaterRegion zone gravity 0.3 drag 0.8 Object becomes a physics zone — overrides cell physics for contained objects
Zone gravity enable X zone gravity 0 Override gravity (0 = weightless)
Zone wind enable X zone wind 5 windAngle 0 Override wind magnitude and direction (degrees, 0=right, 90=down)
Zone drag enable X zone drag 0.8 Override drag coefficient (0=vacuum, 1=thick)
Zone flow enable X zone flowX 0.3 Constant drift (mass-independent, like conveyor/current). Also: flowY
Zone combined enable X zone gravity 0 drag 0 Multiple overrides. Omitted params use cell defaults
Zone affects enable X zone gravity 0.3 affects #swimmer Only affect objects with matching tag. Multiple tags use OR logic: affects #light #paper. Omit for all objects (default)
Zone disable disable X zone Deactivate zone — physics reverts to cell defaults
Zone containment Object is "in" zone when its center point is inside the zone's collision shape
Zone priority Smallest zone wins when multiple zones overlap
SPAWN PARAMS
Spawn position spawn "T" {x: 0.5, y: 0.3} Spawn at specific position
Spawn velocity spawn "T" {vx: 2, vy: -1} Spawn with initial velocity
Spawn combined spawn "T" {x: self.x, y: self.y, vx: 2, vy: -1} Position + velocity. Other params pass to onSpawn
Spawn at anchor spawn "T" at MuzzlePoint Spawn at anchor's position and rotation
Spawn at + params spawn "T" at MuzzlePoint {vx: 1} Anchor position + custom params
DRAGGABLE
Draggable Enable enable X draggable Enable basic drag
Draggable once enable X draggable once Can only drag one time
Draggable collision enable X draggable collision Respect blockers while dragging
Draggable discrete enable X draggable discrete Grid objects move cell-by-cell
Draggable discrete occupy enable X draggable discrete occupy Reject drop if cell occupied
Draggable Combined enable X draggable discrete occupy collision Multiple options
Draggable Disable disable X draggable Turn off
COLLISION
Collision enable blocking enable X blocking Enable collision blocking. Optional affects #tag to only block tagged movers
Collision disable blocking disable X blocking Disable collision blocking
Collision blocking expr set X.blocking "self.color != other.color" Conditional blocking expression
Collision enable sensor enable X sensor Enable overlap detection. Optional affects #tag to only detect tagged objects
Collision disable sensor disable X sensor Disable overlap detection
Collision enable phase enable X phase affects #tag Phase through blockers. Without affects, phases through all. With affects #tag, only phases through tagged blockers
Collision disable phase disable X phase Disable phasing (resume normal collisions)
Collision ghost set X.ghost true Invisible to blocking collision. Sensors are auto-ghost
Collision oneWay set X.oneWay true One-way platform (pass through from below)
Collision pullable set X.pullable true Can be pulled by other objects
Collision friction set X.friction 0.5 Surface friction (0-1)
Collision restitution set X.restitution 0.5 Bounciness (-1 to 1). Negative absorbs bounce (sticky surface)
GRID
Grid snapToGrid set X.snapToGrid "GridName" Attach object to grid
Grid cellX set X.cellX 2 Set grid column
Grid cellY set X.cellY 3 Set grid row
Grid cell data write set Grid.cell[x][y].prop value Store metadata
Grid cell data read Grid.cell[x][y].prop Read metadata
DATA
Data dataValue MyData.dataValue The DATA prime's content. Any ScriptValue (scalar, array, map, nested). Read or replace as a whole, or use any of the structured-data commands above (set/push/insert/remove, indexed/dotted paths)
Data nested read MyData.dataValue[2].field or MyData.dataValue.config.maxAlt Drill into arrays / maps with bracket index + dot path
Data nested write set MyData.dataValue[0].score 99 Replace at a path. Auto-grows arrays with null on out-of-bounds writes
Data dynamic map key set MyData.dataValue[key] value Bracket index can be a variable: a number indexes a list, anything else is a map key. Seed the container as a map first (set MyData.dataValue {}) — an undefined start is treated as a list
Data in-place loop edit foreach p in MyData.dataValue: set p.field x Mutate list elements in place — O(N) and the changes stick. Prefer over rewriting whole entries by index (set arr[i] {...}) in a loop, which gets slow on large lists
Data append push MyData.dataValue 99 Append to array at any nested path: push MyData.dataValue.records {...}
Data length length(MyData.dataValue) Array length, map key count, or string character count
Data replace whole set MyData.dataValue {fresh: "shape"} Replace the entire content with a new value
Data dataLive set MyData.dataLive true Storage selector: false (default) = baked into project file, resets each Play; true = stored on this device, mutates across plays. Toggling migrates the data between the two stores
Data cross-cell read @OtherCell.MyData.dataValue Read a Data prime in a different cell
CAMERA
Camera subject enable X subject Camera follows this object
Camera disable subject disable X subject Stop camera following
Camera canvasDraggable set Cell.canvasDraggable false Disable manual panning
Camera zoom set Camera.zoom 2 Zoom level (1 = default, 2 = 2x closer). Read/write: Camera.zoom returns current value
Camera x set Camera.x 1.5 Viewport center X in world coordinates. Read/write. Clamped to cell bounds
Camera y set Camera.y 0.5 Viewport center Y in world coordinates. Read/write. Clamped to cell bounds
Camera aspectRatio set Camera.aspectRatio 1.78 Viewport aspect ratio (width/height). Read/write. Set to Screen.aspectRatio to fill screen
Camera viewportWidth Camera.viewportWidth Visible width in world units (read-only)
Camera viewportHeight Camera.viewportHeight Visible height in world units (read-only)
Camera subjectTransition set Camera.subjectTransition 500 Duration (ms) for smooth pan when switching subjects. 0 = snap (default)
SCREEN
Screen aspectRatio Screen.aspectRatio Actual device/window aspect ratio (read-only)
Screen width Screen.width Window width in pixels (read-only)
Screen height Screen.height Window height in pixels (read-only)
CELL PROPERTIES
Cell width Cell.width Cell width in screens (read-only)
Cell height Cell.height Cell height in screens (read-only)
Cell gravity set Cell.gravity 1.5 Vertical acceleration (-10 to 10)
Cell wind set Cell.wind 0.3 Wind magnitude (-10 to 10)
Cell windAngle set Cell.windAngle 90 Wind direction (0=right, 90=down)
Cell drag set Cell.drag 0.1 Air drag
Cell timeScale set Cell.timeScale 0 Time scale for all objects (0=paused, 0.5=half, 1=normal, 2=double). Supports over for smooth transition: set Cell.timeScale 0 over 500
Cell backgroundColor set Cell.backgroundColor "#ff0000" Cell background color
Cell backgroundPattern set Cell.backgroundPattern "grid" Cell background pattern
Cell patternColor set Cell.patternColor "rgba(0,0,0,0.2)" Pattern overlay color
Cell patternScale set Cell.patternScale 1.5 Pattern scale (0.5-2)
FUNCTIONS
Math random random(1, 6) random() returns 0-1 float. random(min, max) returns integer when both args are integers, float when either has decimals. random(1, 6, float) forces float mode
Math floor floor(x) Round down
Math ceil ceil(x) Round up
Math round round(x) Round to nearest
Math abs abs(x) Absolute value
Math min min(a, b) Smaller value
Math max max(a, b) Larger value
Math hash hash(values...) Hash from any number of values. hash(x, y), hash(#tag.prop). Deterministic — same inputs always give same result
Math sin sin(degrees) Sine of angle in degrees. sin(90) → 1
Math cos cos(degrees) Cosine of angle in degrees. cos(0) → 1
Math atan2 atan2(y, x) Angle in degrees from coordinates. atan2(1, 0) → 90
Math cardinal cardinal(angle) Angle to direction: right, down, left, up
Arrays length length(arr) Array element count, string character count, or map key count. Returns 0 for any other value
Arrays index arr[i] Element at index. Strings supported too: "hello"[1] → "e". Out-of-range or non-indexable returns 0.
Arrays range range(5) or range(0, 5) range(n) returns [0..n-1]. range(min, max) returns [min..max] inclusive
Arrays shuffle shuffle(arr) Randomize array order
Arrays pick pick(arr) Random element from array
Conditions visited visited("Cell") Boolean — has cell been visited
Conditions visits visits("Cell") Number of times cell was visited
Conditions hasObject hasObject("Name") Boolean — does object exist in current cell
Conditions hasSave hasSave("checkpoint") Boolean — does save slot exist
Conditions get get("scope.key") Read variable value (returns undefined if unset)
Grid isEmpty isEmpty("Grid", x, y) Check if grid cell has no object
Grid emptyCells emptyCells("Grid") Array of {x, y} for empty cells
Grid cellsWhere cellsWhere("Grid", "prop", "==", val) Find cells by metadata
Grid floodfill floodfill("Grid", x, y, "prop", val, connectivity) Find connected cells. Connectivity: 4 (cardinal) or 8 (default, + diagonal)
Grid minimax minimax("Grid", "prop", "AI", "Human", depth, empty, winLen) AI best move for N-in-a-row games. Returns {x, y} or 0
SPATIAL
Spatial distance distance(self, Target) Euclidean distance between two objects (0–1 coords). Works with self, other, or object names
Spatial nearby nearby(self, 0.2) or nearby(self, 0.2, #tag) Objects within radius, sorted by distance. Returns [{name, x, y, distance}]. Optional tag filter. Level-filtered: only returns objects at the same level as the reference (ALL level sees everything)
Spatial nearest nearest(self, #coin) Closest object to reference. Filter by #tag, name, or "sibling". Also: nearest(x, y, #tag) from coordinates. Add rank for Nth nearest: nearest(self, #robot, 2). Returns {name, x, y, distance} or 0. Level-filtered (same as nearby). Store in a variable to read fields: set t nearest(...) then t.x, t.y, t.name, t.distance. To store per-object, copy to properties: set self.tx t.x
Spatial intersects intersects(Paddle, Target) SAT collision test. Also: intersects(self, #tag) — true if any tagged object overlaps. Level-filtered: objects at different levels never intersect (ALL level intersects everything)
Spatial randomFree randomFree(self, 0.3) or randomFree(x, y, 0.3) Random unblocked position within radius. Uses pathfinding bitmap. Returns {x, y} or 0. Two forms: object ref (current position as center) or coordinates (fixed point for patrol). Level-filtered
Spatial canSee canSee("Grid", x1, y1, x2, y2, "wall") Line of sight via Bresenham. Blocked by cells where the given property is truthy. Default prop: "wall"
Spatial pathfind pathfind("Grid", x1, y1, x2, y2, "wall") A* pathfinding. Returns [{x, y}] waypoints (excl. start, incl. goal). Default blocker: "wall"
Spatial generateMaze generateMaze("Grid", "wall") Recursive backtracker maze. Sets cell data: true = wall, false = passage. Best with odd-dimension grids
BUILT-IN VARIABLES
Variable random random Fresh random number 0-1 each access
Variable currentCell currentCell Name of the current cell
Variable clicks clicks How many times current object was clicked
Variable clickX clickX Pointer X in world units when the current event fired. Available in onClick, onDrag*, onHover*
Variable clickY clickY Pointer Y in world units when the current event fired. Available in onClick, onDrag*, onHover*
Variable dragStartX dragStartX Pointer X in world units when the current drag began. Available in onDragStart, onDrag, onDragEnd (cell + object). Combine with clickX to measure drag extent
Variable dragStartY dragStartY Pointer Y in world units when the current drag began. Available in onDragStart, onDrag, onDragEnd (cell + object)
Variable dragDuration dragDuration Milliseconds since the current drag began. Available in onDrag, onDragEnd. Use with distance to detect swipes
Variable scrollX / scrollY scrollY Wheel/trackpad scroll amount in onScroll. deltaMode-normalized (mouse notch ≈ ±1, fractional on trackpads). scrollY > 0 = down/toward you; scrollX > 0 = right. Direction + proportionality are stable; absolute magnitude is device-dependent
Variable shiftKey / ctrlKey / altKey / metaKey shiftKey Boolean — was that modifier held when the current pointer gesture began. Snapshot at pointer-down, so it holds through onClick / onDragStart / onDrag / onDragEnd of one gesture. metaKey = Cmd (macOS) / Win; prefer ctrlKey for cross-platform shortcuts
Variable clicked clicked In onClick, the object actually under the cursor — even when a parent component absorbs the click. Read props (clicked.name) and tags (if clicked is #place). Mirrors other from collisions
Variable deltaTime deltaTime Frame time in seconds. Available in onTick. Multiply speeds by this for frame-rate independence
Variable newGame newGame True on normal cell entry, false when restored from a save (load command or auto-save resume). Use if newGame: to guard variable initialization
OPERATORS
Operator Arithmetic + - * / % Math operations (% is modulo)
Operator Comparison == != > < >= <= Compare values
Operator Logical and or not Boolean logic
Operator Tag check X is #tag Check if object has tag
Operator Tag check (negated) X is not #tag Check if object does NOT have tag
Operator Array access arr[i] or arr[i].prop Get element or property
AGGREGATES
Aggregate all all #tag.prop == value True if every tagged object matches
Aggregate any any #tag.prop == value True if at least one matches
Aggregate count count #tag.prop == value Number of tagged objects that match
Aggregate count (simple) count #tag Number of objects with tag (no condition)
BLOCK STYLES
Syntax Colon onClick: + indented block Indentation-based
Syntax Braces onClick { ... } Brace-delimited
Syntax Single-line onClick: show Panel One-liner