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<!DOCTYPE html><html lang="en" style="font-size:16px"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><link rel="icon" href="./static/favicon.png"><meta name="description" content="LittleJS is a lightweight HTML5 game engine with fast WebGL rendering, physics, particles, sound, and more!"><meta name="keywords" content="javascript, game engine, html5, webgl, 2d, game development, indie games"><meta name="author" content="Frank Force"><meta property="og:title" content="LittleJS - The Tiny JavaScript Game Engine"><meta property="og:description" content="Lightweight HTML5 game engine with WebGL rendering, physics, and sound"><meta property="og:type" content="website"><title>Source: src/engineTileLayer.js</title><!--[if lt IE 9]>
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id="VuAckcnZhf"><nav class="navbar"><div class="navbar-left-items"><div class="navbar-item"><a id="" href="https://github.com/KilledByAPixel/LittleJS" target="_blank">GitHub</a></div><div class="navbar-item"><a id="" href="https://killedbyapixel.github.io/LittleJS/examples/" target="_blank">Examples</a></div><div class="navbar-item"><a id="" href="https://github.com/KilledByAPixel/LittleJS/blob/main/FAQ.md" target="_blank">FAQ</a></div></div><div class="navbar-right-items"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#light-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div><nav></nav></nav></div><div class="toc-container"><div class="toc-content"><span class="bold">On this page</span><div id="eed4d2a0bfd64539bb9df78095dec881"></div></div></div><div class="body-wrapper"><div class="main-content"><div class="main-wrapper"><section id="source-page" class="source-page"><header><h1 id="title" class="has-anchor">src_engineTileLayer.js</h1></header><article><pre class="prettyprint source lang-js"><code>/**
* LittleJS Tile Layer System
* - Renders large tile-based levels efficiently using cached canvases
* - Unlimited tile layers with automatic canvas allocation
* - Layers support both rendering and collision detection
* - Direct canvas2d drawing access for custom tile rendering
* - TileLayer for rendering, TileCollisionLayer for physics
* - Collision callbacks for tile interactions with objects
* - Optimized raycast support for tile-based physics
* - Integration with Box2D physics via Box2DTileLayer plugin
* @namespace TileLayers
*/
'use strict';
///////////////////////////////////////////////////////////////////////////////
// Tile Layer System
/** Keep track of all tile layers with collision
* @type {Array<TileCollisionLayer>}
* @memberof TileLayers */
const tileCollisionLayers = [];
/** Get tile collision data for a given cell in the grid
* @param {Vector2} pos
* @param {boolean} [solidOnly] - Only check solid layers?
* @return {number}
* @memberof TileLayers */
function tileCollisionGetData(pos, solidOnly=true)
{
// check all tile collision layers
for (const layer of tileCollisionLayers)
if (!solidOnly || layer.isSolid)
if (pos.arrayCheck(layer.size))
{
const data = layer.getCollisionData(pos);
if (data) return data;
}
return 0;
}
/** Check if a tile layer collides with another object
* @param {Vector2} pos
* @param {Vector2} [size=vec2()]
* @param {EngineObject|TileCollisionCallback} [callbackObject] - Callback, engine object, or undefined
* @param {boolean} [solidOnly] - Only check solid layers?
* @return {TileCollisionLayer}
* @memberof TileLayers */
function tileCollisionTest(pos, size=vec2(), callbackObject, solidOnly=true)
{
for (const layer of tileCollisionLayers)
{
if (!solidOnly || layer.isSolid)
if (layer.collisionTest(pos, size, callbackObject))
return layer;
}
}
/**
* @callback TileCollisionCallback - Function to handle a tile collision test
* @param {number} tileData - the value of the tile at the position
* @param {Vector2} pos - world space position of tile where the collision occurred
* @memberof TileLayers
*/
/** Return the exact position of the boundary of first tile hit, undefined if nothing was hit.
* The point will be inside the colliding tile if it hits
* @param {Vector2} posStart
* @param {Vector2} posEnd
* @param {EngineObject|TileCollisionCallback} [callbackObject] - Callback, engine object, or undefined
* @param {Vector2} [normal] - Optional normal of the surface hit
* @param {boolean} [solidOnly=true] - Only check solid layers?
* @return {Vector2|undefined} - position of the center of the tile hit or undefined if no hit
* @memberof TileLayers */
function tileCollisionRaycast(posStart, posEnd, callbackObject, normal, solidOnly=true)
{
for (const layer of tileCollisionLayers)
{
if (!solidOnly || layer.isSolid)
{
const hitPos = layer.collisionRaycast(posStart, posEnd, callbackObject, normal)
if (hitPos) return hitPos;
}
}
}
///////////////////////////////////////////////////////////////////////////////
/**
* Load tile layers from exported data
* @param {Object} tileMapData - Level data from exported data
* @param {TileInfo} [tileInfo] - Default tile info (used for size and texture)
* @param {number} [renderOrder] - Render order of the top layer
* @param {number} [collisionLayer] - Layer to use for collision if any
* @param {boolean} [draw] - Should the layer be drawn automatically
* @return {Array<TileCollisionLayer>}
* @memberof TileLayers */
function tileLayersLoad(tileMapData, tileInfo=tile(), renderOrder=0, collisionLayer, draw=true)
{
if (!tileMapData)
{
// default level data if loading failed
const s = 50;
tileMapData = {};
tileMapData.height = tileMapData.width = s;
tileMapData.layers = [{}];
tileMapData.layers[0].data = new Array(s*s).fill(0);
}
// validate the tile map data
ASSERT(tileMapData.width && tileMapData.height);
ASSERT(tileMapData.layers && tileMapData.layers.length);
// create tile layers and fill with data
const tileLayers = [];
const levelSize = vec2(tileMapData.width, tileMapData.height);
const layerCount = tileMapData.layers.length;
for (let layerIndex=layerCount; layerIndex--;)
{
const dataLayer = tileMapData.layers[layerIndex];
ASSERT(dataLayer.data && dataLayer.data.length);
ASSERT(levelSize.area() === dataLayer.data.length);
const layerRenderOrder = renderOrder - (layerCount - 1 - layerIndex);
const tileLayer = new TileCollisionLayer(vec2(), levelSize, tileInfo, layerRenderOrder);
tileLayers[layerIndex] = tileLayer;
// apply layer color
const layerColor = dataLayer.tintcolor ?
new Color().setHex(dataLayer.tintcolor) :
dataLayer.color || WHITE;
ASSERT(isColor(layerColor), 'layer color is not a color');
for (let x=levelSize.x; x--;)
for (let y=levelSize.y; y--;)
{
const pos = vec2(x, levelSize.y-1-y);
const data = dataLayer.data[x + y*levelSize.x];
if (data)
{
const layerData = new TileLayerData(data-1, 0, false, layerColor);
tileLayer.setData(pos, layerData);
// set collision for top layer
if (layerIndex === collisionLayer)
tileLayer.setCollisionData(pos, 1);
}
}
if (draw)
tileLayer.redraw();
}
return tileLayers;
}
///////////////////////////////////////////////////////////////////////////////
/**
* Tile layer data object stores info about how to draw a tile
* @memberof TileLayers
* @example
* // create tile layer data with tile index 0 and random orientation and color
* const tileIndex = 0;
* const direction = randInt(4)
* const mirror = randInt(2);
* const color = randColor();
* const data = new TileLayerData(tileIndex, direction, mirror, color);
*/
class TileLayerData
{
/** Create a tile layer data object, one for each tile in a TileLayer
* @param {number} [tile] - The tile to use, untextured if undefined
* @param {number} [direction] - Integer direction of tile, in 90 degree increments
* @param {boolean} [mirror] - If the tile should be mirrored along the x axis
* @param {Color} [color] - Color of the tile */
constructor(tile, direction=0, mirror=false, color=new Color)
{
/** @property {number} - The tile to use, untextured if undefined */
this.tile = tile;
/** @property {number} - Integer direction of tile, in 90 degree increments */
this.direction = direction;
/** @property {boolean} - If the tile should be mirrored along the x axis */
this.mirror = mirror;
/** @property {Color} - Color of the tile */
this.color = color.copy();
}
/** Set this tile to clear, it will not be rendered */
clear() { this.tile = this.direction = 0; this.mirror = false; this.color = new Color; }
}
///////////////////////////////////////////////////////////////////////////////
/**
* Canvas Layer - cached off screen rendering system
* - Contains an offscreen canvas that can be rendered to
* - WebGL rendering is optional, call updateWebGL to enable/update
* @extends EngineObject
* @memberof TileLayers
* @example
* const canvasLayer = new CanvasLayer(vec2(), vec2(200,100));
*/
class CanvasLayer extends EngineObject
{
/** Create a canvas layer object
* @param {Vector2} [pos] - World space position of the layer
* @param {Vector2} [size] - World space size of the layer
* @param {number} [angle] - Angle the layer is rotated by
* @param {number} [renderOrder] - Objects sorted by renderOrder
* @param {Vector2} [canvasSize] - Default size of canvas, can be changed later
* @param {boolean} [useWebGL] - Should this layer use WebGL for rendering
*/
constructor(pos, size, angle=0, renderOrder=0, canvasSize=vec2(512), useWebGL=true)
{
ASSERT(isVector2(canvasSize), 'canvasSize must be a Vector2');
super(pos, size, undefined, angle, WHITE, renderOrder);
/** @property {HTMLCanvasElement} - The canvas used by this layer */
this.canvas = headlessMode ? undefined : new OffscreenCanvas(canvasSize.x, canvasSize.y);
/** @property {OffscreenCanvasRenderingContext2D} - The 2D canvas context used by this layer */
this.context = this.canvas?.getContext('2d');
/** @property {TextureInfo} - Texture info to use for this object rendering */
this.textureInfo = new TextureInfo(this.canvas, useWebGL);
// disable physics by default
this.mass = 0;
}
/** Destroy this canvas layer */
destroy()
{
if (this.destroyed) return;
this.textureInfo.destroyWebGLTexture();
super.destroy();
}
// Render the layer, called automatically by the engine
render()
{
this.draw(this.pos, this.size, this.color, this.angle, this.mirror, this.additiveColor);
}
/** Draw this canvas layer centered in world space, with color applied if using WebGL
* @param {Vector2} pos - Center in world space
* @param {Vector2} [size] - Size in world space
* @param {Color} [color] - Color to modulate with
* @param {number} [angle] - Angle to rotate by
* @param {boolean} [mirror] - If true image is flipped along the Y axis
* @param {Color} [additiveColor] - Additive color to be applied if any
* @param {boolean} [screenSpace] - If true the pos and size are in screen space
* @param {CanvasRenderingContext2D|OffscreenCanvasRenderingContext2D} [context] - Canvas 2D context to draw to
* @memberof Draw */
draw(pos, size, color=WHITE, angle=0, mirror=false, additiveColor, screenSpace=false, context)
{
// draw the canvas layer as a single tile that uses the whole texture
const tileInfo = new TileInfo().setFullImage(this.textureInfo);
const useWebGL = this.hasWebGL();
drawTile(pos, size, tileInfo, color, angle, mirror, additiveColor, useWebGL, screenSpace, context);
}
/** Draw a tile onto the layer canvas in world space
* @param {Vector2} pos
* @param {Vector2} [size=vec2(1)]
* @param {TileInfo} [tileInfo]
* @param {Color} [color=WHITE]
* @param {number} [angle]
* @param {boolean} [mirror] */
drawTile(pos, size=vec2(1), tileInfo, color=new Color, angle=0, mirror=false)
{
pos = pos.subtract(this.pos).multiply(this.tileInfo.size);
size = size.multiply(this.tileInfo.size);
pos.y = this.canvas.height - pos.y;
// draw the tile onto the layer canvas
const oldMainCanvasSize = mainCanvasSize;
mainCanvasSize = vec2(this.canvas.width, this.canvas.height);
const useWebGL = this.hasWebGL();
useWebGL && glSetRenderTarget(this.textureInfo.glTexture);
const drawContext = useWebGL ? undefined : this.context;
drawTile(pos, size, tileInfo, color, angle, mirror, undefined, useWebGL, true, drawContext);
useWebGL && glSetRenderTarget();
mainCanvasSize = oldMainCanvasSize;
}
/** Draw a rectangle onto the layer canvas in world space
* @param {Vector2} pos
* @param {Vector2} [size=vec2(1)]
* @param {Color} [color=WHITE]
* @param {number} [angle] */
drawRect(pos, size, color, angle)
{ this.drawTile(pos, size, undefined, color, angle); }
/** Create WebGL texture if necessary and copy layer canvas to it */
updateWebGL()
{ this.textureInfo.createWebGLTexture(); }
/** Check if this layer is using WebGL
* @return {boolean} */
hasWebGL()
{ return glEnable && this.textureInfo.hasWebGL(); }
}
///////////////////////////////////////////////////////////////////////////////
/**
* Tile Layer - cached rendering system for tile layers
* - Each Tile layer is rendered to an off screen canvas
* - To allow dynamic modifications, layers are rendered using canvas 2d
* - Some devices like mobile phones are limited to 4k texture resolution
* - For with 16x16 tiles this limits layers to 256x256 on mobile devices
* - Tile layers are centered on their corner, so normal levels are at (0,0)
* @extends CanvasLayer
* @memberof TileLayers
* @example
* const tileLayer = new TileLayer(vec2(), vec2(200,100));
*/
class TileLayer extends CanvasLayer
{
/** Create a tile layer object
* @param {Vector2} pos - World space position
* @param {Vector2} size - World space size
* @param {TileInfo} [tileInfo] - Default tile info for layer (used for size and texture)
* @param {number} [renderOrder] - Objects are sorted by renderOrder
* @param {boolean} [useWebGL] - Should this layer use WebGL for rendering
*/
constructor(pos, size, tileInfo=tile(), renderOrder=0, useWebGL=true)
{
const canvasSize = tileInfo ? size.multiply(tileInfo.size) : size;
super(pos, size, 0, renderOrder, canvasSize, useWebGL);
/** @property {TileInfo} - Default tile info for layer */
this.tileInfo = undefined;
/** @property {Array<TileLayerData>} - Default tile info for layer */
this.data = [];
/** @property {boolean} - Is this layer using a webgl texture? */
this.isUsingWebGL = false;
if (headlessMode)
{
// disable rendering in headless mode
this.render = ()=> {};
this.redraw = ()=> {};
this.redrawStart = ()=> {};
this.redrawEnd = ()=> {};
this.drawTileData = ()=> {};
this.redrawTileData = ()=> {};
this.drawLayerTile = ()=> {};
this.drawLayerRect = ()=> {};
this.clearLayerRect = ()=> {};
return;
}
if (tileInfo)
{
// set tile info
this.tileInfo = tileInfo.frame(0);
this.tileInfo.bleed = 0; // disable bleed for tile layers
}
// init tile data
for (let j = this.size.area(); j--;)
this.data.push(new TileLayerData);
}
/** Set data at a given position in the array
* @param {Vector2} layerPos - Local position in array
* @param {TileLayerData} data - Data to set
* @param {boolean} [redraw] - Force the tile to redraw if true */
setData(layerPos, data, redraw=false)
{
layerPos = layerPos.floor();
ASSERT(isVector2(layerPos), 'layerPos must be a Vector2');
ASSERT(data instanceof TileLayerData, 'data must be a TileLayerData');
if (!layerPos.arrayCheck(this.size)) return;
this.data[(layerPos.y|0)*this.size.x+layerPos.x|0] = data;
if (!redraw) return;
const isRedraw = drawContext === this.context;
isRedraw ? this.drawTileData(layerPos) : this.redrawTileData(layerPos);
}
/** Clear data at a given position in the array
* @param {Vector2} layerPos - Local position in array
* @param {boolean} [redraw] - Force the tile to redraw if true */
clearData(layerPos, redraw=false)
{ this.setData(layerPos, new TileLayerData, redraw) }
/** Get data at a given position in the array
* @param {Vector2} layerPos - Local position in array
* @return {TileLayerData} */
getData(layerPos)
{
ASSERT(isVector2(layerPos), 'layerPos must be a Vector2');
return layerPos.arrayCheck(this.size) && this.data[(layerPos.y|0)*this.size.x+layerPos.x|0];
}
// Update the tile layer, refresh texture if needed
update()
{
if (!glEnable && this.isUsingWebGL)
{
// redraw the layer if webgl was disabled or context lost
this.isUsingWebGL = false;
this.redraw();
}
}
// Render the tile layer, called automatically by the engine
render()
{
ASSERT(drawContext !== this.context, 'must call redrawEnd() after drawing tiles!');
const size = this.drawSize || this.size;
const pos = this.pos.add(size.scale(.5));
this.draw(pos, this.size, this.color, this.angle, this.mirror, this.additiveColor);
}
/** Called after this layer is redrawn, does nothing by default */
onRedraw() {}
/** Draw all the tile data to an offscreen canvas
* - This may be slow if not using webgl but only needs to be done once */
redraw()
{
this.redrawStart(true);
for (let x = this.size.x; x--;)
for (let y = this.size.y; y--;)
this.drawTileData(vec2(x,y), false);
this.isUsingWebGL && glFlush();
this.onRedraw();
this.redrawEnd();
}
/** Call to start the redraw process
* - This can be used to manually update parts of the level
* @param {boolean} [clear] - Should it clear the canvas before drawing */
redrawStart(clear=false)
{
if (!this.context) return;
ASSERT(drawContext !== this.context);
// save current render settings
/** @type {[CanvasRenderingContext2D|OffscreenCanvasRenderingContext2D, Vector2, Vector2, number, Color]} */
this.savedRenderSettings = [drawContext, mainCanvasSize, cameraPos, cameraScale, canvasClearColor];
// set the draw canvas and context to this layer
// use camera settings to match this layer's canvas
drawContext = this.context;
const tileSize = this.tileInfo?.size ?? vec2(1);
mainCanvasSize = this.size.multiply(tileSize);
canvasClearColor = CLEAR_BLACK;
cameraPos = this.size.multiply(tileSize).scale(.5);
cameraScale = 1;
// set render target to this layer
this.isUsingWebGL = this.hasWebGL();
if (this.isUsingWebGL)
glSetRenderTarget(this.textureInfo.glTexture, clear);
else
{
// disable smoothing for pixel art
this.context.imageSmoothingEnabled = !tilesPixelated;
if (clear)
{
// clear and set size
this.canvas.width = mainCanvasSize.x;
this.canvas.height = mainCanvasSize.y;
}
}
}
/** Call to end the redraw process */
redrawEnd()
{
if (!this.context) return;
ASSERT(drawContext === this.context);
// set stuff back to normal
if (this.isUsingWebGL)
glSetRenderTarget();
[drawContext, mainCanvasSize, cameraPos, cameraScale, canvasClearColor] = this.savedRenderSettings;
}
/** Draw the tile at a given position in the tile layer
* This can be used to clear out tiles when they are destroyed
* Tiles can also be redrawn if inside a redrawStart/End block
* @param {Vector2} layerPos
* @param {boolean} [clear] - should the old tile be cleared out
*/
drawTileData(layerPos, clear=true)
{
if (!this.context) return;
ASSERT(drawContext === this.context, 'must call redrawStart() before drawing tiles');
// clear out where the tile was, can be skipped for fully opaque tiles
const drawSize = this.tileInfo?.size ?? vec2(1);
const drawPos = layerPos.multiply(drawSize);
clear && this.clearLayerRect(drawPos, drawSize);
// draw the tile if it has layer data
const d = this.getData(layerPos);
if (!d.tile) return;
const tileInfo = this.tileInfo && this.tileInfo.tile(d.tile);
this.drawLayerTile(drawPos, drawSize, tileInfo, d.color, d.direction*PI/2, d.mirror);
}
/** Draw the tile at a given position in the tile layer
* This can be used to clear tiles when they are destroyed
* For better performance use drawTileData inside a redrawStart/End block
* @param {Vector2} layerPos
* @param {boolean} [clear] - should the old tile be cleared
*/
redrawTileData(layerPos, clear=true)
{
if (!this.context) return;
ASSERT(drawContext !== this.context, 'redrawStart() should not be active when calling redrawTileData(), instead use drawTileData()');
this.redrawStart();
this.drawTileData(layerPos, clear);
this.redrawEnd();
}
/** Draw textured tile in layer space
* @param {Vector2} pos - Position in pixel coordinates
* @param {Vector2} [size=vec2(1)] - Size of the tile
* @param {TileInfo} [tileInfo] - Tile info to use, untextured if undefined
* @param {Color} [color=WHITE] - Color to modulate with
* @param {number} [angle] - Angle to rotate by
* @param {boolean} [mirror] - Is image flipped along the Y axis?
* @param {Color} [additiveColor] - Additive color to be applied if any */
drawLayerTile(pos, size=vec2(1), tileInfo, color=WHITE,
angle=0, mirror, additiveColor)
{
const drawPos = pos.add(size.scale(.5));
drawTile(drawPos, size, tileInfo, color, angle, mirror, additiveColor, this.isUsingWebGL);
}
/** Clear a rectangle in layer space
* @param {Vector2} pos
* @param {Vector2} size
* @param {Color} [color=WHITE] - Color to modulate with
* @param {number} [angle] - Angle to rotate by
*/
drawLayerRect(pos, size, color, angle=0)
{ this.drawLayerTile(pos, size, undefined, color, angle); }
/** Clear a rectangle in layer space
* @param {Vector2} pos - position in pixel coordinates
* @param {Vector2} size
*/
clearLayerRect(pos, size)
{
ASSERT(drawContext === this.context, 'must call redrawStart() before clearing tiles');
const x = pos.x, y = this.canvas.height - pos.y - size.y;
const useWebGL = this.hasWebGL();
if (useWebGL)
glClearRect(x, y, size.x, size.y);
else
this.context.clearRect(x, y, size.x, size.y);
}
}
///////////////////////////////////////////////////////////////////////////////
/**
* Tile Collision Layer - a tile layer with collision
* - adds collision data and functions to TileLayer
* - there can be multiple tile collision layers
* @extends TileLayer
* @memberof TileLayers
*/
class TileCollisionLayer extends TileLayer
{
/** Create a tile layer object
* @param {Vector2} pos - World space position
* @param {Vector2} size - World space size
* @param {TileInfo} [tileInfo] - Tile info for layer
* @param {number} [renderOrder] - Objects are sorted by renderOrder
* @param {boolean} [useWebGL] - Should this layer use WebGL for rendering
*/
constructor(pos, size, tileInfo=tile(), renderOrder=0, useWebGL=true)
{
super(pos, size.floor(), tileInfo, renderOrder, useWebGL);
/** @property {Array<number>} - The tile collision grid */
this.collisionData = [];
this.initCollision(this.size);
// keep track of all collision layers
tileCollisionLayers.push(this);
// tile collision layers are solid by default
this.isSolid = true;
}
/** Destroy this tile layer */
destroy()
{
if (this.destroyed) return;
// remove from collision layers array and destroy
const index = tileCollisionLayers.indexOf(this);
ASSERT(index >= 0, 'tile collision layer not found in array');
index >= 0 && tileCollisionLayers.splice(index, 1);
super.destroy();
}
/** Clear and initialize tile collision to new size
* @param {Vector2} size - width and height of tile collision 2d grid */
initCollision(size)
{
ASSERT(isVector2(size), 'size must be a Vector2');
this.size = size.floor();
this.collisionData = [];
this.collisionData.length = size.area();
this.collisionData.fill(0);
}
/** Set tile collision data for a given cell in the layer
* @param {Vector2} layerPos
* @param {number} [data] */
setCollisionData(layerPos, data=1)
{
ASSERT(isVector2(layerPos), 'layerPos must be a Vector2');
const i = (layerPos.y|0)*this.size.x + layerPos.x|0;
layerPos.arrayCheck(this.size) && (this.collisionData[i] = data);
}
/** Clear tile collision data for a given cell in the layer
* @param {Vector2} layerPos */
clearCollisionData(layerPos)
{ this.setCollisionData(layerPos, 0); }
/** Get tile collision data for a given cell in the layer
* @param {Vector2} layerPos
* @return {number} */
getCollisionData(layerPos)
{
ASSERT(isVector2(layerPos), 'layerPos must be a Vector2');
const i = (layerPos.y|0)*this.size.x + layerPos.x|0;
return layerPos.arrayCheck(this.size) ? this.collisionData[i] : 0;
}
/** Check if collision with another object should occur
* @param {Vector2} pos
* @param {Vector2} [size=vec2()]
* @param {EngineObject|TileCollisionCallback} [callbackObject] - Callback, engine object, or undefined
* @return {boolean} */
collisionTest(pos, size=new Vector2, callbackObject)
{
ASSERT(isVector2(pos) && isVector2(size), 'pos and size must be Vector2s');
ASSERT(!callbackObject || typeof callbackObject === 'function' || callbackObject instanceof EngineObject, 'callbackObject must be a function or EngineObject');
// make function to check for collision
const collisionTest = callbackObject ? typeof callbackObject === 'function' ?
(tileData, pos)=> callbackObject(tileData, pos) :
(tileData, pos)=> callbackObject.collideWithTile(tileData, pos) :
()=> true;
// check any tiles in the area for collision
const posX = pos.x - this.pos.x;
const posY = pos.y - this.pos.y;
const minX = max(posX - size.x/2|0, 0);
const minY = max(posY - size.y/2|0, 0);
const maxX = min(posX + size.x/2, this.size.x);
const maxY = min(posY + size.y/2, this.size.y);
const hitPos = new Vector2;
for (let y = minY; y < maxY; ++y)
for (let x = minX; x < maxX; ++x)
{
// check if the object should collide with this tile
const tileData = this.collisionData[y*this.size.x+x];
if (tileData && collisionTest(tileData, hitPos.set(x+this.pos.x, y+this.pos.y)))
return true;
}
return false;
}
/** Return the exact position of the boundary of first tile hit, undefined if nothing was hit.
* The point will be inside the colliding tile if it hits (may have a tiny shift)
* @param {Vector2} posStart
* @param {Vector2} posEnd
* @param {EngineObject|TileCollisionCallback} [callbackObject] - Callback, engine object, or undefined
* @param {Vector2} [normal] - Optional normal of the surface hit
* @return {Vector2|undefined} */
collisionRaycast(posStart, posEnd, callbackObject, normal)
{
ASSERT(isVector2(posStart) && isVector2(posEnd), 'positions must be Vector2s');
ASSERT(!callbackObject || typeof callbackObject === 'function' || callbackObject instanceof EngineObject, 'callbackObject must be a function or EngineObject');
// make function to check for collision
const collisionTest = callbackObject ? typeof callbackObject === 'function' ?
(tileData, pos)=> callbackObject(tileData, pos) :
(tileData, pos)=> callbackObject.collideWithTile(tileData, pos) :
(tileData)=> tileData > 0;
const testFunction = (pos)=>
{
const tileData = this.getCollisionData(localPos.set(pos.x - this.pos.x, pos.y - this.pos.y));
return tileData && collisionTest(tileData, pos);
}
// use line test against tile collision
const localPos = new Vector2;
const hitPos = lineTest(posStart, posEnd, testFunction, normal);
if (debugRaycast && hitPos)
{
const tilePos = hitPos.floor().add(vec2(.5));
debugRect(tilePos, vec2(1), '#f008');
debugLine(posStart, posEnd, '#00f', .02);
debugLine(posStart, hitPos, '#f00', .02);
debugPoint(hitPos, '#0f0');
normal && debugLine(hitPos, hitPos.add(normal), '#ff0', .02);
}
return hitPos;
}
}</code></pre></article></section><footer class="footer" id="PeOAagUepe"><div class="wrapper"><a href="https://github.com/KilledByAPixel/LittleJS">LittleJS - MIT License - Copyright 2021 Frank Force</a></div></footer></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type anything to view search result</span></div></div></div><div class="mobile-menu-icon-container"><button class="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><use xlink:href="#menu-icon"></use></svg></button></div><div 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