TilemapLayer.getRayCastTiles will let you get all tiles that hit the given line for further processing.

Fixed Tilemap collision. Added new TILE_BIAS const to aid with fast/small sprites.

README.md

@@ -153,6 +153,7 @@ New features:
 * ArcadePhysics.Body has a new gravityScale property, which is a modifier multiplied against the world gravity value on a Body.
 * Line.coordinatesOnLine will return all coordinates on the line using Bresenhams line algorithm.
 * Line now has x, y, width, height, top, bottom, left and right properties, so you can effectively get its bounds.
+* TilemapLayer.getRayCastTiles will let you get all tiles that hit the given line for further processing.
 
 
 Updates:

examples/wip/line points.js

@@ -6,7 +6,7 @@ function create() {
 
 	var line = new Phaser.Line(100, 50, 10, 300);
 
-	var coords = line.coordinatesOnLine();
+	var coords = line.coordinatesOnLine(8);
 
 	var bmd = game.add.bitmapData(800, 600);
 	bmd.context.fillStyle = '#ffffff';

examples/wip/tilemap raycast.js

@@ -0,0 +1,127 @@
+
+var game = new Phaser.Game(800, 600, Phaser.CANVAS, 'phaser-example', { preload: preload, create: create, update: update, render: render });
+
+function preload() {
+
+    game.load.tilemap('map', 'assets/tilemaps/maps/collision_test.json', null, Phaser.Tilemap.TILED_JSON);
+    game.load.image('ground_1x1', 'assets/tilemaps/tiles/ground_1x1.png');
+    game.load.image('phaser', 'assets/sprites/phaser-dude.png');
+
+}
+
+var map;
+var layer;
+var cursors;
+var sprite;
+var line;
+var tileHits = [];
+var plotting = false;
+
+function create() {
+
+    line = new Phaser.Line();
+
+    map = game.add.tilemap('map');
+
+    map.addTilesetImage('ground_1x1');
+    
+    layer = map.createLayer('Tile Layer 1');
+
+    layer.resizeWorld();
+
+    map.setCollisionBetween(1, 12);
+
+    layer.debug = true;
+
+    sprite = game.add.sprite(260, 70, 'phaser');
+
+    game.physics.enable(sprite);
+
+    game.camera.follow(sprite);
+
+    cursors = game.input.keyboard.createCursorKeys();
+
+    var help = game.add.text(10, 10, 'Arrows to move, click and drag to cast a ray', { font: '16px Arial', fill: '#ffffff' });
+    help.fixedToCamera = true;
+
+    game.input.onDown.add(startLine, this);
+    game.input.onUp.add(raycast, this);
+
+}
+
+function startLine(pointer) {
+
+    if (tileHits.length > 0)
+    {
+        for (var i = 0; i < tileHits.length; i++)
+        {
+            tileHits[i].debug = false;
+        }
+
+        layer.dirty = true;
+    }
+
+    line.start.set(pointer.worldX, pointer.worldY);
+
+    plotting = true;
+
+}
+
+function raycast(pointer) {
+
+    line.end.set(pointer.worldX, pointer.worldY);
+
+    tileHits = layer.getRayCastTiles(line, 4, false, false);
+
+    if (tileHits.length > 0)
+    {
+        //  Just so we can visually see the tiles
+        for (var i = 0; i < tileHits.length; i++)
+        {
+            tileHits[i].debug = true;
+        }
+
+        layer.dirty = true;
+    }
+
+    plotting = false;
+    
+}
+
+function update() {
+
+    if (plotting)
+    {
+        line.end.set(game.input.activePointer.worldX, game.input.activePointer.worldY);
+    }
+
+    game.physics.arcade.collide(sprite, layer);
+
+    sprite.body.velocity.x = 0;
+    sprite.body.velocity.y = 0;
+
+    if (cursors.up.isDown)
+    {
+        sprite.body.velocity.y = -200;
+    }
+    else if (cursors.down.isDown)
+    {
+        sprite.body.velocity.y = 200;
+    }
+
+    if (cursors.left.isDown)
+    {
+        sprite.body.velocity.x = -200;
+    }
+    else if (cursors.right.isDown)
+    {
+        sprite.body.velocity.x = 200;
+    }
+
+}
+
+function render() {
+
+    game.debug.geom(line);
+
+}

src/geom/Line.js

@@ -131,11 +131,13 @@ Phaser.Line.prototype = {
     * The start and end points are rounded before this runs as the algorithm works on integers.
     *
     * @method Phaser.Line#coordinatesOnLine
+    * @param {number} [stepRate=1] - How many steps will we return? 1 = every coordinate on the line, 2 = every other coordinate, etc.
     * @param {array} [results] - The array to store the results in. If not provided a new one will be generated.
     * @return {array} An array of coordinates.
     */
-    coordinatesOnLine: function (results) {
+    coordinatesOnLine: function (stepRate, results) {
 
+        if (typeof stepRate === 'undefined') { stepRate = 1; }
         if (typeof results === 'undefined') { results = []; }
 
         var x1 = Math.round(this.start.x);
@@ -151,6 +153,8 @@ Phaser.Line.prototype = {
 
         results.push([x1, y1]);
 
+        var i = 1;
+
         while (!((x1 == x2) && (y1 == y2)))
         {
             var e2 = err << 1;
@@ -167,7 +171,13 @@ Phaser.Line.prototype = {
                 y1 += sy;
             }
 
-            results.push([x1, y1]);
+            if (i % stepRate === 0)
+            {
+                results.push([x1, y1]);
+            }
+
+            i++;
+
         }
 
         return results;

src/physics/arcade/World.js

@@ -44,6 +44,11 @@ Phaser.Physics.Arcade = function (game) {
     */
     this.OVERLAP_BIAS = 4;
 
+    /**
+    * @property {number} TILE_BIAS - A value added to the delta values during collision with tiles. Adjust this if you get tunnelling.
+    */
+    this.TILE_BIAS = 16;
+
     /**
     * @property {Phaser.QuadTree} quadTree - The world QuadTree.
     */
@@ -1052,7 +1057,7 @@ Phaser.Physics.Arcade.prototype = {
             {
                 ox = body.x - tile.right;
 
-                if (ox < -this.OVERLAP_BIAS)
+                if (ox < -this.TILE_BIAS)
                 {
                     ox = 0;
                 }
@@ -1065,7 +1070,7 @@ Phaser.Physics.Arcade.prototype = {
             {
                 ox = body.right - tile.left;
 
-                if (ox > this.OVERLAP_BIAS)
+                if (ox > this.TILE_BIAS)
                 {
                     ox = 0;
                 }
@@ -1101,7 +1106,7 @@ Phaser.Physics.Arcade.prototype = {
             {
                 oy = body.y - tile.bottom;
 
-                if (oy < -this.OVERLAP_BIAS)
+                if (oy < -this.TILE_BIAS)
                 {
                     oy = 0;
                 }
@@ -1114,7 +1119,7 @@ Phaser.Physics.Arcade.prototype = {
             {
                 oy = body.bottom - tile.top;
 
-                if (oy > this.OVERLAP_BIAS)
+                if (oy > this.TILE_BIAS)
                 {
                     oy = 0;
                 }

src/tilemap/Tile.js

@@ -144,6 +144,20 @@ Phaser.Tile = function (layer, index, x, y, width, height) {
 
 Phaser.Tile.prototype = {
 
+    /**
+    * Check if the given x and y world coordinates are within this Tile.
+    *
+    * @method Phaser.Tile#containsPoint
+    * @param {number} x - The x coordinate to test.
+    * @param {number} y - The y coordinate to test.
+    * @return {boolean} True if the coordinates are within this Tile, otherwise false.
+    */
+    containsPoint: function (x, y) {
+
+        return !(x < this.worldX || y < this.worldY || x > this.right || y > this.bottom);
+
+    },
+
     /**
     * Check for intersection with this tile.
     *

src/tilemap/TilemapLayer.js

@@ -151,6 +151,12 @@ Phaser.TilemapLayer = function (game, tilemap, index, width, height) {
     */
     this.dirty = true;
 
+    /**
+    * @property {number} rayStepRate - When ray-casting against tiles this is the number of steps it will jump. For larger tile sizes you can increase this to improve performance.
+    * @default
+    */
+    this.rayStepRate = 4;
+
     /**
     * @property {number} _cw - Local collision var.
     * @private 
@@ -457,17 +463,46 @@ Phaser.TilemapLayer.prototype.getTileXY = function (x, y, point) {
 /**
 * Gets all tiles that intersect with the given line.
 *
-* @method Phaser.TilemapLayer#getIntersectingTiles
+* @method Phaser.TilemapLayer#getRayCastTiles
 * @memberof Phaser.TilemapLayer
 * @param {Phaser.Line} line - The line used to determine which tiles to return.
+* @param {number} [stepRate] - How many steps through the ray will we check? If undefined or null it uses TilemapLayer.rayStepRate.
+* @param {boolean} [collides=false] - If true only return tiles that collide on one or more faces.
+* @param {boolean} [interestingFace=false] - If true only return tiles that have interesting faces.
 * @return {array<Phaser.Tile>} An array of Phaser.Tiles.
 */
-Phaser.TilemapLayer.prototype.getIntersectingTiles = function (line) {
+Phaser.TilemapLayer.prototype.getRayCastTiles = function (line, stepRate, collides, interestingFace) {
 
-    var tiles = this.getTiles(x, y, width, height, false);
+    if (typeof stepRate === 'undefined' || stepRate === null) { stepRate = this.rayStepRate; }
+    if (typeof collides === 'undefined') { collides = false; }
+    if (typeof interestingFace === 'undefined') { interestingFace = false; }
 
+    //  First get all tiles that touch the bounds of the line
+    var tiles = this.getTiles(line.x, line.y, line.width, line.height, collides, interestingFace);
 
-    return tiles;
+    if (tiles.length === 0)
+    {
+        return [];
+    }
+
+    //  Now we only want the tiles that intersect with the points on this line
+    var coords = line.coordinatesOnLine(stepRate);
+    var total = coords.length;
+    var results = [];
+
+    for (var i = 0; i < tiles.length; i++)
+    {
+        for (var t = 0; t < total; t++)
+        {
+            if (tiles[i].containsPoint(coords[t][0], coords[t][1]))
+            {
+                results.push(tiles[i]);
+                break;
+            }
+        }
+    }
+
+    return results;
 
 }
 
@@ -589,8 +624,6 @@ Phaser.TilemapLayer.prototype.render = function () {
 
     var tile;
     var set;
-    // var ox = 0;
-    // var oy = 0;
 
     if (this.debug)
     {
@@ -618,11 +651,11 @@ Phaser.TilemapLayer.prototype.render = function () {
 
                 set.draw(this.context, Math.floor(this._tx), Math.floor(this._ty), tile.index);
 
-                // if (tile.debug)
-                // {
-                //     this.context.fillStyle = 'rgba(0, 255, 0, 0.4)';
-                //     this.context.fillRect(Math.floor(this._tx), Math.floor(this._ty), this.map.tileWidth, this.map.tileHeight);
-                // }
+                if (tile.debug)
+                {
+                    this.context.fillStyle = 'rgba(0, 255, 0, 0.4)';
+                    this.context.fillRect(Math.floor(this._tx), Math.floor(this._ty), this.map.tileWidth, this.map.tileHeight);
+                }
             }
 
             this._tx += this.map.tileWidth;