phaser/docs/Tileset.js.html
2014-12-04 11:33:42 +00:00

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<h1 class="page-title">Source: D:/wamp/www/phaser/src/tilemap/Tileset.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/**
* @author Richard Davey &lt;rich@photonstorm.com>
* @copyright 2014 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* A Tile set is a combination of an image containing the tiles and collision data per tile.
*
* Tilesets are normally created automatically when Tiled data is loaded.
*
* @class Phaser.Tileset
* @constructor
* @param {string} name - The name of the tileset in the map data.
* @param {integer} firstgid - The first tile index this tileset contains.
* @param {integer} [width=32] - Width of each tile (in pixels).
* @param {integer} [height=32] - Height of each tile (in pixels).
* @param {integer} [margin=0] - The margin around all tiles in the sheet (in pixels).
* @param {integer} [spacing=0] - The spacing between each tile in the sheet (in pixels).
* @param {object} [properties={}] - Custom Tileset properties.
*/
Phaser.Tileset = function (name, firstgid, width, height, margin, spacing, properties) {
if (typeof width === 'undefined' || width &lt;= 0) { width = 32; }
if (typeof height === 'undefined' || height &lt;= 0) { height = 32; }
if (typeof margin === 'undefined') { margin = 0; }
if (typeof spacing === 'undefined') { spacing = 0; }
/**
* The name of the Tileset.
* @property {string} name
*/
this.name = name;
/**
* The Tiled firstgid value.
* This is the starting index of the first tile index this Tileset contains.
* @property {integer} firstgid
*/
this.firstgid = firstgid | 0;
/**
* The width of each tile (in pixels).
* @property {integer} tileWidth
* @readonly
*/
this.tileWidth = width | 0;
/**
* The height of each tile (in pixels).
* @property {integer} tileHeight
* @readonly
*/
this.tileHeight = height | 0;
/**
* The margin around the tiles in the sheet (in pixels).
* Use `setSpacing` to change.
* @property {integer} tileMarge
* @readonly
*/
// Modified internally
this.tileMargin = margin | 0;
/**
* The spacing between each tile in the sheet (in pixels).
* Use `setSpacing` to change.
* @property {integer} tileSpacing
* @readonly
*/
this.tileSpacing = spacing | 0;
/**
* Tileset-specific properties that are typically defined in the Tiled editor.
* @property {object} properties
*/
this.properties = properties || {};
/**
* The cached image that contains the individual tiles. Use {@link Phaser.Tileset.setImage setImage} to set.
* @property {?object} image
* @readonly
*/
// Modified internally
this.image = null;
/**
* The number of tile rows in the the tileset.
* @property {integer}
* @readonly
*/
// Modified internally
this.rows = 0;
/**
* The number of tile columns in the tileset.
* @property {integer} columns
* @readonly
*/
// Modified internally
this.columns = 0;
/**
* The total number of tiles in the tileset.
* @property {integer} total
* @readonly
*/
// Modified internally
this.total = 0;
/**
* The look-up table to specific tile image offsets.
* The coordinates are interlaced such that it is [x0, y0, x1, y1 .. xN, yN] and the tile with the index of firstgid is found at indices 0/1.
* @property {integer[]} drawCoords
* @private
*/
this.drawCoords = [];
};
Phaser.Tileset.prototype = {
/**
* Draws a tile from this Tileset at the given coordinates on the context.
*
* @method Phaser.Tileset#draw
* @public
* @param {CanvasRenderingContext2D} context - The context to draw the tile onto.
* @param {number} x - The x coordinate to draw to.
* @param {number} y - The y coordinate to draw to.
* @param {integer} index - The index of the tile within the set to draw.
*/
draw: function (context, x, y, index) {
// Correct the tile index for the set and bias for interlacing
var coordIndex = (index - this.firstgid) &lt;&lt; 1;
if (coordIndex >= 0 && (coordIndex + 1) &lt; this.drawCoords.length)
{
context.drawImage(
this.image,
this.drawCoords[coordIndex],
this.drawCoords[coordIndex + 1],
this.tileWidth,
this.tileHeight,
x,
y,
this.tileWidth,
this.tileHeight
);
}
},
/**
* Returns true if and only if this tileset contains the given tile index.
*
* @method Phaser.Tileset#containsTileIndex
* @public
* @return {boolean} True if this tileset contains the given index.
*/
containsTileIndex: function (tileIndex)
{
return (
tileIndex >= this.firstgid &&
tileIndex &lt; (this.firstgid + this.total)
);
},
/**
* Set the image associated with this Tileset and update the tile data.
*
* @method Phaser.Tileset#setImage
* @public
* @param {Image} image - The image that contains the tiles.
*/
setImage: function (image) {
this.image = image;
this.updateTileData(image.width, image.height);
},
/**
* Sets tile spacing and margins.
*
* @method Phaser.Tileset#setSpacing
* @public
* @param {integer} tileMargin - The margin around the tiles in the sheet (in pixels).
* @param {integer} tileSpacing - The spacing between the tiles in the sheet (in pixels).
*/
setSpacing: function (margin, spacing) {
this.tileMargin = margin | 0;
this.tileSpacing = spacing | 0;
if (this.image)
{
this.updateTileData(this.image.width, this.image.height);
}
},
/**
* Updates tile coordinates and tileset data.
*
* @method Phaser.Tileset#updateTileData
* @private
* @param {integer} imageWidth - The (expected) width of the image to slice.
* @param {integer} imageHeight - The (expected) height of the image to slice.
*/
updateTileData: function (imageWidth, imageHeight) {
// May be fractional values
var rowCount = (imageHeight - this.tileMargin) / (this.tileHeight + this.tileSpacing);
var colCount = (imageWidth - this.tileMargin) / (this.tileWidth + this.tileSpacing);
if (rowCount % 1 !== 0 || colCount % 1 !== 0)
{
console.warn("Phaser.Tileset - image tile area is not an even multiple of tile size");
}
// In Tiled a tileset image that is not an even multiple of the tile dimensions
// is truncated - hence the floor when calculating the rows/columns.
rowCount = Math.floor(rowCount);
colCount = Math.floor(colCount);
if ((this.rows && this.rows !== rowCount) || (this.columns && this.columns !== colCount))
{
console.warn("Phaser.Tileset - actual and expected number of tile rows and columns differ");
}
this.rows = rowCount;
this.columns = colCount;
this.total = rowCount * colCount;
this.drawCoords.length = 0;
var tx = this.tileMargin;
var ty = this.tileMargin;
for (var y = 0; y &lt; this.rows; y++)
{
for (var x = 0; x &lt; this.columns; x++)
{
this.drawCoords.push(tx);
this.drawCoords.push(ty);
tx += this.tileWidth + this.tileSpacing;
}
tx = this.tileMargin;
ty += this.tileHeight + this.tileSpacing;
}
}
};
Phaser.Tileset.prototype.constructor = Phaser.Tileset;
</pre>
</article>
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