var math = require('../math'),
Texture = require('../textures/Texture'),
Container = require('../display/Container'),
utils = require('../utils'),
CONST = require('../const'),
tempPoint = new math.Point();
/**
* The Sprite object is the base for all textured objects that are rendered to the screen
*
* A sprite can be created directly from an image like this:
*
* ```js
* var sprite = new PIXI.Sprite.fromImage('assets/image.png');
* ```
*
* @class
* @extends PIXI.Container
* @memberof PIXI
* @param texture {PIXI.Texture} The texture for this sprite
*/
function Sprite(texture)
{
Container.call(this);
/**
* The anchor sets the origin point of the texture.
* The default is 0,0 this means the texture's origin is the top left
* Setting the anchor to 0.5,0.5 means the texture's origin is centered
* Setting the anchor to 1,1 would mean the texture's origin point will be the bottom right corner
*
* @member {PIXI.Point}
*/
this.anchor = new math.Point();
/**
* The texture that the sprite is using
*
* @member {PIXI.Texture}
* @private
*/
this._texture = null;
/**
* The width of the sprite (this is initially set by the texture)
*
* @member {number}
* @private
*/
this._width = 0;
/**
* The height of the sprite (this is initially set by the texture)
*
* @member {number}
* @private
*/
this._height = 0;
/**
* The tint applied to the sprite. This is a hex value. A value of 0xFFFFFF will remove any tint effect.
*
* @member {number}
* @default 0xFFFFFF
*/
this.tint = 0xFFFFFF;
/**
* The blend mode to be applied to the sprite. Apply a value of `PIXI.BLEND_MODES.NORMAL` to reset the blend mode.
*
* @member {number}
* @default PIXI.BLEND_MODES.NORMAL
* @see PIXI.BLEND_MODES
*/
this.blendMode = CONST.BLEND_MODES.NORMAL;
/**
* The shader that will be used to render the sprite. Set to null to remove a current shader.
*
* @member {PIXI.AbstractFilter|PIXI.Shader}
*/
this.shader = null;
/**
* An internal cached value of the tint.
*
* @member {number}
* @default 0xFFFFFF
*/
this.cachedTint = 0xFFFFFF;
// call texture setter
this.texture = texture || Texture.EMPTY;
this.textureDirty = true;
this.vertexData = new Float32Array(8);
}
// constructor
Sprite.prototype = Object.create(Container.prototype);
Sprite.prototype.constructor = Sprite;
module.exports = Sprite;
Object.defineProperties(Sprite.prototype, {
/**
* The width of the sprite, setting this will actually modify the scale to achieve the value set
*
* @member {number}
* @memberof PIXI.Sprite#
*/
width: {
get: function ()
{
return Math.abs(this.scale.x) * this.texture.crop.width;
},
set: function (value)
{
var sign = utils.sign(this.scale.x) || 1;
this.scale.x = sign * value / this.texture.crop.width;
this._width = value;
}
},
/**
* The height of the sprite, setting this will actually modify the scale to achieve the value set
*
* @member {number}
* @memberof PIXI.Sprite#
*/
height: {
get: function ()
{
return Math.abs(this.scale.y) * this.texture.crop.height;
},
set: function (value)
{
var sign = utils.sign(this.scale.y) || 1;
this.scale.y = sign * value / this.texture.crop.height;
this._height = value;
}
},
/**
* The texture that the sprite is using
*
* @member {PIXI.Texture}
* @memberof PIXI.Sprite#
*/
texture: {
get: function ()
{
return this._texture;
},
set: function (value)
{
if (this._texture === value)
{
return;
}
this._texture = value;
this.cachedTint = 0xFFFFFF;
this.textureDirty = true;
if (value)
{
// wait for the texture to load
if (value.baseTexture.hasLoaded)
{
this._onTextureUpdate();
}
else
{
value.once('update', this._onTextureUpdate, this);
}
}
}
}
});
/**
* When the texture is updated, this event will fire to update the scale and frame
*
* @private
*/
Sprite.prototype._onTextureUpdate = function ()
{
this.textureDirty = true;
// so if _width is 0 then width was not set..
if (this._width)
{
this.scale.x = utils.sign(this.scale.x) * this._width / this.texture.crop.width;
}
if (this._height)
{
this.scale.y = utils.sign(this.scale.y) * this._height / this.texture.crop.height;
}
};
Sprite.prototype.caclulateVertices = function ()
{
var texture = this._texture,
wt = this.transform.worldTransform,
a = wt.a, b = wt.b, c = wt.c, d = wt.d, tx = wt.tx, ty = wt.ty,
vertexData = this.vertexData,
w0, w1, h0, h1,
trim = texture.trim,
crop = texture.crop;
if (trim)
{
// if the sprite is trimmed and is not a tilingsprite then we need to add the extra space before transforming the sprite coords..
w1 = trim.x - this.anchor.x * crop.width;
w0 = w1 + trim.width;
h1 = trim.y - this.anchor.y * crop.height;
h0 = h1 + trim.height;
}
else
{
w0 = (crop.width ) * (1-this.anchor.x);
w1 = (crop.width ) * -this.anchor.x;
h0 = crop.height * (1-this.anchor.y);
h1 = crop.height * -this.anchor.y;
}
// xy
vertexData[0] = a * w1 + c * h1 + tx;
vertexData[1] = d * h1 + b * w1 + ty;
// xy
vertexData[2] = a * w0 + c * h1 + tx;
vertexData[3] = d * h1 + b * w0 + ty;
// xy
vertexData[4] = a * w0 + c * h0 + tx;
vertexData[5] = d * h0 + b * w0 + ty;
// xy
vertexData[6] = a * w1 + c * h0 + tx;
vertexData[7] = d * h0 + b * w1 + ty;
};
/**
*
* Renders the object using the WebGL renderer
*
* @param renderer {PIXI.WebGLRenderer}
* @private
*/
Sprite.prototype._renderWebGL = function (renderer)
{
if(this.transform.updated || this.textureDirty)
{
this.textureDirty = false;
// set the vertex data
this.caclulateVertices();
}
renderer.setObjectRenderer(renderer.plugins.sprite);
renderer.plugins.sprite.render(this);
};
/**
* Renders the object using the Canvas renderer
*
* @param renderer {PIXI.CanvasRenderer} The renderer
* @private
*/
Sprite.prototype._renderCanvas = function (renderer)
{
renderer.plugins.sprite.render(this);
};
/**
* Returns the bounds of the Sprite as a rectangle. The bounds calculation takes the worldTransform into account.
*
* @return {PIXI.Rectangle} the framing rectangle
*/
Sprite.prototype.getBounds = function ()
{
//TODO lookinto caching..
if(!this._currentBounds)
{
// if(this.vertexDirty)
{
this.vertexDirty = false;
// set the vertex data
this.caclulateVertices();
}
var minX, maxX, minY, maxY,
w0, w1, h0, h1,
vertexData = this.vertexData;
var x1 = vertexData[0];
var y1 = vertexData[1];
var x2 = vertexData[2];
var y2 = vertexData[3];
var x3 = vertexData[4];
var y3 = vertexData[5];
var x4 = vertexData[6];
var y4 = vertexData[7];
minX = x1;
minX = x2 < minX ? x2 : minX;
minX = x3 < minX ? x3 : minX;
minX = x4 < minX ? x4 : minX;
minY = y1;
minY = y2 < minY ? y2 : minY;
minY = y3 < minY ? y3 : minY;
minY = y4 < minY ? y4 : minY;
maxX = x1;
maxX = x2 > maxX ? x2 : maxX;
maxX = x3 > maxX ? x3 : maxX;
maxX = x4 > maxX ? x4 : maxX;
maxY = y1;
maxY = y2 > maxY ? y2 : maxY;
maxY = y3 > maxY ? y3 : maxY;
maxY = y4 > maxY ? y4 : maxY;
// check for children
if(this.children.length)
{
var childBounds = this.containerGetBounds();
w0 = childBounds.x;
w1 = childBounds.x + childBounds.width;
h0 = childBounds.y;
h1 = childBounds.y + childBounds.height;
minX = (minX < w0) ? minX : w0;
minY = (minY < h0) ? minY : h0;
maxX = (maxX > w1) ? maxX : w1;
maxY = (maxY > h1) ? maxY : h1;
}
var bounds = this._bounds;
bounds.x = minX;
bounds.width = maxX - minX;
bounds.y = minY;
bounds.height = maxY - minY;
// store a reference so that if this function gets called again in the render cycle we do not have to recalculate
this._currentBounds = bounds;
}
return this._currentBounds;
};
/**
* Gets the local bounds of the sprite object.
*
*/
Sprite.prototype.getLocalBounds = function ()
{
this._bounds.x = -this._texture.crop.width * this.anchor.x;
this._bounds.y = -this._texture.crop.height * this.anchor.y;
this._bounds.width = this._texture.crop.width;
this._bounds.height = this._texture.crop.height;
return this._bounds;
};
/**
* Tests if a point is inside this sprite
*
* @param point {PIXI.Point} the point to test
* @return {boolean} the result of the test
*/
Sprite.prototype.containsPoint = function( point )
{
this.worldTransform.applyInverse(point, tempPoint);
var width = this._texture.crop.width;
var height = this._texture.crop.height;
var x1 = -width * this.anchor.x;
var y1;
if ( tempPoint.x > x1 && tempPoint.x < x1 + width )
{
y1 = -height * this.anchor.y;
if ( tempPoint.y > y1 && tempPoint.y < y1 + height )
{
return true;
}
}
return false;
};
/**
* Destroys this sprite and optionally its texture
*
* @param [destroyTexture=false] {boolean} Should it destroy the current texture of the sprite as well
* @param [destroyBaseTexture=false] {boolean} Should it destroy the base texture of the sprite as well
*/
Sprite.prototype.destroy = function (destroyTexture, destroyBaseTexture)
{
Container.prototype.destroy.call(this);
this.anchor = null;
if (destroyTexture)
{
this._texture.destroy(destroyBaseTexture);
}
this._texture = null;
this.shader = null;
};
// some helper functions..
/**
* Helper function that creates a new sprite based on the source you provide.
* The soucre can be - frame id, image url, video url, canvae element, video element, base texture
*
* @static
* @param source {}
* @return {PIXI.Texture} A Texture
*/
Sprite.from = function (source)
{
return new Sprite(Texture.from(source));
}
/**
* Helper function that creates a sprite that will contain a texture from the TextureCache based on the frameId
* The frame ids are created when a Texture packer file has been loaded
*
* @static
* @param frameId {string} The frame Id of the texture in the cache
* @param [crossorigin=(auto)] {boolean} if you want to specify the cross-origin parameter
* @param [scaleMode=PIXI.SCALE_MODES.DEFAULT] {number} if you want to specify the scale mode, see {@link PIXI.SCALE_MODES} for possible values
* @return {PIXI.Sprite} A new Sprite using a texture from the texture cache matching the frameId
*/
Sprite.fromFrame = function (frameId)
{
var texture = utils.TextureCache[frameId];
if (!texture)
{
throw new Error('The frameId "' + frameId + '" does not exist in the texture cache');
}
return new Sprite(texture);
};
/**
* Helper function that creates a sprite that will contain a texture based on an image url
* If the image is not in the texture cache it will be loaded
*
* @static
* @param imageId {string} The image url of the texture
* @return {PIXI.Sprite} A new Sprite using a texture from the texture cache matching the image id
*/
Sprite.fromImage = function (imageId, crossorigin, scaleMode)
{
return new Sprite(Texture.fromImage(imageId, crossorigin, scaleMode));
};
