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<h1 class="file-heading">File: src/pixi/primitives/Graphics.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* The Graphics class contains a set of methods that you can use to create primitive shapes and lines.
* It is important to know that with the webGL renderer only simple polygons can be filled at this stage
* Complex polygons will not be filled. Heres an example of a complex polygon: http://www.goodboydigital.com/wp-content/uploads/2013/06/complexPolygon.png
*
* @class Graphics
* @extends DisplayObjectContainer
* @constructor
*/
PIXI.Graphics = function()
{
PIXI.DisplayObjectContainer.call( this );
this.renderable = true;
/**
* The alpha of the fill of this graphics object
*
* @property fillAlpha
* @type Number
*/
this.fillAlpha = 1;
/**
* The width of any lines drawn
*
* @property lineWidth
* @type Number
*/
this.lineWidth = 0;
/**
* The color of any lines drawn
*
* @property lineColor
* @type String
*/
this.lineColor = "black";
/**
* Graphics data
*
* @property graphicsData
* @type Array
* @private
*/
this.graphicsData = [];
/**
* The tint applied to the graphic shape. This is a hex value
*
* @property tint
* @type Number
* @default 0xFFFFFF
*/
this.tint = 0xFFFFFF;// * Math.random();
/**
* The blend mode to be applied to the graphic shape
*
* @property blendMode
* @type Number
* @default PIXI.blendModes.NORMAL;
*/
this.blendMode = PIXI.blendModes.NORMAL;
/**
* Current path
*
* @property currentPath
* @type Object
* @private
*/
this.currentPath = {points:[]};
/**
* Array containing some WebGL-related properties used by the WebGL renderer
*
* @property _webGL
* @type Array
* @private
*/
this._webGL = [];
/**
* Whether this shape is being used as a mask
*
* @property isMask
* @type isMask
*/
this.isMask = false;
/**
* The bounds of the graphic shape as rectangle object
*
* @property bounds
* @type Rectangle
*/
this.bounds = null;
/**
* the bounds' padding used for bounds calculation
*
* @property bounds
* @type Number
*/
this.boundsPadding = 10;
};
// constructor
PIXI.Graphics.prototype = Object.create( PIXI.DisplayObjectContainer.prototype );
PIXI.Graphics.prototype.constructor = PIXI.Graphics;
/**
* If cacheAsBitmap is true the graphics object will then be rendered as if it was a sprite.
* This is useful if your graphics element does not change often as it will speed up the rendering of the object
* It is also usful as the graphics object will always be antialiased because it will be rendered using canvas
* Not recommended if you are constanly redrawing the graphics element.
*
* @property cacheAsBitmap
* @default false
* @type Boolean
* @private
*/
Object.defineProperty(PIXI.Graphics.prototype, "cacheAsBitmap", {
get: function() {
return this._cacheAsBitmap;
},
set: function(value) {
this._cacheAsBitmap = value;
if(this._cacheAsBitmap)
{
this._generateCachedSprite();
}
else
{
this.destroyCachedSprite();
this.dirty = true;
}
}
});
/**
* Specifies the line style used for subsequent calls to Graphics methods such as the lineTo() method or the drawCircle() method.
*
* @method lineStyle
* @param lineWidth {Number} width of the line to draw, will update the object's stored style
* @param color {Number} color of the line to draw, will update the object's stored style
* @param alpha {Number} alpha of the line to draw, will update the object's stored style
*/
PIXI.Graphics.prototype.lineStyle = function(lineWidth, color, alpha)
{
if (!this.currentPath.points.length) this.graphicsData.pop();
this.lineWidth = lineWidth || 0;
this.lineColor = color || 0;
this.lineAlpha = (arguments.length < 3) ? 1 : alpha;
this.currentPath = {lineWidth:this.lineWidth, lineColor:this.lineColor, lineAlpha:this.lineAlpha,
fillColor:this.fillColor, fillAlpha:this.fillAlpha, fill:this.filling, points:[], type:PIXI.Graphics.POLY};
this.graphicsData.push(this.currentPath);
return this;
};
/**
* Moves the current drawing position to (x, y).
*
* @method moveTo
* @param x {Number} the X coordinate to move to
* @param y {Number} the Y coordinate to move to
*/
PIXI.Graphics.prototype.moveTo = function(x, y)
{
if (!this.currentPath.points.length) this.graphicsData.pop();
this.currentPath = this.currentPath = {lineWidth:this.lineWidth, lineColor:this.lineColor, lineAlpha:this.lineAlpha,
fillColor:this.fillColor, fillAlpha:this.fillAlpha, fill:this.filling, points:[], type:PIXI.Graphics.POLY};
this.currentPath.points.push(x, y);
this.graphicsData.push(this.currentPath);
return this;
};
/**
* Draws a line using the current line style from the current drawing position to (x, y);
* the current drawing position is then set to (x, y).
*
* @method lineTo
* @param x {Number} the X coordinate to draw to
* @param y {Number} the Y coordinate to draw to
*/
PIXI.Graphics.prototype.lineTo = function(x, y)
{
this.currentPath.points.push(x, y);
this.dirty = true;
return this;
};
/**
* Specifies a simple one-color fill that subsequent calls to other Graphics methods
* (such as lineTo() or drawCircle()) use when drawing.
*
* @method beginFill
* @param color {Number} the color of the fill
* @param alpha {Number} the alpha of the fill
*/
PIXI.Graphics.prototype.beginFill = function(color, alpha)
{
this.filling = true;
this.fillColor = color || 0;
this.fillAlpha = (arguments.length < 2) ? 1 : alpha;
return this;
};
/**
* Applies a fill to the lines and shapes that were added since the last call to the beginFill() method.
*
* @method endFill
*/
PIXI.Graphics.prototype.endFill = function()
{
this.filling = false;
this.fillColor = null;
this.fillAlpha = 1;
return this;
};
/**
* @method drawRect
*
* @param x {Number} The X coord of the top-left of the rectangle
* @param y {Number} The Y coord of the top-left of the rectangle
* @param width {Number} The width of the rectangle
* @param height {Number} The height of the rectangle
*/
PIXI.Graphics.prototype.drawRect = function( x, y, width, height )
{
if (!this.currentPath.points.length) this.graphicsData.pop();
this.currentPath = {lineWidth:this.lineWidth, lineColor:this.lineColor, lineAlpha:this.lineAlpha,
fillColor:this.fillColor, fillAlpha:this.fillAlpha, fill:this.filling,
points:[x, y, width, height], type:PIXI.Graphics.RECT};
this.graphicsData.push(this.currentPath);
this.dirty = true;
return this;
};
/**
* Draws a circle.
*
* @method drawCircle
* @param x {Number} The X coordinate of the center of the circle
* @param y {Number} The Y coordinate of the center of the circle
* @param radius {Number} The radius of the circle
*/
PIXI.Graphics.prototype.drawCircle = function( x, y, radius)
{
if (!this.currentPath.points.length) this.graphicsData.pop();
this.currentPath = {lineWidth:this.lineWidth, lineColor:this.lineColor, lineAlpha:this.lineAlpha,
fillColor:this.fillColor, fillAlpha:this.fillAlpha, fill:this.filling,
points:[x, y, radius, radius], type:PIXI.Graphics.CIRC};
this.graphicsData.push(this.currentPath);
this.dirty = true;
return this;
};
/**
* Draws an ellipse.
*
* @method drawEllipse
* @param x {Number} The X coordinate of the upper-left corner of the framing rectangle of this ellipse
* @param y {Number} The Y coordinate of the upper-left corner of the framing rectangle of this ellipse
* @param width {Number} The width of the ellipse
* @param height {Number} The height of the ellipse
*/
PIXI.Graphics.prototype.drawEllipse = function( x, y, width, height)
{
if (!this.currentPath.points.length) this.graphicsData.pop();
this.currentPath = {lineWidth:this.lineWidth, lineColor:this.lineColor, lineAlpha:this.lineAlpha,
fillColor:this.fillColor, fillAlpha:this.fillAlpha, fill:this.filling,
points:[x, y, width, height], type:PIXI.Graphics.ELIP};
this.graphicsData.push(this.currentPath);
this.dirty = true;
return this;
};
/**
* Clears the graphics that were drawn to this Graphics object, and resets fill and line style settings.
*
* @method clear
*/
PIXI.Graphics.prototype.clear = function()
{
this.lineWidth = 0;
this.filling = false;
this.dirty = true;
this.clearDirty = true;
this.graphicsData = [];
this.bounds = null; //new PIXI.Rectangle();
return this;
};
/**
* Useful function that returns a texture of the graphics object that can then be used to create sprites
* This can be quite useful if your geometry is complicated and needs to be reused multiple times.
*
* @method generateTexture
* @return {Texture} a texture of the graphics object
*/
PIXI.Graphics.prototype.generateTexture = function()
{
var bounds = this.getBounds();
var canvasBuffer = new PIXI.CanvasBuffer(bounds.width, bounds.height);
var texture = PIXI.Texture.fromCanvas(canvasBuffer.canvas);
canvasBuffer.context.translate(-bounds.x,-bounds.y);
PIXI.CanvasGraphics.renderGraphics(this, canvasBuffer.context);
return texture;
};
/**
* Renders the object using the WebGL renderer
*
* @method _renderWebGL
* @param renderSession {RenderSession}
* @private
*/
PIXI.Graphics.prototype._renderWebGL = function(renderSession)
{
// if the sprite is not visible or the alpha is 0 then no need to render this element
if(this.visible === false || this.alpha === 0 || this.isMask === true)return;
if(this._cacheAsBitmap)
{
if(this.dirty)
{
this._generateCachedSprite();
// we will also need to update the texture on the gpu too!
PIXI.updateWebGLTexture(this._cachedSprite.texture.baseTexture, renderSession.gl);
this.dirty = false;
}
this._cachedSprite.alpha = this.alpha;
PIXI.Sprite.prototype._renderWebGL.call(this._cachedSprite, renderSession);
return;
}
else
{
renderSession.spriteBatch.stop();
if(this._mask)renderSession.maskManager.pushMask(this.mask, renderSession);
if(this._filters)renderSession.filterManager.pushFilter(this._filterBlock);
// check blend mode
if(this.blendMode !== renderSession.spriteBatch.currentBlendMode)
{
renderSession.spriteBatch.currentBlendMode = this.blendMode;
var blendModeWebGL = PIXI.blendModesWebGL[renderSession.spriteBatch.currentBlendMode];
renderSession.spriteBatch.gl.blendFunc(blendModeWebGL[0], blendModeWebGL[1]);
}
PIXI.WebGLGraphics.renderGraphics(this, renderSession);
// only render if it has children!
if(this.children.length)
{
renderSession.spriteBatch.start();
// simple render children!
for(var i=0, j=this.children.length; i<j; i++)
{
this.children[i]._renderWebGL(renderSession);
}
renderSession.spriteBatch.stop();
}
if(this._filters)renderSession.filterManager.popFilter();
if(this._mask)renderSession.maskManager.popMask(renderSession);
renderSession.drawCount++;
renderSession.spriteBatch.start();
}
};
/**
* Renders the object using the Canvas renderer
*
* @method _renderCanvas
* @param renderSession {RenderSession}
* @private
*/
PIXI.Graphics.prototype._renderCanvas = function(renderSession)
{
// if the sprite is not visible or the alpha is 0 then no need to render this element
if(this.visible === false || this.alpha === 0 || this.isMask === true)return;
var context = renderSession.context;
var transform = this.worldTransform;
if(this.blendMode !== renderSession.currentBlendMode)
{
renderSession.currentBlendMode = this.blendMode;
context.globalCompositeOperation = PIXI.blendModesCanvas[renderSession.currentBlendMode];
}
context.setTransform(transform.a, transform.c, transform.b, transform.d, transform.tx, transform.ty);
PIXI.CanvasGraphics.renderGraphics(this, context);
// simple render children!
for(var i=0, j=this.children.length; i<j; i++)
{
this.children[i]._renderCanvas(renderSession);
}
};
/**
* Retrieves the bounds of the graphic shape as a rectangle object
*
* @method getBounds
* @return {Rectangle} the rectangular bounding area
*/
PIXI.Graphics.prototype.getBounds = function( matrix )
{
if(!this.bounds)this.updateBounds();
var w0 = this.bounds.x;
var w1 = this.bounds.width + this.bounds.x;
var h0 = this.bounds.y;
var h1 = this.bounds.height + this.bounds.y;
var worldTransform = matrix || this.worldTransform;
var a = worldTransform.a;
var b = worldTransform.c;
var c = worldTransform.b;
var d = worldTransform.d;
var tx = worldTransform.tx;
var ty = worldTransform.ty;
var x1 = a * w1 + c * h1 + tx;
var y1 = d * h1 + b * w1 + ty;
var x2 = a * w0 + c * h1 + tx;
var y2 = d * h1 + b * w0 + ty;
var x3 = a * w0 + c * h0 + tx;
var y3 = d * h0 + b * w0 + ty;
var x4 = a * w1 + c * h0 + tx;
var y4 = d * h0 + b * w1 + ty;
var maxX = -Infinity;
var maxY = -Infinity;
var minX = Infinity;
var minY = Infinity;
minX = x1 < minX ? x1 : minX;
minX = x2 < minX ? x2 : minX;
minX = x3 < minX ? x3 : minX;
minX = x4 < minX ? x4 : minX;
minY = y1 < minY ? y1 : minY;
minY = y2 < minY ? y2 : minY;
minY = y3 < minY ? y3 : minY;
minY = y4 < minY ? y4 : minY;
maxX = x1 > maxX ? x1 : maxX;
maxX = x2 > maxX ? x2 : maxX;
maxX = x3 > maxX ? x3 : maxX;
maxX = x4 > maxX ? x4 : maxX;
maxY = y1 > maxY ? y1 : maxY;
maxY = y2 > maxY ? y2 : maxY;
maxY = y3 > maxY ? y3 : maxY;
maxY = y4 > maxY ? y4 : maxY;
var bounds = this._bounds;
bounds.x = minX;
bounds.width = maxX - minX;
bounds.y = minY;
bounds.height = maxY - minY;
return bounds;
};
/**
* Update the bounds of the object
*
* @method updateBounds
*/
PIXI.Graphics.prototype.updateBounds = function()
{
var minX = Infinity;
var maxX = -Infinity;
var minY = Infinity;
var maxY = -Infinity;
var points, x, y, w, h;
for (var i = 0; i < this.graphicsData.length; i++) {
var data = this.graphicsData[i];
var type = data.type;
var lineWidth = data.lineWidth;
points = data.points;
if(type === PIXI.Graphics.RECT)
{
x = points[0] - lineWidth/2;
y = points[1] - lineWidth/2;
w = points[2] + lineWidth;
h = points[3] + lineWidth;
minX = x < minX ? x : minX;
maxX = x + w > maxX ? x + w : maxX;
minY = y < minY ? x : minY;
maxY = y + h > maxY ? y + h : maxY;
}
else if(type === PIXI.Graphics.CIRC || type === PIXI.Graphics.ELIP)
{
x = points[0];
y = points[1];
w = points[2] + lineWidth/2;
h = points[3] + lineWidth/2;
minX = x - w < minX ? x - w : minX;
maxX = x + w > maxX ? x + w : maxX;
minY = y - h < minY ? y - h : minY;
maxY = y + h > maxY ? y + h : maxY;
}
else
{
// POLY
for (var j = 0; j < points.length; j+=2)
{
x = points[j];
y = points[j+1];
minX = x-lineWidth < minX ? x-lineWidth : minX;
maxX = x+lineWidth > maxX ? x+lineWidth : maxX;
minY = y-lineWidth < minY ? y-lineWidth : minY;
maxY = y+lineWidth > maxY ? y+lineWidth : maxY;
}
}
}
var padding = this.boundsPadding;
this.bounds = new PIXI.Rectangle(minX - padding, minY - padding, (maxX - minX) + padding * 2, (maxY - minY) + padding * 2);
};
/**
* Generates the cached sprite when the sprite has cacheAsBitmap = true
*
* @method _generateCachedSprite
* @private
*/
PIXI.Graphics.prototype._generateCachedSprite = function()
{
var bounds = this.getLocalBounds();
if(!this._cachedSprite)
{
var canvasBuffer = new PIXI.CanvasBuffer(bounds.width, bounds.height);
var texture = PIXI.Texture.fromCanvas(canvasBuffer.canvas);
this._cachedSprite = new PIXI.Sprite(texture);
this._cachedSprite.buffer = canvasBuffer;
this._cachedSprite.worldTransform = this.worldTransform;
}
else
{
this._cachedSprite.buffer.resize(bounds.width, bounds.height);
}
// leverage the anchor to account for the offset of the element
this._cachedSprite.anchor.x = -( bounds.x / bounds.width );
this._cachedSprite.anchor.y = -( bounds.y / bounds.height );
// this._cachedSprite.buffer.context.save();
this._cachedSprite.buffer.context.translate(-bounds.x,-bounds.y);
PIXI.CanvasGraphics.renderGraphics(this, this._cachedSprite.buffer.context);
this._cachedSprite.alpha = this.alpha;
// this._cachedSprite.buffer.context.restore();
};
PIXI.Graphics.prototype.destroyCachedSprite = function()
{
this._cachedSprite.texture.destroy(true);
// let the gc collect the unused sprite
// TODO could be object pooled!
this._cachedSprite = null;
};
// SOME TYPES:
PIXI.Graphics.POLY = 0;
PIXI.Graphics.RECT = 1;
PIXI.Graphics.CIRC = 2;
PIXI.Graphics.ELIP = 3;
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