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<title>src/pixi/renderers/canvas/CanvasGraphics.js - Pixi.JS</title>
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<h1 class="file-heading">File: src/pixi/renderers/canvas/CanvasGraphics.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* A set of functions used by the canvas renderer to draw the primitive graphics data
* @class CanvasGraphics
*/
PIXI.CanvasGraphics = function()
{
}
/*
* @private
* @static
* @method renderGraphics
* @param graphics {Graphics}
* @param context {Context2D}
*/
PIXI.CanvasGraphics.renderGraphics = function(graphics, context)
{
var worldAlpha = graphics.worldAlpha;
for (var i=0; i < graphics.graphicsData.length; i++)
{
var data = graphics.graphicsData[i];
var points = data.points;
context.strokeStyle = color = '#' + ('00000' + ( data.lineColor | 0).toString(16)).substr(-6);
context.lineWidth = data.lineWidth;
if(data.type == PIXI.Graphics.POLY)
{
//if(data.lineWidth <= 0)continue;
context.beginPath();
context.moveTo(points[0], points[1]);
for (var j=1; j < points.length/2; j++)
{
context.lineTo(points[j * 2], points[j * 2 + 1]);
}
// if the first and last point are the same close the path - much neater :)
if(points[0] == points[points.length-2] && points[1] == points[points.length-1])
{
context.closePath();
}
if(data.fill)
{
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = color = '#' + ('00000' + ( data.fillColor | 0).toString(16)).substr(-6);
context.fill();
}
if(data.lineWidth)
{
context.globalAlpha = data.lineAlpha * worldAlpha;
context.stroke();
}
}
else if(data.type == PIXI.Graphics.RECT)
{
// TODO - need to be Undefined!
if(data.fillColor)
{
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = color = '#' + ('00000' + ( data.fillColor | 0).toString(16)).substr(-6);
context.rect(points[0], points[1], points[2], points[3]);
}
if(data.lineWidth)
{
context.globalAlpha = data.lineAlpha * worldAlpha;
context.strokeRect(points[0], points[1], points[2], points[3]);
}
}
else if(data.type == PIXI.Graphics.CIRC)
{
// TODO - need to be Undefined!
context.beginPath();
context.arc(points[0], points[1], points[2],0,2*Math.PI);
context.closePath();
if(data.fill)
{
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = color = '#' + ('00000' + ( data.fillColor | 0).toString(16)).substr(-6);
context.fill();
}
if(data.lineWidth)
{
context.globalAlpha = data.lineAlpha * worldAlpha;
context.stroke();
}
}
else if(data.type == PIXI.Graphics.ELIP)
{
// elipse code taken from: http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas
var elipseData = data.points;
var w = elipseData[2] * 2;
var h = elipseData[3] * 2;
var x = elipseData[0] - w/2;
var y = elipseData[1] - h/2;
context.beginPath();
var kappa = .5522848,
ox = (w / 2) * kappa, // control point offset horizontal
oy = (h / 2) * kappa, // control point offset vertical
xe = x + w, // x-end
ye = y + h, // y-end
xm = x + w / 2, // x-middle
ym = y + h / 2; // y-middle
context.moveTo(x, ym);
context.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
context.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
context.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
context.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
context.closePath();
if(data.fill)
{
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = color = '#' + ('00000' + ( data.fillColor | 0).toString(16)).substr(-6);
context.fill();
}
if(data.lineWidth)
{
context.globalAlpha = data.lineAlpha * worldAlpha;
context.stroke();
}
}
};
}
/*
* @private
* @static
* @method renderGraphicsMask
* @param graphics {Graphics}
* @param context {Context2D}
*/
PIXI.CanvasGraphics.renderGraphicsMask = function(graphics, context)
{
var worldAlpha = graphics.worldAlpha;
var len = graphics.graphicsData.length;
if(len > 1)
{
len = 1;
console.log("Pixi.js warning: masks in canvas can only mask using the first path in the graphics object")
}
for (var i=0; i < 1; i++)
{
var data = graphics.graphicsData[i];
var points = data.points;
if(data.type == PIXI.Graphics.POLY)
{
//if(data.lineWidth <= 0)continue;
context.beginPath();
context.moveTo(points[0], points[1]);
for (var j=1; j < points.length/2; j++)
{
context.lineTo(points[j * 2], points[j * 2 + 1]);
}
// if the first and last point are the same close the path - much neater :)
if(points[0] == points[points.length-2] && points[1] == points[points.length-1])
{
context.closePath();
}
}
else if(data.type == PIXI.Graphics.RECT)
{
context.beginPath();
context.rect(points[0], points[1], points[2], points[3]);
context.closePath();
}
else if(data.type == PIXI.Graphics.CIRC)
{
// TODO - need to be Undefined!
context.beginPath();
context.arc(points[0], points[1], points[2],0,2*Math.PI);
context.closePath();
}
else if(data.type == PIXI.Graphics.ELIP)
{
// elipse code taken from: http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas
var elipseData = data.points;
var w = elipseData[2] * 2;
var h = elipseData[3] * 2;
var x = elipseData[0] - w/2;
var y = elipseData[1] - h/2;
context.beginPath();
var kappa = .5522848,
ox = (w / 2) * kappa, // control point offset horizontal
oy = (h / 2) * kappa, // control point offset vertical
xe = x + w, // x-end
ye = y + h, // y-end
xm = x + w / 2, // x-middle
ym = y + h / 2; // y-middle
context.moveTo(x, ym);
context.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
context.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
context.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
context.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
context.closePath();
}
};
}
</pre>
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