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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()
{
};
/*
* Renders the graphics object
*
* @static
* @private
* @method renderGraphics
* @param graphics {Graphics} the actual graphics object to render
* @param context {CanvasRenderingContext2D} the 2d drawing method of the canvas
*/
PIXI.CanvasGraphics.renderGraphics = function(graphics, context)
{
var worldAlpha = graphics.worldAlpha;
var color = '';
for (var i = 0; i < graphics.graphicsData.length; i++)
{
var data = graphics.graphicsData[i];
var shape = data.shape;
context.strokeStyle = color = '#' + ('00000' + ( data.lineColor | 0).toString(16)).substr(-6);
context.lineWidth = data.lineWidth;
if(data.type === PIXI.Graphics.POLY)
{
context.beginPath();
var points = shape.points;
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(shape.closed)
{
context.lineTo(points[0], points[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)
{
if(data.fillColor || data.fillColor === 0)
{
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = color = '#' + ('00000' + ( data.fillColor | 0).toString(16)).substr(-6);
context.fillRect(shape.x, shape.y, shape.width, shape.height);
}
if(data.lineWidth)
{
context.globalAlpha = data.lineAlpha * worldAlpha;
context.strokeRect(shape.x, shape.y, shape.width, shape.height);
}
}
else if(data.type === PIXI.Graphics.CIRC)
{
// TODO - need to be Undefined!
context.beginPath();
context.arc(shape.x, shape.y, shape.radius,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)
{
// ellipse code taken from: http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas
var w = shape.width * 2;
var h = shape.height * 2;
var x = shape.x - w/2;
var y = shape.y - h/2;
context.beginPath();
var kappa = 0.5522848,
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();
}
}
/*
else if (data.type === PIXI.Graphics.RREC)
{
var rx = points[0];
var ry = points[1];
var width = points[2];
var height = points[3];
var radius = points[4];
var maxRadius = Math.min(width, height) / 2 | 0;
radius = radius > maxRadius ? maxRadius : radius;
context.beginPath();
context.moveTo(rx, ry + radius);
context.lineTo(rx, ry + height - radius);
context.quadraticCurveTo(rx, ry + height, rx + radius, ry + height);
context.lineTo(rx + width - radius, ry + height);
context.quadraticCurveTo(rx + width, ry + height, rx + width, ry + height - radius);
context.lineTo(rx + width, ry + radius);
context.quadraticCurveTo(rx + width, ry, rx + width - radius, ry);
context.lineTo(rx + radius, ry);
context.quadraticCurveTo(rx, ry, rx, ry + radius);
context.closePath();
if(data.fillColor || data.fillColor === 0)
{
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();
}
}
*/
}
};
/*
* Renders a graphics mask
*
* @static
* @private
* @method renderGraphicsMask
* @param graphics {Graphics} the graphics which will be used as a mask
* @param context {CanvasRenderingContext2D} the context 2d method of the canvas
*/
PIXI.CanvasGraphics.renderGraphicsMask = function(graphics, context)
{
var len = graphics.graphicsData.length;
if(len === 0) return;
if(len > 1)
{
len = 1;
window.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)
{
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)
{
// ellipse code taken from: http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas
var ellipseData = data.points;
var w = ellipseData[2] * 2;
var h = ellipseData[3] * 2;
var x = ellipseData[0] - w/2;
var y = ellipseData[1] - h/2;
context.beginPath();
var kappa = 0.5522848,
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();
}
else if (data.type === PIXI.Graphics.RREC)
{
var rx = points[0];
var ry = points[1];
var width = points[2];
var height = points[3];
var radius = points[4];
var maxRadius = Math.min(width, height) / 2 | 0;
radius = radius > maxRadius ? maxRadius : radius;
context.beginPath();
context.moveTo(rx, ry + radius);
context.lineTo(rx, ry + height - radius);
context.quadraticCurveTo(rx, ry + height, rx + radius, ry + height);
context.lineTo(rx + width - radius, ry + height);
context.quadraticCurveTo(rx + width, ry + height, rx + width, ry + height - radius);
context.lineTo(rx + width, ry + radius);
context.quadraticCurveTo(rx + width, ry, rx + width - radius, ry);
context.lineTo(rx + radius, ry);
context.quadraticCurveTo(rx, ry, rx, ry + radius);
context.closePath();
}
}
};
</pre>
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