phaser/docs/src_pixi_renderers_canvas_CanvasGraphics.js.html
2015-07-22 15:31:30 +01:00

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<h1 class="page-title">Source: src/pixi/renderers/canvas/CanvasGraphics.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript 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
* @static
*/
PIXI.CanvasGraphics = function()
{
};
/*
* Renders a PIXI.Graphics object to a canvas.
*
* @method renderGraphics
* @static
* @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;
if (graphics.dirty)
{
this.updateGraphicsTint(graphics);
graphics.dirty = false;
}
for (var i = 0; i &lt; graphics.graphicsData.length; i++)
{
var data = graphics.graphicsData[i];
var shape = data.shape;
var fillColor = data._fillTint;
var lineColor = data._lineTint;
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 &lt; 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] &amp;&amp; points[1] === points[points.length-1])
{
context.closePath();
}
if (data.fill)
{
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = '#' + ('00000' + ( fillColor | 0).toString(16)).substr(-6);
context.fill();
}
if (data.lineWidth)
{
context.globalAlpha = data.lineAlpha * worldAlpha;
context.strokeStyle = '#' + ('00000' + ( lineColor | 0).toString(16)).substr(-6);
context.stroke();
}
}
else if (data.type === PIXI.Graphics.RECT)
{
if (data.fillColor || data.fillColor === 0)
{
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = '#' + ('00000' + ( 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.strokeStyle = '#' + ('00000' + ( lineColor | 0).toString(16)).substr(-6);
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 = '#' + ('00000' + ( fillColor | 0).toString(16)).substr(-6);
context.fill();
}
if (data.lineWidth)
{
context.globalAlpha = data.lineAlpha * worldAlpha;
context.strokeStyle = '#' + ('00000' + ( lineColor | 0).toString(16)).substr(-6);
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 = '#' + ('00000' + ( fillColor | 0).toString(16)).substr(-6);
context.fill();
}
if (data.lineWidth)
{
context.globalAlpha = data.lineAlpha * worldAlpha;
context.strokeStyle = '#' + ('00000' + ( lineColor | 0).toString(16)).substr(-6);
context.stroke();
}
}
else if (data.type === PIXI.Graphics.RREC)
{
var rx = shape.x;
var ry = shape.y;
var width = shape.width;
var height = shape.height;
var radius = shape.radius;
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 = '#' + ('00000' + ( fillColor | 0).toString(16)).substr(-6);
context.fill();
}
if (data.lineWidth)
{
context.globalAlpha = data.lineAlpha * worldAlpha;
context.strokeStyle = '#' + ('00000' + ( lineColor | 0).toString(16)).substr(-6);
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;
}
context.beginPath();
for (var i = 0; i &lt; len; i++)
{
var data = graphics.graphicsData[i];
var shape = data.shape;
if (data.type === PIXI.Graphics.POLY)
{
var points = shape.points;
context.moveTo(points[0], points[1]);
for (var j=1; j &lt; 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] &amp;&amp; points[1] === points[points.length-1])
{
context.closePath();
}
}
else if (data.type === PIXI.Graphics.RECT)
{
context.rect(shape.x, shape.y, shape.width, shape.height);
context.closePath();
}
else if (data.type === PIXI.Graphics.CIRC)
{
// TODO - need to be Undefined!
context.arc(shape.x, shape.y, shape.radius, 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 w = shape.width * 2;
var h = shape.height * 2;
var x = shape.x - w/2;
var y = shape.y - h/2;
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 = shape.x;
var ry = shape.y;
var width = shape.width;
var height = shape.height;
var radius = shape.radius;
var maxRadius = Math.min(width, height) / 2 | 0;
radius = radius > maxRadius ? maxRadius : radius;
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();
}
}
};
PIXI.CanvasGraphics.updateGraphicsTint = function(graphics)
{
if (graphics.tint === 0xFFFFFF)
{
return;
}
var tintR = (graphics.tint >> 16 &amp; 0xFF) / 255;
var tintG = (graphics.tint >> 8 &amp; 0xFF) / 255;
var tintB = (graphics.tint &amp; 0xFF)/ 255;
for (var i = 0; i &lt; graphics.graphicsData.length; i++)
{
var data = graphics.graphicsData[i];
var fillColor = data.fillColor | 0;
var lineColor = data.lineColor | 0;
/*
var colorR = (fillColor >> 16 &amp; 0xFF) / 255;
var colorG = (fillColor >> 8 &amp; 0xFF) / 255;
var colorB = (fillColor &amp; 0xFF) / 255;
colorR *= tintR;
colorG *= tintG;
colorB *= tintB;
fillColor = ((colorR*255 &lt;&lt; 16) + (colorG*255 &lt;&lt; 8) + colorB*255);
colorR = (lineColor >> 16 &amp; 0xFF) / 255;
colorG = (lineColor >> 8 &amp; 0xFF) / 255;
colorB = (lineColor &amp; 0xFF) / 255;
colorR *= tintR;
colorG *= tintG;
colorB *= tintB;
lineColor = ((colorR*255 &lt;&lt; 16) + (colorG*255 &lt;&lt; 8) + colorB*255);
*/
data._fillTint = (((fillColor >> 16 &amp; 0xFF) / 255 * tintR*255 &lt;&lt; 16) + ((fillColor >> 8 &amp; 0xFF) / 255 * tintG*255 &lt;&lt; 8) + (fillColor &amp; 0xFF) / 255 * tintB*255);
data._lineTint = (((lineColor >> 16 &amp; 0xFF) / 255 * tintR*255 &lt;&lt; 16) + ((lineColor >> 8 &amp; 0xFF) / 255 * tintG*255 &lt;&lt; 8) + (lineColor &amp; 0xFF) / 255 * tintB*255);
}
};
</pre>
</article>
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