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1167 lines
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1167 lines
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<a href="Phaser.Sprite.html">Sprite</a>
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<a href="Phaser.SpriteBatch.html">SpriteBatch</a>
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<a href="Phaser.Tilemap.html">Tilemap</a>
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<a href="Phaser.TilemapLayer.html">TilemapLayer</a>
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<a href="Phaser.TilemapParser.html">TilemapParser</a>
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<a href="Phaser.Tileset.html">Tileset</a>
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<a href="Phaser.TileSprite.html">TileSprite</a>
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<a href="Phaser.Time.html">Time</a>
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<a href="Phaser.Timer.html">Timer</a>
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<a href="Phaser.TimerEvent.html">TimerEvent</a>
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<a href="Phaser.Touch.html">Touch</a>
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<a href="Phaser.Utils.html">Utils</a>
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<div id="main">
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<h1 class="page-title">Source: d:/wamp/www/phaser/src/pixi/utils/Polyk.js</h1>
|
|
|
|
<section>
|
|
<article>
|
|
<pre class="sunlight-highlight-javascript linenums">/*
|
|
PolyK library
|
|
url: http://polyk.ivank.net
|
|
Released under MIT licence.
|
|
|
|
Copyright (c) 2012 Ivan Kuckir
|
|
|
|
Permission is hereby granted, free of charge, to any person
|
|
obtaining a copy of this software and associated documentation
|
|
files (the "Software"), to deal in the Software without
|
|
restriction, including without limitation the rights to use,
|
|
copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the
|
|
Software is furnished to do so, subject to the following
|
|
conditions:
|
|
|
|
The above copyright notice and this permission notice shall be
|
|
included in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
|
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
|
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
|
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|
OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
This is an amazing lib!
|
|
|
|
Slightly modified by Mat Groves (matgroves.com);
|
|
*/
|
|
|
|
/**
|
|
* Based on the Polyk library http://polyk.ivank.net released under MIT licence.
|
|
* This is an amazing lib!
|
|
* Slightly modified by Mat Groves (matgroves.com);
|
|
* @class PolyK
|
|
*/
|
|
PIXI.PolyK = {};
|
|
|
|
/**
|
|
* Triangulates shapes for webGL graphic fills.
|
|
*
|
|
* @method Triangulate
|
|
*/
|
|
PIXI.PolyK.Triangulate = function(p)
|
|
{
|
|
var sign = true;
|
|
|
|
var n = p.length >> 1;
|
|
if(n < 3) return [];
|
|
|
|
var tgs = [];
|
|
var avl = [];
|
|
for(var i = 0; i < n; i++) avl.push(i);
|
|
|
|
i = 0;
|
|
var al = n;
|
|
while(al > 3)
|
|
{
|
|
var i0 = avl[(i+0)%al];
|
|
var i1 = avl[(i+1)%al];
|
|
var i2 = avl[(i+2)%al];
|
|
|
|
var ax = p[2*i0], ay = p[2*i0+1];
|
|
var bx = p[2*i1], by = p[2*i1+1];
|
|
var cx = p[2*i2], cy = p[2*i2+1];
|
|
|
|
var earFound = false;
|
|
if(PIXI.PolyK._convex(ax, ay, bx, by, cx, cy, sign))
|
|
{
|
|
earFound = true;
|
|
for(var j = 0; j < al; j++)
|
|
{
|
|
var vi = avl[j];
|
|
if(vi === i0 || vi === i1 || vi === i2) continue;
|
|
|
|
if(PIXI.PolyK._PointInTriangle(p[2*vi], p[2*vi+1], ax, ay, bx, by, cx, cy)) {
|
|
earFound = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(earFound)
|
|
{
|
|
tgs.push(i0, i1, i2);
|
|
avl.splice((i+1)%al, 1);
|
|
al--;
|
|
i = 0;
|
|
}
|
|
else if(i++ > 3*al)
|
|
{
|
|
// need to flip flip reverse it!
|
|
// reset!
|
|
if(sign)
|
|
{
|
|
tgs = [];
|
|
avl = [];
|
|
for(i = 0; i < n; i++) avl.push(i);
|
|
|
|
i = 0;
|
|
al = n;
|
|
|
|
sign = false;
|
|
}
|
|
else
|
|
{
|
|
// window.console.log("PIXI Warning: shape too complex to fill");
|
|
return null;
|
|
}
|
|
}
|
|
}
|
|
|
|
tgs.push(avl[0], avl[1], avl[2]);
|
|
return tgs;
|
|
};
|
|
|
|
/**
|
|
* Checks whether a point is within a triangle
|
|
*
|
|
* @method _PointInTriangle
|
|
* @param px {Number} x coordinate of the point to test
|
|
* @param py {Number} y coordinate of the point to test
|
|
* @param ax {Number} x coordinate of the a point of the triangle
|
|
* @param ay {Number} y coordinate of the a point of the triangle
|
|
* @param bx {Number} x coordinate of the b point of the triangle
|
|
* @param by {Number} y coordinate of the b point of the triangle
|
|
* @param cx {Number} x coordinate of the c point of the triangle
|
|
* @param cy {Number} y coordinate of the c point of the triangle
|
|
* @private
|
|
* @return {Boolean}
|
|
*/
|
|
PIXI.PolyK._PointInTriangle = function(px, py, ax, ay, bx, by, cx, cy)
|
|
{
|
|
var v0x = cx-ax;
|
|
var v0y = cy-ay;
|
|
var v1x = bx-ax;
|
|
var v1y = by-ay;
|
|
var v2x = px-ax;
|
|
var v2y = py-ay;
|
|
|
|
var dot00 = v0x*v0x+v0y*v0y;
|
|
var dot01 = v0x*v1x+v0y*v1y;
|
|
var dot02 = v0x*v2x+v0y*v2y;
|
|
var dot11 = v1x*v1x+v1y*v1y;
|
|
var dot12 = v1x*v2x+v1y*v2y;
|
|
|
|
var invDenom = 1 / (dot00 * dot11 - dot01 * dot01);
|
|
var u = (dot11 * dot02 - dot01 * dot12) * invDenom;
|
|
var v = (dot00 * dot12 - dot01 * dot02) * invDenom;
|
|
|
|
// Check if point is in triangle
|
|
return (u >= 0) && (v >= 0) && (u + v < 1);
|
|
};
|
|
|
|
/**
|
|
* Checks whether a shape is convex
|
|
*
|
|
* @method _convex
|
|
* @private
|
|
* @return {Boolean}
|
|
*/
|
|
PIXI.PolyK._convex = function(ax, ay, bx, by, cx, cy, sign)
|
|
{
|
|
return ((ay-by)*(cx-bx) + (bx-ax)*(cy-by) >= 0) === sign;
|
|
};
|
|
</pre>
|
|
</article>
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</section>
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Phaser Copyright © 2012-2014 Photon Storm Ltd.
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<span class="jsdoc-message">
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.3.0-dev</a>
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