
Fixed issue where alpha not being set correctly in canvas spriteBatch Fixed issue where previous stage events did not get removed correctly
358 lines
12 KiB
HTML
358 lines
12 KiB
HTML
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<h1 class="file-heading">File: src/pixi/utils/Polyk.js</h1>
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<pre class="code prettyprint linenums">
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/*
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PolyK library
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url: http://polyk.ivank.net
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Released under MIT licence.
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Copyright (c) 2012 Ivan Kuckir
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use,
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copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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This is an amazing lib!
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slightly modified by mat groves (matgroves.com);
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*/
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PIXI.PolyK = {};
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/**
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* Triangulates shapes for webGL graphic fills
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*
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* @method Triangulate
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* @namespace PolyK
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* @constructor
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*/
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PIXI.PolyK.Triangulate = function(p)
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{
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var sign = true;
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var n = p.length >> 1;
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if(n < 3) return [];
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var tgs = [];
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var avl = [];
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for(var i = 0; i < n; i++) avl.push(i);
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i = 0;
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var al = n;
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while(al > 3)
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{
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var i0 = avl[(i+0)%al];
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var i1 = avl[(i+1)%al];
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var i2 = avl[(i+2)%al];
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var ax = p[2*i0], ay = p[2*i0+1];
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var bx = p[2*i1], by = p[2*i1+1];
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var cx = p[2*i2], cy = p[2*i2+1];
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var earFound = false;
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if(PIXI.PolyK._convex(ax, ay, bx, by, cx, cy, sign))
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{
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earFound = true;
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for(var j = 0; j < al; j++)
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{
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var vi = avl[j];
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if(vi === i0 || vi === i1 || vi === i2) continue;
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if(PIXI.PolyK._PointInTriangle(p[2*vi], p[2*vi+1], ax, ay, bx, by, cx, cy)) {
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earFound = false;
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break;
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}
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}
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}
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if(earFound)
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{
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tgs.push(i0, i1, i2);
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avl.splice((i+1)%al, 1);
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al--;
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i = 0;
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}
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else if(i++ > 3*al)
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{
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// need to flip flip reverse it!
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// reset!
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if(sign)
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{
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tgs = [];
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avl = [];
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for(i = 0; i < n; i++) avl.push(i);
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i = 0;
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al = n;
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sign = false;
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}
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else
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{
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window.console.log("PIXI Warning: shape too complex to fill");
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return [];
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}
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}
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}
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tgs.push(avl[0], avl[1], avl[2]);
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return tgs;
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};
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/**
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* Checks if a point is within a triangle
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*
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* @class _PointInTriangle
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* @namespace PolyK
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* @private
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*/
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PIXI.PolyK._PointInTriangle = function(px, py, ax, ay, bx, by, cx, cy)
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{
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var v0x = cx-ax;
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var v0y = cy-ay;
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var v1x = bx-ax;
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var v1y = by-ay;
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var v2x = px-ax;
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var v2y = py-ay;
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var dot00 = v0x*v0x+v0y*v0y;
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var dot01 = v0x*v1x+v0y*v1y;
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var dot02 = v0x*v2x+v0y*v2y;
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var dot11 = v1x*v1x+v1y*v1y;
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var dot12 = v1x*v2x+v1y*v2y;
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var invDenom = 1 / (dot00 * dot11 - dot01 * dot01);
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var u = (dot11 * dot02 - dot01 * dot12) * invDenom;
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var v = (dot00 * dot12 - dot01 * dot02) * invDenom;
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// Check if point is in triangle
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return (u >= 0) && (v >= 0) && (u + v < 1);
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};
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/**
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* Checks if a shape is convex
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*
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* @class _convex
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* @namespace PolyK
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* @private
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*/
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PIXI.PolyK._convex = function(ax, ay, bx, by, cx, cy, sign)
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{
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return ((ay-by)*(cx-bx) + (bx-ax)*(cy-by) >= 0) === sign;
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};
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</pre>
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