root / trunk / web / dojo / dojox / gfx / gradutils.js @ 13
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| 1 | 9 | andrej.cim | /*
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| 2 | Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
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| 3 | Available via Academic Free License >= 2.1 OR the modified BSD license.
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| 4 | see: http://dojotoolkit.org/license for details
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| 5 | */
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| 6 | |||
| 7 | |||
| 8 | if(!dojo._hasResource["dojox.gfx.gradutils"]){ |
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| 9 | dojo._hasResource["dojox.gfx.gradutils"]=true; |
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| 10 | dojo.provide("dojox.gfx.gradutils");
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| 11 | dojo.require("dojox.gfx.matrix");
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| 12 | (function(){
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| 13 | var d=dojo,m=dojox.gfx.matrix,C=d.Color;
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| 14 | function _1(o,c){ |
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| 15 | if(o<=0){ |
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| 16 | return c[0].color; |
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| 17 | } |
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| 18 | var _2=c.length;
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| 19 | if(o>=1){ |
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| 20 | return c[_2-1].color; |
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| 21 | } |
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| 22 | for(var i=0;i<_2;++i){ |
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| 23 | var _3=c[i];
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| 24 | if(_3.offset>=o){
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| 25 | if(i){
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| 26 | var _4=c[i-1]; |
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| 27 | return d.blendColors(new C(_4.color),new C(_3.color),(o-_4.offset)/(_3.offset-_4.offset)); |
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| 28 | } |
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| 29 | return _3.color;
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| 30 | } |
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| 31 | } |
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| 32 | return c[_2-1].color; |
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| 33 | }; |
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| 34 | dojox.gfx.gradutils.getColor=function(_5,pt){ |
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| 35 | var o;
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| 36 | if(_5){
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| 37 | switch(_5.type){
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| 38 | case "linear": |
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| 39 | var _6=Math.atan2(_5.y2-_5.y1,_5.x2-_5.x1),_7=m.rotate(-_6),_8=m.project(_5.x2-_5.x1,_5.y2-_5.y1),p=m.multiplyPoint(_8,pt),_9=m.multiplyPoint(_8,_5.x1,_5.y1),_a=m.multiplyPoint(_8,_5.x2,_5.y2),_b=m.multiplyPoint(_7,_a.x-_9.x,_a.y-_9.y).x,o=m.multiplyPoint(_7,p.x-_9.x,p.y-_9.y).x/_b;
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| 40 | break;
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| 41 | case "radial": |
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| 42 | var dx=pt.x-_5.cx,dy=pt.y-_5.cy,o=Math.sqrt(dx*dx+dy*dy)/_5.r;
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| 43 | break;
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| 44 | } |
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| 45 | return _1(o,_5.colors);
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| 46 | } |
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| 47 | return new C(_5||[0,0,0,0]); |
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| 48 | }; |
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| 49 | dojox.gfx.gradutils.reverse=function(_c){ |
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| 50 | if(_c){
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| 51 | switch(_c.type){
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| 52 | case "linear": |
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| 53 | case "radial": |
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| 54 | _c=dojo.delegate(_c); |
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| 55 | if(_c.colors){
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| 56 | var c=_c.colors,l=c.length,i=0,_d,n=_c.colors=new Array(c.length); |
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| 57 | for(;i<l;++i){
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| 58 | _d=c[i]; |
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| 59 | n[i]={offset:1-_d.offset,color:_d.color};
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| 60 | } |
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| 61 | n.sort(function(a,b){
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| 62 | return a.offset-b.offset;
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| 63 | }); |
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| 64 | } |
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| 65 | break;
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| 66 | } |
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| 67 | } |
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| 68 | return _c;
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| 69 | }; |
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| 70 | })(); |
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| 71 | } |