canvas如何实现十二星座星空图

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效果如下：

canvas如何实现十二星座星空图

代码如下：




 
 canvas星座
 



 请选择您的出生日期

　你的浏览器不支持canvas var box=document.getElementById('box'); var birth=document.getElementById('birth'); var btn=document.getElementById('btn'); var canvas=document.getElementById("canvas"); var ctx=canvas.getContext("2d"); var g1,date,timer; ctx.font = "30px Courier New"; /*星座位置*/ var star={ "白羊座":[ [[0.30,0.78],[0.34,0.66],[0.28,0.48],[0.60,0.26],[0.65,0.20],[0.71,0.23],[0.70,0.32],[0.72,0.36]], [ [0,1,2,3,4,5],[3,6,7]] ], "天秤座":[ [[0.16,0.67],[0.34,0.60],[0.60,0.27],[0.75,0.23],[0.84,0.47],[0.63,0.74],[0.51,0.78]], [[0,1,2,3,4,5,6]] ], "摩羯座":[ [[0.78,0.21],[0.78,0.34],[0.75,0.45],[0.75,0.70],[0.69,0.78],[0.31,0.66],[0.22,0.49],[0.30,0.53],[0.53,0.54]], [[0,1,2,3,4,5,6,7,8,1]] ], "水瓶座":[ [[0.45,0.21],[0.37,0.35],[0.27,0.51],[0.30,0.58],[0.29,0.64],[0.48,0.79],[0.51,0.71],[0.58,0.68],[0.73,0.74],[0.43,0.53],[0.53,0.47]], [[0,1,2,3,4,5,6,7,8],[2,9,10]] ], "双鱼座":[ [[0.28,0.43],[0.28,0.53],[0.36,0.73],[0.43,0.78],[0.50,0.70],[0.53,0.62],[0.57,0.58],[0.63,0.43],[0.67,0.39],[0.74,0.39],[0.77,0.34],[0.72,0.30],[0.75,0.22],[0.23,0.50],[0.66,0.33]], [[0,1,2,3,4,5,6,7,8,9,10,11,12],[0,13,1],[8,14,11]] ], "金牛座":[ [[0.29,0.21],[0.39,0.36],[0.50,0.51],[0.50,0.57],[0.61,0.63],[0.77,0.71],[0.79,0.79],[0.22,0.43],[0.39,0.57],[0.60,0.71],[0.67,0.76]], [[0,1,2,3,4,5,6],[7,8,3],[4,9,10]] ], "双子座":[ [[0.18,0.37],[0.25,0.45],[0.35,0.55],[0.39,0.68],[0.49,0.77],[0.51,0.63],[0.57,0.78],[0.28,0.29],[0.42,0.32],[0.61,0.49],[0.72,0.60],[0.83,0.59],[0.69,0.75],[0.22,0.54],[0.35,0.43],[0.48,0.21]], [[0,1,2,3,4],[2,5,6],[7,8,9,10,11],[9,12],[13,1,14,8,15]] ], "巨蟹座":[ [ [0.16,0.39],[0.27,0.36],[0.52,0.49],[0.57,0.65],[0.83,0.78],[0.44,0.21]], [[0,1,2,3,4],[2,5]] ], "狮子座":[ [ [0.16,0.75],[0.23,0.67],[0.39,0.77],[0.71,0.53],[0.64,0.39],[0.55,0.37],[0.47,0.27],[0.54,0.24],[0.60,0.27],[0.85,0.56]], [[0,1,2,3,4,5,6,7,8],[3,9]] ], "处女座":[ [[0.16,0.59],[0.35,0.63],[0.44,0.70],[0.62,0.51],[0.77,0.46],[0.84,0.37],[0.60,0.42],[0.65,0.26],[0.34,0.75]], [[0,1,2,3,4,5],[3,6,7],[2,8]] ], "天蝎座":[ [[0.17,0.50],[0.28,0.63],[0.19,0.70],[0.28,0.78],[0.41,0.77],[0.49,0.72],[0.57,0.55],[0.59,0.44],[0.69,0.31],[0.74,0.21],[0.82,0.29],[0.79,0.44],[0.73,0.50],[0.38,0.47]], [[0,1,2,3,4,5,6,7,8,9,10,11,12],[1,13],[8,11]] ], "射手座":[ [[0.22, 0.66],[0.24,0.51],[0.45,0.40],[0.54,0.37],[0.59,0.43],[0.66,0.50],[0.63,0.60],[0.66,0.67],[0.74,0.53],[0.77,0.39],[0.49,0.47],[0.29,0.68],[0.30,0.78],[0.48,0.21],[0.52,0.27],[0.59,0.29]], [[0,1,2,3,4,5,6,7,8,9],[2,10,11,12],[10,4],[13,14,15,3],[14,3]] ] }; /*根据出生日期获取星座信息*/ function getStarSign(ts){ var d=new Date(ts),sign=d.getMonth()*100+d.getDate(); switch(true) { case sign<20: return "摩羯座"; case sign<119: return "水瓶座"; case sign<221: return "双鱼座"; case sign<320: return "白羊座"; case sign<421: return "金牛座"; case sign<522: return "双子座"; case sign<623: return "巨蟹座"; case sign<723: return "狮子座"; case sign<823: return "处女座"; case sign<923: return "天秤座"; case sign<1022: return "天蝎座"; case sign<1122: return "射手座"; default: return "摩羯座"; } } /*绘制星座*/ function constellation(ctx,ary,w,h){ /*创建线条*/ var points=ary[0], lines=ary[1]; ctx.strokeStyle="#FFF"; var len=lines.length,i,ii,line,point; ctx.beginPath(); while(len--) { i=1; line=lines[len]; ii=line.length; point=points[line[0]]; ctx.moveTo(point[0]*w,point[1]*h); for(;i

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