Created
December 7, 2016 03:32
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| function getRandom(pre, next) { | |
| return pre + (Math.random() * (next - pre)) * 0.01; | |
| } | |
| var num = 200,arr = [] , x = getRandom(113.953640, 116.953640),y = getRandom(22.537018, 25.537018); | |
| arr.push({x:x,y:y}); | |
| //阿基米德螺旋 | |
| var a =1,b =0.1,fix = 0.001; | |
| for(var i=0;i<num;i++){ | |
| var angle = 0.1 * i; | |
| var _x = x + (a + b * angle) * Math.cos(angle) * fix; | |
| var _y = y + (a + b * angle) * Math.sin(angle) * fix; | |
| arr.push({x:_x,y:_y }); | |
| } | |
| console.log(JSON.stringify(arr)); |
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