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- distance: function(x1, y1, x2, y2) {
- return Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2));
- },
- angle: function(x1, y1, x2, y2) {
- var x = x1 - x2;
- var y = y1 - y2;
- var l = Util.distance(x1, y1, x2, y2);
- // var result = Math.atan(x / y) / (-Math.PI * 2);
- // var result = (Math.acos(y / l) / (Math.PI * 2)) * 360;
- var result = Math.acos(y / l);
- return result;
- }
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