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Generate normalized value from atan2MAth problem. In this js (qtz attached), I have mouse moevment constrained to a circle. Anyone know the correct math for turning atan2(x,y) to normalized output [0, 1]? Essentially I just need to rotate 180 degrees. Can't get it.... function (__number px, __number py, __number norm) main (__number x0, __number y0, __number mouseX, __number mouseY, __number radius) { var result = new Object(); //x0 = 0; //y0 = 0; var angle = Math.atan2(mouseX, mouseY); var distance = Math.sqrt(Math.pow(mouseX  x0, 2)+Math.pow(mouseY  y0, 2)); if (Math.ceil(distance) >= radius) { result.px = x0 + (Math.sin(angle) * radius); result.py = y0 + (Math.cos(angle) * radius); } else { result.px = mouseX; result.py = mouseY; } //How to normalize for [0,1] range? result.norm = angle/3.14159265 + 1; //result.norm = angle/Math.PI; return result; }
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ah, typos, and can't edit original, sigh....
(also, any js streamlining tips appreciated).
If you divide any angle by 360 you'll wind up with a 0~1 range result for the first 360 degrees of rotation.
Ok, got it.