Rotating circle using polar coordinates
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Programming Questions
•
3 months ago
I was trying to make a circle rotate around the center of the window using sin() and cos(). I later found a similar
example in the Processing website. I know I can use rotate() to get the same effect, but using trig functions you can make the circle travel in an elliptical fashion. Any way I can't figure out why this won't work:
- //declare variables:
- float ang = 0.0;
- float x;
- float y;
- void setup() {
- size(400, 400);
- }
- void draw() {
- background(0);
- //set coordinates of the circle:
- float x = cos(ang)*100;
- float y = sin (ang)*100;
- //translate to the middle of the screen:
- translate(width/2, height/2);
- //draw the circle:
- fill(255, 75);
- ellipse(x, y, 20, 20);
- //increment ang by 0.02
- ang =+ 0.02;
- }
It is very similiar to the example in the Processing website, can anyone tell me why this won't work?
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