## Archive for **February 2014**

## Silly small Processing sketch for trig reference

This is just a small Processing sketch that I’m throwing up here for reference. It seems that every time I’m trying to calculate the point on a circle, I forget whether I’m working in angles or radians, etc…

int radius, lines; float angle; PVector center; void setup() { size(600, 600); lines = (int)random(4, 20); if (lines % 2 > 0) { lines += 1; } radius = 200; angle = 360.0 / lines; center = new PVector(width/2.0,height/2,0); smooth(); } void draw() { background(255); fill(0); noStroke(); ellipse(width/2, height/2, radius*2, radius*2); stroke(255); strokeWeight(2); for(int i = 0; i < lines; i++){ float thisAngle = i * angle; float ptX = center.x + sin(radians(thisAngle))*radius; float ptY = center.y + cos(radians(thisAngle))*radius; line(center.x,center.y,ptX,ptY); } }