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I need a way to get the X and Y coordinates of random point on a circle with an origin of (0,0) and a radius of 420px.

This gets 1/2 of the circle.

Code: Select all

const int sr = 420; // Radius
int sx = sr - rand(sr * 2); // X-coordinate
int sy = sqrt(pow(sr, 2) + pow(sx, 2)); // Y-coordinate


Take the center, a random angle, and a random radius. Then use sin/cos to find the coordinates.

Code: Select all

double ang = rand(360);
double radius = rand(420);
int sx = 0 + cos(ang)*radius;
int sy = 0 + sin(ang)*radius;

Thanks!
This made my game very hard... heehee.