Trig

gistfile1.txt

Because I always forget...

// Get the angle between two points

atan2(y2-y1,x2-x1);

// Get the x and y of an object around a radius, given an angle.

x = cos(radians(angle)) * radius 

y = sin(radians(angle)) * radius

// You can create weird orbits by changing the result of sin. For example:

y = sin(radians(angle))/2 * radius;

// And of course, add offset X and Ys if your circle isn’t at 0,0.

x = (cos(radians(angle)) * radius) + offsetX

y = (sin(radians(angle)) * radius) + offsetY

// Get the distance between two points.

sqrt(pow(y2-y1,2) + pow(x2-x1,2))