Question

I’ve got two points between which im drawing a line (x1,y1 and x2,y2) but i need to know the coordinates of x3,y3 which is gapSize away from point x2,y2. Any ideas on how to solve this problem (the program is written in objective-c if that is helpful at all)?

Answer 1

You can simply calculate the angle in radians as

double rads = atan2(y2 - y1, x2 - x1);

Then you get the coordinates as follows:

double x3 = x2 + gapSize * cos(rads);
double y3 = y2 + gapSize * sin(rads);

Is this what you meant?