Question

I have an area to display an image that has a max size of 240×180

If I have an image of 400×423 how can I calculate a new width and height for that image that best fits into my 240×180 box? (In this case it would be 170×180)

Answer 1

there are probably some image libraries that do this well, but the math is pretty simple.

ratio = orig_x * 1.0 / orig_y;

x_oversized = (orig_x > MAX_X);
y_oversized = (orig_y > MAX_Y);

if (x_oversized OR y_oversized)
{
      new_x = min(MAX_X, ratio * MAX_Y);
      new_y = min(MAX_Y, MAX_X / ratio);
}