PGRF1 - cviceni 14.11.2011

public class Usecka {
        public int x1,x2,y1,y2;
        float k, q;

        public void prohod() {
            if (y2 < y1) {
                int p;
                p = y1;
                y1 = y2;
                y2 = p;
                p = x1;
                x1 = x2;
                x2 = p;

            }
        }

        public void vypocti() {
            k = (float) (x2 - x1) / (y2 - y1);
            q = (float) x1 - (k * y1);

        }

        public void zkrat() {

        }

        public boolean jePrusecik(int y) {
            return (y>=y1 && y<y2);
        }

        public int vypoctiPrusecik(int y) {
            /*
            float dx = x1 - x2;
            float dy = y1 - y2;
            float c = dx / dy;
            float x = c * (y - y1) + x1;
            return (int)x;
            */
            return (int) (k*x + q);
        }


}