if (image_index == 0)
    direction = 180;
if (image_index == 1)
    direction = 120;
if (image_index == 2)
    direction = 76;
if (image_index == 3)
    direction = 0;
if (image_index == 4)
    direction = 300;
if (image_index == 5)
    direction = 230;
speed = 13;
gravity_direction = 270;
gravity = 2;
friction = 0.05;