Water effect

//Create event
image_speed = 0
image_index = 0
angle = 0
part = 8
wavespeed = 0.2

//End step event
angle += wavespeed;

//Draw event
var i; {
    for (i=0; i<=background_width[1]/part; i+=1) {
        draw_set_blend_mode(bm_add) {
            draw_background_part_ext(background_index[1],i*part,0,part,background_height[1],view_xview[0]+i*part,view_yview[0]+sin(angle+i),1,1,c_white,0.3);
        }
        draw_set_blend_mode(bm_normal);
    }
}