#define scr_light
{	
    // First determine the size of the lit area
    var x1,y1,x2,y2,ww;
    ww = 300;
    x1 = argument0-ww/2;
    x2 = argument0+ww/2;
    y1 = argument1-ww/2;
    y2 = argument1+ww/2;
    // Hide things that are far away by drawing black rectangle
    draw_set_color(c_black);
    draw_rectangle(0,0,x1,room_height,false);
    draw_rectangle(x2,0, room_width,room_height,false);
    draw_rectangle(0,0,room_width,y1,false);
    draw_rectangle(0,y2,room_width,room_height,false);
    // Now hide nearby stuff by subtracting the light image
    draw_set_blend_mode(bm_subtract);
    draw_background_stretched(back_light,x1,y1,ww,ww);
    draw_set_blend_mode(bm_normal);
}