flappy.blr

int rseed = 26854266;

func int rand(int min, int max) {
    rseed = rseed * 3627 + min;
    if (rseed < 0) {
        rseed = -rseed;
    }
    return (rseed % (max - min)) + min;
}

/* entity declarations */

entity bird {
    clr = (255, 0, 255);
    size = (20, 20);
    int yspeed = 0;

    key_A -> { remove();} 
    key_UP -> { self.yspeed = 20; } 

    self >< wall -> { restart(); }

    frame -> { 
	self.yspeed = self.yspeed - 2;
        self.pos[1] = self.pos[1] - self.yspeed;
        if (self.pos[1] > 400 || self.pos[1] < 0) {
            restart();            
        }
    }
}

entity wall {
    clr = (0, 0, 0);
    size = (20, 420);

    frame -> {
        self.pos[0] = self.pos[0] - 15;
    }
}

entity control {
    clr = (0, 0, 0);
    size = (0, 0);
    int timer = 30;

    frame -> {
        int gap_size = rand(100, 200);
        int gap_height = rand(50, 420 - gap_size - 20);
        self.timer = self.timer - 1;
        if (self.timer == 0) {
            add(wall, (680, -gap_height - gap_size));
            add(wall, (680, 420 - gap_height));
            self.timer = 30;
        }
    }
}

/* gameboard declaration */
gameboard g1{
    clr = (255,255,255);
    size = (680,420);
    init -> {
	add(bird, (50,150));
        add(wall, (680, -250));
        add(wall, (680, 300));        
        add(control, (680, 420));
    }
}