y = 250;

​

vx = 0;

vy = 0;

​

v0x = 20;  // launch velocity

v0y = 10;

​

ax = 0;

ay = 0;

g = -1.63;

​

mass = 3.0;

dt = 0.1;

​

function draw(){

​

    // Update velocity

    vx += ax*dt;

    vy += ay*dt;

    // Update location

    x += vx*dt;

    y += vy*dt;

​

    // Check if arrow keys are pressed

    if (keyIsDown(LEFT_ARROW)) {

        v0x += -1.0;

    }

    if (keyIsDown(RIGHT_ARROW)) {

        v0x += 1.0;     

    }

    if (keyIsDown(UP_ARROW)) {

        v0y += 1.0;             

    }

    if (keyIsDown(DOWN_ARROW)) {

        v0y += -1.0;            

    }    

​

    Fnety = mass*g;

    ay = Fnety/mass;

    // Draw axes and other stuff

    // This will clear the screen and re-draw it

    display();

    drawBird(x,y,vx,vy,ax,ay);

    drawForce(x,y,0,mass*g);    

    if (y < 0) {

      drawText('Game Over!',0.45*width,height/2);

      exit();

    }

    // Add more graphics here before the end of draw()  

} // end draw()  DO NOT ADD ANYTHING AFTER THIS LINE!!!