Flappy_1

 Have moved on to looking at how Flappy Bird is

put together. Our problem: how to give the illusion that

our bird is moving. We will be using the parallax scrolling 

effect: two things are moving but not at the same speed. The 

background line has to move faster than the mountains in the

 background. We are setting the one at twice the speed of the 

other. 60:30 pixels per second.

The images themselves are made to loop thanks to the modulus

function. Code below:

The trick is to then draw the image at its negative:

we draw our images shifted to the left by their looping point...

To better appreciate what is going on, I added a stripe across

the mountainous backdrop: it goes from dark to light:

This is what happens when I open bird1: