3D Game Programming

document.addEventListener('keydown',function(event) {

varcode = event.keyCode;

if(code == 37) marker.position.x = marker.position.x-5;// left

if(code == 38) marker.position.z = marker.position.z-5;// up

if(code == 39) marker.position.x = marker.position.x+5;// right

if(code == 40) marker.position.z = marker.position.z+5;// down

if(code == 67) is_cartwheeling = !is_cartwheeling; // C

if(code == 70) is_flipping = !is_flipping; // F

});

With that, we can move the avatar’s position with the keyboard, but when we

flip or cartwheel, the camera stays upright.

5.5 The Code So Far

If you would like to double-check your code so far, compare it to the code in

Section A1.4, Code: Moving Avatars, on page 220.

4.8 What’s Next

We covered a very important skill in this chapter. We’ll group objects like this

over and over as our gaming skills improve. Grouping simplifies moving things

together, as well as twisting, turning, growing, and shrinking things together.

Before adding even more stuff to our avatar, let’s take a break so that we can

explore JavaScript functions a bit more. We’re already using them to make

a forest, to animate, and to listen for events. There’s even more cool stuff that

we can do with them.

report erratum • discuss

6.5 The Code So Far

Prepared exclusively for Michael Powell