Generally we move our characters using the mouse and keyboard, but in our case, we will rotate or move the camera instead. Keyboard interactions are easier to build compared to mouse interactions. In mouse interactions, we have to calculate the angle of rotation based on the mouse movement on the 2D screen, while in the case of the keyboard, we have to directly modify our camera position with each key press. When a key is pressed, we move the camera by multiplying pi with a constant factor (this.cam.roll(-Math.PI * 0.025)) for each step.
So, let's quickly look at the KeyBoardInteractor.js file present in the primitive directory:
function KeyBoardInteractor(camera, canvas){
this.cam = camera;
this.canvas = canvas;
this.setUp();
}
KeyBoardInteractor.prototype.setUp=function(){
var self=this;
this.canvas.onkeydown = function(event) {
self.handleKeys(event);
}
}The constructor of the KeyBoardInteractor class takes the canvas and camera objects...