Game Development Reference
In-Depth Information
The
handleKeys
handler is pretty simple. If the keyboard keys are pressed along
with the
Shift
key, then the handler invokes the
yaw
,
pitch
, or
roll
function of
our camera object, rotating the corresponding vectors with a constant value (
this.
cam.roll(-Math.PI * 0.025)
). If the
Shift
key is not pressed, then the handler
gets the current position of the camera (
var pos = this.cam.getPosition()
)
and then changes it by adding or subtracting the respective constant value of
the
x
,
y
, and
z
axes of the position property of the camera object (
this.cam.
setPosition([pos[0]+10, pos[1], pos[2]])
; here,
10
indicates the changed
x
value of the camera so as to move along positive
x
axis).
KeyBoardInteractor.prototype.handleKeys=function (event) {
if(event.shiftKey) {
switch(event.keyCode) {//determine the key pressed
case 65://a key
this.cam.roll(-Math.PI * 0.025);//tilt to the left
break;
case 37://left arrow
this.cam.yaw(Math.PI * 0.025);//rotate to the left
break;
case 68://d key
this.cam.roll(Math.PI * 0.025);//tilt to the right
break;
case 39://right arrow
this.cam.yaw(-Math.PI * 0.025);//rotate to the right
break;
case 83://s key
case 40://down arrow
this.cam.pitch(Math.PI * 0.025);//look down
break;
case 87://w key
case 38://up arrow
this.cam.pitch(-Math.PI * 0.025);//look up
break;
}
}
else {
var pos = this.cam.getPosition();
switch(event.keyCode) {//determine the key pressed
case 65://a key
case 37://left arrow
this.cam.setPosition([pos[0]-10, pos[1],
pos[2]]);//move - along the X axis
break;
case 68://d key
case 39://right arrow
