1
 /*
2
 * HexGL
3
 * @author Thibaut 'BKcore' Despoulain <http://bkcore.com>
4
 * @license This work is licensed under the Creative Commons Attribution-NonCommercial 3.0 Unported License. 
5
 *          To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/3.0/.
6
 */
7

8
var bkcore = bkcore || {};
9
bkcore.hexgl = bkcore.hexgl || {};
10

11
bkcore.hexgl.CameraChase = function(opts)
12
{
13
	this.dir = new THREE.Vector3(0,0,1);
14
	this.up = new THREE.Vector3(0,1,0);
15
	this.target = new THREE.Vector3();
16
	this.speedOffset = 0;
17
	this.speedOffsetMax = 10;
18
	this.speedOffsetStep = 0.05;
19

20
	this.modes = {
21
		CHASE: 0,
22
		ORBIT: 1
23
	}
24
	this.mode = this.modes.CHASE;
25

26
	this.camera = opts.camera;
27
	this.targetObject = opts.target;
28
	this.cameraCube = opts.cameraCube == undefined ? null : opts.cameraCube;
29

30
	this.yoffset = opts.yoffest == undefined ? 8.0 : opts.yoffest;
31
	this.zoffset = opts.zoffset == undefined ? 10.0 : opts.zoffset;
32
	this.viewOffset = opts.viewOffset == undefined ? 10.0 : opts.viewOffset;
33
	this.orbitOffset = 12;
34
	this.lerp = opts.lerp == undefined ? 0.5 : opts.lerp;
35
	this.time = 0.0;
36
}
37

38
bkcore.hexgl.CameraChase.prototype.update = function(dt, ratio)
39
{
40
	if(this.mode == this.modes.CHASE)
41
	{
42
		this.dir.set(0,0,1);
43
		this.up.set(0,1,0);
44

45
		this.targetObject.matrix.rotateAxis(this.up);
46
		this.targetObject.matrix.rotateAxis(this.dir);
47

48
		this.speedOffset += (this.speedOffsetMax*ratio - this.speedOffset) * Math.min(1, 0.3*dt);
49

50
		this.target.copy(this.targetObject.position);
51
		this.target.subSelf(this.dir.multiplyScalar(this.zoffset + this.speedOffset));
52
		this.target.addSelf(this.up.multiplyScalar(this.yoffset));
53
		this.target.y += -this.up.y + this.yoffset;
54
		this.camera.position.copy(this.target);
55
		
56
		this.camera.lookAt(this.dir.normalize().multiplyScalar(this.viewOffset).addSelf(this.targetObject.position));
57
	}
58
	else if(this.mode == this.modes.ORBIT)
59
	{
60
		this.time += dt*.008;
61
		this.dir.set(
62
			Math.cos(this.time)*this.orbitOffset,
63
			this.yoffset/2,
64
			Math.sin(this.time)*this.orbitOffset
65
		);
66
		this.target.copy(this.targetObject.position).addSelf(this.dir);
67
		this.camera.position.copy(this.target);
68
		this.camera.lookAt(this.targetObject.position);
69
	}
70

71
	if(this.cameraCube != null)
72
		this.cameraCube.rotation.copy(this.camera.rotation);
73
}
74