-
Notifications
You must be signed in to change notification settings - Fork 12
/
demo2-7.html
executable file
·138 lines (123 loc) · 5.33 KB
/
demo2-7.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
<html>
<head>
<title>Box2dJS</title>
</head>
<body onload="init();">
<canvas id="canvas" width="640" height="480" style="background-color:#333333;" ></canvas>
</body>
<script src="js/Box2d.min.js"></script>
<script>
function init() {
var b2Vec2 = Box2D.Common.Math.b2Vec2
, b2AABB = Box2D.Collision.b2AABB
, b2BodyDef = Box2D.Dynamics.b2BodyDef
, b2Body = Box2D.Dynamics.b2Body
, b2FixtureDef = Box2D.Dynamics.b2FixtureDef
, b2Fixture = Box2D.Dynamics.b2Fixture
, b2World = Box2D.Dynamics.b2World
, b2MassData = Box2D.Collision.Shapes.b2MassData
, b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape
, b2CircleShape = Box2D.Collision.Shapes.b2CircleShape
, b2DebugDraw = Box2D.Dynamics.b2DebugDraw
, b2MouseJointDef = Box2D.Dynamics.Joints.b2MouseJointDef
;
var worldScale = 30; // box2d中以米为单位，1米=30像素
var gravity = new b2Vec2(0, 5);
var sleep = true;
var world;
var velIterations = 10;// 速率约束解算器
var posIterations = 10;// 位置约束解算器
function main(){
world = new b2World(gravity, sleep);
debugDraw();
brick(275,435,30,30);
brick(365,435,30,30);
brick(320,405,120,30);
brick(320,375,60,30);
brick(305,345,90,30);
brick(320,300,120,60);
idol(320, 242);
floor();
setInterval(updateWorld, 1000 / 60);
}
main();
function brick(px, py, w, h){
var bodyDef = new b2BodyDef();
bodyDef.position.Set(px/worldScale, py/worldScale);
bodyDef.type = b2Body.b2_dynamicBody;
var polygonShape = new b2PolygonShape();
polygonShape.SetAsBox(w/2/worldScale, h/2/worldScale);
var fixtureDef = new b2FixtureDef();
fixtureDef.shape = polygonShape;
fixtureDef.density = 2;
fixtureDef.restitution = .4;
fixtureDef.friction = .5;
var theBrick = world.CreateBody(bodyDef);
theBrick.CreateFixture(fixtureDef);
}
function idol(px, py){
var bodyDef = new b2BodyDef();
bodyDef.position.Set(px/worldScale, py/worldScale);
bodyDef.type = b2Body.b2_dynamicBody;
var polygonShape = new b2PolygonShape();
polygonShape.SetAsBox(5/worldScale, 20/worldScale);
var fixtureDef = new b2FixtureDef();
fixtureDef.shape = polygonShape;
fixtureDef.density = 1;
fixtureDef.restitution = .4;
fixtureDef.friction = .5;
var theIdol = world.CreateBody(bodyDef);
theIdol.CreateFixture(fixtureDef);
// 创建定向矩形
var bW = 5/worldScale;
var bH = 20/worldScale;
var boxPos = new b2Vec2(0, 10/worldScale);// 可以使用矩形内的相对位置
var boxAngle = -Math.PI / 4;
// 左倾矩形
polygonShape.SetAsOrientedBox(bW, bH, boxPos, boxAngle);
fixtureDef.shape = polygonShape;
theIdol.CreateFixture(fixtureDef);
// 右倾矩形
boxAngle = Math.PI / 4;
polygonShape.SetAsOrientedBox(bW, bH, boxPos, boxAngle);
fixtureDef.shape = polygonShape;
theIdol.CreateFixture(fixtureDef);
// 用多边形方式创建凸多边形
var vertices = new Box2D.NVector();
vertices.push(new b2Vec2(-15/worldScale,-25/worldScale));
vertices.push(new b2Vec2(0,-90/worldScale));
vertices.push(new b2Vec2(15/worldScale, -25/worldScale));
vertices.push(new b2Vec2(0,-10/worldScale));
polygonShape.SetAsVector(vertices, 4);
fixtureDef.shape = polygonShape;
theIdol.CreateFixture(fixtureDef);
}
function floor(){
var bodyDef = new b2BodyDef();
bodyDef.position.Set(320/worldScale, 465/worldScale);
var polygonShape = new b2PolygonShape();
polygonShape.SetAsBox(320/worldScale, 15/worldScale);
var fixtureDef = new b2FixtureDef();
fixtureDef.shape = polygonShape;
fixtureDef.restitution = .4;
fixtureDef.friction = .5;
var theFloor = world.CreateBody(bodyDef);
theFloor.CreateFixture(fixtureDef);
}
function updateWorld() {
world.Step(1/30, 10, 10);// 更新世界模拟
world.DrawDebugData(); // 显示刚体debug轮廓
world.ClearForces(); // 清除作用力
}
//setup debug draw
function debugDraw(){
var debugDraw = new b2DebugDraw();
debugDraw.SetSprite(document.getElementById("canvas").getContext("2d"));
debugDraw.SetDrawScale(worldScale);
debugDraw.SetFillAlpha(0.5);
debugDraw.SetFlags(b2DebugDraw.e_shapeBit | b2DebugDraw.e_jointBit);
world.SetDebugDraw(debugDraw);
}
};
</script>
</html>