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<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>