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add client side physics

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by god did this take a lot of debugging to get working
This commit is contained in:
Asraelite 2016-03-24 00:13:10 +00:00
parent 65f78ec3ac
commit 1412cabbb4
19 changed files with 697 additions and 71 deletions
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89
public/js/starbugs/world/physics.js
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function Physics() {
var b2Vec2 = Box2D.Common.Math.b2Vec2;
var b2World = Box2D.Dynamics.b2World;
var b2Body = Box2D.Dynamics.b2Body;
var b2BodyDef = Box2D.Dynamics.b2BodyDef;
var b2Fixture = Box2D.Dynamics.b2Fixture;
var b2FixtureDef = Box2D.Dynamics.b2FixtureDef;
var b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape;
this.world = new b2World(new b2Vec2(0, 0));
this.toRemove = [];
var b2DebugDraw = Box2D.Dynamics.b2DebugDraw;
var debugDraw = new b2DebugDraw();
debugDraw.SetSprite(document.getElementById("starbugs_canvas").getContext("2d"));
debugDraw.SetDrawScale(SCALE);
debugDraw.SetFillAlpha(0.3);
debugDraw.SetLineThickness(1.0);
debugDraw.SetFlags(b2DebugDraw.e_shapeBit | b2DebugDraw.e_jointBit);
this.world.SetDebugDraw(debugDraw);
this.createBody = function(body) {
var s = SCALE;
var bodyDef = new b2BodyDef();
bodyDef.userData = body;
bodyDef.position = new b2Vec2(body.x || 0, body.y || 0);
bodyDef.fixedRotation = false;
bodyDef.active = true;
bodyDef.linearVelocity = new b2Vec2(0, 0);
bodyDef.angularVelocity = 0;
bodyDef.linearDamping = body.bodyType == 'ship' ? 0.01 : 0.003;
bodyDef.angularDamping = body.bodyType == 'ship' ? 0.01 : 0.003;
bodyDef.type = body.bodyType == 'structure' ?
b2Body.b2_staticBody : b2Body.b2_dynamicBody;
bodyDef.allowSleep = false;
var b2body = this.world.CreateBody(bodyDef);
var fixtureDef = new b2FixtureDef();
fixtureDef.density = 10;
fixtureDef.friction = 1;
fixtureDef.restitution = 1;
for (var i in body.frame) {
var poly = body.frame[i].map(function(vertex) {
return new b2Vec2(vertex[0] / s, vertex[1] / s);
});
fixtureDef.shape = new b2PolygonShape();
fixtureDef.shape.SetAsArray(poly, poly.length);
//console.log(fixtureDef);
b2body.CreateFixture(fixtureDef);
}
body.b2body = b2body;
body.com = b2body.GetLocalCenter();
if (body.bodyType == 'ship') {
console.log(body.getPos());
//console.log(b2body.GetLocalCenter());
//console.log(body);
//console.log(b2body.GetMass());
//console.log(b2body.GetFixtureList().GetShape());
}
}
this.removeBody = function(body) {
this.toRemove.push(body.b2body);
}
this.step = function() {
this.world.Step(1, 5, 1 / 60);
this.world.ClearForces();
//this.world.DrawDebugData();
for (var i in game.world.bodies) {
var s = SCALE;
var body = game.world.bodies[i];
if (!body.updated) continue;
body.b2body.SetPositionAndAngle(new b2Vec2(body.x, body.y), body.r);
body.b2body.SetLinearVelocity(new b2Vec2(body.xvel, body.yvel));
body.b2body.SetAngularVelocity(body.rvel);
body.updated = false;
}
for (var i = 0; i < this.toRemove.length; i++) {
this.world.DestroyBody(this.toRemove[i]);
}
this.toRemove = [];
}
}