90 lines
1.6 KiB
JavaScript
90 lines
1.6 KiB
JavaScript
'use strict';
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const uuid = require('uuid');
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const b2Vec2 = require('box2d-html5').b2Vec2;
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class Body {
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constructor(world) {
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this.x = 0;
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this.y = 0;
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this.r = 0;
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this.b2body = false;
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this.type = 'asteroid';
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this.health = 1;
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this.world = world;
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this.id = uuid.v4().slice(0, 8);
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}
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applyDelta() {
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this.world.applyDelta(this.id, this.packDelta());
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}
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applyForce(x, y, center) {
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let b = this.b2body;
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let c = center ? new b2Vec2(center.x, center.y) : b.GetWorldCenter();
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b.ApplyForce(new b2Vec2(x, y), c);
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}
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applyTorque(f) {
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this.b2body.ApplyTorque(f);
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}
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contact() {
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}
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tick() {
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let pos = this.b2body.GetPosition();
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let bounds = this.world.bounds;
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if(pos.x < bounds.left) this.applyForce(0.03, 0);
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if(pos.x > bounds.right) this.applyForce(-0.03, 0);
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if(pos.y < bounds.top) this.applyForce(0, 0.03);
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if(pos.y > bounds.bottom) this.applyForce(-0, -0.03);
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this.tickType();
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}
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tickType() {
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}
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packDelta() {
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let pos = this.b2body.GetPosition();
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let vel = this.b2body.GetLinearVelocity();
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let rot = this.b2body.GetAngleRadians();
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let rvel = this.b2body.GetAngularVelocity();
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// Simple array to save bandwidth.
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return [pos.x, pos.y, vel.x, vel.y, rot, rvel].concat(this.packTypeDelta());
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}
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packTypeDelta() {
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}
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packFull() {
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}
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get center() {
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return {
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x: this.b2body.GetWorldCenter().x,
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y: this.b2body.GetWorldCenter().y
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};
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}
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get pos() {
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return {
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x: this.b2body.GetPosition().x,
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y: this.b2body.GetPosition().y,
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r: this.b2body.GetAngleRadians()
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};
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}
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get vel() {
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return {
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xvel: this.b2body.GetLinearVelocity().x,
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yvel: this.b2body.GetLinearVelocity().y
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}
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}
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}
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module.exports = Body;
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