2d-physics-engine/dist/components/Transform.component.js

A lightweight, flexible 2D physics engine with ECS architecture, built with TypeScript

import { Vector2 } from '../math/Vector2';
import { Component } from './Component.abstract';
export class Transform extends Component {
    constructor(position = new Vector2(), rotation = 0, // In radians
    scale = new Vector2(1, 1)) {
        super();
        Object.defineProperty(this, "position", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: position
        });
        Object.defineProperty(this, "rotation", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: rotation
        });
        Object.defineProperty(this, "scale", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: scale
        });
        Object.defineProperty(this, "componentId", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: Symbol('Transform')
        });
    }
    // Transform a point from local space to world space
    transformPoint(point) {
        // First scale
        let transformed = new Vector2(point.x * this.scale.x, point.y * this.scale.y);
        // Then rotate
        transformed = transformed.rotate(this.rotation);
        // Finally translate
        return transformed.add(this.position);
    }
    // Transform a point from world space to local space
    inverseTransformPoint(point) {
        // Subtract position
        let transformed = point.subtract(this.position);
        // Inverse rotate
        transformed = transformed.rotate(-this.rotation);
        // Inverse scale
        return new Vector2(transformed.x / this.scale.x, transformed.y / this.scale.y);
    }
    // Getters and setters
    getPosition() {
        return this.position.clone();
    }
    setPosition(position) {
        this.position = position.clone();
    }
    getRotation() {
        return this.rotation;
    }
    setRotation(rotation) {
        this.rotation = rotation;
    }
    getScale() {
        return this.scale.clone();
    }
    setScale(scale) {
        this.scale = scale.clone();
    }
    update() { }
}
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