zippy-game-engine/dist/systems/input/mouse-system.js

A lightweight game engine for web games

export class MouseSystem {
    x;
    y;
    buttons;
    wheel;
    constructor() {
        this.x = 0;
        this.y = 0;
        this.buttons = {};
        this.wheel = 0;
    }
    setupCanvasEvents(canvas) {
        const options = { passive: false };
        canvas.addEventListener("mousemove", (e) => {
            const rect = canvas.getBoundingClientRect();
            this.x = e.clientX - rect.left;
            this.y = e.clientY - rect.top;
        }, options);
        canvas.addEventListener("mousedown", (e) => {
            this.buttons[e.button] = true;
        }, options);
        canvas.addEventListener("mouseup", (e) => {
            this.buttons[e.button] = false;
        }, options);
        canvas.addEventListener("wheel", (e) => {
            this.wheel = e.deltaY;
            e.preventDefault();
        }, { passive: false });
    }
    update() {
        this.wheel = 0;
    }
    isButtonDown(button) {
        return this.buttons[button] || false;
    }
    getPosition() {
        return { x: this.x, y: this.y };
    }
    getWheel() {
        return this.wheel;
    }
}
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