56 lines
1.4 KiB
JavaScript
56 lines
1.4 KiB
JavaScript
class Bar {
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constructor(ctx, key) {
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this.ctx = ctx;
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this.key = key;
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this.w = 100;
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this.h = 20;
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this.speed = 10; // Target Speed
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this._speed = 0; // Current Speed and direction
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this.xLimit = (ctx.canvas.width - this.w);
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this.reset();
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}
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reset() {
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this.x = (this.ctx.canvas.width - this.w) / 2;
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this.y = (this.ctx.canvas.height - this.h * 2);
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this._y = this.ctx.canvas.height + 10;
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}
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update() {
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this.move();
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this.draw();
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}
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stop() {
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this._speed = 0;
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}
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left() {
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if (this._speed >= 0) this._speed = -this.speed;
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this.x += this._speed;
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if (this.x < 0) this.x = 0;
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this._speed -= 0.5;
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}
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right() {
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if (this._speed <= 0) this._speed = this.speed;
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this.x += this._speed;
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if (this.x > this.xLimit) this.x = this.xLimit;
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this._speed += 0.5;
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}
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move() {
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if (this.key.isDown('ArrowLeft')) this.left();
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else
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if (this.key.isDown('ArrowRight')) this.right();
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else
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this.stop();
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}
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draw() {
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if (this._y != this.y) this._y--;
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if (this._y < this.ctx.canvas.height) {
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this.ctx.fillStyle = 'black';
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this.ctx.fillRect(this.x, this._y, this.w, this.h);
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}
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}
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}
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