49 lines
987 B
JavaScript
49 lines
987 B
JavaScript
const MAX_SPEED = 20;
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const MAX_JUMP = 2;
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const G = 500;
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class Box {
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constructor() {
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this.position = 0;
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this.speed = 0;
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this.size = 100;
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this.jumpCounter = MAX_JUMP;
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}
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drawOn(canvas) {
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let ctx = canvas.getContext('2d');
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ctx.fillStyle = 'rgb(0, 0, 0)';
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ctx.beginPath();
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ctx.rect(
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canvas.width / 2.0 - this.size / 2.0,
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canvas.height - this.size - this.position,
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this.size,
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this.size
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);
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ctx.fill();
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}
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update(time = 0.002) {
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this.speed -= G * time;
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this.speed = Math.max(this.speed, -MAX_SPEED);
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this.position += this.speed;
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if (this.position <= 0) {
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this.position = 0;
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this.speed = 0;
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this.jumpCounter = MAX_JUMP;
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}
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}
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jump() {
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if (this.jumpCounter > 0) {
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this.jumpCounter--;
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this.speed = MAX_SPEED;
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}
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}
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}
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