98 lines
2.7 KiB
JavaScript
98 lines
2.7 KiB
JavaScript
class Ball {
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constructor(ctx, bar) {
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this.ctx = ctx;
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this.bar = bar;
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this.size = 15;
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this.moving = false;
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this.x = this.bar.x + (this.bar.w) / 2;
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this.y = this.bar.y - this.size -1;
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this.speed = 5;
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// this.angle = 90;
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this.bounce(220,340);
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this.color = 'red';
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this.limits = {
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l: this.size,
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t: this.size,
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r: this.ctx.canvas.width - this.size,
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b: this.ctx.canvas.height
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}
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}
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start() {
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this.moving = true;
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}
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update() {
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if (this.move()) {
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this.draw();
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return true;
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}
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return false;
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}
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draw() {
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this.ctx.beginPath();
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this.ctx.arc(this.x, this.y, this.size, 0, 2 * Math.PI, false);
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this.ctx.fillStyle = this.color;
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this.ctx.fill();
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this.ctx.lineWidth = 1;
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this.ctx.strokeStyle = '#003300';
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this.ctx.stroke();
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}
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move() {
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if (this.moving) {
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this.x += this.speed * Math.cos(this.angle);
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this.y += this.speed * Math.sin(this.angle);
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// Escaped from the pad
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if (this.y > this.limits.b) {
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this.moving = false;
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return false;
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}
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if (this.y > this.bar.y ) return true; // Ball is lost, don't check anything else
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if ( (this.y + this.size) > this.bar.y && this.x > this.bar.x && this.x < (this.bar.x + this.bar.w) ) {
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// Down (Bar)
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this.bounce(220,340);
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} else {
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if ( this.x < this.limits.l ) {
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// Left wall
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if (this.angle<this.g2r(180)) this.bounce(20,70); // It was going DOWN
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else this.bounce(290,340); // It was going UP
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} else
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if ( this.x > this.limits.r ) {
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// Right wall
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if (this.angle<this.g2r(180)) this.bounce(110,160); // It was going DOWN
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else this.bounce(200,250); // It was going UP
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} else
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if ( this.y < this.limits.t ) {
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// Top Wall
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this.bounce(20,140);
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}
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}
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} else {
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this.x = this.bar.x + (this.bar.w) / 2;
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this.y = this.bar.y - this.size -1;
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}
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return true;
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}
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bounce(min,max) {
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this.angle = this.g2r( Math.floor(Math.random() * (max-min)) + min );
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}
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g2r(deg) {
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console.log((360+deg)%360);
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return ( ((360+deg)%360) * Math.PI) / 180.0;
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}
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r2g(rad) {
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return rad*180 / Math.PI;
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}
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} |