50 lines
1.5 KiB
JavaScript
50 lines
1.5 KiB
JavaScript
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class Particle {
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constructor(x, y) {
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this.mass = 1;
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this.position = createVector(x, y);
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this.velocity = createVector(0, 0);
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this.gravity = createVector(0, 10); // G = 9.81
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this.hue = 0;
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this.saturation = 0;
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this.brightness = 100;
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this.alpha = 1;
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this.size = 8;
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this.lifetime = 0;
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}
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move(force) {
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if (this.position.y > 600) return;
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// 计算加速度
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const acceleration = createVector(0, 0);
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acceleration.add(this.gravity);
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if (force) acceleration.add(force.div(this.mass));
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// 计算时间差
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const duration = deltaTime / 1000;
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this.lifetime += duration;
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// 计算速度差及位移
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const deltaVelocity = acceleration.mult(duration);
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const averageVelocity = deltaVelocity.copy().div(2).add(this.velocity);
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const movement = averageVelocity.mult(duration);
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// 更新速度及位置
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this.velocity.add(deltaVelocity);
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this.position.add(movement);
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const report = {
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time: this.lifetime.toFixed(3),
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height: (height - this.position.y).toFixed(3),
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velocity: this.velocity.mag().toFixed(3),
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};
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print(report);
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}
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show() {
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noStroke();
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fill(this.hue, this.saturation, this.brightness, this.alpha);
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circle(this.position.x, this.position.y, this.size);
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}
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}
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class Particles {
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constructor() {}
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show() {}
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}
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