80 lines
1.6 KiB
JavaScript
80 lines
1.6 KiB
JavaScript
var vec = p5.Vector;
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class Segment {
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constructor(x, y, size) {
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this.size = size;
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this.pos = new vec(x, y);
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this.forward = new vec(0, 0);
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}
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get_rel(angle, d) {
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let dir = vec.rotate(this.forward, angle);
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dir.setMag(d);
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return vec.add(this.pos, dir)
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}
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follow(x, y) {
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let target = new vec(x, y);
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let dir = vec.sub(this.pos, target);
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this.forward = vec.sub(target, this.pos);
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dir.setMag(this.size);
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this.pos = vec.add(target, dir);
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}
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}
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var n = 0;
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var sizes = [10, 15, 20, 25, 30, 24, 27, 21, 15, 17, ]
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var segments = [];
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function setup() {
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createCanvas(800, 800);
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n = sizes.length;
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for (let i = 0; i < n; i++) {
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let seg = new Segment(400, 400, sizes[i]);
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segments.push(seg);
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}
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}
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function draw() {
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background(150);
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// fisica
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segments[0].follow(mouseX, mouseY);
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for (let i = 1; i < n; i++) {
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let prev_seg = segments[i - 1];
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segments[i].follow(prev_seg.pos.x, prev_seg.pos.y);
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}
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// dibujar
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fill(100, 200, 150);
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stroke(0);
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strokeWeight(2);
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beginShape();
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let head = segments[0];
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let tail = segments[n - 1];
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for (let a = -HALF_PI; a <= HALF_PI; a += PI / 10) {
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let p = head.get_rel(a, head.size);
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vertex(p.x, p.y);
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}
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for (let i = 1; i < n - 1; i++) {
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let p = segments[i].get_rel(HALF_PI, segments[i].size);
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vertex(p.x, p.y);
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}
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for (let a = HALF_PI; a <= HALF_PI + PI; a += PI / 10) {
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let p = tail.get_rel(a, tail.size);
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vertex(p.x, p.y);
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}
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for (let i = n - 2; i >= 1; i--) {
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let p = segments[i].get_rel(-HALF_PI, segments[i].size);
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vertex(p.x, p.y);
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}
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endShape(CLOSE);
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}
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