p5-svelte

↬ Follow

A segmented line follows the mouse. The relative angle from each segment to the next is calculated with atan2() and the position of the next is calculated with sin() and cos().

Adapted from this p5 example.

Sketch

Code

<script>
  import P5 from "$lib/P5.svelte";
  
  const sketch = (p5) => {
		let x = [],
			y = [],
			segNum = 6,
			segLength = 40;

		for (let i = 0; i < segNum; i++) {
			x[i] = 0;
			y[i] = 0;
		}

		p5.setup = () => {
			p5.createCanvas(865, 400);
			p5.strokeWeight(12);
			p5.stroke('#ed225d80');
		};

		p5.draw = () => {
			p5.background(0);
			dragSegment(0, p5.mouseX, p5.mouseY);
			for (let i = 0; i < x.length - 1; i++) {
				dragSegment(i + 1, x[i], y[i]);
			}
		};

		function dragSegment(i, xin, yin) {
			const dx = xin - x[i];
			const dy = yin - y[i];
			const angle = p5.atan2(dy, dx);
			x[i] = xin - p5.cos(angle) * segLength;
			y[i] = yin - p5.sin(angle) * segLength;
			segment(x[i], y[i], angle);
		}

		function segment(x, y, a) {
			p5.push();
				p5.translate(x, y);
				p5.rotate(a);
				p5.line(0, 0, segLength, 0);
			p5.pop();
		}
	};
</script>

<P5 {sketch} />