canvas花卉

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// LOVE MATRIX by nutsu, a study for drawing curl curve.
"use strict";
class Mat2 {
	constructor() {
		this.a = 1.0;
		this.b = 0.0;
		this.c = 0.0;
		this.d = 1.0;
		this.tx = 0.0;
		this.ty = 0.0;
	}
	static create() {
		return new Mat2();
	}
	multiply(b) {
		const aa = this.a, ab = this.b, ac = this.c, ad = this.d;
		this.a = aa * b.a + ac * b.b;
		this.b = ab * b.a + ad * b.b;
		this.c = aa * b.c + ac * b.d;
		this.d = ab * b.c + ad * b.d;
		this.tx += aa * b.tx + ac * b.ty;
		this.ty += ab * b.tx + ad * b.ty;
		return this;
	}
	rotate(rad) {
		const aa = this.a, ab = this.b, ac = this.c, ad = this.d;
		const s = Math.sin(rad);
		const c = Math.cos(rad);
		this.a = aa * c + ac * s;
		this.b = ab * c + ad * s;
		this.c = aa * -s + ac * c;
		this.d = ab * -s + ad * c;
		return this;
	}
	translate(x, y) {
		this.tx += this.a * x + this.c * y;
		this.ty += this.b * x + this.d * y;
		return this;
	}
	scale(x, y) {
		this.a *= x;
		this.b *= x;
		this.c *= y;
		this.d *= y;
		return this;
	}
}
class WormObject {
	constructor(x, y, vx, vy, len) {
		this.vmt = Mat2.create().translate(x, y).rotate(Math.atan2(vy, vx));
		const angle = (Math.random() * Math.PI / 2) - (Math.PI / 4);
		this.tmt = Mat2.create().scale(0.92, 0.92).translate(len, 0).rotate(angle);
		this.c1x = this.p1x = -0.5 * this.vmt.c + this.vmt.tx;
		this.c1y = this.p1y = -0.5 * this.vmt.d + this.vmt.ty;
		this.c2x = this.p2x =  0.5 * this.vmt.c + this.vmt.tx;
		this.c2y = this.p2y =  0.5 * this.vmt.d + this.vmt.ty;
		this.r = angle;
		this.w = len * 0.4;
	}
	draw() {
		if (Math.random() > 0.9) {
			this.tmt.rotate(-this.r * 2);
			this.r *= -1;
		}
		this.vmt.multiply(this.tmt);
		const cc1x = -this.w * this.vmt.c + this.vmt.tx;
		const cc1y = -this.w * this.vmt.d + this.vmt.ty;
		const pp1x = (this.c1x + cc1x) / 2;
		const pp1y = (this.c1y + cc1y) / 2;
		const cc2x = this.w * this.vmt.c + this.vmt.tx;
		const cc2y = this.w * this.vmt.d + this.vmt.ty;
		const pp2x = (this.c2x + cc2x) / 2;
		const pp2y = (this.c2y + cc2y) / 2;
		ctx.beginPath();
		ctx.shadowColor = "#000";
		ctx.shadowBlur = this.w * 2;
		ctx.shadowOffsetX = this.w * 0.5;
		ctx.shadowOffsetY = this.w * 0.5;
		ctx.strokeStyle = "#fff";
		ctx.fillStyle = `hsl(${Math.round(this.w * 6 - (hue += 0.04))}, 80%, 60%)`;
		ctx.moveTo(this.p1x, this.p1y);
		ctx.quadraticCurveTo(this.c1x, this.c1y, pp1x, pp1y);
		ctx.lineTo(pp2x, pp2y);
		ctx.quadraticCurveTo(this.c2x, this.c2y, this.p2x, this.p2y);
		ctx.closePath();
		ctx.fill();
		ctx.stroke();
		this.c1x = cc1x;
		this.c1y = cc1y;
		this.p1x = pp1x;
		this.p1y = pp1y;
		this.c2x = cc2x;
		this.c2y = cc2y;
		this.p2x = pp2x;
		this.p2y = pp2y;
	}
}
const canvas = {
	init() {
		this.elem = document.querySelector("canvas");
		this.resize();
		window.addEventListener("resize", () => this.resize(), false);
		return this.elem.getContext("2d");
	},
	resize() {
		this.width = this.elem.width = this.elem.offsetWidth;
		this.height = this.elem.height = this.elem.offsetHeight;
	}
};
const pointer = {
	frame: 0,
	grow(x, y) {
		const vx = x - this.px;
		const vy = y - this.py;
		const len = Math.min(Math.sqrt(vx * vx + vy * vy), 150);
		if (len < 10) return;
		vms.push(new WormObject(x, y, vx, vy, len));
		this.px = x;
		this.py = y;
	},
	move(e, touch) {
		e.preventDefault();
		const pointer = touch ? e.targetTouches[0] : e;
		this.x = pointer.clientX;
		this.y = pointer.clientY;
		this.grow(this.x, this.y);
		this.frame++;
		if (!(this.frame % 2)) {
			ctx.fillStyle = "rgba(0, 8, 16, 0.02)";
			ctx.fillRect(0, 0, canvas.width, canvas.height);
		}
	},
	init(canvas) {
		canvas.elem.addEventListener("mousemove", e => this.move(e, false), false);
		canvas.elem.addEventListener("touchmove", e => this.move(e, true), false);
	}
};
const ctx = canvas.init();
ctx.fillStyle = "#000";
ctx.fillRect(0, 0, canvas.width, canvas.height);
pointer.init(canvas);
const vms = [];
let hue = 180;
const run = () => {
	requestAnimationFrame(run);
	for (let i = 0; i < vms.length; i++) {
		const o = vms[i];
		const x = o.vmt.a * o.vmt.a + o.vmt.b * o.vmt.b;
		if (x * o.w < 0.01) {
			vms.splice(i, 1);
			i--;
		} else o.draw();
	}
};
for (let a = 0; a < 2 * Math.PI; a += Math.random() > 0.9 ? 0.5 : 0.1) {
	setTimeout(() => {
		pointer.grow(
			canvas.width * 0.5 + Math.cos(a) * canvas.width * 0.25,
			canvas.height * 0.5 + Math.sin(a) * canvas.height * 0.25
		);
	}, a * 200);
}
run();

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