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code-base

JavaScript

draw_heart.html

draw_heart.html 5.36 KB

<!DOCTYPE html>
<html lang="en">
 <head>
 <meta charset="UTF-8" />
 <meta name="viewport" content="width=device-width, initial-scale=1.0" />
 <title>Heart</title>
 <style>
 body {
 margin: 0;
 overflow: hidden;
 background-color: #1a001a;
 }
 canvas {
 display: block;
 }
 </style>
 </head>
 <body>
 <canvas id="heartCanvas"></canvas>
 <script>
 const canvas = document.getElementById("heartCanvas");
 const ctx = canvas.getContext("2d");

canvas.width = window.innerWidth;
 canvas.height = window.innerHeight;

const BG_COLOR = "#1a001a";
 const PARTICLE_COUNT = 600;
 const HEART_SCALE = 20;
 const ANIMATION_DURATION = 360; // Number of frames
 const COLORS = [
 "#ffc0cb",
 "#ff69b4",
 "#db7093",
 "#e6e6fa",
 "#dda0dd",
 "#ffffff",
 ];

class Particle {
 constructor() {
 const t = Math.random() * 2 * Math.PI;
 this.targetX = HEART_SCALE * (16 * Math.pow(Math.sin(t), 3));
 this.targetY =
 HEART_SCALE *
 (13 * Math.cos(t) -
 5 * Math.cos(2 * t) -
 2 * Math.cos(3 * t) -
 Math.cos(4 * t));

// Center the heart
 this.targetX += canvas.width / 2;
 this.targetY = -this.targetY + canvas.height / 2; // Y is inverted in canvas

this.startX = Math.random() * canvas.width;
 this.startY = Math.random() * canvas.height;

this.x = this.startX;
 this.y = this.startY;

this.dx = (this.targetX - this.startX) / ANIMATION_DURATION;
 this.dy = (this.targetY - this.startY) / ANIMATION_DURATION;

this.vx = 0;
 this.vy = 0;

this.size = Math.random() * 2 + 1;
 this.color = COLORS[Math.floor(Math.random() * COLORS.length)];
 }

update(mouseX, mouseY) {
 if (frame < ANIMATION_DURATION) {
 // Initial formation animation
 this.x += this.dx;
 this.y += this.dy;
 } else {
 // Move towards target position
 const dxTarget = this.targetX - this.x;
 const dyTarget = this.targetY - this.y;
 const distanceTarget = Math.sqrt(
 dxTarget * dxTarget + dyTarget * dyTarget
 );

// Apply a force to return to the target
 if (distanceTarget > 0.1) {
 this.vx += dxTarget * 0.001;
 this.vy += dyTarget * 0.001;
 }

// Repulsion from mouse
 const dxMouse = this.x - mouseX;
 const dyMouse = this.y - mouseY;
 const distanceMouse = Math.sqrt(
 dxMouse * dxMouse + dyMouse * dyMouse
 );
 const repulsionRadius = 60;

if (distanceMouse < repulsionRadius) {
 const force = (repulsionRadius - distanceMouse) / repulsionRadius;
 this.vx += (dxMouse / distanceMouse) * force * 0.5;
 this.vy += (dyMouse / distanceMouse) * force * 0.5;
 }

// Apply friction/damping
 this.vx *= 0.95;
 this.vy *= 0.95;

// Update position
 this.x += this.vx;
 this.y += this.vy;
 }
 }

draw() {
 ctx.beginPath();
 ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
 ctx.fillStyle = this.color;
 ctx.fill();
 }
 }

const particles = [];
 for (let i = 0; i < PARTICLE_COUNT; i++) {
 particles.push(new Particle());
 }

let frame = 0;
 let mouseX = -1000;
 let mouseY = -1000;

function animate() {
 ctx.fillStyle = BG_COLOR;
 ctx.fillRect(0, 0, canvas.width, canvas.height);

particles.forEach((p) => {
 p.update(mouseX, mouseY);
 p.draw();
 });

if (frame < ANIMATION_DURATION) {
 frame++;
 } else {
 // Final draw is now part of the continuous loop
 // Add text when animation is "done"
 ctx.fillStyle = "white";
 ctx.font = "italic 16px Arial";
 ctx.textAlign = "center";
 ctx.fillText(
 "Made with Love",
 canvas.width / 2,
 canvas.height / 2 - 10
 );
 ctx.fillText(
 "For TQW, My Dear",
 canvas.width / 2,
 canvas.height / 2 + 10
 );
 }
 requestAnimationFrame(animate);
 }

animate();

window.addEventListener("mousemove", (e) => {
 mouseX = e.clientX;
 mouseY = e.clientY;
 });

window.addEventListener("mouseout", () => {
 mouseX = -1000;
 mouseY = -1000;
 });

window.addEventListener("resize", () => {
 canvas.width = window.innerWidth;
 canvas.height = window.innerHeight;
 // Re-center particles on resize
 particles.forEach((p) => {
 const t = Math.random() * 2 * Math.PI;
 p.targetX = HEART_SCALE * (16 * Math.pow(Math.sin(t), 3));
 p.targetY =
 HEART_SCALE *
 (13 * Math.cos(t) -
 5 * Math.cos(2 * t) -
 2 * Math.cos(3 * t) -
 Math.cos(4 * t));
 p.targetX += canvas.width / 2;
 p.targetY = -p.targetY + canvas.height / 2;
 });
 });
 </script>
 </body>
</html>

一键复制编辑原始数据按行查看历史

青羽提交于 2025年11月16日 23:05 +08:00 . [JavaScript] upgrade draw_heart: 鼠标交互

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<!DOCTYPE html>
<html lang="en">
 <head>
 <meta charset="UTF-8" />
 <meta name="viewport" content="width=device-width, initial-scale=1.0" />
 <title>Heart</title>
 <style>
 body {
 margin: 0;
 overflow: hidden;
 background-color: #1a001a;
 }
 canvas {
 display: block;
 }
 </style>
 </head>
 <body>
 <canvas id="heartCanvas"></canvas>
 <script>
 const canvas = document.getElementById("heartCanvas");
 const ctx = canvas.getContext("2d");

 canvas.width = window.innerWidth;
 canvas.height = window.innerHeight;

 const BG_COLOR = "#1a001a";
 const PARTICLE_COUNT = 600;
 const HEART_SCALE = 20;
 const ANIMATION_DURATION = 360; // Number of frames
 const COLORS = [
 "#ffc0cb",
 "#ff69b4",
 "#db7093",
 "#e6e6fa",
 "#dda0dd",
 "#ffffff",
 ];

 class Particle {
 constructor() {
 const t = Math.random() * 2 * Math.PI;
 this.targetX = HEART_SCALE * (16 * Math.pow(Math.sin(t), 3));
 this.targetY =
 HEART_SCALE *
 (13 * Math.cos(t) -
 5 * Math.cos(2 * t) -
 2 * Math.cos(3 * t) -
 Math.cos(4 * t));

 // Center the heart
 this.targetX += canvas.width / 2;
 this.targetY = -this.targetY + canvas.height / 2; // Y is inverted in canvas

 this.startX = Math.random() * canvas.width;
 this.startY = Math.random() * canvas.height;

 this.x = this.startX;
 this.y = this.startY;

 this.dx = (this.targetX - this.startX) / ANIMATION_DURATION;
 this.dy = (this.targetY - this.startY) / ANIMATION_DURATION;

 this.vx = 0;
 this.vy = 0;

 this.size = Math.random() * 2 + 1;
 this.color = COLORS[Math.floor(Math.random() * COLORS.length)];
 }

 update(mouseX, mouseY) {
 if (frame < ANIMATION_DURATION) {
 // Initial formation animation
 this.x += this.dx;
 this.y += this.dy;
 } else {
 // Move towards target position
 const dxTarget = this.targetX - this.x;
 const dyTarget = this.targetY - this.y;
 const distanceTarget = Math.sqrt(
 dxTarget * dxTarget + dyTarget * dyTarget
 );

 // Apply a force to return to the target
 if (distanceTarget > 0.1) {
 this.vx += dxTarget * 0.001;
 this.vy += dyTarget * 0.001;
 }

 // Repulsion from mouse
 const dxMouse = this.x - mouseX;
 const dyMouse = this.y - mouseY;
 const distanceMouse = Math.sqrt(
 dxMouse * dxMouse + dyMouse * dyMouse
 );
 const repulsionRadius = 60;

 if (distanceMouse < repulsionRadius) {
 const force = (repulsionRadius - distanceMouse) / repulsionRadius;
 this.vx += (dxMouse / distanceMouse) * force * 0.5;
 this.vy += (dyMouse / distanceMouse) * force * 0.5;
 }

 // Apply friction/damping
 this.vx *= 0.95;
 this.vy *= 0.95;

 // Update position
 this.x += this.vx;
 this.y += this.vy;
 }
 }

 draw() {
 ctx.beginPath();
 ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
 ctx.fillStyle = this.color;
 ctx.fill();
 }
 }

 const particles = [];
 for (let i = 0; i < PARTICLE_COUNT; i++) {
 particles.push(new Particle());
 }

 let frame = 0;
 let mouseX = -1000;
 let mouseY = -1000;

 function animate() {
 ctx.fillStyle = BG_COLOR;
 ctx.fillRect(0, 0, canvas.width, canvas.height);

 particles.forEach((p) => {
 p.update(mouseX, mouseY);
 p.draw();
 });

 if (frame < ANIMATION_DURATION) {
 frame++;
 } else {
 // Final draw is now part of the continuous loop
 // Add text when animation is "done"
 ctx.fillStyle = "white";
 ctx.font = "italic 16px Arial";
 ctx.textAlign = "center";
 ctx.fillText(
 "Made with Love",
 canvas.width / 2,
 canvas.height / 2 - 10
 );
 ctx.fillText(
 "For TQW, My Dear",
 canvas.width / 2,
 canvas.height / 2 + 10
 );
 }
 requestAnimationFrame(animate);
 }

 animate();

 window.addEventListener("mousemove", (e) => {
 mouseX = e.clientX;
 mouseY = e.clientY;
 });

 window.addEventListener("mouseout", () => {
 mouseX = -1000;
 mouseY = -1000;
 });

 window.addEventListener("resize", () => {
 canvas.width = window.innerWidth;
 canvas.height = window.innerHeight;
 // Re-center particles on resize
 particles.forEach((p) => {
 const t = Math.random() * 2 * Math.PI;
 p.targetX = HEART_SCALE * (16 * Math.pow(Math.sin(t), 3));
 p.targetY =
 HEART_SCALE *
 (13 * Math.cos(t) -
 5 * Math.cos(2 * t) -
 2 * Math.cos(3 * t) -
 Math.cos(4 * t));
 p.targetX += canvas.width / 2;
 p.targetY = -p.targetY + canvas.height / 2;
 });
 });
 </script>
 </body>
</html>