Canvas achieves the effects of love and rainbow rain
This article mainly introduces examples of canvas to achieve love and rainbow rain effects, which has a good reference value. Let’s take a look at it
Rendering:
##The code is as follows:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
var canvas = document.getElementById('canvas'),
ctx = canvas.getContext('2d'),
canvasW = canvas.width = window.innerWidth,
canvasH = canvas.height = window.innerHeight,
canvasWHalf = canvasW / 2,
canvasHHalf = canvasH / 2,
xoff = canvasWHalf - 306,
yoff = 50,
bg = '00061a',
id = 0,
raindrops = [],
minSize = 1,
maxSize = 4,
minSpeed = 5,
maxSpeed = 20,
minHue = 0,
maxHue = 360,
maxAmount = 50;
function random(min, max) {
if (arguments.length < 2) {
max = min;
min = 0;
}
return Math.floor(Math.random() * (max - min) + min);
}
function hexToRGB(hex, opacity) {
var rgb = '';
hex.match(/.{2}/g).forEach(function(n) {
rgb += (parseInt(n, 16)) + ',';
});
return 'rgba(' + rgb + opacity + ')';
}
function draw() {
// Heart
ctx.fillStyle = hexToRGB(bg, '0.1');
ctx.beginPath();
// Left half
ctx.moveTo(0, 0);
ctx.lineTo(canvasWHalf, 0);
ctx.lineTo(304 + xoff, 97 + yoff);
ctx.bezierCurveTo(282 + xoff, -5 + yoff, 80 + xoff, -6 + yoff, 76 + xoff, 165 + yoff);
ctx.bezierCurveTo(74 + xoff, 251 + yoff, 184 + xoff, 300 + yoff, 304 + xoff, 447 + yoff);
ctx.lineTo(canvasWHalf, canvasH);
ctx.lineTo(0, canvasH);
// Right half
ctx.moveTo(canvasW, 0);
ctx.lineTo(canvasWHalf, 0);
ctx.lineTo(304 + xoff, 97 + yoff);
ctx.bezierCurveTo(326 + xoff, 5 + yoff, 528 + xoff, 6 + yoff, 532 + xoff, 165 + yoff);
ctx.bezierCurveTo(534 + xoff, 251 + yoff, 424 + xoff, 300 + yoff, 304 + xoff, 447 + yoff);
ctx.lineTo(canvasWHalf, canvasH);
ctx.lineTo(canvasW, canvasH);
ctx.closePath();
ctx.fill();
// Raindrops
for (var i = 1; i < id; i++) {
raindrops[i].fall();
};
}
var Raindrop = function() {
id++;
this.y = random(-canvasH);
this.x = random(canvasW);
this.size = random(minSize, maxSize);
this.speed = random(minSpeed, maxSpeed);
this.color = 'hsl(' + random(minHue, maxHue) + ',100%,55%)';
this.origColor = this.color;
this.id = id;
raindrops[id] = this;
};
Raindrop.prototype.fall = function() {
this.y += this.speed;
if (this.y >= canvasH) {
this.y = random(-canvasH);
this.x = random(canvasW);
}
ctx.save();
ctx.beginPath();
var gradient = ctx.createRadialGradient(this.x, this.y, 0, this.x, this.y, this.size);
gradient.addColorStop(0, '#fff');
gradient.addColorStop(0.5, this.color);
gradient.addColorStop(1, hexToRGB(bg, 0));
ctx.rect(this.x, this.y, this.size, maxSpeed);
ctx.fillStyle = gradient;
ctx.fill();
ctx.closePath();
ctx.restore();
};
(function init() {
ctx.fillStyle = '#' + bg;
ctx.fillRect(0, 0, canvasW, canvasH);
for (var i = 0; i < maxAmount; i++) {
new Raindrop();
}
}());
function animate() {
draw();
window.requestAnimationFrame(animate);
}
window.requestAnimationFrame(animate);
function mouseTrail(x, y) {
ctx.save();
ctx.globalCompositeOperation = 'overlay';
ctx.fillStyle = 'rgba(255,255,255,0.1)';
ctx.arc(x, y, 50, 0, Math.PI * 2);
ctx.fill();
ctx.restore();
}
window.addEventListener('mousemove', function(cursor) {
mouseTrail(cursor.x, cursor.y);
});
</script>
</body>
</html>How to implement element image mirror flip animation effect on canvas
HTML5 canvas draws five-pointed star Methods
The above is the detailed content of Canvas achieves the effects of love and rainbow rain. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1668
14
1428
52
1329
25
1273
29
1256
24
H5: The Evolution of Web Standards and Technologies
Apr 15, 2025 am 12:12 AM
Web standards and technologies have evolved from HTML4, CSS2 and simple JavaScript to date and have undergone significant developments. 1) HTML5 introduces APIs such as Canvas and WebStorage, which enhances the complexity and interactivity of web applications. 2) CSS3 adds animation and transition functions to make the page more effective. 3) JavaScript improves development efficiency and code readability through modern syntax of Node.js and ES6, such as arrow functions and classes. These changes have promoted the development of performance optimization and best practices of web applications.
H5 Code: Best Practices for Web Developers
Apr 16, 2025 am 12:14 AM
Best practices for H5 code include: 1. Use correct DOCTYPE declarations and character encoding; 2. Use semantic tags; 3. Reduce HTTP requests; 4. Use asynchronous loading; 5. Optimize images. These practices can improve the efficiency, maintainability and user experience of web pages.
Is H5 a Shorthand for HTML5? Exploring the Details
Apr 14, 2025 am 12:05 AM
H5 is not just the abbreviation of HTML5, it represents a wider modern web development technology ecosystem: 1. H5 includes HTML5, CSS3, JavaScript and related APIs and technologies; 2. It provides a richer, interactive and smooth user experience, and can run seamlessly on multiple devices; 3. Using the H5 technology stack, you can create responsive web pages and complex interactive functions.
H5 and HTML5: Commonly Used Terms in Web Development
Apr 13, 2025 am 12:01 AM
H5 and HTML5 refer to the same thing, namely HTML5. HTML5 is the fifth version of HTML, bringing new features such as semantic tags, multimedia support, canvas and graphics, offline storage and local storage, improving the expressiveness and interactivity of web pages.
Understanding H5 Code: The Fundamentals of HTML5
Apr 17, 2025 am 12:08 AM
HTML5 is a key technology for building modern web pages, providing many new elements and features. 1. HTML5 introduces semantic elements such as, , etc., which enhances web page structure and SEO. 2. Support multimedia elements and embed media without plug-ins. 3. Forms enhance new input types and verification properties, simplifying the verification process. 4. Offer offline and local storage functions to improve web page performance and user experience.
H5: How It Enhances User Experience on the Web
Apr 19, 2025 am 12:08 AM
H5 improves web user experience with multimedia support, offline storage and performance optimization. 1) Multimedia support: H5 and elements simplify development and improve user experience. 2) Offline storage: WebStorage and IndexedDB allow offline use to improve the experience. 3) Performance optimization: WebWorkers and elements optimize performance to reduce bandwidth consumption.
Deconstructing H5 Code: Tags, Elements, and Attributes
Apr 18, 2025 am 12:06 AM
HTML5 code consists of tags, elements and attributes: 1. The tag defines the content type and is surrounded by angle brackets, such as. 2. Elements are composed of start tags, contents and end tags, such as contents. 3. Attributes define key-value pairs in the start tag, enhance functions, such as. These are the basic units for building web structure.
The Building Blocks of H5 Code: Key Elements and Their Purpose
Apr 23, 2025 am 12:09 AM
Key elements of HTML5 include,,,,,, etc., which are used to build modern web pages. 1. Define the head content, 2. Used to navigate the link, 3. Represent the content of independent articles, 4. Organize the page content, 5. Display the sidebar content, 6. Define the footer, these elements enhance the structure and functionality of the web page.
