Several common methods for implementing sequence frame animation in front-end

Preface

There are many ways to implement sequence frame animation at the front end, common methods include: using CSS animation, JavaScript control, Canvas drawing, SVG animation, and WebGL. 

Among them, using CSS animation and JavaScript control is the most basic and easy to implement, suitable for beginners and simple animation needs, while Canvas, SVG and WebGL are suitable for more complex and high-performance animation scenarios.

This article will focus on the details of theCanvas drawingmethod.

1. CSS animation

CSS animation is the basic method to implement sequence frame animation and is suitable for simple animation scenes. By using CSSanimationProperties and@keyframesRules, frame animation can be easily implemented.

1. Use CSS Sprite

CSS Sprite combines multiple images into a large image, and then displays different frames by changing the position of the background image to achieve animation effects.

<div class="sprite-animation"></div>

.sprite-animation {
    width: 100px;
    height: 100px;
    background: url('') no-repeat;
    animation: play 1s steps(10) infinite;
}
@keyframes play {
    100% { background-position: -1000px 0; }
}

In this example, assumeContains 10 frames, each frame has a width of 100px, throughstepsFunctions implement frame-by-frame animation.

2. JavaScript control

Controlling frame animation with JavaScript provides greater flexibility and control capabilities, suitable for scenes where dynamic control animation is required.

1. Set the timer

passsetIntervalorrequestAnimationFrameChange pictures regularlysrcThe location of the attribute or background image to realize frame animation.

<img  src="" width="100" height="100">

const frames = ['', '', '', ''];
let currentFrame = 0;
const imgElement = ('animation');
setInterval(() => {
    currentFrame = (currentFrame + 1) % ;
     = frames[currentFrame];
}, 100); // Every100Switch one frame in milliseconds

III. Canvas drawing

Canvas provides powerful drawing capabilities that enable more complex and high-performance frame animations. The following details how to use Canvas to draw sequence frame animation.

1. Initialize Canvas

First, create a Canvas element and get its drawing context.

<canvas  width="500" height="500"></canvas>

const canvas = ('animationCanvas');
const ctx = ('2d');

2. Load frame picture

Load all frame images using JavaScript and store them in an array.

const frames = [];
const frameCount = 10; // Suppose there are 10 framesfor (let i = 1; i <= frameCount; i++) {
    const img = new Image();
     = `frame${i}.png`;
    (img);
}

3. Draw frame animation

userequestAnimationFrameFunctions implement high-performance frame-by-frame drawing.

let currentFrame = 0;
function drawFrame() {
    (0, 0, , ); // Clear the previous frame    (frames[currentFrame], 0, 0);
    currentFrame = (currentFrame + 1) % ;
    requestAnimationFrame(drawFrame);
}
requestAnimationFrame(drawFrame);

4. SVG animation

SVG animation can be implemented through SMIL and CSS, and is suitable for frame animation of vector graphics.

1. Use SMIL

<svg width="100" height="100">
    <image xlink:href="" rel="external nofollow"  width="100" height="100">
        <animate attributeName="xlink:href"
                 values=";;;"
                 dur="1s" repeatCount="indefinite"/>
    </image>
</svg>

5. WebGL

WebGL provides higher performance drawing capabilities for scenes that require complex 3D animations and high-performance 2D animations.

1. Initialize WebGL

<canvas  width="500" height="500"></canvas>

const canvas = ('webglCanvas');
const gl = ('webgl');

2. Loading and binding textures

const texture = ();
(gl.TEXTURE_2D, texture);
// Loading texture image code

3. Render frame animation

function render() {
    (gl.COLOR_BUFFER_BIT);
    // Draw the current frame code briefly    requestAnimationFrame(render);
}
requestAnimationFrame(render);

in conclusion

There are many ways to implement sequence frame animation at the front end. The choice of the appropriate method depends on the specific animation requirements and project complexity.

For simple animations, CSS animation and JavaScript control can be used; for complex and high-performance animations, Canvas, SVG and WebGL are better choices. I hope that through the introduction of this article, it can help you better understand and implement front-end sequence frame animation.

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