纯js实现360度旋转预览图片特效

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纯js实现360度旋转预览图片特效
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    插件介绍

    这是一款纯js实现360度旋转预览图片特效。该js特效仅使用120行代码,即可实现通过滑块、或鼠标手动360度旋转图片,以及自动360度旋转图片的效果。

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    时间:2019-06-17
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简要教程

这是一款纯js实现360度旋转预览图片特效。该js特效仅使用120行代码,即可实现通过滑块、或鼠标手动360度旋转图片,以及自动360度旋转图片的效果。

使用方法

HTML结构
import Rolldate from 'rolldate'
new Rolldate({
  el:'#date'
})
                
commonJS
lt;div class="tabs"gt;
  lt;input type="radio" name="tabs" id="sol1" checked="checked"/gt;
  lt;label for="sol1"gt;Rangelt;/labelgt;
  lt;div class="tab"gt;
    lt;div class="frame" id="frame1"gt;lt;/divgt;
    lt;input type="range" id="slider" min="0" max="34" step="1" value="0"/gt;
  lt;/divgt;
  lt;input type="radio" name="tabs" id="sol2"/gt;
  lt;label for="sol2"gt;Drag / Swipelt;/labelgt;
  lt;div class="tab"gt;
    lt;div class="frame" id="frame2"gt;lt;/divgt;
  lt;/divgt;
  lt;input type="radio" name="tabs" id="sol3"/gt;
  lt;label for="sol3"gt;Canvaslt;/labelgt;
  lt;div class="tab"gt;
    lt;canvas class="frame" id="frame3"gt;lt;/canvasgt;
  lt;/divgt;
lt;/divgt;
lt;div id="overlay"gt;Loading...lt;/divgt;
                
CSS样式
body {
  margin: 0;
  padding: 0;
  font-size: .8em;
  font-family: 'Open Sans', sans-serif;
  overflow: hidden;
}
body .tabs {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 480px;
  height: 351px;
}
body .tabs label {
  cursor: pointer;
  border-radius: 4px;
}
body .tabs input[name="tabs"] {
  display: none;
}
body .tabs input[name="tabs"]:checked + label {
  background: #44abda;
  color: #fff;
}
body .tabs input[name="tabs"]:checked + label + .tab {
  display: block;
}
body .tabs label {
  display: inline-block;
  width: 33.3333%;
  float: left;
  height: 24px;
  line-height: 24px;
  text-align: center;
}
body .tabs .tab {
  display: none;
  position: absolute;
  width: 100%;
  height: 327px;
  top: 24px;
  text-align: center;
}
body .tabs .tab .frame {
  width: 100%;
  height: 100%;
}
body .tabs .tab #slider {
  width: calc(100% - 80px);
}
body #overlay {
  position: absolute;
  width: 100%;
  height: calc(100% - 20px);
  background: rgba(0, 0, 0, 0.3);
  text-align: center;
  color: #fff;
  font-size: 1.1em;
  padding-top: 20px;
}
                
javascript
let frame1 = document.getElementById('frame1'),
    frame2 = document.getElementById('frame2'),
    frame3 = document.getElementById('frame3'),
    labels = document.querySelectorAll('label'),
    ctx = frame3.getContext('2d'),
    slider = document.getElementById('slider'),
    frameWidth = 480,
    frameHeight = 327,
    activeFrame = 0,
    frames = 34,
    xStart = null,
    s2Settings = {
        sensitivity: 40
    },
    s3Settings = {
        fps: 20,
        reverse: false
    },
    now, delta, then = Date.now(),
    interval = 1000 / s3Settings.fps,    
    runCanvas = false;

let gui = new dat.GUI(),
    s2 = gui.addFolder('Drag / Swipe'),
    s3 = gui.addFolder('Canvas');

s2.add(s2Settings, "sensitivity", 10, 80, 1);
s3.add(s3Settings, "fps", 1, 60, 1).onChange(() =gt; {interval = 1000 / s3Settings.fps;});
s3.add(s3Settings, "reverse");

s2.open();
s3.open();

let sprite = new Image();
sprite.onload = function() {
    frame1.style.background = frame2.style.background = `url(${sprite.src})`;
    document.getElementById('overlay').style.display = 'none';
    
    solution1(); //input range
    solution2(); // drag / swipe
    solution3(); // canvas
    
    labels.forEach(function(element) {
      element.addEventListener('click', function() {
          runCanvas = false;
          if(this.getAttribute('for') == "sol3")
              runCanvas = true;
      });
    });
};
sprite.src = 'https://serving.photos.photobox.com/\
55967562d176c08ff2d7e23195f94e704faa7feede75617ac5\
905d8dca9295f1a547077a.jpg';

function solution1() {    
    slider.addEventListener("input", function() {
        activeFrame = parseInt(this.value);
        frame1.style.backgroundPositionX = `-${activeFrame * frameWidth}px`;
    });
}

function solution2() {
    frame2.addEventListener('touchstart', (e) =gt; {
        xStart = e.touches ? e.touches[0].clientX : e.clientX;
    });
    frame2.addEventListener('mousedown', (e) =gt; {
        xStart = e.touches ? e.touches[0].clientX : e.clientX;
    });
    frame2.addEventListener('touchend', () =gt; { xStart = null; });
    frame2.addEventListener('mouseup', () =gt; { xStart = null; });
    frame2.addEventListener("mousemove", move);
    frame2.addEventListener("touchmove", move);
}

function move(e) {
    if(!xStart)
        return;
    
    let xEnd = e.touches ? e.touches[0].clientX : e.clientX;
    if (xStart - xEnd gt; .5 * frameWidth / (10 + s2Settings.sensitivity)) {
        activeFrame++;
        if(activeFrame gt; frames)
            activeFrame = 0;
        frame2.style.backgroundPositionX = `${activeFrame * frameWidth}px`;
        xStart = xEnd;
    } else if(xEnd - xStart gt; .5 * frameWidth / (10 + s2Settings.sensitivity)) {
        activeFrame--;
        if(activeFrame lt; 0)
            activeFrame = frames;
        frame2.style.backgroundPositionX = `${activeFrame * frameWidth}px`;
        xStart = xEnd;
    }
}

function solution3() {
    frame3.width = frameWidth;
    frame3.height = frameHeight;
    animate();
}

function animate() { 
    now = Date.now();
    delta = now - then;
    
    if(runCanvas && delta gt; interval) {
        if(activeFrame gt; frames)
            activeFrame = 0;
        else if(activeFrame lt; 0)
            activeFrame = frames;

        ctx.drawImage(
            sprite, activeFrame * frameWidth, 0, frameWidth, frameHeight, 
            0, 0, frameWidth, frameHeight
        );
        
        activeFrame += (s3Settings.reverse) ? -1 : 1;
        then = now - (delta % interval);
    }
    window.requestAnimationFrame(animate);
}
                

该纯js实现360度旋转预览图片特效的codepen网址为:https://codepen.io/_massimo/pen/zVYVNb