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3D HTML5 Logo标志 超炫酷旋转特效

作者:html5tricks  发布日期:2014-08-18 21:00:21
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  • 今天又要为大家带来一款超酷的HTML5 Canvas 3D动画特效,是一款可以旋转的HTML5 Logo标志。画面上一共有两块可旋转的区域,第一是可旋转的背景,第二则是可旋转的Logo标志。Logo标志在旋转的时候还有3D的视觉效果,这一切我们都是在canvas上实现的。具体演示和实现过程可以看下文。

    3d-html5-logo-animation

    你也可以在这里查看在线演示

    下面我们来简单分析一下实现这款3D动画的过程及其部分核心代码,主要由HTML代码以及Javascript代码组成。

    HTML代码:

    <canvas id="canvas" style="background-color:#ddd"></canvas>

    非常简单,仅仅是构造了一个canvas容器,接下来的3D动画,包括旋转的特效都将在这里绘制和实现。

    Javascript代码:

    function onloadHandler()
    {
       var canvas = document.getElementById('canvas');
       canvas.width = window.innerWidth;
       canvas.height = window.innerHeight;
       var k3dmain = new K3D.Controller(canvas, true);
       
       // generate 3D objects
       
       var obj1 = new K3D.K3DObject();
       with (obj1)
       {
          drawmode = "solid";
          shademode = "lightsource";
          sortmode = "unsorted";
          addphi = -0.5;
          abouty = -90;
          perslevel = 1000;
          init(
             [{x:-80,y:180,z:0},{x:0,y:180,z:-80},{x:0,y:0,z:-80},{x:-80,y:20,z:0},{x:-50,y:150,z:-30},{x:0,y:150,z:-80},{x:0,y:130,z:-80},{x:-30,y:130,z:-50},{x:-28,y:110,z:-52},{x:0,y:110,z:-80},{x:0,y:90,z:-80},{x:-45,y:90,z:-35},{x:-44,y:80,z:-36},{x:-25,y:80,z:-55},{x:-22,y:66,z:-58},{x:0,y:60,z:-80},{x:0,y:40,z:-80},{x:-40,y:50,z:-40}],
             [],
             [{color:[227,76,38],vertices:[0,1,2,3,0]},{color:[235,235,235],vertices:[4,5,6,7,8,9,10,11,4]},{color:[235,235,235],vertices:[12,13,14,15,16,17,12]}]
          );
       }
       k3dmain.addK3DObject(obj1);
       
       var obj2 = new K3D.K3DObject();
       with (obj2)
       {
          drawmode = "solid";
          shademode = "lightsource";
          sortmode = "unsorted";
          addphi = -0.5;
          abouty = -90;
          perslevel = 1000;
          init(
             [{x:0,y:180,z:-80},{x:80,y:180,z:0},{x:80,y:20,z:0},{x:0,y:0,z:-80},{x:0,y:165,z:-80},{x:68,y:165,z:-12},{x:55,y:35,z:-25},{x:0,y:20,z:-80},{x:0,y:150,z:-80},{x:50,y:150,z:-30},{x:47,y:130,z:-33},{x:0,y:130,z:-80},{x:0,y:110,z:-80},{x:45,y:110,z:-35},{x:40,y:50,z:-40},{x:0,y:40,z:-80},{x:0,y:60,z:-80},{x:20,y:66,z:-60},{x:23,y:90,z:-57},{x:0,y:90,z:-80}],
             [],
             [{color:[227,76,38],vertices:[0,1,2,3,0]},{color:[240,101,41],vertices:[4,5,6,7,4]},{color:[235,235,235],vertices:[8,9,10,11,8]},{color:[235,235,235],vertices:[12,13,14,15,16,17,18,19,12]}]
          );
       }
       k3dmain.addK3DObject(obj2);
       
       var obj3 = new K3D.K3DObject();
       with (obj3)
       {
          drawmode = "solid";
          shademode = "lightsource";
          sortmode = "unsorted";
          addphi = -0.5;
          abouty = -90;
          perslevel = 1000;
          init(
             [{x:80,y:180,z:0},{x:0,y:180,z:80},{x:0,y:0,z:80},{x:80,y:20,z:0},{x:50,y:150,z:30},{x:0,y:150,z:80},{x:0,y:130,z:80},{x:30,y:130,z:50},{x:28,y:110,z:52},{x:0,y:110,z:80},{x:0,y:90,z:80},{x:45,y:90,z:35},{x:44,y:80,z:36},{x:25,y:80,z:55},{x:22,y:66,z:58},{x:0,y:60,z:80},{x:0,y:40,z:80},{x:40,y:50,z:40}],
             [],
             [{color:[227,76,38],vertices:[0,1,2,3,0]},{color:[235,235,235],vertices:[4,5,6,7,8,9,10,11,4]},{color:[235,235,235],vertices:[12,13,14,15,16,17,12]}]
          );
       }
       k3dmain.addK3DObject(obj3);
       
       var obj4 = new K3D.K3DObject();
       with (obj4)
       {
          drawmode = "solid";
          shademode = "lightsource";
          sortmode = "unsorted";
          addphi = -0.5;
          abouty = -90;
          perslevel = 1000;
          init(
             [{x:0,y:180,z:80},{x:-80,y:180,z:0},{x:-80,y:20,z:0},{x:0,y:0,z:80},{x:0,y:165,z:80},{x:-68,y:165,z:12},{x:-55,y:35,z:25},{x:0,y:20,z:80},{x:0,y:150,z:80},{x:-50,y:150,z:30},{x:-47,y:130,z:33},{x:0,y:130,z:80},{x:0,y:110,z:80},{x:-45,y:110,z:35},{x:-40,y:50,z:40},{x:0,y:40,z:80},{x:0,y:60,z:80},{x:-20,y:66,z:60},{x:-23,y:90,z:57},{x:0,y:90,z:80}],
             [],
             [{color:[227,76,38],vertices:[0,1,2,3,0]},{color:[240,101,41],vertices:[4,5,6,7,4]},{color:[235,235,235],vertices:[8,9,10,11,8]},{color:[235,235,235],vertices:[12,13,14,15,16,17,18,19,12]}]
          );
       }
       k3dmain.addK3DObject(obj4);
       
       var objBase = new K3D.K3DObject();
       with (objBase)
       {
          drawmode = "solid";
          shademode = "lightsource";
          sortmode = "unsorted";
          addphi = -0.5;
          abouty = -90;
          perslevel = 1000;
          init(
             [{x:0,y:0,z:-80},{x:-80,y:20,z:0},{x:0,y:0,z:80},{x:80,y:20,z:0}],
             [],
             [{color:[227,76,38],vertices:[0,2,1,0]},{color:[227,76,38],vertices:[0,3,2,0]}]
          );
       }
       k3dmain.addK3DObject(objBase);
       
       var objHtml = new K3D.K3DObject();
       with (objHtml)
       {
          drawmode = "solid";
          shademode = "lightsource";
          //sortmode = "unsorted";
          color = [64,64,64];
          doublesided = true;
          addphi = -0.5;
          abouty = 100;
          scale = 0.75;
          perslevel = 1000;
          init(
             [{x:-80,y:40,z:0},{x:-70,y:40,z:0},{x:-70,y:30,z:0},{x:-60,y:30,z:0},{x:-60,y:40,z:0},{x:-50,y:40,z:0},{x:-50,y:10,z:0},{x:-60,y:10,z:0},{x:-60,y:20,z:0},{x:-70,y:20,z:0},{x:-70,y:10,z:0},{x:-80,y:10,z:0},{x:-40,y:40,z:0},{x:-10,y:40,z:0},{x:-10,y:30,z:0},{x:-20,y:30,z:0},{x:-20,y:10,z:0},{x:-30,y:10,z:0},{x:-30,y:30,z:0},{x:-40,y:30,z:0},{x:0,y:40,z:0},{x:10,y:40,z:0},{x:20,y:30,z:0},{x:30,y:40,z:0},{x:40,y:40,z:0},{x:40,y:10,z:0},{x:30,y:10,z:0},{x:30,y:30,z:0},{x:20,y:20,z:0},{x:10,y:30,z:0},{x:10,y:10,z:0},{x:0,y:10,z:0},{x:50,y:40,z:0},{x:60,y:40,z:0},{x:60,y:20,z:0},{x:80,y:20,z:0},{x:80,y:10,z:0},{x:50,y:10,z:0}],
             [],
             [{vertices:[0,1,2,3,4,5,6,7,8,9,10,11,0]},{vertices:[12,13,14,15,16,17,18,19,12]},{vertices:[20,21,22,23,24,25,26,27,28,29,30,31,20]},{vertices:[32,33,34,35,36,37,32]}]
          );
       }
       k3dmain.addK3DObject(objHtml);
       
       // add render loop callback
       var ctx = canvas.getContext('2d');
       var rotationOffset = 0;
       var len = (canvas.height > canvas.width ? canvas.height : canvas.width) * 0.7;
       k3dmain.clearBackground = false;
       k3dmain.callback = function()
       {
          // manually clear bg - as we want to render some extra goodies
          ctx.clearRect(0, 0, canvas.width, canvas.height);
          
          // draw bg effect before K3D does its 3D rendering
          ctx.save();
          ctx.translate(canvas.width/2, canvas.height/2);
          ctx.rotate(rotationOffset);
          
          // first fill pass - outer rays
          var RAYCOUNT = 24;
          ctx.fillStyle = "#eee";
          ctx.beginPath();
          for (var i=0; i<RAYCOUNT; i++)
          {
             // rotate context
             ctx.rotate(TWOPI / RAYCOUNT);
             ctx.moveTo(0, 0);
             ctx.lineTo(-20, len);
             ctx.lineTo(20, len);
          }
          ctx.closePath();
          ctx.fill();
          // second fill pass - inner rays
          ctx.fillStyle = "#fff";
          ctx.beginPath();
          for (var i=0; i<RAYCOUNT; i++)
          {
             // rotate context
             ctx.rotate(TWOPI / RAYCOUNT);
             ctx.moveTo(0, 0);
             ctx.lineTo(-15, len);
             ctx.lineTo(15, len);
          }
          ctx.closePath();
          ctx.fill();
          ctx.restore();
          rotationOffset += 0.005;
          
          // apply user interaction to rotation
          for (var i=0, objs=k3dmain.objects; i<objs.length; i++)
          {
             objs[i].ophi += targetRotationX;
          }
          
          if (targetRotationX > -0.5) targetRotationX -= 0.05;
          else if (targetRotationX < -0.55) targetRotationX += 0.05;
          if (targetRotationX > -0.55 && targetRotationX < -0.5) targetRotationX = -0.5;
       };
       
       // start demo loop
       k3dmain.paused = true;
       setInterval(function(){k3dmain.tick()}, 1000/60);
    }

    这部分代码是整个动画的初始化代码,其中我们利用了k3d的脚本库,所以你需要在项目中引用它,关于k3d,你可以在最后的源代码中找到它。

    <script src="k3d-min.js"></script>

    下面是一些鼠标事件,你可以拖动鼠标来让其旋转,具体代码如下:

    function onDocumentMouseDown( event ) {
    
        event.preventDefault();
        
        document.addEventListener('mousemove', onDocumentMouseMove, false);
        document.addEventListener('mouseup', onDocumentMouseUp, false);
        document.addEventListener('mouseout', onDocumentMouseOut, false);
        
        mouseXOnMouseDown = event.clientX - windowHalfX;
        targetRotationOnMouseDownX = targetRotationX;
        mouseYOnMouseDown = event.clientY - windowHalfY;
        targetRotationOnMouseDownY = targetRotationY;
    }
    
    function onDocumentMouseMove( event )
    {
        mouseX = event.clientX - windowHalfX;
        targetRotationX = targetRotationOnMouseDownX + (mouseX - mouseXOnMouseDown) * 0.02;
        mouseY = event.clientY - windowHalfY;
        targetRotationY = targetRotationOnMouseDownY + (mouseY - mouseYOnMouseDown) * 0.02;
    }
    
    function onDocumentMouseUp( event )
    {
        document.removeEventListener('mousemove', onDocumentMouseMove, false);
        document.removeEventListener('mouseup', onDocumentMouseUp, false);
        document.removeEventListener('mouseout', onDocumentMouseOut, false);
    }
    
    function onDocumentMouseOut( event )
    {
        document.removeEventListener('mousemove', onDocumentMouseMove, false);
        document.removeEventListener('mouseup', onDocumentMouseUp, false);
        document.removeEventListener('mouseout', onDocumentMouseOut, false);
    }
    
    function onDocumentTouchStart( event )
    {
        if (event.touches.length == 1)
        {
            event.preventDefault();
    
            mouseXOnMouseDown = event.touches[0].pageX - windowHalfX;
            targetRotationOnMouseDownX = targetRotationX;
            mouseYOnMouseDown = event.touches[0].pageY - windowHalfY;
            targetRotationOnMouseDownY = targetRotationY;
        }
    }

    好了,一个简单的3D动画实现起来还是有点复杂的,你可以下载源代码来研究学习。源码下载>>

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