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          純JavaScript實(shí)現(xiàn)HTML5 Canvas 6種特效濾鏡

          者:前端Q

          轉(zhuǎn)發(fā)鏈接:https://mp.weixin.qq.com/s/ewFfXptccFs5KvjUINLGbQ

          前端

          小試牛刀,實(shí)現(xiàn)了六款簡(jiǎn)單常見(jiàn)HTML5 Canvas特效濾鏡,并且封裝成一個(gè)純JavaScript可調(diào)用的API文件gloomyfishfilter.js。支持的特效濾鏡分別為:

          1.反色

          2.灰色調(diào)

          3.模糊

          4.浮雕

          5.雕刻

          6.合理

          濾鏡原理解釋:

          2.灰色調(diào):獲取一個(gè)預(yù)期點(diǎn)RGB值r,g,b則新的RGB值

          newr =(r * 0.272)+(g * 0.534)+(b * 0.131);

          newg =(r * 0.349)+(g * 0.686)+(b * 0.168);

          newb =(r * 0.393)+(g * 0.769)+(b * 0.189);

          3.模糊:基于一個(gè)5 * 5的卷積核

          4.浮雕與雕刻:

          根據(jù)當(dāng)前預(yù)期的前一個(gè)預(yù)期RGB值與它的后一個(gè)重新的RGB值之差再加上128

          5.總體:模擬了物體在鏡子中與之對(duì)應(yīng)的效果。

          雜項(xiàng)準(zhǔn)備

          1、如何獲取Canvas 2d context對(duì)象

          var canvas = document.getElementById("target");
          
          canvas.width = source.clientWidth;
          
          canvas.height = source.clientHeight;
          
          **if**(!canvas.getContext) {
          
             console.log("Canvas not supported. Please install a HTML5compatible browser.");
          
             **return**;
          
          }
          
          // get 2D context of canvas and draw image
          
          tempContext = canvas.getContext("2d");

          2、如何添加一個(gè)DOM img對(duì)象到Canvas對(duì)象中

          var source = document.getElementById("source");
          
          tempContext.drawImage(source, 0, 0, canvas.width,canvas.height);

          3、如何從Canvas對(duì)象中獲取預(yù)定數(shù)據(jù)

          var canvas = document.getElementById("target");
          
          var len = canvas.width * canvas.height * 4;
          
          var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
          
          var binaryData = canvasData.data;

          4、如何對(duì)DOM對(duì)象實(shí)現(xiàn)鼠標(biāo)ClickEvent綁定

          function bindButtonEvent(element, type, handler) 
          {  
          
          if(element.addEventListener){ 
          
                element.addEventListener(type, handler,**false**); 
          
             }else{ 
          
                element.attachEvent('on'+type, handler);// for IE6,7,8
          
             } 
          
          }

          5、如何調(diào)用實(shí)現(xiàn)的gfilter API完成濾鏡功能

          <scriptsrc=*"gloomyfishfilter.js"*></script> //導(dǎo)入API文件
          
          gfilter.colorInvertProcess(binaryData, len); //調(diào)用 API

          6、瀏覽器支持:IE,F(xiàn)F,Chrome上測(cè)試通過(guò),其中IE上支持通過(guò)以下標(biāo)簽實(shí)現(xiàn):

          <meta http-equiv="X-UA-Compatible"*content=*"chrome=IE8"> 


          效果演示:

          應(yīng)用程序源代碼:

          CSS部分:

          #svgContainer {
            width:800px;
            height:600px;
            background-color:#EEEEEE;
          }
          
          #sourceDiv { float: left; border: 2px solid blue} 
          #targetDiv { float: right;border: 2px solid red}

          filter1.html中HTML源代碼:

          <!DOCTYPE html>
          <html>
          <head>
          <meta http-equiv="X-UA-Compatible" content="chrome=IE8">
          <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
          <title>Canvas Filter Demo</title>
          <link href="default.css" rel="stylesheet" />
          <script src="gloomyfishfilter.js"></scrip>
          </head>
          <body>
            <h1>HTML Canvas Image Process - By Gloomy Fish</h1>
            <div id="svgContainer">
              <div id="sourceDiv">
                <img id="source" src="../test.png" />
              </div>
              <div id="targetDiv">
                <canvas id="target"></canvas>
              </div>
            </div>
            <div id="btn-group">
              <button type="button" id="invert-button">反色</button>
              <button type="button" id="adjust-button">灰色調(diào)</button>
              <button type="button" id="blur-button">模糊</button>
              <button type="button" id="relief-button">浮雕</button>
              <button type="button" id="diaoke-button">雕刻</button>
              <button type="button" id="mirror-button">鏡像</button>
            </div>
          </body>
          </html>

          filter1.html中JavaScript源代碼:

          var tempContext = null; // global variable 2d context
              window.onload = function() {
                var source = document.getElementById("source");
                var canvas = document.getElementById("target");
                canvas.width = source.clientWidth;
                canvas.height = source.clientHeight;
          
                if (!canvas.getContext) {
                    console.log("Canvas not supported. Please install a HTML5 compatible browser.");
                    return;
                }
          
                // get 2D context of canvas and draw image
                tempContext = canvas.getContext("2d");
                tempContext.drawImage(source, 0, 0, canvas.width, canvas.height);
          
                    // initialization actions
                    var inButton = document.getElementById("invert-button");
                    var adButton = document.getElementById("adjust-button");
                    var blurButton = document.getElementById("blur-button");
                    var reButton = document.getElementById("relief-button");
                    var dkButton = document.getElementById("diaoke-button");
                    var mirrorButton = document.getElementById("mirror-button");
          
                    // bind mouse click event
                    bindButtonEvent(inButton, "click", invertColor);
                    bindButtonEvent(adButton, "click", adjustColor);
                    bindButtonEvent(blurButton, "click", blurImage);
                    bindButtonEvent(reButton, "click", fudiaoImage);
                    bindButtonEvent(dkButton, "click", kediaoImage);
                    bindButtonEvent(mirrorButton, "click", mirrorImage);
              }
          
              function bindButtonEvent(element, type, handler)  
          {  
                if(element.addEventListener) {  
                   element.addEventListener(type, handler, false);  
                } else {  
                   element.attachEvent('on'+type, handler); // for IE6,7,8
                }  
              }  
          
              function invertColor() {
                var canvas = document.getElementById("target");
                var len = canvas.width * canvas.height * 4;
                var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
                var binaryData = canvasData.data;
          
                    // Processing all the pixels
                    gfilter.colorInvertProcess(binaryData, len);
          
                    // Copying back canvas data to canvas
                    tempContext.putImageData(canvasData, 0, 0);
              }
          
              function adjustColor() {
                var canvas = document.getElementById("target");
                var len = canvas.width * canvas.height * 4;
                var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
                    var binaryData = canvasData.data;
          
                    // Processing all the pixels
                    gfilter.colorAdjustProcess(binaryData, len);
          
                    // Copying back canvas data to canvas
                    tempContext.putImageData(canvasData, 0, 0);
              }
          
              function blurImage() 
          {
                var canvas = document.getElementById("target");
                var len = canvas.width * canvas.height * 4;
                var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
          
                    // Processing all the pixels
                    gfilter.blurProcess(tempContext, canvasData);
          
                    // Copying back canvas data to canvas
                    tempContext.putImageData(canvasData, 0, 0);
              }
          
              function fudiaoImage() 
          {
                var canvas = document.getElementById("target");
                var len = canvas.width * canvas.height * 4;
                var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
          
                    // Processing all the pixels
                    gfilter.reliefProcess(tempContext, canvasData);
          
                    // Copying back canvas data to canvas
                    tempContext.putImageData(canvasData, 0, 0);
              }
          
              function kediaoImage() 
          {
                var canvas = document.getElementById("target");
                var len = canvas.width * canvas.height * 4;
                var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
          
                    // Processing all the pixels
                    gfilter.diaokeProcess(tempContext, canvasData);
          
                    // Copying back canvas data to canvas
                    tempContext.putImageData(canvasData, 0, 0);
              }
          
              function mirrorImage() 
          {
                var canvas = document.getElementById("target");
                var len = canvas.width * canvas.height * 4;
                var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
          
                    // Processing all the pixels
                    gfilter.mirrorProcess(tempContext, canvasData);
          
                    // Copying back canvas data to canvas
                    tempContext.putImageData(canvasData, 0, 0);
              }

          濾鏡源代碼(gloomyfishfilter.js):

          var gfilter = {
              type: "canvas",
              name: "filters",
              author: "zhigang",
              getInfo: function () {
                  return this.author + ' ' + this.type + ' ' + this.name;
              },
          
              /**
               * invert color value of pixel, new pixel = RGB(255-r, 255-g, 255 - b)
               * 
               * @param binaryData - canvas's imagedata.data
               * @param l - length of data (width * height of image data)
               */
             colorInvertProcess: function(binaryData, l) {
              for (var i = 0; i < l; i += 4) {
                    var r = binaryData[i];
                    var g = binaryData[i + 1];
                    var b = binaryData[i + 2];
          
                    binaryData[i] = 255-r;
                    binaryData[i + 1] = 255-g;
                    binaryData[i + 2] = 255-b;
                }
             },
          
             /**
              * adjust color values and make it more darker and gray...
              * 
              * @param binaryData
              * @param l
              */
            colorAdjustProcess: function(binaryData, l) {
              for (var i = 0; i < l; i += 4) {
                    var r = binaryData[i];
                    var g = binaryData[i + 1];
                    var b = binaryData[i + 2];
          
                    binaryData[i] = (r * 0.272) + (g * 0.534) + (b * 0.131);
                    binaryData[i + 1] = (r * 0.349) + (g * 0.686) + (b * 0.168);
                    binaryData[i + 2] = (r * 0.393) + (g * 0.769) + (b * 0.189);
                }
            },
          
            /**
             * deep clone image data of canvas
             * 
             * @param context
             * @param src
             * @returns
             */
            copyImageData: function(context, src)
            {
                var dst = context.createImageData(src.width, src.height);
                dst.data.set(src.data);
                return dst;
            },
          
            /**
             * convolution - keneral size 5*5 - blur effect filter(模糊效果)
             * 
             * @param context
             * @param canvasData
             */
            blurProcess: function(context, canvasData) {
              console.log("Canvas Filter - blur process");
              var tempCanvasData = this.copyImageData(context, canvasData);
              var sumred = 0.0, sumgreen = 0.0, sumblue = 0.0;
              for ( var x = 0; x < tempCanvasData.width; x++) {    
                      for ( var y = 0; y < tempCanvasData.height; y++) {    
          
                          // Index of the pixel in the array    
                          var idx = (x + y * tempCanvasData.width) * 4;       
                          for(var subCol=-2; subCol<=2; subCol++) {
                            var colOff = subCol + x;
                            if(colOff <0 || colOff >= tempCanvasData.width) {
                              colOff = 0;
                            }
                            for(var subRow=-2; subRow<=2; subRow++) {
                              var rowOff = subRow + y;
                              if(rowOff < 0 || rowOff >= tempCanvasData.height) {
                                rowOff = 0;
                              }
                              var idx2 = (colOff + rowOff * tempCanvasData.width) * 4;    
                                var r = tempCanvasData.data[idx2 + 0];    
                                var g = tempCanvasData.data[idx2 + 1];    
                                var b = tempCanvasData.data[idx2 + 2];
                                sumred += r;
                                sumgreen += g;
                                sumblue += b;
                            }
                          }
          
                          // calculate new RGB value
                          var nr = (sumred / 25.0);
                          var ng = (sumgreen / 25.0);
                          var nb = (sumblue / 25.0);
          
                          // clear previous for next pixel point
                          sumred = 0.0;
                          sumgreen = 0.0;
                          sumblue = 0.0;
          
                          // assign new pixel value    
                          canvasData.data[idx + 0] = nr; // Red channel    
                          canvasData.data[idx + 1] = ng; // Green channel    
                          canvasData.data[idx + 2] = nb; // Blue channel    
                          canvasData.data[idx + 3] = 255; // Alpha channel    
                      }
              }
            },
          
            /**
             * after pixel value - before pixel value + 128
             * 浮雕效果
             */
            reliefProcess: function(context, canvasData) {
              console.log("Canvas Filter - relief process");
              var tempCanvasData = this.copyImageData(context, canvasData);
              for ( var x = 1; x < tempCanvasData.width-1; x++) 
              {    
                      for ( var y = 1; y < tempCanvasData.height-1; y++)
                      {    
          
                          // Index of the pixel in the array    
                          var idx = (x + y * tempCanvasData.width) * 4;       
                  var bidx = ((x-1) + y * tempCanvasData.width) * 4;
                  var aidx = ((x+1) + y * tempCanvasData.width) * 4;
          
                          // calculate new RGB value
                          var nr = tempCanvasData.data[aidx + 0] - tempCanvasData.data[bidx + 0] + 128;
                          var ng = tempCanvasData.data[aidx + 1] - tempCanvasData.data[bidx + 1] + 128;
                          var nb = tempCanvasData.data[aidx + 2] - tempCanvasData.data[bidx + 2] + 128;
                          nr = (nr < 0) ? 0 : ((nr >255) ? 255 : nr);
                          ng = (ng < 0) ? 0 : ((ng >255) ? 255 : ng);
                          nb = (nb < 0) ? 0 : ((nb >255) ? 255 : nb);
          
                          // assign new pixel value    
                          canvasData.data[idx + 0] = nr; // Red channel    
                          canvasData.data[idx + 1] = ng; // Green channel    
                          canvasData.data[idx + 2] = nb; // Blue channel    
                          canvasData.data[idx + 3] = 255; // Alpha channel    
                      }
              }
            },
          
            /**
             *   before pixel value - after pixel value + 128
             *  雕刻效果
             * 
             * @param canvasData
             */
            diaokeProcess: function(context, canvasData) {
              console.log("Canvas Filter - process");
              var tempCanvasData = this.copyImageData(context, canvasData);
              for ( var x = 1; x < tempCanvasData.width-1; x++) 
              {    
                      for ( var y = 1; y < tempCanvasData.height-1; y++)
                      {    
          
                          // Index of the pixel in the array    
                          var idx = (x + y * tempCanvasData.width) * 4;       
                  var bidx = ((x-1) + y * tempCanvasData.width) * 4;
                  var aidx = ((x+1) + y * tempCanvasData.width) * 4;
          
                          // calculate new RGB value
                          var nr = tempCanvasData.data[bidx + 0] - tempCanvasData.data[aidx + 0] + 128;
                          var ng = tempCanvasData.data[bidx + 1] - tempCanvasData.data[aidx + 1] + 128;
                          var nb = tempCanvasData.data[bidx + 2] - tempCanvasData.data[aidx + 2] + 128;
                          nr = (nr < 0) ? 0 : ((nr >255) ? 255 : nr);
                          ng = (ng < 0) ? 0 : ((ng >255) ? 255 : ng);
                          nb = (nb < 0) ? 0 : ((nb >255) ? 255 : nb);
          
                          // assign new pixel value    
                          canvasData.data[idx + 0] = nr; // Red channel    
                          canvasData.data[idx + 1] = ng; // Green channel    
                          canvasData.data[idx + 2] = nb; // Blue channel    
                          canvasData.data[idx + 3] = 255; // Alpha channel    
                      }
              }
            },
          
            /**
             * mirror reflect
             * 
             * @param context
             * @param canvasData
             */
            mirrorProcess : function(context, canvasData) {
              console.log("Canvas Filter - process");
              var tempCanvasData = this.copyImageData(context, canvasData);
              for ( var x = 0; x < tempCanvasData.width; x++) // column
              {    
                      for ( var y = 0; y < tempCanvasData.height; y++) // row
                      {    
          
                          // Index of the pixel in the array    
                          var idx = (x + y * tempCanvasData.width) * 4;       
                  var midx = (((tempCanvasData.width -1) - x) + y * tempCanvasData.width) * 4;
          
                          // assign new pixel value    
                          canvasData.data[midx + 0] = tempCanvasData.data[idx + 0]; // Red channel    
                          canvasData.data[midx + 1] = tempCanvasData.data[idx + 1]; ; // Green channel    
                          canvasData.data[midx + 2] = tempCanvasData.data[idx + 2]; ; // Blue channel    
                          canvasData.data[midx + 3] = 255; // Alpha channel    
                      }
              }
            },
          };

          總結(jié)

          感謝閱讀,如果你覺(jué)得我今天分享的內(nèi)容,不錯(cuò),請(qǐng)點(diǎn)一個(gè)贊,謝謝!!

          家好,今天給大家介紹一款,canvas實(shí)現(xiàn)的炫酷文字特效html頁(yè)面源碼(圖1)。送給大家哦,獲取方式在本文末尾。

          圖1

          動(dòng)畫(huà)預(yù)覽如下(圖2)

          圖2

          代碼完整,需要的朋友可以下載學(xué)習(xí)(圖3)

          圖3

          本源碼編碼:10155,需要的朋友,點(diǎn)擊下面的鏈接后,搜索10155,即可獲取。

          就愛(ài)UI - 分享UI設(shè)計(jì)的點(diǎn)點(diǎn)滴滴

          起程序員,外行的人對(duì)程序員古板的印象是格子衫、雙肩包、黑眼睛框、不懂浪漫的指南。但實(shí)際上,程序員也是很浪費(fèi)的!

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          我們一起看下其中幾個(gè),更多請(qǐng)下載查看。

          01 滿滿愛(ài)心

          02 相冊(cè)動(dòng)畫(huà)



          03 戀愛(ài)日志

          04 戀愛(ài)PPT

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          表白的套路很多,但都少不了送花送禮物,作為一個(gè)程序員,搞不懂現(xiàn)在流行的泡泡機(jī)、小豬、重力感應(yīng)車(chē)等玩具,也不想去讓朋友們?nèi)ニ湾X(qián)炫耀,畢竟真情才重要,錢(qián)就物質(zhì)了。我能給各位單身粉絲們做的可能就只有分享幾個(gè)表白代碼了,在電腦上敲上幾行代碼,讓她在郁悶的周一得到一個(gè)大大的驚喜,很簡(jiǎn)單,一看就會(huì),如果現(xiàn)在用不到也不要緊,先收藏起來(lái),反正這樣的節(jié)日很多,以后用的時(shí)候能找到。

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