彩票走势图

通常，将JavaScript图表另存为图片是一个非常复杂的过程，但amCharts的JavaScript/HTML5 Charts可以轻松的将图表另存为图片，下面列举了详细的操作步骤。

1、首先下载

2、包括canvg.js, rbgcolor.js, amcharts.js以及以下扩展：

/*

      * Export.js - AmCharts to PNG

       * Benjamin Maertz (tetra1337@gmail.com)

   *

     * Requires:    rgbcolor.js - //www.phpied.com/rgb-color-parser-in-javascript/

     *                 canvg.js - //code.google.com/p/canvg/

     *                amcharts.js - //www.amcharts.com/download

      */

      

     // Lookup for required libs

     if ( typeof(AmCharts) === 'undefined' || typeof(canvg) === 'undefined' || typeof(RGBColor) === 'undefined' ) {

         throw('Woup smth is wrong you might review that //www.amcharts.com/forum/viewtopic.php?id=11001');

   }

     

     // Define custom util

   AmCharts.getExport = function(anything) {

       /*

      ** PRIVATE FUNCTIONS

      */

      

     // Word around until somebody found out how to cover that



     function removeImages(svg) {

           var startStr    = '<image';

           var stopStr        = '</image>';

            var start        = svg.indexOf(startStr);

          var stop        = svg.indexOf(stopStr);

           var match        = '';

    

            // Recursion

           if ( start != -1 && stop != -1 ) {

               svg = removeImages(svg.slice(0,start) + svg.slice(stop + stopStr.length,svg.length));

          }

         return svg;

       };

    

    // Senseless function to handle any input

      function gatherAnything(anything,inside) {

         switch(toString.call(anything)) {

              case '[object String]':

                   if ( document.getElementById(anything) ) {

                       anything = inside?document.getElementById(anything):new Array(document.getElementById(anything));

                   }

                 break;

               case '[object Array]':

                   for ( var i=0;i<anything.length;i++) {

                       anything[i] = gatherAnything(anything[i],true);

                  }

                  break;

    

              case '[object XULElement]':

                   anything = inside?anything:new Array(anything);

                  break;

  

              case '[object HTMLDivElement]':

                  anything = inside?anything:new Array(anything);
                break;

    

             default:

                   anything = new Array();

                  for ( var i=0;i<AmCharts.charts.length;i++) {

                       anything.push(AmCharts.charts[i].div);

                   }

                  break;

            }

            return anything;

       }

    

      /*

        ** varibales VARIABLES!!!

        */

        var chartContainer    = gatherAnything(anything);

        var chartImages        = [];

       var canvgOptions    = {

           ignoreAnimation    :    true,

            ignoreMouse        :    true,

           ignoreClear        :    true,

            ignoreDimensions:    true,

            offsetX            :    0,

           offsetY            :    0

      };

     

       /*

      ** Loop, generate, offer

       */

  

      // Loop through given container

       for(var i1=0;i1<chartContainer.length;i1++) {

           var canvas        = document.createElement('canvas');

          var context        = canvas.getContext('2d');

           var svgs        = chartContainer[i1].getElementsByTagName('svg');

            var image        = new Image();

           var heightCounter = 0;

  
          // Set dimensions, background color to the canvas

         canvas.width    = chartContainer[i1].offsetWidth;

          canvas.height    = chartContainer[i1].offsetHeight;

           context.fillStyle = '#FFFFFF';

          context.fillRect(0,0,canvas.width,canvas.height);

    

         // Loop through all svgs within the container

          for(var i2=0;i2<svgs.length;i2++) {

             var wrapper        = svgs[i2].parentNode;

             var clone        = svgs[i2].cloneNode(true);

            var cloneDiv    = document.createElement('div');

              var offsets        = {

                 x:    wrapper.style.left.slice(0,-2) || 0,

                   y:    wrapper.style.top.slice(0,-2) || 0,

                 height:    wrapper.offsetHeight,

                 width:    wrapper.offsetWidth

              };

   

             // Remove the style and append the clone to the div to receive the full SVG data

             clone.setAttribute('style','');

             cloneDiv.appendChild(clone);

                innerHTML = removeImages(cloneDiv.innerHTML); // without imagery

     

                // Apply parent offset

              if ( offsets.y == 0 ) {

                    offsets.y = heightCounter;

                  heightCounter += offsets.height;

               }

    

              canvgOptions.offsetX = offsets.x;

               canvgOptions.offsetY = offsets.y;

    

               // Some magic beyond the scenes...

               canvg(canvas,innerHTML,canvgOptions);

           }

     

           // Get the final data URL and throw throwat image to the array

           image.src = canvas.toDataURL();

           chartImages.push(image);

       }

     

      // Return DAT IMAGESS!!!!

      return chartImages

   }

3、执行以下扩展

     AmCharts.getExport(); // Returns all charts in the global AmCharts instance

    AmCharts.getExport(<id or element or array of those>) // Returns all charts within the given container

Stockchart导出图片实例：

如果你想试用amCharts的JS图表，可以在这里下载JavaScript/HTML5 Charts、下载Javascript/HTML5 Stock Chart