canvg処理svg回転png

ソース:https://github.com/canvg/canvg
Include the follwing files in your page:

<script type="text/javascript" src="http://canvg.github.io/canvg/rgbcolor.js">script> 
<script type="text/javascript" src="http://canvg.github.io/canvg/StackBlur.js">script>
<script type="text/javascript" src="http://canvg.github.io/canvg/canvg.js">script> 

Put a canvas on your page

<canvas id="canvas" width="1000px" height="600px">canvas> 

Example canvg cals:

<script type="text/javascript">
window.onload = function() {
  //load '../path/to/your.svg' in the canvas with id = 'canvas'
  canvg('canvas', '../path/to/your.svg')

  //load a svg snippet in the canvas with id = 'drawingArea'
  canvg(document.getElementById('drawingArea'), '')

  //ignore mouse events and animation
  canvg('canvas', 'file.svg', { ignoreMouse: true, ignoreAnimation: true }) 
}
</script>

The third parameter is options:

logs:true=>consosone.logn information

ignoreMouse:true=>ignore mouse events

ignoreAnimation:true=>ignore animation

ignoreDimenions:true=>does not try to resize canvas

ignoreClear:true=>does not clear canvas

offsetX:int=>draws at x offset

offset Y:int=>draws a a y offset

scaleWidth:int=>scales horizontally to width

scaleHeight:int=>scales vertically to height

rendeCallback:function=>will cal the function after the first render is complected

forceRedraw:function=>will cal the function on everry frame,if it returns true,will redraw

useCORS:true=>will atempt to use CORS on margs to not taint canvas

You can canvg without parameters to replace all svg mages on a page.See the example.
The e e is also a built in extension method to the canvas context to draw svgs simiar to the way drawImage works:

var c = document.getElementById('canvas');
var ctx = c.getContext('2d');
ctx.drawSvg(SVG_XML_OR_PATH_TO_SVG, dx, dy, dw, dh);

   canvans svg       ：

//  svgBase64 Png	
/* function getBase64PNG(svgStr,themeSize) {
	  var image = new Image();
	  image.src = svgStr;
	  
      var canvas = document.createElement("canvas");
      canvas.width = 300;
      canvas.height = 300;
      var ctx = canvas.getContext("2d");
      if(themeSize==3){
      	  ctx.drawImage(image, 0, 0);
      }else if(themeSize==2){
	      ctx.drawImage(image, 50, 50);
      }else if(themeSize==1){
      	  ctx.drawImage(image, 100, 100);
      }
      var dataURL = canvas.toDataURL("image/png");
      return dataURL
} */
/**
*  svg Png pngBase64
*/
function getBase64PNG(svgStr,themeSize) {
      var canvas = document.createElement("canvas");
      canvas.width = 300;
      canvas.height = 300;
      var ctx = canvas.getContext("2d");
      if(themeSize==3){
      	  ctx.drawSvg(svgStr, 0, 0, 300, 300);
      }else if(themeSize==2){
	      ctx.drawSvg(svgStr, 50, 50, 200, 200);
      }else if(themeSize==1){
      	  ctx.drawSvg(svgStr, 100, 100, 100, 100);
      }
      var dataURL = canvas.toDataURL("image/png");
      return dataURL
}

<span>	</span>var url="https://www.czxiu.com/assets/z/2017jiehunzheng/15/2f43b42fd833d1e77420a8dae7419000.gif";
<span>	</span>$(document).ready(function() {
       initCavans(url);
    });
<span>	</span>//   canvans
<span>	</span>var cavans;
<span>	</span>function initCavans(pngPath){
<span>		</span>var image = new Image();
<span>	</span>  <span>		</span>image.src = pngPath;
<span>		</span>image.οnlοad=function(){
<span>			</span>cavans = new fabric.Canvas('cer');
<span>			</span>cavans.width=image.width;
<span>			</span>cavans.height=image.height;
<span>				</span>alert(image.width);
<span>				</span>alert(image.height);
<span>		</span>}
<span>		</span>
<span>	</span>}