Represent the chart image to be viewed.
WebImage is a ChartDirector internal data type to represent a chart image. A WebImage object can be created using BaseChart.makeWebImage
, and then assigned to the Image property of the RazorViewPortControl for display.
The RazorViewPortControl will first output an <IMG> tag to the browser. When the browser loads the image according to the URL in the <IMG> tag, the RazorViewPortControl will respond by sending the chart image to the browser.
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