Read canvas image by HTTP: Difference between revisions

Read canvas image by HTTP (view source)

88 bytes added , 23 January 2019

183

edits

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 Start fgfs with option "--httpd=5701" (the port number is free, but 5701 is used by the showcase HTML script). Enter the URL
 <syntaxhighlight>
-localhost:5701/canvasimage?type=png&canvasindex=0
+http://localhost:5701/screenshot?canvasindex=4&type=png
 </syntaxhighlight>
-in your browser. The first request will add the property rendertoimage to the canvas with index 0 but return no image (this is no intended behaviour but the result of insufficient synchronization between the rendering thread and the HTTP thread). The request needs to be send again and the image of canvas 0 is returned. Its up to the user to specify a valid canvas index. An invalid canvas index or any form of invalid URL will not result in an error message but simply return no result (until it runs into some browser timeout).
+in your browser. The first request will add the property rendertoimage to the canvas with index 4 but return no image (this is no intended behaviour but the result of insufficient synchronization between the rendering thread and the HTTP thread). The request needs to be send again and the image of canvas 4 is returned. Its up to the user to specify a valid canvas index. An invalid canvas index or any form of invalid URL will not result in an error message but simply return no result (until it runs into some browser timeout). For the 777-200 canvas index 4 is the ND, 5 the MFD. PFD seems not to use Canvas.
 === Sample Showcase CanvasView.html ===