Canvas controls are controls drawn on the map canvas so they can be exported to JPEG / PNG images.
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ol.control.CanvasScaleLine is an ol.control.scaleLine that is drawn on the canevas.
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ol.control.CanvasAttribution is an ol.control.attribution that is drawn on the canevas.
The setCanvas function toggles beetween standard/canvas attribution
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ol.control.CanvasTitle draw a title on the map. Use the style option to style the title.
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jqExportMap is a jQuery plugin used to export the map as an image (PNG/JPEG) or as a PDF file
(use MrRio/jsPDF lib).