get-view-start

Get the location at which the visible portion of the canvas starts, based on the current values of the horizontal and vertical scrollbars if they are initialized as automatic (see init-auto-scrollbars ). Combined with get-client-size, an application can efficiently redraw only the visible portion of the canvas. The values are in pixels.

If the scrollbars are disabled or initialized as manual (see init-manual-scrollbars), the result is 0.

• (send a-canvas get-view-start) -> two exact integers in [0, 10000]