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Editorial Team
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Asked: 2026-05-25T17:32:38+00:00

Could somebody tell me how to erase a rectangle that has just been drawn

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Could somebody tell me how to erase a rectangle that has just been drawn on an image?

In the application, I have an image displayed on a document (MDI application). The user can select a portion of the image. I implemented this feature as letting the user start the selection with a CRectTrackerColor (derived from CRectTracker) object. The selection works fine: a user is able select a rectangle using the mouse. A rubber band rectangle is shown as a feedback. After the user releases the left mouse, the rectangle is colored based on my pen color. Then I present a dialog for OK/Cancel. Upon Cancel, I would like the rectangle to disappear. How should I go about doing that?

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1 Answer

  1. Editorial Team

    Just invalidate that rectangle so it’ll get redrawn normally.

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