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Editorial Team
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Asked: 2026-06-13T19:27:50+00:00

In android canvas, I’ve defined a clipping area with many shapes (a rectangle and

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In android canvas, I’ve defined a clipping area with many shapes (a rectangle and 2 circles). I want to get the inscribed rectangle defined by the clipping area.

Canvas has a method called getClipBounds() which gives me the circumscribed rectangle, how do I get the inscribed rectangle instead?

enter image description here

Edit: Here’s some info on how the original shape is made:

  1. First add a clip for the big circle with Region.Op.INTERSECT
  2. Then add a clip for a vertical rectangle with Region.Op.INTERSECT
  3. Then add a clip for a smaller circle with Region.Op.DIFFERENCE
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1 Answer

  1. Editorial Team

    This can be determined mathematically if you know the radius & center of both circles.

    Find two the intersection points of circles with the getClipBounds() rectangle.
    -The the second highest intersection point between the red circle and the getClipBounds() rectangle holds the upper y coordinate of the rectangle.
    -The high intersection point between the white circle and the getClipBounds() rectangle holds the lower y coordinate of the rectangle.
    -The x bounds are already given by the getClipBounds() rectangle.

    You can construct your three shapes from there.

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