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    <p>eventually I created an enclosing Rect of A and B, and then applied the solution in <a href="https://stackoverflow.com/questions/7595651/get-vector-between-2-rectangles">this question</a>, like this:</p> <pre><code> private static Point CorrectForAllowedArea(Point previousLocation, Point newLocation, Rect allowedArea, Rect newBox) { // get area that encloses both rectangles Rect enclosingRect = Rect.Union(allowedArea, newBox); // get corners of outer rectangle, index matters for getting opposite corner var outsideCorners = new[] { enclosingRect.TopLeft, enclosingRect.TopRight, enclosingRect.BottomRight, enclosingRect.BottomLeft }.ToList(); // get corners of inner rectangle var insideCorners = new[] { allowedArea.TopLeft, allowedArea.TopRight, allowedArea.BottomRight, allowedArea.BottomLeft }.ToList(); // get the first found corner that both rectangles share Point sharedCorner = outsideCorners.First((corner) =&gt; insideCorners.Contains(corner)); // find the index of the opposite corner int oppositeCornerIndex = (outsideCorners.IndexOf(sharedCorner) + 2) % 4; // calculate the displacement of the inside and outside opposite corner, this is the displacement outside the allowed area Vector rectDisplacement = outsideCorners[oppositeCornerIndex] - insideCorners[oppositeCornerIndex]; // subtract that displacement from the total displacement that moved the shape outside the allowed area to get the displacement inside the allowed area Vector allowedDisplacement = (newLocation - previousLocation) - rectDisplacement; // use that displacement on the display location of the shape return previousLocation + allowedDisplacement; // move or resize the shape inside the allowed area, right upto the border, using the new returned location } </code></pre>
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