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POHow to get the TopLeft screen-coordinate of a PictureBox on a Windows Forms
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  1. POHow to get the TopLeft screen-coordinate of a PictureBox on a Windows Forms
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    copied!<p>I have a a <code>PictureBox</code> on my Windows Forms.</p> <p>I am drawing a <code>Rectangle</code> on the <code>PictureBox</code>, with <code>ControlPaint.DrawReversibleFrame()</code>, and want to code some boundaries, so I am only drawing on the <code>PictureBox</code> and not the whole screen.</p> <p>How do I find the screen-coordinates of the topleft point of the <code>PictureBox</code>?</p> <p><strong>EDIT with solution</strong>: Here's my solution, if anybody need to code some PictureBox boundaries.</p> <pre><code> if (_isDragging) // If the mouse is being dragged, undraw and redraw the rectangle as the mouse moves. { pictureBoxMap.Refresh(); ControlPaint.DrawReversibleFrame(_theRectangleScreenCoords, BackColor, FrameStyle.Dashed); // Hide the previous rectangle by calling the DrawReversibleFrame method with the same parameters. Point endPoint = ((Control)sender).PointToScreen(new Point(e.X, e.Y)); var topLeftPictureBoxMap = pictureBoxMap.PointToScreen(new Point(0, 0)); int width = endPoint.X - _startPointTheRectangleScreenCoords.X; int height = endPoint.Y - _startPointTheRectangleScreenCoords.Y; // limit rectangle in x-axis var diff_x = pictureBoxMap.Width - (_startPointTheRectangleScreenCoords.X - topLeftPictureBoxMap.X); var diff_x_2 = (pictureBoxMap.Width - (_startPointTheRectangleScreenCoords.X - topLeftPictureBoxMap.X)) - pictureBoxMap.Width; if (width &gt; diff_x) { width = diff_x; } else if(width &lt; diff_x_2) { width = diff_x_2; } // limit rectangle i y-aksen var diff_Y = pictureBoxMap.Height - (_startPointTheRectangleScreenCoords.Y - topLeftPictureBoxMap.Y); var diff_Y_2 = (pictureBoxMap.Height - (_startPointTheRectangleScreenCoords.Y - topLeftPictureBoxMap.Y)) - pictureBoxMap.Height; if (height &gt; diff_Y) { height = diff_Y; } else if(height &lt; diff_Y_2) { height = diff_Y_2; } _theRectangleScreenCoords = new Rectangle( _startPointTheRectangleScreenCoords.X, _startPointTheRectangleScreenCoords.Y, width, height); ControlPaint.DrawReversibleFrame(_theRectangleScreenCoords, Color.Red, FrameStyle.Dashed); // Draw the new rectangle by calling DrawReversibleFrame again. } </code></pre>
 

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