How to draw a rectangle in WinForm app in the correct location
- by TooFat
I have a WinForm app that has an image displayed in a PictureBox that has the added functionality of allowing a user to draw a rectangle on the image by clicking and dragging.
The Location, Height and Width of the rectangle are saved to disk.
When the image is viewed again I would like to automatically redraw that rectangle in the same position on the image.
When I redraw it, however, the Height and Width are fine but the location is always off.
The location is being captured in the MouseDown Event like so
private void pbSample_MouseDown(object Sender, MouseEventArgs e)
{
if (SelectMode)
{
StartLocation.X = e.X;
StartLocation.Y = e.Y;
//later on these are saved as the location of the rectangle
}
}
And I am redrawing it like so
public void DrawSelectedArea(Rectangle rect)
{
Graphics g = this.PictureBox1.CreateGraphics();
Pen p = new Pen(Brushes.Black);
g.DrawRectangle(p, rect);
}
Given the location from the MouseEventArgs captured during the MouseDown Event how can I calculate the correct location to redraw my rectangle?
