how to draw a rectangle by mouse through code from any co-ordinates

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My program draws rectangle through code only when i drag from upper-left corner.
I want it to be from any side i drag the mouse.

I'm using

C#

CreateGraphic.DrawRectangle(pen,rectangle);

Posted 27-Dec-11 20:42pm

Ashakoti

Updated 27-Dec-11 20:44pm

Mehdi Gholam

v2

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2 solutions

Solution 2

I solved it myself in a similar way.. But now while drawing it flickers a lot..

i override the method OnPaintBackgound() and left it empty. This avoids flickering completely but form background and other controls are disabled.. It becomes transparent.

Can anyone suggest a solution ...

Posted 28-Dec-11 19:24pm

Ashakoti

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OriginalGriff · Accepted Answer · 2011-12-27T21:21:00

You need to handle four events, either for the Form you want to draw on, or a Panel instead:

MouseDown
MouseMove
MouseUp
Paint

Declare three class level variables:

C#

private bool drawBox = false;
private Point start;
private Point end;

Handle the Paint event:

C#

private void myPanel_Paint(object sender, PaintEventArgs e)
    {
    if (start != null && end != null)
        {
        int mnX = Math.Min(start.X, end.X);
        int mnY = Math.Min(start.Y, end.Y);
        int mxX = Math.Max(start.X, end.X);
        int mxY = Math.Max(start.Y, end.Y);
        e.Graphics.DrawRectangle(Pens.Black, mnX, mnY, mxX - mnX, mxY - mnY);
        }
    }

And handle the mouse events:

C#

private void myPanel_MouseDown(object sender, MouseEventArgs e)
    {
    drawBox = true;
    start = e.Location;
    end = start;
    myPanel.Invalidate();
    }

private void myPanel_MouseMove(object sender, MouseEventArgs e)
    {
    if (drawBox)
        {
        end = e.Location;
        myPanel.Invalidate();
        }
    }

private void myPanel_MouseUp(object sender, MouseEventArgs e)
    {
    drawBox = false;
    }