Drawing a rectangle with a mouse.........

[A2K]

Hi,

I have made an applicationa in C#(VS 2005), which allows the user to plot and zoom a graph.

while zooming, the user drags the mouse to specify a rectangular area, which is then magnified.

I would like to show this rectangle actually being created.

The problem is, the apllication creates a rectangle with every drag of the mouse,
thereby creating nearly 100-200 rectangles. I want only the last rectangle to be visible and erase the previos rectangles.

Any help is appreciated.
Thnx.

[RedSon]

This is an advanced topic and we will need to see your rectangle drawing code. I suspect you will be detecting a mouse LBUTTONDOWN event and then starting to draw your rectangle from the X,Y coords of that point. But I would need to see that block of your code to tell you what is going on.

[A2K]

Hi,
I got the solution for it from the net.

The DrawReversibleFrame method automatically erases the previous rectangles.

ControlPaint.DrawReversibleFrame(thisform.Rectangl eToScreen(SelectRect), Color.Black, FrameStyle.Dashed);

If it could help you, I can send you the complete code.

bye.

[RedSon]

No need I was just curious.

[mallyajiggs]

On Similar Grounds... i am drawing a rectangle ..with mouse dynamically using mouse events ..

I want it to display the rectangle as i draw it .. something like in paint/ photoshop !! how do i do it ..>!!


thnx ;)

[dotnetmaster]

On Similar Grounds... i am drawing a rectangle ..with mouse dynamically using mouse events ..

I want it to display the rectangle as i draw it .. something like in paint/ photoshop !! how do i do it ..>!!


thnx ;)

Hi friend, i m working on the GIS using .Net platform.
I like to do zoom on image by using rectangle zoom.

so please if u have code for the same, please reply me.

thanx

[Plater]

Hi friend, i m working on the GIS using .Net platform.
I like to do zoom on image by using rectangle zoom.

so please if u have code for the same, please reply me.

thanx

Using the above posts as references, you should be able to figure out how to draw the "rectangles".
Once you have the rectangle, you can use Bitmap's CreateThumbnail() function to create a thumbnail with the coordinates of the rectangle.
You would then set that thumbnail image back to the picture displaying control and setting it's mode to stretch.