VC# - Drawing an Image to a Control

[123shailesh]

I have a picturebox (imgViewer) which is displaying an image. Now i want to display another image (a smaller one) on top of this image. This is what i was doing:

private void btn_Path_Click(object sender, EventArgs e)
{
Bitmap path = new Bitmap(@"C:\Engg\Path.JPG");
Graphics graph = this.imgViewer.CreateGraphics();

graph.DrawImage(path, 0, 0);

graph.Dispose();
}


But nothing happens when i push my button (btn_Path). But when i change the code to draw on my form (instead of my picturebox), it works:

Graphics graph = this.CreateGraphics();

it properly paints on the form. What is wrong????? How can I paint on my picturebox which is already displaying an image?

[khanbtech]

you need to redraw the same image again, see the sample code below

Bitmap newbmp = new Bitmap(bmpCropped, 160, 125);
Graphics g = Graphics.FromImage(newbmp);
ImageAttributes attributes = new ImageAttributes();
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.DrawImage(newbmp, new Rectangle(photo_x, photo_y, photo_wdh, photo_hgt), photo_x, photo_y,newbmp.Width, newbmp.Height, GraphicsUnit.Pixel, attributes);

[Plater]

It's possible that the button's paint() function is being called and it's redrawing itself. (which does not include your picture)

You would probably have to override the controls paint function OR attach your own listener to its paint event.
Then you could draw your image in there after it draws itself.

[123shailesh]

hey i managed to find a simple solution:

private void btn_Path_Click(object sender, EventArgs e)
{
Bitmap path = new Bitmap(@"C:\Engg\Path.JPG");
Graphics graph = Graphics.FromImage( this.imgViewer.Image );
graph.DrawImage(path, 0, 0);

graph.Dispose();
}

thanks everyone!