在pictureBox上放置形状，C＃

Question

I have a pictureBox, I need to put some ovalshapes on different places over the pictureBox..

In some reason the shapes are behind the picture and they unseen..

Can I do something that the shapes will be over the picture and not behind it..?

What property change this?

Answer 1

To paint some oval shapes you use a List<Rectangle> ovals = List<Rectangle>();

To draw them you have a choice of

• drawing them into the Image of the PictureBox or--
• on top of the PictureBox.

For the former you need to create the Graphics object from the Image you want to change:

Bitmap bmp = new Bitmap(pictureBox1.Image);
using (Graphics graphics = Graphics.FromImage(bmp))
   foreach (Rectangle R in ovals)
        graphics.FillEllipse(yourBrush, R.X, R.Y, R.Width, R.Height);
if (pictureBox1.Image != null) pictureBox1.Image.Dispose();
pictureBox1.Image = bmp;

This code will change the pixels and can be put anywhere.

For the latter you use the Paint event:

foreach (Rectangle R in ovals)
   e.Graphics.FillEllipse(yourBrush, R.X, R.Y, R.Width, R.Height);

This version will only change the surface of the PicureBox and needs to be put in or be triggered from the Paint event.

I think you want this version..