Draw on top of picturebox?

Draw on top of picturebox?

• Mark Hollman

  I'd like to now make the ellipse semi transparent, but the this doesn't seem to work:

  e.Graphics.FillEllipse(new SolidBrush(Color.FromArgb(50,255,255,255)),rect);

  any thoughts why

  Thanks,

  Pete

  
  

• JDFox

  The Paint event handler is called when a WM_PAINT message is processed by the control. You can cause a WM_PAINT message to be sent in a few different ways but the usual way is to call the Invalidate method on the control. So, for example, in the Tick event handler for the Timer you can update the location at which the ellipse should be drawn (posX, posY) and then call pictureBox1.Invalidate() to cause the control to repaint.
  
  

• Kody Clemens

  Can you give me an example I'm not exactly sure what you mean.

  Thank you sir,

  Pete M

  
  

• amanzoor

  Cool. Thank you.
  

• Phil_Ramos

  Assuming that you're using CF 2.0, the Paint event on the PictureBox has apparently been marked as not supported. This is surprising as, from memory, painting on a PictureBox was something that came up frequently in the newsgroups with CF 1.0. Anyways, you can hook the Paint event manually, even though it is not shown in the Properties window at design-time or Intellisense in the editor. You will get a warning that this is not supported; however, I just tested this on Windows Mobile 5.0 PPC and it worked as expected.

  ...

  public Form1()
  {
  InitializeComponent();
  this.pictureBox1.Paint += new PaintEventHandler(pictureBox1_Paint);
  }

  void pictureBox1_Paint(object sender, PaintEventArgs e)
  {
  using (Pen p = new Pen(Color.Black, 3))
  {
  e.Graphics.DrawEllipse(p, 0, 0, this.pictureBox1.Width, this.pictureBox1.Height);
  }
  }

  ...

  The other option is to create a new control, that inherits from the PictureBox control or some other control such as Control, override the OnPaint method, and perform any custom painting in this method.

  
  
  

• Bahman; Fakhr

  This question has been answered here...

  http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=282033&SiteID=1&mode=1

  
  
  

• Yeowser

  you also can code the class yourself inherits with control, inside the class use the OnMouseDown, OnMouseMove and OnMouseUp methods.

  
  

• shiggsy

  Assuming that you're using a PictureBox on a Form, and the Forms AutoScroll property is set to "true", then try setting the Forms AutoScrollPosition property.
  
  

• rokana3

  You can paint on a PictureBox by hooking into the Paint event of the specific PictureBox and drawing any shapes, text, etc.
  
  

• djMP2006

  My image is larger than the viewable screen on the ppc, so vertical and horizontal scrollbars automatically appear. Do you know of a scroll function in C# for these types of scrollbars Is there a way to scroll to a certain point

  Thanks in advance.

  peter

  
  

• Steven Raybell

  I am trying to update the location of the ellipse on a timer tick.

  Here's my Paint method:

  void pictureBox1_Paint (object sender, PaintEventArgs e)
  {
  using (Pen p = new Pen(Color.Gray,2))
  {
  Rectangle rect - new Rectangle(posX, posY, 10,10);
  e.Graphics.DrawEllipse(p, rect);
  e.Graphics.FillEllipse(new SolidBrush(Color.Yellow), rect);
  }

  }

  Would it be possible remove the ellipse i just drew and then, then draw it to a new location

  Oh, and what is the syntax for calling this routine from a timer_tick method

  Thanks for all of your help by the way!

  Pete M

  
  
• Draw on top of picturebox?