• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 263
  • Last Modified:

Use e.graphics after paintevent

Hi,

I'm developping a program which shows gpscoordinates on a panel.
This code works fine, it shows a circle on the panel on the wright coodinates:

private void pnl_drawing_Paint(object sender, PaintEventArgs e)

{

Device _dev = new Device();

_dev.D_Id = 1;

Coordinate[] _coordinates = _dev.getCoordinates();

e.Graphics.FillEllipse(new SolidBrush(ColorArray[0]), _coordinates[0].C_X, _coordinates[0].C_Y, 10, 10);

}

When I use this code, it doesn't show the circle anymore:

private void Frm_main_Load(object sender, EventArgs e)

{

   InitializeDatabase();

   InitializeDevices();


}

private void InitializeDevices()

{

   Device _dev = new Device();

   _dev.D_Id = 1;

   Coordinate[] _coordinates = _dev.getCoordinates();

   Graphics e = pnl_drawing.CreateGraphics();

   e.FillEllipse(new SolidBrush(ColorArray[0]), _coordinates[0].C_X, _coordinates[0].C_Y, 10, 10);

}

I need the second way of coding to work because I need to repaint the dots manually. So eventually I can "Play" the route in a Timerevent.

Does anybody has an idea to solve my problem?

Grtz

Annihil8

0
annihil8
Asked:
annihil8
  • 2
  • 2
1 Solution
 
AlexFMCommented:
Device _dev;        // class member

private void pnl_drawing_Paint(object sender, PaintEventArgs e)
{
  if ( _dev != null )
  {
      Coordinate[] _coordinates = _dev.getCoordinates();
      e.Graphics.FillEllipse(new SolidBrush(ColorArray[0]), _coordinates[0].C_X, _coordinates[0].C_Y, 10, 10);
  }
}

private void Frm_main_Load(object sender, EventArgs e)
{
   InitializeDatabase();
   InitializeDevices();
}

private void InitializeDevices()
{
   _dev = new Device();
   _dev.D_Id = 1;
}
0
 
annihil8Author Commented:
Allright, and what do I need to do to "play" the coordinates?
I mean the [0] is now hardcoded but i has to be an value of the timer(1000ms/tick) Can I call the pnl_drawing_paint(..) in this timer_click event?
0
 
AlexFMCommented:
In the timer event change some class member and invalidate form. Invalidate is indirect call to paint event handler:

Device _dev;        // class member
int index;

private void pnl_drawing_Paint(object sender, PaintEventArgs e)
{
  if ( _dev != null )
  {
      Coordinate[] _coordinates = _dev.getCoordinates();
      e.Graphics.FillEllipse(new SolidBrush(ColorArray[index]), _coordinates[index].C_X, _coordinates[index].C_Y, 10, 10);
  }
}

private void Frm_main_Load(object sender, EventArgs e)
{
   InitializeDatabase();
   InitializeDevices();
}

private void InitializeDevices()
{
   _dev = new Device();
   _dev.D_Id = 1;
}

private void timer1_Tick(object sender, EventArgs e)
{
    index++;
    Invalidate();
}
0
 
annihil8Author Commented:
Nice :) It worked. Tnx!

2 remarks:
- ColorArray[index]) should stay ColorArray[0] ==> Every device has it own trackingcolor and not every second.
- Invalidate() should be Invalidate(true); or  pnl_drawing.Invalidate(); ==> Invalidate() only redraws the parentcontainer("this") and not the pnl containing the coordintates.

Grtz
Annihil8

0

Featured Post

Take Control of Web Hosting For Your Clients

As a web developer or IT admin, successfully managing multiple client accounts can be challenging. In this webinar we will look at the tools provided by Media Temple and Plesk to make managing your clients’ hosting easier.

  • 2
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now