asked on

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

AlexFM

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;
}

annihil8

ASKER

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?

ASKER CERTIFIED SOLUTION

AlexFM

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annihil8

ASKER

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