C# none noticeable graphic refresh

Question

0.00/5 (No votes)

See more:

This is my code

this is in the picturebox1_move

panel1.Refresh();

and in the picurebox1_paint i got

//here
           Graphics c = panel1.CreateGraphics();
           Pen red = new Pen(Color.Red, 5);
           g.DrawLine(red, new Point(picturebox1.Location.X, picturebox1.Location.Y), new Point(picturebox1.Location.X, panel1.Height));

my problem is when the panel the graphic is in it keeps flashing when it is refreshed and it looks very un-professional, I was wondering if I can get this refresh thing with-out these annoying flashing

Posted 19-Jun-12 21:57pm

C.CoderCreator

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2012-06-19T22:21:00

You could try setting the Form.DoubleBuffered property to true.
Otherwise, why are you refreshing a panel when you move a picturebox, and why the heck are you painting in the panel when you paint the picturebox? (Assuming you meant Graphics g = panel... in your code above not Graphics c = panel...)

Stephen Hewison · Answer 2 · 2012-06-19T22:20:00

Solution 1

If you're overriding paint you shouldn't be creating your own graphics object.

Are you trying to draw the panel or the picture box? You shouldn't confuse the refresh of one control with the other. Try this:

C#

picturebox1.Paint += new PaintEventHandler(picturebox1_Paint);

The event arguments for the event delegate contains the graphics object for drawing the control:

C#

void picturebox1_Paint(object sender, PaintEventArgs e)
{
  Graphics c = e.Graphics;
  //the rest of your code
}

If the picture box is nested in the panel, calling the refresh on the panel will still call your picture box paint method.

Posted 19-Jun-12 22:20pm

Stephen Hewison

Comments

[no name] 20-Jun-12 7:11am

//ths will put a line on the panel1
private void panel1_Paint(object sender, PaintEventArgs e)
{

panel1.Refresh();
//here
Graphics c = panel1.CreateGraphics();
Pen red = new Pen(Color.Red, 2);
c.DrawLine(red, new Point(BeatDetector.Location.X + 5, BeatDetector.Location.Y), new Point(BeatDetector.Location.X + 5, panel1.Height));

Graphics g = panel1.CreateGraphics();
Pen black = new Pen(Color.Black, 5);
g.DrawLine(black, new Point(panel1.Width, 16), new Point(0, 16));

float[] dashValues = { 2, 5, 2, 5 };
Pen blackPen = new Pen(Color.Black, 2);
blackPen.DashPattern = dashValues;
e.Graphics.DrawLine(blackPen, new Point(panel1.Width, panel1.Height), new Point(0, panel1.Height));
}

It still flashes

Stephen Hewison 20-Jun-12 8:30am

That's because you didn't do any of things I told you to do:

//ths will put a line on the panel1
private void panel1_Paint(object sender, PaintEventArgs e)
{

//here
Graphics c = e.Graphics;
Pen red = new Pen(Color.Red, 2);
c.DrawLine(red, new Point(BeatDetector.Location.X + 5, BeatDetector.Location.Y), new Point(BeatDetector.Location.X + 5, panel1.Height));

Pen black = new Pen(Color.Black, 5);
c.DrawLine(black, new Point(panel1.Width, 16), new Point(0, 16));

float[] dashValues = { 2, 5, 2, 5 };
Pen blackPen = new Pen(Color.Black, 2);
blackPen.DashPattern = dashValues;
c.DrawLine(blackPen, new Point(panel1.Width, panel1.Height), new Point(0, panel1.Height));
}

Stephen Hewison 20-Jun-12 8:33am

You were using 3 different graphics objects to draw to the same component and you were calling refresh within the paint method!

[no name] 21-Jun-12 6:07am

kk, i try that but, for some reason it keeps repainting its self, but thats not ment to happen, its meant to move when drag it and clear the last part of where i has just moved it