c sharp drawing (graphic)

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When i create drawing on panel .. if i minimize and maximize the form, drawing will be erased

how can i prevent clear drawing

i test flush(), and dispose()

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C#

private void button1_Click(object sender, EventArgs e)
{
     priceValue();
     Diagrams f2 = new Diagrams();
     f2.Show();
     Graphics g1 = f2.panel1.CreateGraphics();
     g1.Clear(f2.panel1.BackColor);
     Pen pen1 = new Pen(Color.Black,1);
     g1.DrawLine(pen1, 100, 400, 600, 400);
     g1.DrawLine(pen1, 100, 50, 100, 400);
     Font myFont = new System.Drawing.Font("Ubuntu_Titling_Rg", 10, FontStyle.Bold);
     Brush myBrush = new SolidBrush(System.Drawing.Color.Gold);
     int i=0;
     do
     {
         g1.DrawLine(pen1, 95, 50 + i, 100, 50 + i);
         i += 70;
     }
     while (i <= 350);
     System.Drawing.StringFormat drawFormat = new System.Drawing.StringFormat(StringFormatFlags.DirectionVertical);
     g1.DrawString(comboBox1.Text + " items cost schedule", myFont, myBrush, 15, 120, drawFormat);
     g1.DrawString("0", myFont, myBrush, 70, 390);
     g1.DrawString(lastPrice.ToString(), myFont, myBrush, 65, 320);
     g1.DrawString(midP3rice.ToString(), myFont, myBrush, 60, 250);
     g1.DrawString(midPrice.ToString(), myFont, myBrush, 57, 180);
     g1.DrawString(mid2Price.ToString(), myFont, myBrush, 50, 110);
     g1.DrawString(firstPrice.ToString(), myFont, myBrush, 50, 40);
     Pen pen2 = new Pen(Color.FromArgb(30,60,153), 5);
     Rectangle myRectangle = new Rectangle(5, 5, 658, 540);
     g1.DrawRectangle(pen2, myRectangle);
     RectangleF rect = new RectangleF(140, 110, 20, 290);
     g1.DrawString("Main Items", myFont, myBrush, 300, 500);
     int pos = 160;
     for (int j = 0; j < treeView1.Nodes.Count; j++)
     {
         if(treeView1.Parent.HasChildren == true)
             g1.DrawString(treeView1.Nodes[j].Text, myFont, myBrush, pos, 400, drawFormat);
         pos += 460/4;
     }
     g1.Save();
     g1.Dispose();
}

Posted 2-May-11 2:27am

Sendian

Updated 2-May-11 5:20am

thatraja

v4

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Comments

Olivier Levrey 2-May-11 9:28am

I moved your code from comments to question to make it more readable.

Sendian 2-May-11 9:31am

Thank you

2 solutions

Solution 2

Addition to the answer by Olivier:

If lambda cannot be used (because of v.2.0), use anonymous without lambda. It will have almost all the benefits of lambda, only parameters type should be explicitly specified:

C#

panel1.Paint += delegate(object sender, System.EventArgs eventArgs)
{
    //... same thing...
};

—SA

Posted 2-May-11 3:51am

Sergey Alexandrovich Kryukov

Comments

Olivier Levrey 2-May-11 9:59am

I see. I started using lambda and anonymous methods at the same time with 3.5 and didn't know much about their "history". Have a 5.

Sergey Alexandrovich Kryukov 2-May-11 10:16am

Thank you, Olivier. I understand. Well, some history from 2.0 is good to know, as 2.0 still makes sense. I provided build for all my articles starting with v.2.0 and up, some small pieces required "#if...".
--SA

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Olivier Levrey · Accepted Answer · 2011-05-02T02:35:00

Solution 1

Handle the Paint event for your panel, and put all your drawing code inside that handler.

public Form1()
{
     InitializeComponent();

     //handle the Paint event for the panel
     panel1.Paint += (sender, e) =>
     {
          //put you drawing code here
          //and use e.Graphics instead of CreateGraphics
     };
}

Or without lambda expressions:

public Form1()
{
     InitializeComponent();
     //handle the Paint event for the panel
     panel1.Paint += panel1_Paint;
}

//the painting function for panel1
private void panel1_Paint(object sender, PaintEventArgs e)
{
    //put you drawing code here
    //and use e.Graphics instead of CreateGraphics
    e.Graphics.DrawString(...);
    e.Graphics.DrawRectangle(...);
}

Posted 2-May-11 2:35am

Olivier Levrey

Updated 2-May-11 3:45am

v4

Comments

RaviRanjanKr 2-May-11 8:41am

Nice Answer! My 5 :)

Olivier Levrey 2-May-11 8:46am

Thank you RaviRanjankr.

Sendian 2-May-11 9:23am

but how can i do with 2 forms

Olivier Levrey 2-May-11 9:32am

It doesn't change much. I updated my answer.

Sendian 2-May-11 9:42am

please give me sometime .. what is this mean .. for me is this wrong code i'm begginer

Olivier Levrey 2-May-11 9:45am

Sorry I used lambda expressions... I gave the same code without them.

Sergey Alexandrovich Kryukov 2-May-11 9:46am

Aha! My 5.
--SA

Olivier Levrey 2-May-11 9:47am

Yeah, you got me!! First time I'm using lamba in an answer, and OP doesn't understand :(...

Sergey Alexandrovich Kryukov 2-May-11 14:23pm

I don't this this is lambda, because this is just a cook-book case, not a very deep background. I can't see, where is misunderstanding? "for me is this wrong code i'm begginer" -- just the attitude. Not understanding is just fine, but "wrong"... -- some people are like that.
--SA

Sergey Alexandrovich Kryukov 2-May-11 9:53am

Oh, once you decided to show anonymous forms and lambda, you miss one which is essential, because the only version which cannot accept lambda is v.2.0 (let's not consider anything before -- would not make much sense), but anonymous is still used.

So, please see my -- supplementaty -- solutions.
--SA

Kim Togo 2-May-11 16:50pm

My 5. Good answer.