Graphics functionality question

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How do I make this work. I have two methods,

C#

public void Calculate(Graphics g)
 {
 ---code---
 }   

private void btnPrint_Click(object sender, EventArgs e)
 {
  ---code---
  Calculate(Graphics g);
 }

I want to call the Calculate method inside the btnPrint_Click method but I cannot do it. Any help is appreciated.

Posted 1-Aug-12 12:05pm

Al Yambo

Updated 1-Aug-12 12:06pm

Kenneth Haugland

v2

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TRK3 1-Aug-12 18:11pm

What do you mean "I cannot do it"?

Do you mean the compiler complains because you should be calling:

Calculate(g) instead of Calculate(Graphics g) ?

Or do you mean you get an exception when you call it?

Or ?

Kenneth Haugland 1-Aug-12 18:13pm

How could I not see that... Post it as the answer....

Al Yambo 1-Aug-12 18:38pm

I get an exception when I use either Calculate(g); , Calculate(Graphics g);
inside of private void btnPrint_Click(object sender, EventArgs e) method. "The name g does not exist in the current context" & "System.Drawing.Graphics is a type but is used like a variable".

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-08-01T12:57:00

Easy. You would easily find a solution if you thought just a bit more.

C#

public partial class FormMain {
    
    void Print() {
        using (PrintDocument pd = new PrintDocument()) {
                if (PrinterSettings != null) 
                    PrintDialog.PrinterSettings = PrinterSettings;
                pd.PrintPage += (sender, eventArgs) => { this.Calculate(eventArgs.Graphics); };
                DialogResult result = PrintDialog.ShowDialog();
                if (result != DialogResult.OK) return;
                PrinterSettings = PrintDialog.PrinterSettings;
                PrintDialog.Document = pd;
                pd.PrinterSettings = PrinterSettings;
                // could be a lot more, like taking into account page setup, using page setup dialog...
                pd.Print();
            } //using (pd.Dispose is automatically called in this point)
    } //Print

    PrintDialog PrintDialog = new PrintDialog();
    PrinterSettings PrinterSettings;

    //...

} //class FormMain

Your Calculate(Graphics g) is actually a good idea, but you probably underestimate it. You abstract some rendering from concrete instance of System.Drawing.Graphics. This way, you can have only one graphics rendering method and call it from some controls OnPaint but also use it for other targets of rendering: "Print", "Print to…", "Export to bitmap", "Export to…" (some vector graphics) and the like — quite universal. Are you getting the idea?

—SA

Kenneth Haugland · Answer 2 · 2012-08-01T12:19:00

Solution 1

Totally rip off but I think TRK3 is right:

Quote:
What do you mean "I cannot do it"? Do you mean the compiler complains because you should be calling: Calculate(g) instead of Calculate(Graphics g) ? Or do you mean you get an exception when you call it? Or ?

Posted 1-Aug-12 12:19pm

Kenneth Haugland

Comments

Al Yambo 1-Aug-12 18:54pm

I get an exception when I use either Calculate(g); , Calculate(Graphics g);
inside of private void btnPrint_Click(object sender, EventArgs e) method. "The name g does not exist in the current context" & "System.Drawing.Graphics is a type but is used like a variable".

Sergey Alexandrovich Kryukov 1-Aug-12 19:00pm

Of course... but... either think a bit more or see my solution. It's easy enough.
(Double post due to some flaw on the server side... :-)
--SA

Sergey Alexandrovich Kryukov 1-Aug-12 19:01pm

Of course but... what are you doing? Just think a bit more... or see my solution.
--SA

Sergey Alexandrovich Kryukov 1-Aug-12 18:59pm

"I cannot do" is not informative, but in this particular case, it looks clear to me. Please see my answer.
Actually, OP's Calculate(Graphics g) can be considered as a right idea, needs a bit more of elaboration...
--SA

Kenneth Haugland 1-Aug-12 19:34pm

Just copyed the whole response unedited, so everybody would know where i got i from.

Sergey Alexandrovich Kryukov 1-Aug-12 21:09pm

Sure.
--SA