how do I draw lines in windows form using c#

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I need it in a windows form application to plot graph of inequalities given any equation. Thanks. I just need the idea and logic to do it.

Posted 27-Aug-14 2:36am

matmape

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ZurdoDev 27-Aug-14 8:38am

I believe there is a chart control for winforms.

matmape 27-Aug-14 8:42am

okay, can I use it to draw lines?
Maybe I should read more on the Graphics Class with the DrawLines() method

Sid_Joshi 27-Aug-14 8:54am

If U wants to draw Charts use System.Windows.Forms.DataVisualization.Charting Reference.

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-08-27T05:58:00

Please don't try to use Solution 1; in almost all cases, it won't work; anyway, it does not give you a right idea on how to make it working.

Please see my past answers:
What kind of playful method is Paint? (DataGridViewImageCell.Paint(...))[^],
capture the drawing on a panel[^],
How to speed up my vb.net application?[^],
Zoom image in C# .net mouse wheel[^],
Drawing Lines between mdi child forms[^].

Besides, you can use Microsoft Charts:
http://msdn.microsoft.com/en-us/library/system.windows.forms.datavisualization.charting.chart%28v=vs.110%29.aspx[^] (for .NET v.4.0-4.5).

For .NET 3.5, you can download Microsoft Chart Controls for Microsoft .NET Framework 3.5:
http://www.microsoft.com/en-us/download/details.aspx?id=14422[^].

—SA

Sid_Joshi · Answer 2 · 2014-08-27T02:52:00

Solution 1

Graphics gdi = this.CreateGraphics();
            gdi.DrawLine(Pens.Red, new Point(0, 0), new Point(100, 100));

Posted 27-Aug-14 2:52am

Sid_Joshi

Updated 27-Aug-14 2:53am

v2

Comments

matmape 27-Aug-14 8:53am

Thanks for that, would implement this too

Sid_Joshi 27-Aug-14 8:55am

If U wants to draw Charts use System.Windows.Forms.DataVisualization.Charting Reference.

matmape 27-Aug-14 11:58am

I didnt mean chart, what I want to use it for is to create textbox to enter the inequality equation and then generate a graph representing the solved inequality. Ive learnt how to draw line but, the logic behind solving the problem is somehow difficult for me

Sergey Alexandrovich Kryukov 27-Aug-14 11:52am

Very bad answer. It depends on the context, but normally such lines will disappear at any invalidation. The instance of Graphics should be the one passed to OnPaint of the handler of Paint.
—SA

matmape 27-Aug-14 11:57am

but, I think i can fire it up using a button and not necessarily the Form's paint handler

Sergey Alexandrovich Kryukov 27-Aug-14 12:02pm

Right, but the graphic won't persist on the form. So why doing that? I explained everything in my answer.
—SA