OpenGL in C# in visual studio.NET 2010

Question

1.00/5 (1 vote)

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Salaam
i am trying to draw something(anything at all) with OpenGL in visual studio 2010, project runs without error but nothing gets drawn, nothing happens at all.

Here is the code:

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Tao.OpenGl;
using Tao.Platform.Windows;

namespace opengl
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            SimpleOpenGlControl gl = new SimpleOpenGlControl();
            gl.InitializeContexts();
        }

     
        private void gl_Paint(object sender,PaintEventArgs e)
        {
            
            Gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
            Gl.glClear(Gl.GL_COLOR_BUFFER_BIT);
           
            Gl.glBegin(Gl.GL_POLYGON);
            Gl.glColor3f(1.0f, 0.0f, 1.0f);
            Gl.glVertex3f(0.25f, 0.25f, 0.0f);
            Gl.glVertex3f(0.75f, 0.25f, 0.0f);
            Gl.glVertex3f(0.75f, 0.75f, 0.0f);
            Gl.glVertex3f(0.25f, 0.75f, 0.25f);
            Gl.glEnd();
            Gl.glFlush();
        }
    }
}

someone please suggest what am i missing..!

Posted 10-Jul-12 0:34am

suleman115

Updated 10-Jul-12 3:17am

lukeer

v2

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Comments

[no name] 10-Jul-12 12:17pm

Are you sure that it runs without error? I am not even sure that this would compile. Gl in your gl_Paint method is undefined.

Trak4Net 10-Jul-12 13:48pm

I agree, the gl initialized in Form1_Load is within the scope of the form1_load and goes out of scope after form1_load exits. I don't know how gl_Paint would even get called unless that happens from gl.InitializeContexts, but I don't see a handler attached in the form1_load so don't know how that could even happen. As stated by Wes the variable Gl (remember C# is case sensitive) is not declared in your code sample, unless it is a static object in one of the using namespaces.

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Trak4Net · Accepted Answer · 2012-07-10T10:22:00

I think it is how you have your control declared in the constructor. If you added the SimpleOpenGlControl to the form then the constructor code you are using is pointing to a new reference not the one in the controls collection. If I use the code below I get a white background and it looks like a fuscia colored square. As I suspected Gl variable is a static class in the library...
As you see in the form2_load method I am generating a new object of SimpleOpenGlControl, initializing its context and then adding a handler to the paint event and finally adding the control to the forms control collection. I am not familiar with the OpenGL libraries so cannot give you any advice on drawing, but at least this will show you what you expected to see previously (although I am filling with white instead of black in the glClearColor method)...

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Tao.OpenGl;
using Tao.Platform.Windows;

namespace Testing
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            Tao.Platform.Windows.SimpleOpenGlControl gl = new Tao.Platform.Windows.SimpleOpenGlControl();
            gl.InitializeContexts();
            gl.Paint += new PaintEventHandler(gl_Paint);
            this.Controls.Add(gl);
        }

        void gl_Paint(object sender, PaintEventArgs e)
        {
            Gl.glClearColor(255.0f, 255.0f, 255.0f, 255.0f);
            Gl.glClear(Gl.GL_COLOR_BUFFER_BIT);

            Gl.glBegin(Gl.GL_POLYGON);
            Gl.glColor3f(1.0f, 0.0f, 1.0f);
            Gl.glVertex3f(0.25f, 0.25f, 0.0f);
            Gl.glVertex3f(0.75f, 0.25f, 0.0f);
            Gl.glVertex3f(0.75f, 0.75f, 0.0f);
            Gl.glVertex3f(0.25f, 0.75f, 0.25f);
            Gl.glEnd();
            Gl.glFlush();

        }
    }
}