SharpGL not rendering on Button Click

Question

I was testing the SharpGL sample on winform, where it is rendering triangle on openGLDraw event. But when I am trying to render it with button click its not working. Is it supposed to not render outside of openGLDraw event ? Here are the codes:

private void DrawScene()
{
    OpenGL gl = openGLControl.OpenGL;
    gl.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT);
    gl.LoadIdentity();
    gl.Begin(OpenGL.GL_TRIANGLES);
    gl.Color(1.0f, 0.0f, 0.0f);
    gl.Vertex(0.0f, 1.0f, 0.0f);
    gl.Color(0.0f, 1.0f, 0.0f);
    gl.Vertex(-1.0f, -1.0f, 1.0f);
    gl.Color(0.0f, 0.0f, 1.0f);
    gl.Vertex(1.0f, -1.0f, 1.0f);
    gl.Color(1.0f, 0.0f, 0.0f);
    gl.Vertex(0.0f, 1.0f, 0.0f);
    gl.Color(0.0f, 0.0f, 1.0f);
    gl.Vertex(1.0f, -1.0f, 1.0f);
    gl.Color(0.0f, 1.0f, 0.0f);
    gl.Vertex(1.0f, -1.0f, -1.0f);
    gl.Color(1.0f, 0.0f, 0.0f);
    gl.Vertex(0.0f, 1.0f, 0.0f);
    gl.Color(0.0f, 1.0f, 0.0f);
    gl.Vertex(1.0f, -1.0f, -1.0f);
    gl.Color(0.0f, 0.0f, 1.0f);
    gl.Vertex(-1.0f, -1.0f, -1.0f);
    gl.Color(1.0f, 0.0f, 0.0f);
    gl.Vertex(0.0f, 1.0f, 0.0f);
    gl.Color(0.0f, 0.0f, 1.0f);
    gl.Vertex(-1.0f, -1.0f, -1.0f);
    gl.Color(0.0f, 1.0f, 0.0f);
    gl.Vertex(-1.0f, -1.0f, 1.0f);
    gl.End();
}

private void openGLControl_OpenGLDraw(object sender, RenderEventArgs e)
{
    //this.DrawScene(); //Working
}

private void button1_Click(object sender, EventArgs e)
{
    this.DrawScene(); //Not working
}

Does `button1_Click` get called? If not, investigate that. – user4581301 Jul 29 '17 at 00:10 — user4581301, Jul 29 '17 at 00:10
@user4581301 Yes its calling the button1_Click – Barun Jul 29 '17 at 00:13 — Barun, Jul 29 '17 at 00:13

score 0 · Answer 1 · answered Jul 29 '17 at 00:40

Just add openGLControl.Refresh(); after DrawScene(). It was fooling me for past few days. I discovered it after reading their source code. :D

private void button1_Click(object sender, EventArgs e)
{
    this.DrawScene(); //Not working
    openGLControl.Refresh(); 
}

SharpGL not rendering on Button Click

1 Answers1