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c#3dopentk

How to implement a vertical scroll bar for openTK gameWindow

I am developing a 2d windows application using openTK and c#. i am using gamewindow class.

class myWindow : GameWindow
{
}

is there any way to implement a vertical scroll bar for this window?? Thank You

Solution

  • Make your-very-own Scrollbar widget. Draw it in 2D using OpenGL:

    DrawVerticalScrollBar(scrollbar_x, scrollbar_y, 
   scrollbar_width, scrollbar_height, 
   vertical_scroll, min_value, max_value); //pseudocode

    Then later draw the contents of the "scroll-bar" view:

    GL.Enable(EnableCap.ScissorTest);
GL.Scissor(view_start_x, view_start_y, view_end_x, view_end_y);

// Assume matrix mode is modelview
GL.PushMatrix();
GL.Translate(0, -vertical_scroll, 0);
      // Draw the graphics affected by scrollbar
GL.PopMatrix();

GL.Disable(EnableCap.ScissorTest);

// Draw rest of the 2d graphics

    If you don't want to clip contents of the view, you can remove the ScissorTest and GL.Scissor