My Immediate Mode GUI (IMGUI) class for Jarrod's HGE

**paul_nicholls** · 29-09-2010, 06:30 AM

Hi all,
I have been working on a GUI system that I can use in The Probe (or other Hadron Game Engine programs)...

Here is a screenshot of the currently working GUI that I am using to control the audio options in The Probe

I have been chopping out GUI elements (elements inside the window) from a controls VGScene demo I downloaded here:

http://ksdev.com/vgscene/download.html

I got the elements for the window itself (after some editing) from this project:

http://www.sulaco.co.za/opengl_project_glWindows.htm

I used my image packer program to jam all the elements together and am reading them into my GUI class.

I have based my GUI class from a Immediate Mode GUI tutorial here (and converting it to Pascal obviously):

http://sol.gfxile.net/imgui/index.html

When it is finished, I will probably share the GUI code (hey, perhaps it will be included in Jarrod's HGE itself)

Here is how the code currently looks to create the GUI you see in the above screenshot:

Code:

procedure TTheProbe.RenderAudioOptions;
var
  x,y: Integer;
  GuiFont: Integer;
  ValueF: Single;
begin
  GuiFont := FGUIFont;

  FGUI.Prepare;
    FGUI.SetFontColor(255,255,255,255);
    FGUI.SetBackgroundColor(64,64,64,255);
    FGUI.StartWindow(100,100,270,218,'Audio Options',App_SysFont);
      x := 8;
      y := 16;

      // music options
      if FGUI.DoCheckBox(FMusicEnabled,x,y,'music enabled',GuiFont) then
      begin
        if not FMusicEnabled then
        begin
          FMusicVolume := 0;
          Audio_SetMusicVol(FMusicVolume)
        end;
      end;

      y := 44;
      FGUI.DoLabel(x,y,'music volume',GuiFont,White);

      y := 72;
      ValueF := FMusicVolume;
      if FGUI.DoHorizontalTrackBar(x,
                                   y,
                                   255,
                                   0,1,
                                   ValueF) then
      begin
        if (ValueF > 0) and not FMusicEnabled then
          FMusicEnabled := True;
          
        FMusicVolume := ValueF;
        Audio_SetMusicVol(FMusicVolume);
      end;

      y := 124;
      // sfx options
      if FGUI.DoCheckBox(FSfxEnabled,x,y,'sfx enabled',GuiFont) then
      begin
        if not FSfxEnabled then
          FSfxVolume := 0;
      end;

      y := 152;
      FGUI.DoLabel(x,y,'sfx volume',GuiFont,White);

      y := 180;
      ValueF := FSfxVolume;
      if FGUI.DoHorizontalTrackBar(x,
                                   y,
                                   255,
                                   0,1,
                                   ValueF) then
      begin
        if (ValueF > 0) and not FSfxEnabled then
          FSfxEnabled := True;

        FSfxVolume := ValueF;
      end;

    FGUI.EndWindow;
  FGUI.Finish;
end;

cheers,
Paul