Draw on canvas/texture

[Daniel]

Hello everyone!

I need to draw lines and text in runtime, it can either be on a Hudsprite or directly on the SceneViewer.
How would I do that, and which way is faster?

Kind regards and thanks in advance,
Daniel

[shine world]

I write HUD Text using this code:

    // private data declaration
    FUserMessageHud: TGLHudText;
    FUserMessageHudBitmapFont: TGLWindowsBitmapFont;
...
..
...
  // form class constructor

  // creates and sets user message objects
  FUserMessageHudBitmapFont := TGLWindowsBitmapFont.Create(Self);
  FUserMessageHudBitmapFont.Font.Color := clYellow;
  FUserMessageHudBitmapFont.Font.Name := 'Tahoma';
  FUserMessageHudBitmapFont.Font.Size := 22;

  FUserMessageHud := TGLHudText.Create(GLSceneViewer);
  FUserMessageHud.BitmapFont := FUserMessageHudBitmapFont;
  FUserMessageHud.Text := '';
  FUserMessageHud.Visible := False;
  GLScene.Objects.AddChild(FUserMessageHud);
...
..
...
    // draws text in scene
    GLScene.BeginUpdate;
    try
      FUserMessageHud.Text := Value;
      FUserMessageHud.Position.X := 10;
      FUserMessageHud.Position.Y := 10;
      FUserMessageHud.Visible := True;
    finally
      GLScene.EndUpdate;
    end;

[Daniel]

Thanks! I will try this!

But still I need to be able to draw lines on a 2d canvas.
Is there a fast way to draw on a HUDSprite for example?
Do I have to draw on a bitmap and assign it to the HUDSprite every frame?

[Jerome.D (BeanzMaster)]

Hi Daniel, for drawing on canvas you can use TGLCanvas and a TGLDirectRender, see sample in Bench/Canvas

Cheers

[Daniel]

Cool! That seems to be what I need. I will try it out.
Thanks again!!