constructor TMyOpenGLPanel.Create(AOwner: TComponent); begin inherited Create(AOwner); FAngle := 0; FTimer := TTimer.Create(Self); FTimer.Interval := 30; // ~33 FPS FTimer.OnTimer := OnTimer; FTimer.Enabled := False; end;
end. procedure TForm1.FormCreate(Sender: TObject); begin var Panel := TMyOpenGLPanel.Create(Self); Panel.Parent := Self; Panel.Align := TAlignLayout.Client; Panel.StartAnimation; end; Custom Helper (simplified cube drawing) Add this to the implementation section or a separate unit:
ViewMat := TMatrix.CreateLookAt( Point3D(0, 2, 5), // Eye position Point3D(0, 0, 0), // Look-at center Point3D(0, 1, 0) // Up vector ); TOpenGlPanel
ProjMat := TMatrix.CreatePerspectiveFovRH( DegToRad(60), // Field of view Width / Max(Height, 1), // Aspect ratio 0.1, 100.0 // Near/far planes );
type TOpenGLContextHelper = class helper for TContext3D public procedure DrawCubeFace(FaceIndex: Integer; Size: Single); end; implementation constructor TMyOpenGLPanel
// Draw a cube (6 faces) for i := 0 to 5 do begin case i of 0: Context.SetColor($FFFF0000); // Red - front 1: Context.SetColor($FF00FF00); // Green - back 2: Context.SetColor($FF0000FF); // Blue - top 3: Context.SetColor($FFFFFF00); // Yellow - bottom 4: Context.SetColor($FFFF00FF); // Magenta - left 5: Context.SetColor($FF00FFFF); // Cyan - right end;
procedure TMyOpenGLPanel.OnTimer(Sender: TObject); begin FAngle := FAngle + 2; if FAngle >= 360 then FAngle := FAngle - 360; Repaint; // triggers Paint method end; constructor TMyOpenGLPanel.Create(AOwner: TComponent)
procedure TMyOpenGLPanel.Paint; var ModelMat, ViewMat, ProjMat: TMatrix; Center: TPoint3D; i: Integer; begin inherited; if not Assigned(Context) then Exit;