/// <summary>
/// Pops the specified parent element.
/// </summary>
/// <param name="gl">The OpenGL instance.</param>
/// <param name="parentElement">The parent element.</param>
public override void Pop(OpenGL gl, SceneElement parentElement)
{
LookAtCamera camera = parentElement.TraverseToRootElement().ParentScene.CurrentCamera as LookAtCamera;
if (camera != null)
{
gl.Viewport(0, 0, result[2], result[3]);
}
// Pop the stack.
gl.PopMatrix();
}
/// <summary>
/// Pushes the effect onto the specified parent element.
/// </summary>
/// <param name="gl">The OpenGL instance.</param>
/// <param name="parentElement">The parent element.</param>
public override void Push(OpenGL gl, SceneElement parentElement)
{
// Push the stack.
gl.PushMatrix();
LookAtCamera camera = parentElement.TraverseToRootElement().ParentScene.CurrentCamera as LookAtCamera;
if (camera != null)
{
SetTranslate(gl, camera);
const int width = 200;
gl.GetInteger(OpenGL.GL_VIEWPORT, result);
gl.Viewport(0, 0, width, width * result[3] / result[2]);
}
// Perform the transformation.
linearTransformation.Transform(gl);
}
/// <summary>
/// Pushes the effect onto the specified parent element.
/// </summary>
/// <param name="gl">The OpenGL instance.</param>
/// <param name="parentElement">The parent element.</param>
public override void Push(OpenGL gl, SceneElement parentElement)
{
// Push the stack.
gl.PushMatrix();
// Try to get the scene's camera.
if (this.arcBall.Camera == null)
{
SceneContainer container = parentElement.TraverseToRootElement();
if (container != null)
{
Scene scene = container.ParentScene;
IScientificCamera camera = scene.CurrentCamera as IScientificCamera;
this.arcBall.Camera = camera;
}
}
// Perform the transformation.
arcBall.TransformMatrix(gl);
}
