// Only constructor.
public BookViewport(Visual[] visuals)
{
InitializeComponent();
if (visuals == null)
{
return;
}
// Get the number of leaves.
leafCount = (visuals.Length + 1) / 2;
for (int i = 0; i < leafCount; i++)
{
// Create Billboard object for each leaf.
Billboard board = new Billboard();
board.Slices = 48;
board.Stacks = 24;
board.UpperLeft = new Point3D(0, 5.5, 0);
board.UpperRight = new Point3D(0, 5.5, 8.5);
board.LowerLeft = new Point3D(0, -5.5, 0);
board.LowerRight = new Point3D(0, -5.5, 8.5);
// Set the top brush to a recto.
VisualBrush visbrush = new VisualBrush(visuals[2 * i]);
RenderOptions.SetCachingHint(visbrush, CachingHint.Cache);
board.Material = new DiffuseMaterial(visbrush);
// Set the back brush to a verso.
visbrush = new VisualBrush(visuals[2 * i + 1]);
visbrush.Transform = new ScaleTransform(-1, 1, 0.5, 0);
RenderOptions.SetCachingHint(visbrush, CachingHint.Cache);
board.BackMaterial = new DiffuseMaterial(visbrush);
// Calculate the offset from the center for the leaf.
double spineOffset = leafGap * (i - leafCount / 2);
board.Transform = new TranslateTransform3D(spineOffset, 0, 0);
// Create a PageTurner object for each leaf.
PageTurner pgturn = new PageTurner();
pgturn.Angle = 90;
pgturn.Radius = (leafCount - i) * leafGap;
board.AlgorithmicTransforms.Add(pgturn);
// Add the board to the Viewport3D and also a collection.
Children.Add(board);
lstBillboards.Add(board);
}
}
// Animate leaf when user clicks a page.
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs args)
{
Point pt = args.GetPosition(this);
HitTestResult result = VisualTreeHelper.HitTest(this, pt);
if (result is RayMeshGeometry3DHitTestResult)
{
RayMeshGeometry3DHitTestResult result3d =
result as RayMeshGeometry3DHitTestResult;
if (result3d.VisualHit is Billboard)
{
// Get the clicked billboard and prepare for animations.
Billboard board = result3d.VisualHit as Billboard;
int indexBillboard = lstBillboards.IndexOf(board);
Billboard boardAnimate = null;
// Clicked a recto: forward page turn (right to left).
if (indexBillboard >= leafView)
{
boardAnimate = lstBillboards[leafView];
animaAngle.To = -90;
animaRadius.To = (leafView + 1) * leafGap;
leafView++;
}
// Clicked a verso: back page turn (left to right).
else
{
boardAnimate = lstBillboards[leafView - 1];
animaAngle.To = 90;
animaRadius.To = (leafCount - leafView + 1) * leafGap;
leafView--;
}
// Start the animations.
PageTurner turn =
boardAnimate.AlgorithmicTransforms[0] as PageTurner;
turn.Random1 = rand.NextDouble() - 0.5;
turn.Random2 = rand.NextDouble() - 0.5;
turn.BeginAnimation(PageTurner.AngleProperty, animaAngle);
turn.BeginAnimation(PageTurner.RadiusProperty, animaRadius);
}
}
}
