public override void PresentStep(int switchIndex, PresentationViewController presentationViewController)
{
switch (switchIndex)
{
case 0:
// Set the slide's title and subtitle and add some text
TextManager.SetTitle("Core Image");
TextManager.SetSubtitle("CI Filters");
TextManager.AddBulletAtLevel("Screen-space effects", 0);
TextManager.AddBulletAtLevel("Applies to a node hierarchy", 0);
TextManager.AddBulletAtLevel("Filter parameters are animatable", 0);
TextManager.AddCode("#aNode.#Filters# = new CIFilter[] { filter1, filter2 };#");
break;
case 1:
SCNTransaction.Begin();
SCNTransaction.AnimationDuration = 1.0f;
// Dim the text and move back a little
TextManager.TextNode.Opacity = 0.0f;
presentationViewController.CameraHandle.Position = presentationViewController.CameraNode.ConvertPositionToNode(new SCNVector3(0, 0, 5.0f), presentationViewController.CameraHandle.ParentNode);
SCNTransaction.Commit();
// Reveal the grid
GroupNode.Opacity = 1;
break;
case 2:
SCNTransaction.Begin();
SCNTransaction.AnimationDuration = 1;
// Highlight an item
HighlightContact(13, presentationViewController);
SCNTransaction.Commit();
break;
case 3:
var index = 13;
var subStep = 0;
// Successively select items
for (var i = 0; i < 5; ++i)
{
var popTime = new DispatchTime(DispatchTime.Now, (long)(i * 0.2 * Utils.NSEC_PER_SEC));
DispatchQueue.MainQueue.DispatchAfter(popTime, () => {
SCNTransaction.Begin();
SCNTransaction.AnimationDuration = 0.2f;
UnhighlightContact(index);
if (subStep++ == 3)
{
index += ColumnCount;
}
else
{
index++;
}
HighlightContact(index, presentationViewController);
SCNTransaction.Commit();
});
}
break;
case 4:
// BLUR+DESATURATE in the background, GLOW in the foreground
// Here we will change the node hierarchy in order to group all the nodes in the background under a single node.
// This way we can use a single Core Image filter and apply it on the whole grid, and have another CI filter for the node in the foreground.
var selectionParent = HeroNode.ParentNode;
SCNTransaction.Begin();
SCNTransaction.AnimationDuration = 0;
// Stop the animations of the selected node
HeroNode.Transform = HeroNode.PresentationNode.Transform; // set the current rotation to the current presentation value
HeroNode.RemoveAllAnimations();
// Re-parent the node by preserving its world tranform
var wantedWorldTransform = selectionParent.WorldTransform;
GroupNode.ParentNode.AddChildNode(selectionParent);
selectionParent.Transform = selectionParent.ParentNode.ConvertTransformFromNode(wantedWorldTransform, null);
SCNTransaction.Commit();
// Add CIFilters
SCNTransaction.Begin();
SCNTransaction.AnimationDuration = 1;
// A negative 'centerX' value means no scaling.
//TODO HeroNode.Filters [0].SetValueForKey (new NSNumber (-1), new NSString ("centerX"));
// Move the selection to the foreground
selectionParent.Rotation = new SCNVector4(0, 1, 0, 0);
HeroNode.Transform = ContentNode.ConvertTransformToNode(SCNMatrix4.CreateTranslation(0, Altitude, 29), selectionParent);
HeroNode.Scale = new SCNVector3(1, 1, 1);
HeroNode.Rotation = new SCNVector4(1, 0, 0, -(float)(Math.PI / 4) * 0.25f);
// Upon completion, rotate the selection forever
SCNTransaction.SetCompletionBlock(() => {
var animation = CABasicAnimation.FromKeyPath("rotation");
animation.Duration = 4.0f;
animation.From = NSValue.FromVector(new SCNVector4(0, 1, 0, 0));
animation.To = NSValue.FromVector(new SCNVector4(0, 1, 0, NMath.PI * 2));
animation.TimingFunction = CAMediaTimingFunction.FromName(CAMediaTimingFunction.EaseInEaseOut);
animation.RepeatCount = float.MaxValue;
HeroNode.ChildNodes [0].AddAnimation(animation, new NSString("heroNodeAnimation"));
});
// Add the filters
var blurFilter = CIFilter.FromName("CIGaussianBlur");
blurFilter.SetDefaults();
blurFilter.Name = "blur";
blurFilter.SetValueForKey(new NSNumber(0), CIFilterInputKey.Radius);
var desaturateFilter = CIFilter.FromName("CIColorControls");
desaturateFilter.SetDefaults();
desaturateFilter.Name = "desaturate";
GroupNode.Filters = new CIFilter[] { blurFilter, desaturateFilter };
SCNTransaction.Commit();
// Increate the blur radius and desaturate progressively
SCNTransaction.Begin();
SCNTransaction.AnimationDuration = 2;
GroupNode.SetValueForKey(new NSNumber(10), new NSString("filters.blur.inputRadius"));
GroupNode.SetValueForKey(new NSNumber(0.1), new NSString("filters.desaturate.inputSaturation"));
SCNTransaction.Commit();
break;
}
}