using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media.Media3D;
using System.Windows.Threading;
using System.Xml.Linq;
// Implementation of the Image Flow View using Windows Presentation Foundation (WPF).
// Major parts of the code have been taken from the 'WPF Cover Flow Tutorial':
// http://d3dal3.blogspot.com/2008/10/wpf-cover-flow-tutorial-part-1.html
namespace DICOMViewer.ImageFlow
{
public partial class ImageFlowView : Window
{
private DispatcherTimer mSliderDelayTimer = new DispatcherTimer();
private DispatcherTimer mAnimationTimer = new DispatcherTimer();
private DispatcherTimer mUserInputBlockTimer = new DispatcherTimer();
private int mCurrentViewPosition = 0;
private readonly TimeSpan mAnimationDuration = TimeSpan.FromMilliseconds(600);
private readonly int HalfPageSize = 5;
private readonly double StepSize = 0.1;
private readonly Dictionary<int, ImageSlice> mImageSliceList = new Dictionary<int, ImageSlice>();
public ImageFlowView()
{
InitializeComponent();
this.KeyDown += new KeyEventHandler(this.UserControl_KeyDown);
this.KeyUp += new KeyEventHandler(this.UserControl_KeyUp);
mAnimationTimer.Interval = mAnimationDuration;
mAnimationTimer.Tick += new EventHandler(AnimationTimerEventHandler);
mSliderDelayTimer.Interval = TimeSpan.FromMilliseconds(100);
mSliderDelayTimer.Tick += new EventHandler(SliderDelayTimerEventHandler);
mUserInputBlockTimer.Interval = TimeSpan.FromMilliseconds(10);
mUserInputBlockTimer.Tick += new EventHandler(UserInputBlockTimerEventHandler);
}
public void MoveToNextImage()
{
if (mCurrentViewPosition < mImageSliceList.Count - 1)
{
if (mImageSliceList.ContainsKey(mCurrentViewPosition - HalfPageSize))
mImageSliceList[mCurrentViewPosition - HalfPageSize].ResetBitmap();
if (mImageSliceList.ContainsKey(mCurrentViewPosition + HalfPageSize))
mImageSliceList[mCurrentViewPosition + HalfPageSize].SetBitmap();
TransformImageSlice(mCurrentViewPosition, mCurrentViewPosition + HalfPageSize);
// Increment current ViewPosition
mCurrentViewPosition++;
// ImageSlice, which has the focus, has to be moved to the background
AnimateImageSlice(mCurrentViewPosition, mCurrentViewPosition - 1);
// Next ImageSlice has to be brought to the foreground
AnimateImageSlice(mCurrentViewPosition, mCurrentViewPosition);
// Move Camera to new position
mCamera.Position = new Point3D(StepSize * mCurrentViewPosition, mCamera.Position.Y, mCamera.Position.Z);
// Update Info Label
UpdateInfoLabel();
// Update Slider
Slider.Value = mCurrentViewPosition;
// Start Animation Timer to block further user input until animation is done
mAnimationTimer.Start();
}
}
public void MoveToPreviousImage()
{
if (mCurrentViewPosition > 0)
{
if (mImageSliceList.ContainsKey(mCurrentViewPosition + HalfPageSize))
mImageSliceList[mCurrentViewPosition + HalfPageSize].ResetBitmap();
if (mImageSliceList.ContainsKey(mCurrentViewPosition - HalfPageSize))
mImageSliceList[mCurrentViewPosition - HalfPageSize].SetBitmap();
TransformImageSlice(mCurrentViewPosition, mCurrentViewPosition - HalfPageSize);
// Decrement current ViewPosition
mCurrentViewPosition--;
// ImageSlice, which has the focus, has to be moved to the background
AnimateImageSlice(mCurrentViewPosition, mCurrentViewPosition + 1);
// Next ImageSlice has to be brought to the foreground
AnimateImageSlice(mCurrentViewPosition, mCurrentViewPosition);
// Move Camera to new position
mCamera.Position = new Point3D(StepSize * mCurrentViewPosition, mCamera.Position.Y, mCamera.Position.Z);
// Update Info Label
UpdateInfoLabel();
// Update Slider
Slider.Value = mCurrentViewPosition;
// Start Animation Timer to block further user input until animation is done
mAnimationTimer.Start();
}
}
public void AddImageSlice(XDocument theXDocument, string theFileName, string theZValue)
{
ImageSlice newImageSlice = new ImageSlice(theXDocument, theFileName, theZValue, the3DModel);
// Insert new Image Slice at the end
mImageSliceList.Add(mImageSliceList.Count, newImageSlice);
}
public void PostInitialize()
{
mCurrentViewPosition = mImageSliceList.Count / 2;
// Update min/max value of Slider
Slider.Minimum = 0;
Slider.Maximum = mImageSliceList.Count - 1;
ShowImage(mCurrentViewPosition);
ShowDefocusedImages();
}
// Moves slice (with index equal to 'theSliceIndex') to it's new view position
// Movement is done animated
private void AnimateImageSlice(int theViewPosition, int theSliceIndex)
{
double aRotationAngle = RotationAngle(theViewPosition, theSliceIndex);
double aTranslationX = TranslationX(theViewPosition, theSliceIndex);
double aTranslationY = TranslationY(theViewPosition, theSliceIndex);
double aTranslationZ = TranslationZ(theViewPosition, theSliceIndex);
if (mImageSliceList.ContainsKey(theSliceIndex))
mImageSliceList[theSliceIndex].Animate(aRotationAngle, aTranslationX, aTranslationY, aTranslationZ, mAnimationDuration);
}
// Moves slice (with index equal to 'theSliceIndex') to it's new view position
// Movement is done without animation (transformation only)
private void TransformImageSlice(int theViewPosition, int theSliceIndex)
{
double aRotationAngle = RotationAngle(theViewPosition, theSliceIndex);
double aTranslationX = TranslationX(theViewPosition, theSliceIndex);
double aTranslationY = TranslationY(theViewPosition, theSliceIndex);
double aTranslationZ = TranslationZ(theViewPosition, theSliceIndex);
if (mImageSliceList.ContainsKey(theSliceIndex))
mImageSliceList[theSliceIndex].Transform(aRotationAngle, aTranslationX, aTranslationY, aTranslationZ);
}
private double RotationAngle(int aViewPosition, int aSlicePosition)
{
return Math.Sign(aSlicePosition - aViewPosition) * -90;
}
private double TranslationX(int aViewPosition, int aSlicePosition)
{
return aSlicePosition * StepSize + Math.Sign(aSlicePosition - aViewPosition) * 3.5;
}
private double TranslationY(int aViewPosition, int aSlicePosition)
{
return 0;
}
private double TranslationZ(int aViewPosition, int aSlicePosition)
{
return aSlicePosition == aViewPosition ? 1 : -3;
}
private void RemoveDefocusedImages()
{
for (int i = mCurrentViewPosition - HalfPageSize - 10; i < mCurrentViewPosition + HalfPageSize + 10; i++)
{
if (i != mCurrentViewPosition)
{
if (mImageSliceList.ContainsKey(i))
mImageSliceList[i].ResetBitmap();
}
}
}
private void ShowDefocusedImages()
{
for (int i = mCurrentViewPosition - HalfPageSize; i < mCurrentViewPosition + HalfPageSize; i++)
{
if (i != mCurrentViewPosition)
{
if (mImageSliceList.ContainsKey(i))
mImageSliceList[i].SetBitmap();
TransformImageSlice(mCurrentViewPosition, i);
}
}
}
private void ShowImage(int newPosition)
{
if (newPosition < 0 || newPosition > mImageSliceList.Count - 1)
return;
if (mImageSliceList.ContainsKey(mCurrentViewPosition))
mImageSliceList[mCurrentViewPosition].ResetBitmap();
mCurrentViewPosition = newPosition;
if (mImageSliceList.ContainsKey(mCurrentViewPosition))
mImageSliceList[mCurrentViewPosition].SetBitmap();
TransformImageSlice(mCurrentViewPosition, mCurrentViewPosition);
// Move Camera to new position
mCamera.Position = new Point3D(StepSize * mCurrentViewPosition, mCamera.Position.Y, mCamera.Position.Z);
// Update Info Label
UpdateInfoLabel();
// Update Slider
Slider.Value = mCurrentViewPosition;
}
private void SliderDelayTimerEventHandler(Object sender, EventArgs args)
{
int SliderValue = Convert.ToInt32(Slider.Value);
if (SliderValue == mCurrentViewPosition)
return;
ShowImage(SliderValue);
}
private void AnimationTimerEventHandler(Object sender, EventArgs args)
{
mAnimationTimer.Stop();
}
private void UserInputBlockTimerEventHandler(Object sender, EventArgs args)
{
mUserInputBlockTimer.Stop();
}
private void MovieTimerEventHandler(Object sender, EventArgs args)
{
if (mCurrentViewPosition == mImageSliceList.Count - 1)
ShowImage(0);
else
ShowImage(mCurrentViewPosition + 1);
}
private void SliderDragCompleted(object sender, EventArgs e)
{
mSliderDelayTimer.Stop();
ShowDefocusedImages();
}
private void SliderDragStarted(object sender, EventArgs e)
{
mSliderDelayTimer.Start();
RemoveDefocusedImages();
}
public void UpdateInfoLabel()
{
mInfoLabel.Text = string.Format("Slice {0} of {1} (Z-Value: {2})\n", mCurrentViewPosition + 1, mImageSliceList.Count, mImageSliceList[mCurrentViewPosition].ZValue);
string[] split = mImageSliceList[mCurrentViewPosition].FileName.Split(new Char[] { '\\' });
string aFileName = split[split.Length - 1];
mInfoLabel.Text += string.Format("File: {0}", aFileName);
}
public void UserControl_KeyDown(object sender, KeyEventArgs e)
{
e.Handled = true;
if (mUserInputBlockTimer.IsEnabled)
return;
switch (e.Key)
{
case Key.Right:
if (Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift))
ShowImage(mCurrentViewPosition + 1);
else
MoveToNextImage();
break;
case Key.Left:
if (Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift))
ShowImage(mCurrentViewPosition - 1);
else
MoveToPreviousImage();
break;
case Key.LeftShift:
case Key.RightShift:
RemoveDefocusedImages();
break;
}
mUserInputBlockTimer.Start();
}
public void UserControl_KeyUp(object sender, KeyEventArgs e)
{
e.Handled = true;
switch (e.Key)
{
case Key.LeftShift:
case Key.RightShift:
ShowDefocusedImages();
break;
}
}
private void UserControl_MouseWheel(object sender, MouseWheelEventArgs e)
{
e.Handled = true;
if (mUserInputBlockTimer.IsEnabled)
return;
if (e.Delta > 0)
{
if (Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift))
ShowImage(mCurrentViewPosition + 1);
else
MoveToNextImage();
}
else
{
if (Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift))
ShowImage(mCurrentViewPosition - 1);
else
MoveToPreviousImage();
}
mUserInputBlockTimer.Start();
}
}
}
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