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C# WPF ellipse bouncing on rectangle

I'm trying to make a solo pong game for a school project, but I don't know how to handle the ellipse bouncing on the rectangle. They're both inside a canvas as you can see in the XAML, I'll leave my code, please I need help, because I'm stuck at this point.
I tried different ways, but I can't figure it out, so any tip will be helpful!
<Window x:Class="PongSolo.Game"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:PongSolo"
mc:Ignorable="d"
Title="Game" Height="450" Width="650" Closing="Game_Closing" WindowStartupLocation="CenterScreen" Loaded="Window_Loaded">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition Height="5*"></RowDefinition>
</Grid.RowDefinitions>
<Border Name="superBorder" BorderBrush="Black" BorderThickness="10" Grid.Row="1">
<Canvas Name="superCanvas">
<Rectangle x:Name="superRect" Fill="Blue" Width="100" Height="15" Canvas.Bottom="0" Canvas.Left="0"/>
<Ellipse x:Name="superElly" Fill="Purple" Width="20" Height="20" Grid.Row="1" Canvas.Top="0" Canvas.Left="0"/>
</Canvas>
</Border>
<Label Content="Punteggio:" FontWeight="Bold" FontSize="20" Grid.Row="0"/>
<Label Content="0" Name="scoreLabel" FontWeight="Bold" FontSize="20" Grid.Row="0" Margin="119,0,-119,0"/>
</Grid>
</Window>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Media;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Threading;
namespace PongSolo
{
/// <summary>
/// Logica di interazione per Game.xaml
/// </summary>
public partial class Game : Window
{
SoundPlayer sound = new System.Media.SoundPlayer(Environment.CurrentDirectory+"/Resources/bgm_new.wav");
DispatcherTimer playerDispatcher = new DispatcherTimer();
DispatcherTimer ballDispatcher = new DispatcherTimer();
int score = 0;
double startxspeed = 4;
double startyspeed = 4;
public Game()
{
InitializeComponent();
playerDispatcher.Interval = TimeSpan.FromMilliseconds(10);
ballDispatcher.Interval = TimeSpan.FromMilliseconds(10);
ballDispatcher.Tick += ballMovement;
playerDispatcher.Tick += playerMovement;
playerDispatcher.Start();
ballDispatcher.Start();
}
private void ballMovement(object sender, EventArgs e)
{
double xspeed = Canvas.GetLeft(superElly) + startxspeed;
double yspeed = Canvas.GetTop(superElly) + startyspeed;
//Ball collision with rectangle
if(/*bouncing statement*/)
{
score++;
scoreLabel.Content = score.ToString();
startyspeed *= -1;
}
//up collision
if (yspeed < (superCanvas.ActualHeight - (superElly.ActualHeight / 2)) && yspeed > 0)
Canvas.SetTop(superElly, yspeed);
else
{
startyspeed *= -1;
}
//down collision
if(yspeed >= (superCanvas.ActualHeight - (superElly.ActualHeight/2)) && yspeed >0)
{
playerDispatcher.Stop();
ballDispatcher.Stop();
}
//lateral collision
if (xspeed < (superCanvas.ActualWidth - (superElly.ActualWidth / 2 + 10)) && xspeed > 0)
Canvas.SetLeft(superElly, xspeed);
else
{
startxspeed *= -1;
}
}
private void playerMovement(object sender, EventArgs e)
{
double xvalue = Canvas.GetLeft(superRect) + 3;
if (Keyboard.IsKeyDown(Key.Left))
{
if (!outOfBoundaries("left"))
MovePlayerLeft();
}
if (Keyboard.IsKeyDown(Key.Right))
{
if (!outOfBoundaries("right"))
MovePlayerRight();
}
}
public bool outOfBoundaries(string s)
{
bool is_out_of_boundaries = false;
switch (s)
{
case "left":
{
if (Canvas.GetLeft(superRect) <= 0)
is_out_of_boundaries = true;
break;
}
case "right":
{
if (Canvas.GetLeft(superRect) >= superCanvas.ActualWidth-superRect.Width)
is_out_of_boundaries = true;
break;
}
default:
break;
}
return is_out_of_boundaries;
}
private void MovePlayerRight()
{
Canvas.SetLeft(superRect, Canvas.GetLeft(superRect) + 5);
}
private void MovePlayerLeft()
{
Canvas.SetLeft(superRect, Canvas.GetLeft(superRect) - 5);
}
private void Game_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
App.Current.Shutdown();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
this.MinHeight = 300;
this.MinWidth = 300;
PlayMusic();
}
private void PlayMusic()
{
sound.PlayLooping();
}
}
}

scrollbar not showing in stackpanel even after putting it inside a scrollviewer

I am trying to add a scroll viewer to stackpanels - "gradpaneldesc" , "undergrapaneldesc" and "certficatedesc" which are inside another parent stackpanel- "mainpanel" respectively, but I am unable to achieve this as its showing me scrollviewer perhaps but there is no actual scrollbar,not realizing where is the mistake. Any help will be highly appreciated.
XAML
<UserControl x:Class="ISTE.Views.CoursesView"XAML
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:ISTE.Views"
mc:Ignorable="d"
d:DesignHeight="600" d:DesignWidth="1300">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="400"/>
<ColumnDefinition Width="400"/>
<ColumnDefinition Width="400"/>
</Grid.ColumnDefinitions>
<Image Source="/Images/degree.jpg"
Stretch="Fill"
Height="250"
Grid.ColumnSpan="3"/>
<StackPanel x:Name="mainpanel1" Grid.Column="0">
<Button x:Name="Graduate" IsDefault="True" Click="Graduate_Click" >
<Button.Background>
<LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
<GradientStop Color="#FF235DF0" Offset="0"/>
<GradientStop Color="#FFE7EBF5" Offset="1"/>
<GradientStop Color="#FF9EB6F3" Offset="0.632"/>
</LinearGradientBrush>
</Button.Background> Graduate
</Button>
<StackPanel x:Name="gradpanel" Height="200px"></StackPanel>
<Border x:Name="myBorder2">
<ScrollViewer>
<StackPanel x:Name="gradpaneldesc" Height="200px"></StackPanel>
</ScrollViewer>
</Border>
</StackPanel>
<StackPanel x:Name="mainpanel2" Grid.Column="1">
<Button x:Name="UnderGraduate" IsDefault="True" Click="UnderGraduate_Click" >
<Button.Background>
<LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
<GradientStop Color="#FF235DF0" Offset="0"/>
<GradientStop Color="#FFE7EBF5" Offset="1"/>
<GradientStop Color="#FF9EB6F3" Offset="0.632"/>
</LinearGradientBrush>
</Button.Background> Undergraduate</Button>
<StackPanel x:Name="undergradpanel" Height="200px"></StackPanel>
<Border x:Name="myBorder1">
<ScrollViewer>
<StackPanel x:Name="undergradpaneldesc" Height="200px"></StackPanel>
</ScrollViewer>
</Border>
</StackPanel>
<StackPanel Grid.Column="2">
<Button x:Name="Certifications" IsDefault="True" Click="Certifications_Click" >
<Button.Background>
<LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
<GradientStop Color="#FF235DF0" Offset="0"/>
<GradientStop Color="#FFE7EBF5" Offset="1"/>
<GradientStop Color="#FF9EB6F3" Offset="0.632"/>
</LinearGradientBrush>
</Button.Background> Certifications</Button>
<StackPanel x:Name="certpanel" Height="200px"></StackPanel>
<Border x:Name="myBorder3">
<ScrollViewer>
<StackPanel x:Name="certificatedesc" Height="200px"></StackPanel>
</ScrollViewer>
</Border>
</StackPanel>
</Grid>
CS
using ISTE.Models;
using ISTE.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace ISTE.Views
{
/// <summary>
/// Interaction logic for CoursesView.xaml
/// </summary>
public partial class CoursesView : UserControl
{
CoursesVM vm;
public CoursesView()
{
InitializeComponent();
vm = new CoursesVM();
this.DataContext = vm;
vm.GetData();
}
bool flag=false;
bool flag1=false;
private void UnderGraduate_Click(object sender1, RoutedEventArgs e1)
{
if (flag1 == false)
{
foreach (Undergraduate grad in vm.ItemData.undergraduate)
{
var textb = new Button();
undergradpanel.Children.Add(textb);
textb.Content = grad.degreeName;
textb.Click += new RoutedEventHandler(ugdegreeEventHandler);
Console.WriteLine("graddegrees \t" + grad.degreeName);
}
}
flag1 = true;
}
void ugdegreeEventHandler(object sender2, RoutedEventArgs e2)
{
// Console.WriteLine("hi select");
var b = sender2 as Button;
// var textb2 = new TextBlock();
// textb2.Text
myBorder1.Background = Brushes.SkyBlue;
myBorder1.BorderBrush = Brushes.Blue;
myBorder1.BorderThickness = new Thickness(2);
myBorder1.CornerRadius = new CornerRadius(8);
myBorder1.Padding = new Thickness(6);
var degreeselected = b.Content.ToString();
if (undergradpaneldesc.Children.Count < 1)
{
var textb2 = new TextBlock();
textb2.Name = "textblock";
undergradpaneldesc.Children.Add(textb2);
foreach (Undergraduate grad in vm.ItemData.undergraduate)
{
if (grad.degreeName == degreeselected)
{
textb2.TextDecorations = TextDecorations.Underline;
textb2.Text = grad.description+"\n\n";
textb2.TextWrapping = TextWrapping.Wrap;
return;
}
}
}
else
{
foreach (Undergraduate grad in vm.ItemData.undergraduate)
{
if (grad.degreeName == degreeselected)
{
foreach (TextBlock ch in undergradpaneldesc.Children)
{
ch.Text = "";
ch.TextDecorations = TextDecorations.Underline;
ch.Text = grad.description+"\n\n";
ch.TextWrapping = TextWrapping.Wrap;
return;
}
}
}
}
}
private void Graduate_Click(object sender, RoutedEventArgs e)
{
if (flag == false)
{
foreach (Graduate grad in vm.ItemData.graduate)
{
var textb = new Button();
gradpanel.Children.Add(textb);
textb.Content = grad.degreeName;
textb.IsDefault = true;
textb.Click += new RoutedEventHandler(degreeEventHandler);
Console.WriteLine("graddegrees \t" + grad.degreeName);
}
}
flag = true;
}
void degreeEventHandler(object sender, RoutedEventArgs e)
{
// Console.WriteLine("hi select");
var b = sender as Button;
// var textb2 = new TextBlock();
// textb2.Text
var degreeselected = b.Content.ToString();
myBorder2.Background = Brushes.SkyBlue;
myBorder2.BorderBrush = Brushes.Black;
myBorder2.BorderThickness = new Thickness(2);
myBorder2.CornerRadius = new CornerRadius(8);
myBorder2.Padding = new Thickness(6);
if (gradpaneldesc.Children.Count<1)
{
var textb1 = new TextBlock();
textb1.Name = "textblock1";
gradpaneldesc.Children.Add(textb1);
foreach (Graduate grad in vm.ItemData.graduate)
{
if (grad.degreeName == degreeselected)
{
if (grad.degreeName != "graduate advanced certificates")
{
textb1.Text = grad.description;
textb1.TextDecorations = TextDecorations.Underline;
foreach (var conc in grad.concentrations)
{
textb1.Text += conc + "\n\n";
}
textb1.TextWrapping = TextWrapping.Wrap;
return;
}
else
{
textb1.TextDecorations = TextDecorations.Underline;
foreach (var conc in grad.availableCertificates)
{
textb1.Text += conc + "\n\n";
}
textb1.TextWrapping = TextWrapping.Wrap;
return;
}
}
}
}
else
{
foreach (Graduate grad in vm.ItemData.graduate)
{
if (grad.degreeName == degreeselected)
{
if (grad.degreeName != "graduate advanced certificates")
{
foreach (TextBlock ch in gradpaneldesc.Children)
{
ch.Text = "";
ch.Text = grad.description + "\n\n";
ch.TextDecorations = TextDecorations.Underline;
foreach (var conc in grad.concentrations)
{
ch.Text += conc + "\n";
}
ch.TextWrapping = TextWrapping.Wrap;
return;
}
}
else
{
foreach (TextBlock ch in gradpaneldesc.Children)
{
ch.Text = "";
ch.TextDecorations = TextDecorations.Underline;
foreach (var conc in grad.availableCertificates)
{
ch.Text += conc + "\n";
}
ch.TextWrapping = TextWrapping.Wrap;
return;
}
}
}
}
}
}
private void Certifications_Click(object sender, RoutedEventArgs e)
{
var textb3 = new TextBlock();
textb3.Name = "textblock3";
certificatedesc.Children.Add(textb3);
textb3.TextDecorations = TextDecorations.Underline;
myBorder3.Background = Brushes.SkyBlue;
myBorder3.BorderBrush = Brushes.Black;
myBorder3.BorderThickness = new Thickness(2);
myBorder3.CornerRadius = new CornerRadius(8);
myBorder3.Padding = new Thickness(6);
foreach (Graduate grad in vm.ItemData.graduate)
{
if (grad.degreeName == "graduate advanced certificates")
{
textb3.Text = grad.description;
textb3.TextDecorations = TextDecorations.Underline;
foreach (var conc in grad.availableCertificates)
{
textb3.Text += conc + "\n\n";
}
textb3.TextWrapping = TextWrapping.Wrap;
return;
}
}
}
}
}

You need to specify the height of the ScrollViewer not the StackPanel, because otherwise the StackPanel won't extend beyond the bounds of the ScrollViewer and the scroll bar won't display.
<Border x:Name="myBorder2">
<ScrollViewer Height="200px">
<StackPanel x:Name="gradpaneldesc">
</StackPanel>
</ScrollViewer>
</Border>

Clipping Using Ellipse and binding it inside my user control in Windows RT

I have an image and I am clipping the mouse area using an Ellipse in which I am quite successful.
But I want that ellipse to be a part of my user control and the user control should move along with my finger and the clipping Ellipse should be inside the user control .
The complete project can be downloaded from here
My UserControl'sXAML is
<UserControl
x:Class="App78.Magnifier"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App78"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Height="230"
Width="170">
<Grid Height="230" Width="170">
<Path Data="M25.533,0C15.457,0,7.262,8.199,7.262,18.271c0,9.461,13.676,19.698,17.63,32.338 c0.085,0.273,0.34,0.459,0.626,0.457c0.287-0.004,0.538-0.192,0.619-0.467c3.836-12.951,17.666-22.856,17.667-32.33 C43.803,8.199,35.607,0,25.533,0z M25.533,32.131c-7.9,0-14.328-6.429-14.328-14.328c0-7.9,6.428-14.328,14.328-14.328 c7.898,0,14.327,6.428,14.327,14.328C39.86,25.702,33.431,32.131,25.533,32.131z"
Fill="#FFF4F4F5"
Stretch="Fill"
Stroke="Black"
UseLayoutRounding="False"
Height="227"
Width="171" ></Path>
<Ellipse x:Name="MagnifierEllipse" x:FieldModifier="public" Opacity="1" Visibility="Visible" HorizontalAlignment="Left" VerticalAlignment="Top" IsHitTestVisible="False" Width="150" Height="150" Stroke="White" StrokeThickness="3" Margin="11,8,0,0" >
<Ellipse.RenderTransform>
<TranslateTransform x:Name="MagnifierTransform" x:FieldModifier="public"/>
</Ellipse.RenderTransform>
<Ellipse.Fill>
<ImageBrush
ImageSource="http://blog.al.com/space-news/2009/04/iss015e22574.jpg"
Stretch="None"
AlignmentX="Left"
AlignmentY="Top">
<ImageBrush.Transform>
<TransformGroup>
<TranslateTransform x:FieldModifier="public"
x:Name="PositionTransform"/>
<ScaleTransform x:FieldModifier="public"
x:Name="ZoomTransform"/>
<TranslateTransform x:FieldModifier="public"
x:Name="CenterTransform" />
</TransformGroup>
</ImageBrush.Transform>
</ImageBrush>
</Ellipse.Fill>
</Ellipse>
</Grid>
</UserControl>
My MainPage.XAML is
<Page
x:Class="App78.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App78"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid
x:Name="LayoutGrid"
Margin="0,0"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
Holding="LayoutGrid_Holding"
PointerMoved="LayoutGrid_OnPointerMoved"
PointerWheelChanged="LayoutGrid_OnPointerWheelChanged">
<Image
x:Name="BigImage"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Stretch="Uniform"
Source="http://blog.al.com/space-news/2009/04/iss015e22574.jpg" />
<!--<Ellipse
x:Name="MagnifierEllipse"
Opacity="1"
Visibility="Collapsed"
HorizontalAlignment="Left"
VerticalAlignment="Top"
IsHitTestVisible="False"
Width="150"
Height="150"
Stroke="White"
StrokeThickness="3"
Margin="-100">
<Ellipse.RenderTransform>
<TranslateTransform
x:Name="MagnifierTransform"/>
</Ellipse.RenderTransform>
<Ellipse.Fill>
<ImageBrush
ImageSource="http://blog.al.com/space-news/2009/04/iss015e22574.jpg"
Stretch="None"
AlignmentX="Left"
AlignmentY="Top">
<ImageBrush.Transform>
<TransformGroup>
<TranslateTransform
x:Name="PositionTransform"/>
<ScaleTransform
x:Name="ZoomTransform"/>
<TranslateTransform
x:Name="CenterTransform" />
</TransformGroup>
</ImageBrush.Transform>
</ImageBrush>
</Ellipse.Fill>
</Ellipse>-->
<local:Magnifier x:Name="MagnifierTip" Visibility="Visible" />
</Grid>
</Page>
Please see the commented section of Ellipse , If I uncomment , I clearly get a Ellipse that is doing the clip.
My main requirenment is to get the Ellipse inside the user control , please refer the video for more clarification
My MainPage.XAML.CS has the following code
using System;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Media.Imaging;
namespace App78
{
public sealed partial class MainPage : Page
{
private double zoomScale = 2;
private double pointerX = 0;
private double pointerY = 0;
private const double MinZoomScale = .25;
private const double MaxZoomScale = 32;
public MainPage()
{
this.InitializeComponent();
var bi = (BitmapImage)BigImage.Source;
bi.ImageOpened += bi_ImageOpened;
this.SizeChanged += MainPage_SizeChanged;
}
void MainPage_SizeChanged(object sender, Windows.UI.Xaml.SizeChangedEventArgs e)
{
this.UpdateImageLayout();
}
void bi_ImageOpened(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
this.UpdateImageLayout();
}
private void UpdateImageLayout()
{
var bi = (BitmapImage)BigImage.Source;
if (bi.PixelWidth < this.LayoutGrid.ActualWidth &&
bi.PixelHeight < this.LayoutGrid.ActualHeight)
{
this.BigImage.Stretch = Stretch.None;
}
else
{
this.BigImage.Stretch = Stretch.Uniform;
}
this.UpdateMagnifier();
}
private void LayoutGrid_OnPointerMoved(object sender, PointerRoutedEventArgs e)
{
// MagnifierTip.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
var point = e.GetCurrentPoint(this.LayoutGrid);
this.pointerX = point.Position.X;
this.pointerY = point.Position.Y;
this.UpdateMagnifier();
}
private void UpdateMagnifier()
{
var bi = (BitmapImage)BigImage.Source;
double offsetX = 0;
double offsetY = 0;
double imageScale = 1;
var imageRatio = (double)bi.PixelWidth / bi.PixelHeight;
var gridRatio = this.LayoutGrid.ActualWidth / this.LayoutGrid.ActualHeight;
if (bi.PixelWidth < this.LayoutGrid.ActualWidth &&
bi.PixelHeight < this.LayoutGrid.ActualHeight)
{
offsetX = 0.5 * (this.LayoutGrid.ActualWidth - bi.PixelWidth);
offsetY = 0.5 * (this.LayoutGrid.ActualHeight - bi.PixelHeight);
//imageScale = 1; - remains
}
else if (imageRatio < gridRatio)
{
offsetX = 0.5 * (this.LayoutGrid.ActualWidth - imageRatio * this.LayoutGrid.ActualHeight);
offsetY = 0;
imageScale = BigImage.ActualHeight / bi.PixelHeight;
}
else
{
offsetX = 0;
offsetY = 0.5 * (this.LayoutGrid.ActualHeight - this.LayoutGrid.ActualWidth / imageRatio);
imageScale = BigImage.ActualWidth / bi.PixelWidth;
}
MagnifierTip.MagnifierTransform.X = this.pointerX;
MagnifierTip.MagnifierTransform.Y = this.pointerY;
MagnifierTip.PositionTransform.X = (-this.pointerX + offsetX) / imageScale;
MagnifierTip.PositionTransform.Y = (-this.pointerY + offsetY) / imageScale;
MagnifierTip. ZoomTransform.ScaleX = imageScale * zoomScale;
MagnifierTip.ZoomTransform.ScaleY = imageScale * zoomScale;
MagnifierTip.CenterTransform.X = MagnifierTip.MagnifierEllipse.ActualWidth / 2 - MagnifierTip.MagnifierEllipse.StrokeThickness / 2;
MagnifierTip.CenterTransform.Y = MagnifierTip.MagnifierEllipse.ActualHeight / 2 - MagnifierTip.MagnifierEllipse.StrokeThickness / 2;
}
private void LayoutGrid_OnPointerWheelChanged(object sender, PointerRoutedEventArgs e)
{
if (e.GetCurrentPoint(this.LayoutGrid).Properties.MouseWheelDelta > 0)
{
zoomScale = Math.Max(MinZoomScale, Math.Min(MaxZoomScale, zoomScale * 1.2));
}
else
{
zoomScale = Math.Max(MinZoomScale, Math.Min(MaxZoomScale, zoomScale / 1.2));
}
this.UpdateMagnifier();
}
private void LayoutGrid_Holding(object sender, HoldingRoutedEventArgs e)
{
// MagnifierTip.Visibility = Windows.UI.Xaml.Visibility.Visible;
}
}
}

I think you need to get your MagnifierTransform to the "root" Grid of your Magnifier UserControl.
Also the CenterTransform doesn't seem to be needed in my opinion.
The other last change is in the MainPage, making the User Control aligned to Top/Left so that the TranslateTransforms make sense.
Just as a bonus, I got the updated project here , also with pointer pressed/released events to show/hide the magnifier. Be warned that "Holding" doesn't work with most mouse devices. Source: link
I also added comments on my changes (comments start with DV:).
It's not perfect and there's obviously still a lot for you to implement but hopefully this is what you needed.
For whoever doesn't want to download the project I'll leave the updated code here:
MainPage.xaml
<Page
x:Class="App78.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App78"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid
x:Name="LayoutGrid"
Margin="0,0"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
Holding="LayoutGrid_Holding"
PointerMoved="LayoutGrid_OnPointerMoved"
PointerWheelChanged="LayoutGrid_OnPointerWheelChanged"
PointerPressed="LayoutGrid_OnPointerPressed"
PointerReleased="LayoutGrid_OnPointerReleased">
<Image
x:Name="BigImage"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Stretch="Uniform"
Source="http://blog.al.com/space-news/2009/04/iss015e22574.jpg" />
<local:Magnifier VerticalAlignment="Top" HorizontalAlignment="Left" x:Name="MagnifierTip" Visibility="Collapsed" />
</Grid>
</Page>
MainPage.xaml.cs
using System;
using System.Diagnostics;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Media.Imaging;
namespace App78
{
public sealed partial class MainPage : Page
{
private double zoomScale = 2;
private double pointerX = 0;
private double pointerY = 0;
private const double MinZoomScale = .25;
private const double MaxZoomScale = 32;
public MainPage()
{
this.InitializeComponent();
var bi = (BitmapImage)BigImage.Source;
bi.ImageOpened += bi_ImageOpened;
this.SizeChanged += MainPage_SizeChanged;
}
void MainPage_SizeChanged(object sender, Windows.UI.Xaml.SizeChangedEventArgs e)
{
this.UpdateImageLayout();
}
void bi_ImageOpened(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
this.UpdateImageLayout();
}
private void UpdateImageLayout()
{
var bi = (BitmapImage)BigImage.Source;
if (bi.PixelWidth < this.LayoutGrid.ActualWidth &&
bi.PixelHeight < this.LayoutGrid.ActualHeight)
{
this.BigImage.Stretch = Stretch.None;
}
else
{
this.BigImage.Stretch = Stretch.Uniform;
}
this.UpdateMagnifier();
}
private void LayoutGrid_OnPointerMoved(object sender, PointerRoutedEventArgs e)
{
//DV: If pointer is not in contact we can ignore it
if (!e.Pointer.IsInContact) { return; }
var point = e.GetCurrentPoint(this.LayoutGrid);
this.pointerX = point.Position.X;
this.pointerY = point.Position.Y;
this.UpdateMagnifier();
}
private void UpdateMagnifier()
{
var bi = (BitmapImage)BigImage.Source;
double offsetX = 0;
double offsetY = 0;
double imageScale = 1;
var imageRatio = (double)bi.PixelWidth / bi.PixelHeight;
var gridRatio = this.LayoutGrid.ActualWidth / this.LayoutGrid.ActualHeight;
if (bi.PixelWidth < this.LayoutGrid.ActualWidth &&
bi.PixelHeight < this.LayoutGrid.ActualHeight)
{
offsetX = 0.5 * (this.LayoutGrid.ActualWidth - bi.PixelWidth);
offsetY = 0.5 * (this.LayoutGrid.ActualHeight - bi.PixelHeight);
//imageScale = 1; - remains
}
else if (imageRatio < gridRatio)
{
offsetX = 0.5 * (this.LayoutGrid.ActualWidth - imageRatio * this.LayoutGrid.ActualHeight);
offsetY = 0;
imageScale = BigImage.ActualHeight / bi.PixelHeight;
}
else
{
offsetX = 0;
offsetY = 0.5 * (this.LayoutGrid.ActualHeight - this.LayoutGrid.ActualWidth / imageRatio);
imageScale = BigImage.ActualWidth / bi.PixelWidth;
}
//DV: This is probably not need anymore
//MagnifierTip.MagnifierTransform.X = this.pointerX;
//MagnifierTip.MagnifierTransform.Y = this.pointerY;
MagnifierTip.PositionTransform.X = (-this.pointerX + offsetX) / imageScale;
MagnifierTip.PositionTransform.Y = (-this.pointerY + offsetY) / imageScale;
//DV: I haven't tested the Scaling/Zoom
MagnifierTip.ZoomTransform.ScaleX = imageScale * zoomScale;
MagnifierTip.ZoomTransform.ScaleY = imageScale * zoomScale;
MagnifierTip.CenterTransform.X = MagnifierTip.MagnifierEllipse.ActualWidth / 2 - MagnifierTip.MagnifierEllipse.StrokeThickness / 2;
MagnifierTip.CenterTransform.Y = MagnifierTip.MagnifierEllipse.ActualHeight / 2 - MagnifierTip.MagnifierEllipse.StrokeThickness / 2;
//DV: I added a GlobalGrid Transform which translates every children
MagnifierTip.MagnifierTransformGrid.X = this.pointerX - (MagnifierTip.ActualWidth / 2);
MagnifierTip.MagnifierTransformGrid.Y = this.pointerY - (MagnifierTip.ActualHeight); ;
}
private void LayoutGrid_OnPointerWheelChanged(object sender, PointerRoutedEventArgs e)
{
if (e.GetCurrentPoint(this.LayoutGrid).Properties.MouseWheelDelta > 0)
{
zoomScale = Math.Max(MinZoomScale, Math.Min(MaxZoomScale, zoomScale * 1.2));
}
else
{
zoomScale = Math.Max(MinZoomScale, Math.Min(MaxZoomScale, zoomScale / 1.2));
}
this.UpdateMagnifier();
}
//DV: Holding usually only works with touch https://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.uielement.holding.aspx?f=255&MSPPError=-2147217396
private void LayoutGrid_Holding(object sender, HoldingRoutedEventArgs e)
{
//
}
//DV: pointer pressed supports both mouse and touch but fires immeadiatley. You'll have to figure out a delay strategy or using holding for touch and right click for mouse
private void LayoutGrid_OnPointerPressed(object sender, PointerRoutedEventArgs e)
{
MagnifierTip.Visibility = Windows.UI.Xaml.Visibility.Visible;
}
//DV: pointer released supports both mouse and touch.
private void LayoutGrid_OnPointerReleased(object sender, PointerRoutedEventArgs e)
{
MagnifierTip.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
}
}
}
Magnifier.xaml
<UserControl
x:Class="App78.Magnifier"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App78"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Height="230"
Width="170">
<Grid Height="230" Width="170">
<!-- DV: This is the global transform I added -->
<Grid.RenderTransform>
<TransformGroup>
<TranslateTransform x:Name="MagnifierTransformGrid" x:FieldModifier="public"/>
</TransformGroup>
</Grid.RenderTransform>
<Ellipse Opacity="1" Visibility="Visible" Fill="{ThemeResource ApplicationPageBackgroundThemeBrush}" HorizontalAlignment="Center" VerticalAlignment="Top" IsHitTestVisible="False" Width="135" Height="128" StrokeThickness="3" Margin="0,17,0,0" />
<Ellipse x:Name="MagnifierEllipse" x:FieldModifier="public" Opacity="1" Visibility="Visible" HorizontalAlignment="Left" VerticalAlignment="Top" IsHitTestVisible="False" Width="150" Height="150" Stroke="White" StrokeThickness="3" Margin="11,8,0,0" >
<Ellipse.Fill>
<ImageBrush
ImageSource="http://blog.al.com/space-news/2009/04/iss015e22574.jpg"
Stretch="None"
AlignmentX="Left"
AlignmentY="Top">
<ImageBrush.Transform>
<TransformGroup>
<TranslateTransform x:FieldModifier="public"
x:Name="CenterTransform"/>
<TranslateTransform x:FieldModifier="public"
x:Name="PositionTransform"/>
<ScaleTransform x:FieldModifier="public"
x:Name="ZoomTransform"/>
</TransformGroup>
</ImageBrush.Transform>
</ImageBrush>
</Ellipse.Fill>
</Ellipse>
<Path Data="M25.533,0C15.457,0,7.262,8.199,7.262,18.271c0,9.461,13.676,19.698,17.63,32.338 c0.085,0.273,0.34,0.459,0.626,0.457c0.287-0.004,0.538-0.192,0.619-0.467c3.836-12.951,17.666-22.856,17.667-32.33 C43.803,8.199,35.607,0,25.533,0z M25.533,32.131c-7.9,0-14.328-6.429-14.328-14.328c0-7.9,6.428-14.328,14.328-14.328 c7.898,0,14.327,6.428,14.327,14.328C39.86,25.702,33.431,32.131,25.533,32.131z"
Fill="#FFF4F4F5"
Stretch="Fill"
Stroke="Black"
UseLayoutRounding="False"
Height="227"
Width="171" ></Path>
</Grid>
</UserControl>

Creating and using a new Brush or color using sliders and dependency properties in C#

I'm working on a project which is a basic WPF "Paint" app. I have three options, draw an Ellipse, draw a Line, or draw a 'shape' (a line where closed sections are filled in). These three options are represented with radio buttons. I have up to this part working. Here's an example screenshot:
http://i.stack.imgur.com/naPyI.jpg
Basically what I need to do now is, when the user changes the sliders for R, G, B, and A (opacity / alpha), a small preview area showing the new color should be updated, and that color should be set as the line or fill color, depending on which group of sliders is changed. All of this needs to be done with data binding.
I'm not really sure as to to best approach this problem. Should I have individual values for each slider (RGBA) and pass those values into Color.FromArgb(R,G,B,A)??
EDIT: Here is my code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.ComponentModel;
namespace WpfPaint
{
public partial class MainWindow : Window, INotifyPropertyChanged
{
public bool start = false;
public Ellipse myEllipse;
public Polyline myLine;
public Line myRegLine = new Line();
public double xPos;
public double yPos;
public MainWindow()
{
InitializeComponent();
MyCanvas.Children.Add(myRegLine);
}
private void MyCanvas_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
if (this.ellipse.IsChecked ?? false)
{
if (start)
{
start = !start;
myEllipse = null;
}
else
{
start = true;
myEllipse = new Ellipse();
xPos = e.GetPosition(MyCanvas).X;
yPos = e.GetPosition(MyCanvas).Y;
MyCanvas.Children.Add(myEllipse);
myEllipse.StrokeThickness = 5;
if (comboBox2.Text == "Red")
{
myEllipse.Fill = Brushes.Red;
fillR.Value = 255;
fillG.Value = 0;
fillB.Value = 0;
}
else if (comboBox2.Text == "Green")
{
myEllipse.Fill = Brushes.Green;
fillR.Value = 0;
fillG.Value = 255;
fillB.Value = 0;
}
else if (comboBox2.Text == "Blue")
{
myEllipse.Fill = Brushes.Blue;
fillR.Value = 0;
fillG.Value = 0;
fillB.Value = 255;
}
if (comboBox1.Text == "Red")
{
myEllipse.Stroke = Brushes.Red;
lineR.Value = 255;
lineG.Value = 0;
lineB.Value = 0;
}
else if (comboBox1.Text == "Green")
{
myEllipse.Stroke = Brushes.Green;
lineR.Value = 0;
lineG.Value = 255;
lineB.Value = 0;
}
else if (comboBox1.Text == "Blue")
{
myEllipse.Stroke = Brushes.Blue;
lineR.Value = 0;
lineG.Value = 0;
lineB.Value = 255;
}
}
}
else
{
switch (e.ClickCount)
{
case 1:
if (myLine == null)
{
myLine = new Polyline();
MyCanvas.Children.Add(myLine);
myLine.StrokeThickness = 5;
if (comboBox1.Text == "Red")
{
myLine.Stroke = Brushes.Red;
lineR.Value = 255;
lineG.Value = 0;
lineB.Value = 0;
}
else if (comboBox1.Text == "Green")
{
myLine.Stroke = Brushes.Green;
lineR.Value = 0;
lineG.Value = 255;
lineB.Value = 0;
}
else if (comboBox1.Text == "Blue")
{
myLine.Stroke = Brushes.Blue;
lineR.Value = 0;
lineG.Value = 0;
lineB.Value = 255;
}
if (this.shape.IsChecked ?? false)
{
if (comboBox2.Text == "Red")
{
myLine.Fill = Brushes.Red;
fillR.Value = 255;
fillG.Value = 0;
fillB.Value = 0;
}
else if (comboBox2.Text == "Green")
{
myLine.Fill = Brushes.Green;
fillR.Value = 0;
fillG.Value = 255;
fillB.Value = 0;
}
else if (comboBox2.Text == "Blue")
{
myLine.Fill = Brushes.Blue;
fillR.Value = 0;
fillG.Value = 0;
fillB.Value = 255;
}
}
}
myLine.Points.Add(e.GetPosition(MyCanvas));
e.Handled = true;
break;
case 2:
myLine = null;
myRegLine = new Line();
MyCanvas.Children.Add(myRegLine);
break;
}
}
}
private void MyCanvas_PreviewMouseMove(object sender, MouseEventArgs e)
{
if (start)
{
myEllipse.Height = Math.Abs(e.GetPosition(MyCanvas).X - xPos) * 2;
myEllipse.Width = Math.Abs(e.GetPosition(MyCanvas).X - xPos) * 2;
Canvas.SetTop(myEllipse, ((yPos) - myEllipse.Height / 2));
Canvas.SetLeft(myEllipse, ((xPos) - myEllipse.Width / 2));
}
else
{
if (myLine != null)
{
myRegLine.Stroke = myLine.Stroke;
myRegLine.X1 = myLine.Points.Last().X;
myRegLine.Y1 = myLine.Points.Last().Y;
myRegLine.X2 = e.GetPosition(MyCanvas).X;
myRegLine.Y2 = e.GetPosition(MyCanvas).Y;
}
}
}
private void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
}
private void comboBox2_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
}
}
}
and here is my XAML
<Window x:Class="WpfPaint.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<RadioButton Content="Line" Height="16" HorizontalAlignment="Left" Margin="12,10,0,0" Name="line" GroupName="options" VerticalAlignment="Top" IsChecked="True" />
<RadioButton Content="Shape" Height="16" HorizontalAlignment="Left" Margin="12,34,0,0" Name="shape" GroupName="options" VerticalAlignment="Top" />
<RadioButton Content="Ellipse" Height="16" HorizontalAlignment="Left" Margin="12,56,0,0" Name="ellipse" GroupName="options" VerticalAlignment="Top" />
<Label Content="R" Margin="210,5,270,0" Height="31" VerticalAlignment="Top" />
<Slider Height="23" HorizontalAlignment="Left" Margin="229,5,0,0" Name="lineR" VerticalAlignment="Top" Width="50" IsMoveToPointEnabled="False" Interval="1" IsSelectionRangeEnabled="False" Maximum="255" />
<Slider Height="23" Margin="306,5,147,0" Name="lineG" VerticalAlignment="Top" IsMoveToPointEnabled="False" Interval="1" Maximum="255" />
<Label Content="G" Margin="282,3,203,0" Height="30" VerticalAlignment="Top" />
<Slider Height="23" HorizontalAlignment="Left" Margin="380,5,0,0" Name="lineB" VerticalAlignment="Top" Width="50" Interval="1" Maximum="255" />
<Label Content="B" Margin="358,3,129,280"/>
<Slider Height="23" HorizontalAlignment="Left" Margin="453,5,0,0" Name="lineA" VerticalAlignment="Top" Width="50" Interval="1" Maximum="255" Value="255" />
<Label Content="A" Margin="428,3,56,0" Height="28" VerticalAlignment="Top" />
<Canvas Name="MyCanvas" Background="#FFDADADA" Margin="0,76,0,0" PreviewMouseDown="MyCanvas_PreviewMouseDown" PreviewMouseMove="MyCanvas_PreviewMouseMove"></Canvas>
<ComboBox Height="23" HorizontalAlignment="Left" Margin="127,5,0,0" Name="comboBox1" VerticalAlignment="Top" Width="70" SelectionChanged="comboBox1_SelectionChanged">
<ComboBoxItem Content="Red" IsSelected="True" />
<ComboBoxItem Content="Green" />
<ComboBoxItem Content="Blue" />
</ComboBox>
<Label Content="Line" Height="28" HorizontalAlignment="Left" Margin="89,3,0,0" Name="label1" VerticalAlignment="Top" />
<Label Content="Fill" Height="28" HorizontalAlignment="Left" Margin="96,42,0,0" Name="label2" VerticalAlignment="Top" />
<ComboBox Height="23" HorizontalAlignment="Left" Margin="127,44,0,0" Name="comboBox2" VerticalAlignment="Top" Width="70" SelectionChanged="comboBox2_SelectionChanged">
<ComboBoxItem Content="Red" IsSelected="True" />
<ComboBoxItem Content="Green" />
<ComboBoxItem Content="Blue" />
</ComboBox>
<Label Content="R" Margin="210,42,270,238" />
<Slider Height="23" HorizontalAlignment="Left" IsMoveToPointEnabled="False" Margin="229,44,0,0" Name="fillR" VerticalAlignment="Top" Width="50" Maximum="255" Interval="1" />
<Slider Height="23" HorizontalAlignment="Left" IsMoveToPointEnabled="False" Margin="306,44,0,0" Name="fillG" VerticalAlignment="Top" Width="50" Maximum="255" Interval="1" />
<Label Content="G" Margin="282,40,203,241" />
<Slider Height="23" HorizontalAlignment="Left" Margin="380,44,0,0" Name="fillB" VerticalAlignment="Top" Width="50" Maximum="255" Interval="1" />
<Label Content="B" Margin="358,42,0,241" HorizontalAlignment="Left" Width="16" />
<Slider Height="23" HorizontalAlignment="Left" Margin="453,44,0,0" Name="fillA" VerticalAlignment="Top" Width="50" Value="255" Interval="1" Maximum="255" />
<Label Content="A" Margin="428,42,56,241" />
</Grid>

Not sure if this is the best way to do it but you can have 5 public properties in your viewmodel:
one for Alpha, one for Red, one for Green, one for Blue, and one user defined structure that you will use to "group" the 4 values together (let's call it FillValue). Bind your 4 sliders to Alpha, Red, Green, and Blue. in the setters for those 4 properties, you set the corresponding field in FillValue then call NotifyPropertyChanged for both properties. Something like this:
public double Red
{
get { return FillValue.Red; }
set
{
FillValue.Red = value;
NotifyPropertyChanged("Red");
NotifyPropertyChanged("FillValue");
}
}
Then bind your preview's fill property to FillValue and add a converter to convert the FillValue to a brush. The binding will look something like this:
<StackPanel>
<StackPanel.Resources>
<RGBExample:FillValueCvtr x:Key="ColorCvtr"/>
</StackPanel.Resources>
<Rectangle Fill="{Binding FillValue, Converter={StaticResource ColorCvtr}}"/>
</StackPanel>

Setting an XAML Window always on top (but no TopMost property)

I am developing an application based on OptiTrack SDK (from NaturalPoint). I need to run the application window as "Always on Top". The window is designed in XAML and is controled in the class "CameraView" but it does not seem to include a "TopMost" property or equivalent. Attached are the code of "CameraView.xaml.cs" and the code of "CameraView.xaml" that are part of OptiTrack SDK (NaturalPoint) called "Single_Camera_CSharp_.NET_3.0".
One could expect the class CameraView to contain properties or members to set the position of the window on the screen or to set it to TopMost but as far as searched I found nothing. I wonder what I should do.
Thank you,
Brian
================
"CameraView.xaml.cs"
using System;
using System.IO;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Windows.Threading;
namespace TestProject
{
public partial class CameraView
{
private const int NP_OPTION_OBJECT_COLOR_OPTION = 3;
private const int NP_OPTION_VIDEO_TYPE = 48;
private const int NP_OPTION_NUMERIC_DISPLAY_ON = 71;
private const int NP_OPTION_NUMERIC_DISPLAY_OFF = 72;
private const int NP_OPTION_FETCH_RLE = 73;
private const int NP_OPTION_FETCH_GRAYSCALE = 74;
private const int NP_OPTION_FRAME_DECIMATION = 52;
private const int NP_OPTION_INTENSITY = 50;
private const int NP_OPTION_SEND_EMPTY_FRAMES = 41;
private const int NP_OPTION_THRESHOLD = 5;
private const int NP_OPTION_EXPOSURE = 46;
private const int NP_OPTION_SEND_FRAME_MASK = 73;
private const int NP_OPTION_TEXT_OVERLAY_OPTION = 74;
// public delegate void OnCameraViewCreate(CameraView camera);
// public static OnCameraViewCreate onCameraViewCreate;
private System.Drawing.Bitmap raw = new System.Drawing.Bitmap(353, 288, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
private int mFrameCounter;
private int mDisplayCounter;
private DispatcherTimer timer1 = new DispatcherTimer();
private bool mVideoFrameAvailable = false;
private int mNumeric = -1;
private bool mGreyscale = false;
private bool mOverlay = true;
public CameraView()
{
this.InitializeComponent();
timer1.Interval = new TimeSpan(0, 0, 0, 0, 10);
timer1.Tick += new EventHandler(timer1_Tick);
}
public int Numeric
{
get { return mNumeric; }
set
{
mNumeric = value % 100;
if (mNumeric >= 0)
{
if (Camera != null)
Camera.SetOption(NP_OPTION_NUMERIC_DISPLAY_ON, value % 100);
}
}
}
private bool CameraRunning = false;
private OptiTrack.NPCamera mCamera;
public OptiTrack.NPCamera Camera
{
get { return mCamera; }
set
{
if (mCamera == value) return; //== Don't do anything if you're assigning the same camera ==
if (mCamera != null)
{
//== Shut the selected camera down ==<<
if (CameraRunning)
{
CameraRunning = false;
mCamera.Stop();
mCamera.FrameAvailable -= FrameAvailable;
}
}
mCamera = value;
if (mCamera == null)
{
mNumeric = -1;
}
else
{
serialLabel.Content = "Camera "+mCamera.SerialNumber.ToString(); //mNumeric.ToString();
}
}
}
private void FrameAvailable(OptiTrack.NPCamera Camera)
{
mFrameCounter++;
try
{
OptiTrack.NPCameraFrame frame = Camera.GetFrame(0);
int id = frame.Id;
if (CameraRunning)
{
GetFrameData(Camera, frame);
}
frame.Free();
}
catch (Exception)
{
int r = 0;
r++;
}
}
private void GetFrameData(OptiTrack.NPCamera camera, OptiTrack.NPCameraFrame frame)
{
BitmapData bmData = raw.LockBits(new System.Drawing.Rectangle(0, 0, raw.Width, raw.Height),
ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
int stride = bmData.Stride;
System.IntPtr bufferPtr = bmData.Scan0;
unsafe
{
byte* buffer = (byte*)(void*)bufferPtr;
camera.GetFrameImage(frame, bmData.Width, bmData.Height, bmData.Stride, 32, ref buffer[0]);
}
raw.UnlockBits(bmData);
mVideoFrameAvailable = true;
}
private void timer1_Tick(object sender, EventArgs e)
{
if (CameraRunning && mVideoFrameAvailable)
{
mVideoFrameAvailable = false;
cameraImage.Source = Img(raw);
mDisplayCounter++;
}
}
private System.Windows.Media.ImageSource Img(System.Drawing.Bitmap img)
{
System.Drawing.Imaging.BitmapData bmData = img.LockBits(new System.Drawing.Rectangle(0, 0, img.Width, img.Height),
System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
System.Windows.Media.Imaging.BitmapSource bitmap = System.Windows.Media.Imaging.BitmapSource.Create(
img.Width, img.Height, 96, 96, PixelFormats.Bgra32,
System.Windows.Media.Imaging.BitmapPalettes.WebPalette,
bmData.Scan0, bmData.Stride * bmData.Height, bmData.Stride);
img.UnlockBits(bmData);
return bitmap;
}
private void startStopButton_Click(object sender, RoutedEventArgs e)
{
if (CameraRunning)
StopCamera();
else
StartCamera();
}
public void StartCamera()
{
if (Camera != null)
{
mFrameCounter = 0;
mDisplayCounter = 0;
Camera.FrameAvailable += FrameAvailable;
Camera.SetOption(NP_OPTION_VIDEO_TYPE, 0);
Camera.SetOption(NP_OPTION_FRAME_DECIMATION, 1);
Camera.SetOption(NP_OPTION_INTENSITY, 0);
Camera.SetOption(NP_OPTION_EXPOSURE, 10);
Camera.SetOption(NP_OPTION_THRESHOLD, 50);
Camera.SetOption(NP_OPTION_OBJECT_COLOR_OPTION, 0);
SetOverlayOption();
SetGreyscaleOption();
timer1.Start();
Camera.Start();
CameraRunning = true;
this.Numeric = mNumeric;
startStopButton.Content = "Stop Camera";
}
}
private void SetGreyscaleOption()
{
if(mGreyscale)
Camera.SetOption(NP_OPTION_VIDEO_TYPE, 1);
else
Camera.SetOption(NP_OPTION_VIDEO_TYPE, 0);
}
private void SetOverlayOption()
{
if(mOverlay)
Camera.SetOption(NP_OPTION_TEXT_OVERLAY_OPTION, 255);
else
Camera.SetOption(NP_OPTION_TEXT_OVERLAY_OPTION, 0);
}
public void StopCamera()
{
if (Camera != null)
{
Camera.Stop();
timer1.Stop();
CameraRunning = false;
Camera.FrameAvailable -= FrameAvailable;
Camera.SetOption(NP_OPTION_NUMERIC_DISPLAY_OFF, 0);
startStopButton.Content = "Start Camera";
}
}
private void greyscaleButton_Click(object sender, RoutedEventArgs e)
{
if(mGreyscale)
mGreyscale = false;
else
mGreyscale = true;
SetGreyscaleOption();
}
private void OverlayButton_Click(object sender, RoutedEventArgs e)
{
if(mOverlay)
mOverlay = false;
else
mOverlay = true;
SetOverlayOption();
}
private void exposureSlider_ValueChanged(object sender, RoutedEventArgs e)
{
if (mCamera!=null)
{
mCamera.SetOption(NP_OPTION_EXPOSURE, (int) this.exposureSlider.Value);
}
}
private void thresholdSlider_ValueChanged(object sender, RoutedEventArgs e)
{
if (mCamera != null)
{
mCamera.SetOption(NP_OPTION_THRESHOLD, (int)this.thresholdSlider.Value);
}
}
private void optionsButton_Click(object sender, RoutedEventArgs e)
{
if (!propertyPanel.IsVisible)
propertyPanel.Visibility = Visibility.Visible;
else
propertyPanel.Visibility = Visibility.Collapsed;
}
}
}
================
"CameraView.xaml"
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="TestProject.CameraView"
x:Name="CameraView1"
Width="Auto" Height="Auto"
xmlns:d="http://schemas.microsoft.com/expression/blend/2006"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
>
<Grid x:Name="LayoutRoot" Width="Auto" Height="Auto">
<Grid.Background>
<x:Null/>
</Grid.Background>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="113.904"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="26.667"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid Margin="0,0,0,0" Grid.ColumnSpan="2">
<Rectangle RadiusX="1.25" RadiusY="1.25" Margin="0,0,0,0" VerticalAlignment="Stretch">
<Rectangle.Fill>
<LinearGradientBrush EndPoint="0.492,0.149" StartPoint="0.492,0.843">
<GradientStop Color="#FF000000" Offset="0"/>
<GradientStop Color="#FF23283F" Offset="1"/>
</LinearGradientBrush>
</Rectangle.Fill>
<Rectangle.Stroke>
<LinearGradientBrush EndPoint="0.291,-4.231" StartPoint="1.668,18.025">
<GradientStop Color="#FF000000" Offset="0"/>
<GradientStop Color="#FFFFFFFF" Offset="1"/>
</LinearGradientBrush>
</Rectangle.Stroke>
</Rectangle>
<Rectangle RadiusX="3.333" RadiusY="3.333" Opacity="0.13" Margin="0,0,0,13">
<Rectangle.Fill>
<SolidColorBrush Color="#FFFFFFFF"/>
</Rectangle.Fill>
<Rectangle.Stroke>
<x:Null/>
</Rectangle.Stroke>
</Rectangle>
</Grid>
<Image Margin="0,0,0,0" x:Name="cameraImage" Grid.ColumnSpan="2" Grid.Row="1"/>
<Label x:Name="serialLabel" FontSize="10" FontWeight="Bold" Foreground="#FFDEDADA" Content="Camera 10024" HorizontalAlignment="Right" Margin="0,0,4,0" VerticalAlignment="Top" Grid.Column="1">
<Label.BitmapEffect>
<OuterGlowBitmapEffect GlowColor="#FF000000" GlowSize="4" Opacity="0.7"/>
</Label.BitmapEffect>
</Label>
<WrapPanel Margin="3,3,3,3">
<Button HorizontalAlignment="Stretch" Margin="0,0,0,0" x:Name="startStopButton" Width="100" Height="Auto" BorderThickness="0,0,0,0" Content="Start Camera" Click="startStopButton_Click"/>
<Button x:Name="optionsButton" Width="61.474" Height="Auto" BorderThickness="0,0,0,0" Content="Options" Click="optionsButton_Click"/>
</WrapPanel>
<Grid Visibility="Visible" d:LayoutOverrides="HorizontalAlignment, VerticalAlignment" HorizontalAlignment="Right" Margin="0,0,16,16" x:Name="propertyPanel" VerticalAlignment="Bottom" Width="169.237" Height="81.455" Grid.ColumnSpan="2" Grid.Row="1">
<Rectangle Stroke="#FFFFFFFF" StrokeThickness="3" Margin="0,0,0,0">
<Rectangle.BitmapEffect>
<DropShadowBitmapEffect/>
</Rectangle.BitmapEffect>
<Rectangle.Fill>
<LinearGradientBrush EndPoint="1,0.5" StartPoint="0,0.5">
<GradientStop Color="#FF1E212F" Offset="0"/>
<GradientStop Color="#FF313551" Offset="1"/>
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Slider HorizontalAlignment="Stretch" Margin="62.633,5,4.681,0" x:Name="exposureSlider" VerticalAlignment="Top" Width="Auto" Height="Auto" Orientation="Horizontal" Maximum="255" ValueChanged="exposureSlider_ValueChanged"/>
<Label x:Name="serialLabel_Copy" FontSize="10" FontWeight="Bold" Foreground="#FFDEDADA" Content="Exposure" HorizontalAlignment="Left" Margin="3.853,3.853,0,0" VerticalAlignment="Top" Width="57.352">
<Label.BitmapEffect>
<OuterGlowBitmapEffect GlowColor="#FF000000" GlowSize="4" Opacity="0.7"/>
</Label.BitmapEffect>
</Label>
<Label x:Name="serialLabel_Copy1" FontSize="10" FontWeight="Bold" Foreground="#FFDEDADA" Content="Threshold" d:LayoutOverrides="Height" HorizontalAlignment="Left" Margin="3.853,27.691,0,0" VerticalAlignment="Top" Width="59.829">
<Label.BitmapEffect>
<OuterGlowBitmapEffect GlowColor="#FF000000" GlowSize="4" Opacity="0.7"/>
</Label.BitmapEffect>
</Label>
<Slider x:Name="thresholdSlider" Width="Auto" Orientation="Horizontal" Maximum="253" d:LayoutOverrides="Height, Margin" Margin="62.633,27.691,4.681,0" VerticalAlignment="Top" Minimum="54" Value="54" ValueChanged="thresholdSlider_ValueChanged"/>
<Button x:Name="greyScaleButton" Width="75.333" Content="Greyscale" Click="greyscaleButton_Click" HorizontalAlignment="Left" Height="21" d:LayoutOverrides="Height" Margin="8,53.761,0,0" VerticalAlignment="Top"/>
<Button x:Name="Overlay" Height="21" Content="Overlay" Click="OverlayButton_Click" d:LayoutOverrides="Height" HorizontalAlignment="Right" Margin="0,53.761,8,0" VerticalAlignment="Top" Width="64"/>
</Grid>
</Grid>
</UserControl>

The Topmost property exists on the Window class: http://msdn.microsoft.com/en-us/library/system.windows.window.topmost.aspx.
Your CameraView class is derived from UserControl, which is a kind of control that sits inside a Window (or other container such as a Page, but that's not important here). UserControl doesn't have a Topmost property because it doesn't appear independently on the desktop.
Host your CameraView in a Window and set the Window.Topmost:
<!-- MyWindow.xaml -->
<Window ...
xmlns:local="clr-namespace:TestProject"
Topmost="True">
<local:CameraView />
</Window>
where the ellipses represent the default gunk like x:Class and WPF xmlns declarations that Visual Studio creates for you.

In the UserControl code behind, you can get a reference to the window that is hosting it, then set the Topmost property. Example,
Window parent = Window.GetWindow(this);
parent.Topmost = true;

This is UserControl. You can set TopMost property for Windows only