WriteableBitmapを使用してキャンバスに描画すると、C＃WPF

Question

あなたが私を助けてくれることを願っています。 WriteableBitmapクラスを使用してキャンバス上のポイントを描画しようとしていますが、実行時に何も表示されません。同様の問題を見たことがありますが、何も動作していないようです。ここに私のコードです。

<Window x:Class="DASP_WorkstationWPF.MainWindow" 
    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:DASP_WorkstationWPF" 
    mc:Ignorable="d" 
    Title="" Height="900" Width="1440" Background="PaleGoldenrod" > 

<Canvas> 
    <Canvas.Background> 
     <SolidColorBrush Color="Black" Opacity="0"/> 
    </Canvas.Background> 

    <Label x:Name="labela" Content="Amplitude" Canvas.Left="70" Canvas.Top="60"/> 
    <Label x:Name="labelf" Content="Frequency" Canvas.Left="70" Canvas.Top="90"/> 
    <Label x:Name="labelp" Content="Phase" Canvas.Left="70" Canvas.Top="120"/> 

    <Label x:Name="label0" Content="Sine Wave 1" Canvas.Left="170" Canvas.Top="36"/> 
    <TextBox x:Name="amplitude0" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="160" Canvas.Top="64" /> 
    <TextBox x:Name="frequency0" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="160" Canvas.Top="94" /> 
    <TextBox x:Name="phase0" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="160" Canvas.Top="124" /> 

    <Label x:Name="label1" Content="Sine Wave 2" Canvas.Left="290" Canvas.Top="36"/> 
    <TextBox x:Name="amplitude1" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="280" Canvas.Top="64" /> 
    <TextBox x:Name="frequency1" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="280" Canvas.Top="94" /> 
    <TextBox x:Name="phase1" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="280" Canvas.Top="124" /> 

    <Label x:Name="label2" Content="Sine Wave 3" Canvas.Left="410" Canvas.Top="36"/> 
    <TextBox x:Name="amplitude2" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="400" Canvas.Top="64" /> 
    <TextBox x:Name="frequency2" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="400" Canvas.Top="94" /> 
    <TextBox x:Name="phase2" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="400" Canvas.Top="124" /> 

    <Label x:Name="label3" Content="Sine Wave 4" Canvas.Left="530" Canvas.Top="36"/> 
    <TextBox x:Name="amplitude3" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="520" Canvas.Top="64" /> 
    <TextBox x:Name="frequency3" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="520" Canvas.Top="94" /> 
    <TextBox x:Name="phase3" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="520" Canvas.Top="124" /> 

    <Label x:Name="label4" Content="Sine Wave 5" Canvas.Left="650" Canvas.Top="36"/> 
    <TextBox x:Name="amplitude4" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="640" Canvas.Top="64" /> 
    <TextBox x:Name="frequency4" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="640" Canvas.Top="94" /> 
    <TextBox x:Name="phase4" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="640" Canvas.Top="124" /> 

    <Label x:Name="label5" Content="Sine Wave 6" Canvas.Left="770" Canvas.Top="36"/> 
    <TextBox x:Name="amplitude5" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="760" Canvas.Top="64" /> 
    <TextBox x:Name="frequency5" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="760" Canvas.Top="94" /> 
    <TextBox x:Name="phase5" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="760" Canvas.Top="124" /> 

    <Label x:Name="label6" Content="Sine Wave 7" Canvas.Left="890" Canvas.Top="36"/> 
    <TextBox x:Name="amplitude6" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="880" Canvas.Top="64" /> 
    <TextBox x:Name="frequency6" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="880" Canvas.Top="94" /> 
    <TextBox x:Name="phase6" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="880" Canvas.Top="124" /> 


    <Label x:Name="label7" Content="Sine Wave 8" Canvas.Left="1010" Canvas.Top="36"/> 
    <TextBox x:Name="amplitude7" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="1000" Canvas.Top="64" /> 
    <TextBox x:Name="frequency7" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="1000" Canvas.Top="94" /> 
    <TextBox x:Name="phase7" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="1000" Canvas.Top="124" /> 

    <Label x:Name="label8" Content="Sine Wave 9" Canvas.Left="1130" Canvas.Top="36"/> 
    <TextBox x:Name="amplitude8" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="1120" Canvas.Top="64" /> 
    <TextBox x:Name="frequency8" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="1120" Canvas.Top="94" /> 
    <TextBox x:Name="phase8" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="1120" Canvas.Top="124" /> 

    <Label x:Name="label9" Content="Sine Wave 10" Canvas.Left="1250" Canvas.Top="36"/> 
    <TextBox x:Name="amplitude9" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="1240" Canvas.Top="64" /> 
    <TextBox x:Name="frequency9" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="1240" Canvas.Top="94" /> 
    <TextBox x:Name="phase9" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="1240" Canvas.Top="124" /> 

    <Button x:Name="plot" Content="Plot Signal" Canvas.Left="160" Canvas.Top="185" Width="134" Height="26" Click="plot_Click"/> 
    <Button x:Name="save" Content="Save Preset" Canvas.Left="330" Canvas.Top="185" Width="134" Height="26"/> 
    <Label x:Name="label10" Content="Preset Signals" Canvas.Left="600" Canvas.Top="185"/> 
    <ComboBox x:Name="defaults" Canvas.Left="699" Canvas.Top="185" Width="188" Height="26"/> 
    <Label x:Name="label11" Content="Sampling Rate" Canvas.Left="1050" Canvas.Top="185"/> 
    <ComboBox x:Name="samplingRate" SelectedIndex="1" Canvas.Left="1152" Canvas.Top="185" Width="188" Height="26" SelectionChanged="samplingRate_SelectionChanged"> 
     <ComboBoxItem Content="44.1kHz" HorizontalAlignment="Left" Width="186"/> 
     <ComboBoxItem Content="48kHz" HorizontalAlignment="Left" Width="186"/> 
     <ComboBoxItem Content="96kHz" HorizontalAlignment="Left" Width="186"/> 
     <ComboBoxItem Content="192kHz" HorizontalAlignment="Left" Width="186"/> 
    </ComboBox> 

    <Rectangle Fill="#F0F8FF" Height="200" Canvas.Left="70" Stroke="Black" Canvas.Top="240" Width="1270"/> 


    <Rectangle Fill="#F0F8FF" Height="200" Canvas.Left="70" Stroke="Black" Canvas.Top="600" Width="1270"/> 
</Canvas> 

...とC＃の目的球。

void plotSignal() 
    { 
     WriteableBitmap writeableBmp = BitmapFactory.New(240, 1270); 
     using (writeableBmp.GetBitmapContext()) 
     { 
      //writeableBmp.SetPixel(10, 13, Colors.Black); 
      writeableBmp.DrawLine(1, 2, 200, 400, Colors.Black); 
     } 
    } 

私は私のキャンバス上の任意の場所に描画するために何かを得ることができない現時点ではしかし、XAMLの下部にある長方形にwriteableBmp.SetPixelの信号をプロットうという考え方。あなたが念頭に置いていたが、それが正しい方向に私を指摘し、おそらくない、まさに事前

Answer 1

おかげクレメンス

おかげで、 - キャンバス

<Canvas Name="mainCanvas"> 

に名前を追加し、機能を編集しました。.. 。

void plotSignal() 
    { 
     // http://writeablebitmapex.codeplex.com/ 
     WriteableBitmap writeableBmp = BitmapFactory.New(240, 1270); 
     using (writeableBmp.GetBitmapContext()) 
     { 
      //writeableBmp.SetPixel(10, 13, Colors.Black); 
      writeableBmp.DrawLine(1, 2, 200, 400, Colors.Black); 
      Image waveform = new Image(); 
      waveform.Source = writeableBmp; 
      mainCanvas.Children.Add(waveform); 
     } 
    } 

結果は「