解决Canvas无法缩放，配合Viewbox限定Canvas大小来完成缩放

src/components/SensorChart.xaml

@@ -3,7 +3,7 @@
              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" 
-             mc:Ignorable="d" d:DesignWidth="200" Height="482">
+             mc:Ignorable="d" d:DesignWidth="200" >
         <Border Background="White" BorderBrush="#CCCCCC" BorderThickness="1">
             <Grid Margin="0,0,0,-1">
                 <Grid.RowDefinitions>
@@ -20,7 +20,9 @@
                           Background="{Binding HeaderBackground, RelativeSource={RelativeSource AncestorType=UserControl}}"/>
 
                 <!-- 图表区域 -->
-            <Canvas Grid.Row="1" Background="White" Margin="20,20,20,3" Name="ChartCanvas">
+            <Viewbox Grid.Row="1" Stretch="Uniform">
+
+                <Canvas Width="160" Height="440"  Grid.Row="1" Background="White" Margin="20,20,20,3" Name="ChartCanvas">
                     <!-- 柱状图容器边框 - 左边界线 -->
                     <Line X1="40" Y1="20" X2="40" Y2="420" Stroke="Black" StrokeThickness="1"/>
                     <!-- 右边界线 -->
@@ -209,6 +211,7 @@
                         </ItemsControl.ItemContainerStyle>
                     </ItemsControl>
                 </Canvas>
+            </Viewbox>
         </Grid>
         </Border>
 </UserControl>