C# 使用ScaleTransform缩放画布时,ScrollViewer不显示所有内容
我在ScrollViewer中有两个画布面板。一种是主画布,在其背景上绘制网格形状。然后我有两项控件。第一个ItemsControl将Stackpanel作为水平方向的ItemsPanel。第二个ItemsControl的面板是Canvas。在此画布上,我正在Itemscontrol的DataTemplate中绘制线条对象。此画布上有PreviewMouseWheel事件。在事件处理程序中,我正在缩放这个画布,它正在缩放线条对象。此画布的宽度绑定到ViewModel属性CanvasWidth。此外,这将更改外部画布的宽度,因为其宽度也绑定到ViewModel属性CanvasWidth。当PreviewMouseWheel启动时,我将在主画布上添加更多网格线。我将TextBlock作为ItemsSource的数据模板覆盖在它们上面。在缩放之前,最后一个文本块的内容是14260。缩放后应保持14260。但两个连续文本块的步长值应减小。现在我无法通过ScrollViewer查看全部内容。减小了所需的步长,但无法通过Scrollviewer看到绘制的新网格线。我知道有内容。但我无法访问它。scrollviewer没有显示它C# 使用ScaleTransform缩放画布时,ScrollViewer不显示所有内容,c#,wpf,canvas,scrollviewer,scaletransform,C#,Wpf,Canvas,Scrollviewer,Scaletransform,我在ScrollViewer中有两个画布面板。一种是主画布,在其背景上绘制网格形状。然后我有两项控件。第一个ItemsControl将Stackpanel作为水平方向的ItemsPanel。第二个ItemsControl的面板是Canvas。在此画布上,我正在Itemscontrol的DataTemplate中绘制线条对象。此画布上有PreviewMouseWheel事件。在事件处理程序中,我正在缩放这个画布,它正在缩放线条对象。此画布的宽度绑定到ViewModel属性CanvasWidth。此
<Grid x:Name="grid1" >
<Grid.RowDefinitions>
<RowDefinition Height="20" />
<RowDefinition Height="*" />
<RowDefinition Height="20" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="20"/>
</Grid.ColumnDefinitions>
<ScrollViewer Name="scrollViewer" HorizontalScrollBarVisibility="Auto" Grid.Row="1" Grid.Column="3" Margin="10,10,0,10" >
<Canvas Name="back_canvas" Height="12000" Width="{Binding CanvasWidth}" Margin="0,0,10,0" >
<Canvas.Background>
<DrawingBrush TileMode="Tile" Viewport="0,0,40,40" ViewportUnits="Absolute">
<DrawingBrush.Drawing>
<GeometryDrawing>
<GeometryDrawing.Geometry>
<RectangleGeometry Rect="0,0,50,50"/>
</GeometryDrawing.Geometry>
<GeometryDrawing.Pen>
<Pen Brush="Gray" Thickness="1"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingBrush.Drawing>
</DrawingBrush>
</Canvas.Background>
<ItemsControl ItemsSource="{Binding TimeAxis}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}" Margin="0,0,3,0" Width="37" Background="GreenYellow" >
</TextBlock>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<ItemsControl ItemsSource="{Binding Lines}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Canvas Height="12000" Background="Transparent" Name="front_canvas"
PreviewMouseWheel="OnPreviewMouseWheel"
Width="{Binding CanvasWidth, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
</Line>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Canvas>
</ScrollViewer>
</Grid>
private void UpdateGraph(Canvas canvas, double deltaValue)
{
List<MarkerView> markers = new List<MarkerView>();
scaleFactor += deltaValue;
double tempScale = scaleFactor;
if (scaleFactor < 1.0)
{
scaleFactor = 1.0;
}
if (scaleFactor > maximumScale)
{
scaleFactor = maximumScale;
}
if (tempScale > 0)
{
totalSamples = graphVM.maxSignalLength;
maximumCanvasWidth = totalSamples * maximumDeltaDistance;
if(scaleFactor<=maximumDeltaDistance)
{
ScaleTransform scaleTransform = new ScaleTransform(scaleFactor, 1);
canvas.RenderTransform = scaleTransform;
verticalLines.ForEach(x =>
{
x.RenderTransformOrigin = new Point(1, 1);
x.RenderTransform = new ScaleTransform(1 / scaleTransform.ScaleX, 1 / scaleTransform.ScaleY);
});
if (deltaValue < 0)
{
graphVM.CanvasWidth = graphVM.InitialCanvasWidth * tempScale;
}
else
{
if (graphVM.InitialCanvasWidth * scaleFactor > maximumCanvasWidth)
graphVM.CanvasWidth = maximumCanvasWidth;
else
graphVM.CanvasWidth = graphVM.InitialCanvasWidth * scaleFactor;
}
graphVM.ResetLabels();
DeltaDistance = canvas.Width / totalSamples;
MarkerView markerRed =
UIHelperView.FindChild<MarkerView>(Application.Current.MainWindow, "splitterRed");
MarkerView markerGreen =
UIHelperView.FindChild<MarkerView>(Application.Current.MainWindow, "splitterGreen");
markers.Add(markerRed);
markers.Add(markerGreen);
// Move Markers with zooming
foreach (MarkerView marker in markers)
{
marker.Delta = DeltaDistance; // after zooming if you move the marker then this value will be used to get correct position
Canvas.SetLeft(marker, marker.XPosition * DeltaDistance);
}
markers.Clear();
}
}
}
私有void UpdateGraph(画布,双deltaValue)
{
列表标记=新列表();
scaleFactor+=增量值;
双tempScale=scaleFactor;
如果(比例因子<1.0)
{
scaleFactor=1.0;
}
如果(比例因子>最大比例)
{
scaleFactor=最大刻度;
}
如果(温度刻度>0)
{
totalSamples=graphVM.maxSignalLength;
maximumCanvasWidth=总样本数*最大三角距离;
if(scaleFactor)
{
x、 RenderTransferMorigin=新点(1,1);
x、 RenderTransform=新的ScaleTransform(1/ScaleTransform.ScaleX,1/ScaleTransform.ScaleY);
});
如果(deltaValue<0)
{
graphVM.CanvasWidth=graphVM.InitialCanvasWidth*tempScale;
}
其他的
{
if(graphVM.InitialCanvasWidth*scaleFactor>maximumCanvasWidth)
graphVM.CanvasWidth=最大CanvasWidth;
其他的
graphVM.CanvasWidth=graphVM.InitialCanvasWidth*缩放因子;
}
graphVM.ResetLabels();
DeltaDistance=canvas.Width/totalSamples;
马克尔维马克雷德=
UIHelperView.FindChild(Application.Current.main窗口,“splitterRed”);
马克维马克格林=
UIHelperView.FindChild(Application.Current.main窗口,“splitterGreen”);
markers.Add(markerRed);
markers.Add(markerGreen);
//通过缩放移动标记
foreach(标记中的标记视图标记)
{
marker.Delta=DeltaDistance;//缩放后,如果移动标记,则此值将用于获得正确的位置
Canvas.SetLeft(marker,marker.XPosition*DeltaDistance);
}
标记。清除();
}
}
}
这是输出图片
这是缩放输出渲染转换不会影响控件的实际宽度/高度。尝试改用LayoutTransform。您能帮我吗?我试着使用LayoutTransform。这给了我更糟糕的结果。画布宽度没有增加。此外,通过layoutTransform无法正确实现缩放功能。能否在设置缩放变换的位置添加代码?如何计算画布宽度?我在上面添加了缩放代码。请看一看;graphVM=数据上下文作为GraphViewModel;