当鼠标在标记上单击中键时，我试图突出显示椭圆点标记。我想在使用点标记选择图表修饰符（PointMarkerSelectionModifier）缩放或平移图形时重新绘制标记。当图形被缩放或平移时如何翻译这些点，或者有更好的方法来做到这一点。
<sciChart:SciChartSurface x:Name="sciChartDetail"> <sciChart:SciChartSurface x:Name="sciChartDetail">
<sciChart:SciChartSurface.Annotations>
<sciChart:HorizontalLineAnnotation HorizontalAlignment="Stretch" LabelPlacement="Axis" LabelTextFormatting="0.00" Stroke="Blue" StrokeThickness="2" Y1="{Binding DataContext.DetailData.Mean, RelativeSource={RelativeSource AncestorType=UserControl}}" IsHidden="{Binding DataContext.DetailData.DisplayOptions.IsMeanHidden, RelativeSource={RelativeSource AncestorType=UserControl}}" ShowLabel="True" />
<sciChart:HorizontalLineAnnotation HorizontalAlignment="Stretch" LabelPlacement="Axis" LabelTextFormatting="0.00" Stroke="Brown" StrokeThickness="2" Y1="{Binding DataContext.DetailData.SigmaPlusThree, RelativeSource={RelativeSource AncestorType=UserControl}}" IsHidden="{Binding DataContext.DetailData.DisplayOptions.IsSigmaLineHidden, RelativeSource={RelativeSource AncestorType=UserControl}}" ShowLabel="True" />
<sciChart:HorizontalLineAnnotation HorizontalAlignment="Stretch" LabelPlacement="Axis" LabelTextFormatting="0.00" Stroke="Brown" StrokeThickness="2" Y1="{Binding DataContext.DetailData.SigmaMinusThree, RelativeSource={RelativeSource AncestorType=UserControl}}" IsHidden="{Binding DataContext.DetailData.DisplayOptions.IsSigmaLineHidden, RelativeSource={RelativeSource AncestorType=UserControl}}" ShowLabel="True" />
<sciChart:BoxAnnotation HorizontalAlignment="Stretch" Background="#3349E20E" BorderBrush="#7749E20E" BorderThickness="1" CornerRadius="3" IsEditable="False" X1="{Binding DataContext.DetailData.DateStart, RelativeSource={RelativeSource AncestorType=UserControl}}" X2="{Binding DataContext.DetailData.DateStop, RelativeSource={RelativeSource AncestorType=UserControl}}" Y1="{Binding DataContext.DetailData.LSL, RelativeSource={RelativeSource AncestorType=UserControl}}" Y2="{Binding DataContext.DetailData.USL, RelativeSource={RelativeSource AncestorType=UserControl}}" IsHidden="{Binding DataContext.DetailData.DisplayOptions.IsSpecLimitsHiddden, RelativeSource={RelativeSource AncestorType=UserControl}}"/>
</sciChart:SciChartSurface.Annotations>
<sciChart:SciChartSurface.RenderableSeries>
<sciChart:XyScatterRenderableSeries DataSeries="{Binding DataContext.DetailData.DataSeries, RelativeSource={RelativeSource AncestorType=UserControl}}" IsVisible="{Binding DataContext.DetailData.DisplayOptions.LineScatter, RelativeSource={RelativeSource AncestorType=UserControl}, Converter={StaticResource enumBooleanConverter}, ConverterParameter= {x:Static local:LineScatterRender.Scatter}}">
<sciChart:XyScatterRenderableSeries.PointMarker>
<sciChart:EllipsePointMarker Width="5" Height="5" Stroke="Blue" Fill="Green" StrokeThickness="3">
</sciChart:EllipsePointMarker>
</sciChart:XyScatterRenderableSeries.PointMarker>
</sciChart:XyScatterRenderableSeries>
</sciChart:SciChartSurface.RenderableSeries>
<sciChart:SciChartSurface.XAxes>
<sciChart:DateTimeAxis AutoRange="Once" GrowBy="0.01, 0.01" AxisTitle="{Binding DataContext.DetailData.DateRangeAxisLabel, RelativeSource={RelativeSource AncestorType=UserControl}}" VisibleRangeChanged="OnDateTimeAxisVisibleRangeChanged">
</sciChart:DateTimeAxis>
</sciChart:SciChartSurface.XAxes>
<sciChart:SciChartSurface.YAxes>
<sciChart:NumericAxis VisibleRange="{Binding DataContext.DetailData.SharedYVisibleRange, Mode=TwoWay, RelativeSource={RelativeSource AncestorType=UserControl}}" GrowBy="0.05, 0.05" Visibility="Hidden" AutoRange="Once" AxisAlignment="Left" AxisTitle="WF:Y" Style="{ets:ETStyleRef ResourceKey=AxisStyle}"/>
</sciChart:SciChartSurface.YAxes>
<sciChart:SciChartSurface.ChartModifier>
<sciChart:ModifierGroup>
<sciChart:RubberBandXyZoomModifier IsEnabled="True" IsXAxisOnly="False" ZoomExtentsY="False" IsAnimated="True" ExecuteOn="MouseRightButton"/>
<sciChart:MouseWheelZoomModifier ActionType="Zoom" Tag="SecondYAxis" ReceiveHandledEvents="True"/>
<sciChart:ZoomExtentsModifier XyDirection="XYDirection"/>
<sciChart:ZoomPanModifier Tag="SecondYAxis" IsEnabled="True" ExecuteOn="MouseLeftButton" XyDirection="XYDirection" ReceiveHandledEvents="True" ZoomExtentsY="True"/>
<util:PointMarkerSelectionModifier/>
</sciChart:ModifierGroup>
</sciChart:SciChartSurface.ChartModifier>
</sciChart:SciChartSurface>
public class PointMarkerSelectionModifier : ChartModifierBase
{
private Point? selectedPoint;
private Point _lastMousePoint;
public static readonly DependencyProperty LineBrushProperty = DependencyProperty.Register("LineBrush", typeof(Brush), typeof(PointMarkerSelectionModifier), new PropertyMetadata(new SolidColorBrush(Colors.LimeGreen), OnLineBrushChanged));
public static readonly DependencyProperty TextForegroundProperty = DependencyProperty.Register("TextForeground", typeof(Brush), typeof(PointMarkerSelectionModifier), new PropertyMetadata(new SolidColorBrush(Colors.White)));
public Brush TextForeground
{
get { return (Brush)GetValue(TextForegroundProperty); }
set { SetValue(TextForegroundProperty, value); }
}
public Brush LineBrush
{
get { return (Brush)GetValue(LineBrushProperty); }
set { SetValue(LineBrushProperty, value); }
}
public override void OnParentSurfaceRendered(SciChartRenderedMessage e)
{
base.OnParentSurfaceRendered(e);
}
public override void OnModifierMouseDown(ModifierMouseArgs e)
{
base.OnModifierMouseDown(e);
var allSeries = this.ParentSurface.RenderableSeries;
// Translates the mouse point to chart area, e.g. when you have left axis
selectedPoint = GetPointRelativeTo(e.MousePoint, this.ModifierSurface);
ClearModifierSurface();
// Add the rollover points to the surface
var hitTestResults = allSeries.Select(x => x.HitTest(selectedPoint.Value)).ToArray();
foreach (var hitTestResult in hitTestResults)
{
const int markerSize = 10;
// Create one ellipse per HitTestResult and position on the canvas
var ellipse = new Ellipse()
{
Width = markerSize,
Height = markerSize,
Stroke = Brushes.Red,
StrokeThickness = 2,
IsHitTestVisible = false,
Tag = typeof(PointMarkerSelectionModifier)
};
Canvas.SetLeft(ellipse, hitTestResult.HitTestPoint.X - markerSize * 0.5);
Canvas.SetTop(ellipse, hitTestResult.HitTestPoint.Y - markerSize * 0.5);
this.ModifierSurface.Children.Add(ellipse);
}
}
public override void OnModifierMouseMove(ModifierMouseArgs e)
{
// TODO : how to translate the selected point when the graph is zoomed or panned
}
private void ClearModifierSurface()
{
for (int i = ParentSurface.ModifierSurface.Children.Count - 1; i >= 0; --i)
{
if (((FrameworkElement)ParentSurface.ModifierSurface.Children[i]).Tag == typeof(PointMarkerSelectionModifier))
{
ParentSurface.ModifierSurface.Children.RemoveAt(i);
}
}
}
}