c# 自定义控件 平分3段中间一段画重下到上的45度斜线,2段画直线
时间: 2024-10-19 15:07:32 浏览: 9
在C#中,要创建自定义控件并在其中绘制特定样式(如3段分割,中间部分画一条从上至下的45度斜线,两侧画直线),你可以使用Windows Presentation Foundation (WPF)中的`Path`元素结合`Geometry`。以下是一个简单的示例,展示了如何实现这个功能:
```csharp
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
public class CustomSplitter : Control
{
public static readonly DependencyProperty SegmentLengthProperty = DependencyProperty.Register("SegmentLength", typeof(double), typeof(CustomSplitter), new FrameworkPropertyMetadata(100, OnSegmentLengthChanged));
private double segmentLength;
private GeometryGroup geometry;
public double SegmentLength
{
get { return segmentLength; }
set
{
if (value != segmentLength)
{
segmentLength = value;
UpdateGeometry();
NotifyPropertyChanged(SegmentLengthProperty);
}
}
}
protected override void OnRender(DrawingContext drawingContext)
{
base.OnRender(drawingContext);
if (geometry != null)
{
drawingContext.DrawGeometry(Brushes.Black, Pen, geometry);
}
}
private void OnSegmentLengthChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
UpdateGeometry();
}
private void UpdateGeometry()
{
geometry = new GeometryGroup();
// 中间斜线
var path1 = new Path();
path1.Data = new CubicBezierGeometry(new Point(segmentLength / 2, 0),
new Point(segmentLength / 2, -segmentLength * Math.Sqrt(2) / 2),
new Point(segmentLength / 2 + segmentLength * Math.Sqrt(2) / 4, -segmentLength / 2),
new Point(segmentLength / 2 + segmentLength * Math.Sqrt(2) / 4, 0));
path1.Stroke = Brushes.Black;
geometry.Children.Add(path1);
// 左侧直线
var path2 = new Path();
path2.Data = new LineGeometry(new Point(0, 0), new Point(segmentLength, 0));
path2.Stroke = Brushes.Black;
geometry.Children.Add(path2);
// 右侧直线
var path3 = new Path();
path3.Data = new LineGeometry(new Point(segmentLength, 0), new Point(segmentLength * 2, 0));
path3.Stroke = Brushes.Black;
geometry.Children.Add(path3);
}
// Implement the INotifyPropertyChanged interface to notify changes to the property.
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
```
要在XAML中使用这个自定义控件,只需添加如下代码:
```xml
<local:CustomSplitter x:Name="MyCustomSplitter" SegmentLength="200" />
```
在这个例子中,`SegmentLength`属性控制了每段的长度。当该属性改变时,`UpdateGeometry`方法会被调用,从而更新图形。
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