WPF示例-4-动态制作放大镜

最终效果如图：

后台代码如下：

/// <summary>
/// Window6.xaml 的交互逻辑
/// </summary>
public partial class Window6 : Window
{
Grid myGrid = new Grid();
Grid myGd = new Grid();
Canvas canvasOne = new Canvas();
Canvas canvasTwo = new Canvas() { Name = "myCanvas" };
Path pathTwo = null;

public Window6()
{
InitializeComponent();
Init(); //初始化控件
this.myGridContent.PreviewMouseMove += new MouseEventHandler(myGridContent_PreviewMouseMove);

//为最外层的Grid添加鼠标移动事件
VisualBrush vb = (VisualBrush)pathTwo.Fill;
vb.Visual = myGd; //指定加载时显示的放大区域
}

//初始化控件
void Init()
{
#region 放大镜区域-Grid

//线
Line line = new Line()
{
X1 = 150,
Y1 = 140,
X2 = 300,
Y2 = 250,
StrokeThickness = 30,
Stroke = new LinearGradientBrush() //使用线性渐变绘制区域
{
StartPoint = new Point(0,0),//开始位置
EndPoint = new Point(0,1),//结束位置
GradientStops = new GradientStopCollection() //渐变的颜色
{
new GradientStop(Colors.White,
new GradientStop(Colors.Black,0)
}
}
};

//路径-1
Path pathOne = new Path()
{
Fill = new SolidColorBrush(Colors.White),
Width = 200,
Height = 200,
Data = new GeometryGroup()
{
Children = new GeometryCollection()
{
new EllipseGeometry(new Point(100,100),100,//从中心开始，画一个圆，半径是100
new EllipseGeometry(new Point(100,1,1) //从中心开始，画一个小圆，半径是1
}
}
};

//路径-2
pathTwo = new Path()
{
Name = "myPath",
Fill = new VisualBrush()
{
Viewbox = new Rect(0,30,30),
ViewboxUnits = BrushMappingMode.Absolute,
Viewport = new Rect(0,
ViewportUnits = BrushMappingMode.RelativeToBoundingBox
},1) //从中心开始，画一个小圆，半径是1
}
}
};

//圆-1
Ellipse ellipSEOne = new Ellipse()
{
Width = 200,
StrokeThickness = 10,
Stroke = new LinearGradientBrush()
{
StartPoint = new Point(0,
EndPoint = new Point(0,
GradientStops = new GradientStopCollection()
{
new GradientStop(Colors.Black,
new GradientStop(Colors.White,1)
}
}
};

//圆-2
Ellipse ellipseTwo = new Ellipse()
{
Width = 200,0)
}
}
};

myGrid.Children.Add(canvasOne);

canvasOne.Children.Add(canvasTwo);

canvasTwo.Children.Add(line);
canvasTwo.Children.Add(pathOne);
canvasTwo.Children.Add(pathTwo);
canvasTwo.Children.Add(ellipSEOne);
canvasTwo.Children.Add(ellipseTwo);
#endregion

#region 需要放大的内容区域-myGd
Button btn = new Button()
{
Margin = new Thickness(70,73,134,
Height = 28,
Content = "Administrator",
VerticalAlignment = VerticalAlignment.Top
};

Label lbl = new Label()
{
Margin = new Thickness(70,39,88,
VerticalAlignment = VerticalAlignment.Top
};

myGd.Children.Add(btn);
myGd.Children.Add(lbl);
#endregion

myGridContent.Children.Add(myGd);
myGridContent.Children.Add(myGrid);

}

void myGridContent_PreviewMouseMove(object sender,MouseEventArgs e) { VisualBrush vb = (VisualBrush)pathTwo.Fill; Point point = e.MouseDevice.GetPosition(myGd); Rect rc = vb.Viewbox; rc.X = point.X - rc.Width / 2; rc.Y = point.Y - rc.Height / 2; vb.Viewbox = rc; Canvas.SetLeft(canvasTwo,point.X - pathTwo.Width / 2); Canvas.SetTop(canvasTwo,point.Y - pathTwo.Height / 2); } }

（编辑：李大同）

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