WPF 放大镜

时间：2014-09-24 12:31:16 阅读：205 评论：0 收藏：0 [点我收藏+]

WPF 放大镜

WPF 放大镜是以VisualBrush实现的，单击左键放下放大镜，接下来可以对页面的控件进行操作，单击放大镜可以再次获取放大镜，放大镜效果如下：

参考资源：http://www.cnblogs.com/zhihai/archive/2012/02/03/2337161.html

下面是后台全部代码：

public partial class MainWindow : Window
{
#region 添加放大镜
Grid myGrid = new Grid();
Canvas canvasOne = new Canvas();
Canvas canvasTwo = new Canvas() { Name = "myCanvas" };
Path pathTwo = null;
int i = 0;
#endregion
public MainWindow()
{
InitializeComponent();
initVisualBrush();
this.grid1.PreviewMouseMove += new MouseEventHandler(grid1_PreviewMouseMove);
this.MouseDown += new MouseButtonEventHandler(EnergyOverview_MouseDown);
VisualBrush vb = (VisualBrush)pathTwo.Fill;
//指定加载时显示的放大区域
vb.Visual = grid2;
}
#region 放大镜相关操作
//初始化放大镜
private void initVisualBrush()
{
#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,1),
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),100,100), //从中心开始，画一个圆，半径是100
new EllipseGeometry(new Point(100,100),1,1) //从中心开始，画一个小圆，半径是1
}
}
};
//路径-2
pathTwo = new Path()
{
Name = "myPath",
Width = 200,
Height = 200,
Fill = new VisualBrush()
{
Viewbox = new Rect(0, 0, 120, 120),
ViewboxUnits = BrushMappingMode.Absolute,
Viewport = new Rect(0, 0, 1, 1),
ViewportUnits = BrushMappingMode.RelativeToBoundingBox
},
Data = new GeometryGroup()
{
Children = new GeometryCollection()
{
new EllipseGeometry(new Point(100,100),100,100), //从中心开始，画一个圆，半径是100
new EllipseGeometry(new Point(100,100),1,1) //从中心开始，画一个小圆，半径是1
}
}
};
//圆-1
Ellipse ellipseOne = new Ellipse()
{
Width = 200,
Height = 200,
StrokeThickness = 10,
Stroke = new LinearGradientBrush()
{
StartPoint = new Point(0, 0),
EndPoint = new Point(0, 1),
GradientStops = new GradientStopCollection()
{
new GradientStop(Colors.Black,0),
new GradientStop(Colors.White,1)
}
}
};
//圆-2
Ellipse ellipseTwo = new Ellipse()
{
Width = 200,
Height = 200,
StrokeThickness = 10,
Stroke = new LinearGradientBrush()
{
StartPoint = new Point(0, 0),
EndPoint = new Point(0, 1),
GradientStops = new GradientStopCollection()
{
new GradientStop(Colors.Black,1),
new GradientStop(Colors.White,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
//myGd.Children.Add(dataGrid2);
//将放大镜加入页面
grid1.Children.Add(myGrid);
}
//获取或者放下放大镜
void EnergyOverview_MouseDown(object sender, MouseEventArgs e)
{
if (i == 0)
this.grid1.PreviewMouseMove -= new MouseEventHandler(grid1_PreviewMouseMove);
else
this.grid1.PreviewMouseMove += new MouseEventHandler(grid1_PreviewMouseMove);
i = (i + 1) % 2;
}
//放大镜移动
void grid1_PreviewMouseMove(object sender, MouseEventArgs e)
{
VisualBrush vb = (VisualBrush)pathTwo.Fill;
Point point = e.MouseDevice.GetPosition(grid2);
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);
}
#endregion

}

下面是前台页面：

源码位置：http://download.csdn.net/detail/luozuolincool/7966467

WPF 放大镜

标签：wpf 放大镜 visualbrush

原文地址：http://blog.csdn.net/luozuolincool/article/details/39519425

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