原文网址:https://www.cnblogs.com/Uncle-Joker/p/13690862.html
在XAML代码设计器中,添加canvas画布与圆形几何对象,利用VisualBrush笔刷来复制画面内容到指定容器:
![复制代码](https://common.cnblogs.com/images/copycode.gif)
<Canvas x:Name="CvsGlass" Width="106" Height="106" HorizontalAlignment="Left" VerticalAlignment="Top" MouseWheel="CvsGlass_MouseWheel" MouseDown="CvsGlass_MouseDown" MouseUp="CvsGlass_MouseUp" MouseMove="CvsGlass_MouseMove" MouseLeave="CvsGlass_MouseLeave"> <Canvas.RenderTransform> <TransformGroup> <ScaleTransform/> </TransformGroup> </Canvas.RenderTransform> <Canvas Name="magnifierCanvas"> <Ellipse Width="106" Height="106" > <Ellipse.Fill> <LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0"> <GradientStop Color="#FFD9D2D2" Offset="1"/> <GradientStop Color="White"/> <GradientStop Color="#FFDFDFDF" Offset="0.244"/> <GradientStop Color="#FF777777" Offset="0.592"/> </LinearGradientBrush> </Ellipse.Fill> </Ellipse> <Ellipse Width="100" Height="100" Canvas.Left="3" Canvas.Top="3" Fill="Black"/> <Ellipse Width="100" Height="100" Name="magnifierEllipse" Canvas.Left="3" Canvas.Top="3"> <Ellipse.Fill> <VisualBrush ViewboxUnits="Absolute" Viewbox="0,0,100,100" ViewportUnits="RelativeToBoundingBox" Viewport="0,0,1,1"/> </Ellipse.Fill> </Ellipse> <TextBlock x:Name="TxtGlassScale" Foreground="Yellow" Visibility="Hidden" FontSize="14" Margin="110,40,0,55" FontFamily="Microsoft YaHei"> <TextBlock.Effect> <DropShadowEffect/> </TextBlock.Effect> </TextBlock> </Canvas> </Canvas>
![复制代码](https://common.cnblogs.com/images/copycode.gif)
得到一个类似放大镜的界面效果:
![](/i/l/?n=20&i=blog/1083581/202009/1083581-20200918132832552-1316143607.png)
其中,TxtGlassScale是显示放大镜倍数的文字控件;
VisualBrush是内容笔刷,看效果:
![](/i/l/?n=20&i=blog/1083581/202009/1083581-20200918134116788-1812383817.gif)
其中需要注意的是,放大镜应该是和Box平级,属于Cell的子控件,这样在图像平铺模式下则能兼容所有图像范围:
![](/i/l/?n=20&i=blog/1083581/202009/1083581-20200918134354676-2073383686.png)
看效果:
![](/i/l/?n=20&i=blog/1083581/202009/1083581-20200918134635370-1159933432.gif)
参考代码:
![复制代码](https://common.cnblogs.com/images/copycode.gif)
#region -----放大镜-----/// <summary> /// 当前大小与vs设计器中的大小的比例 /// </summary> public double ActualScaleVal = 0; /// <summary> /// 放大比例 /// </summary> double glassScale = 2.0; /// <summary> /// 放大镜视图范围宽度 /// </summary> double glassWidth = 0; /// <summary> /// 放大镜视图范围高度 /// </summary> double glassHeight = 0; /// <summary> /// 显示放大镜 /// </summary> public void UseGlass() { if (CvsGlass.IsShow()) { CvsGlass.Hide(); return; } if (glassWidth == 0 || glassHeight == 0) { //计算放大镜比例 100是放大镜的viewbox的大小 glassWidth = 100 / glassScale; glassHeight = 100 / glassScale; } TxtGlassScale.Foreground = shapeManager.shapeMeasureColor; TxtGlassScale.FontSize = shapeManager.shapeMeasureFontSize; SetGlassViewBox(ActualWidth, ActualHeight, new Point(), true); CvsGlass.Show(); } /// <summary> /// 关闭放大镜 /// </summary> public void CloseGlass() { CvsGlass.Hide(); } //滚轮控制放比例 private void CvsGlass_MouseWheel(object sender, MouseWheelEventArgs e) { if (e.Delta > 0) { glassScale -= 0.05; } else { glassScale += 0.05; } glassScale = glassScale < 0.1 ? 0.1 : glassScale; glassScale = glassScale > 5 ? 5 : glassScale; glassWidth = 100 / glassScale; glassHeight = 100 / glassScale; Point pos = e.MouseDevice.GetPosition(GridMain); SetGlassViewBox(pos.X, pos.Y, new Point(), false, false); TxtGlassScale.Text = ((glassScale * ActualScaleVal * 2) * 100).ToString("f1") + "%"; TxtGlassScale.Show(); } //是否按下放大镜鼠标 bool isGlassDown = false; //记录按下鼠标的位置 Point glassPoint = new Point(0, 0); //按下放大镜 private void CvsGlass_MouseDown(object sender, MouseButtonEventArgs e) { glassPoint.X = e.GetPosition(CvsGlass).X; glassPoint.Y = e.GetPosition(CvsGlass).Y; isGlassDown = true; } //移动放大镜 private void CvsGlass_MouseMove(object sender, MouseEventArgs e) { if (isGlassDown) { //相对于 GridLine 获取鼠标的坐标 Point svMainPos = e.MouseDevice.GetPosition(ScrollCell); Point glassPos = e.MouseDevice.GetPosition(CvsGlass); SetGlassViewBox(glassPos.X, glassPos.Y, svMainPos, false); Mouse.Capture(CvsGlass); } } /// <summary> /// 设置放大内容 /// </summary> /// <param name="vbX">宽度参数</param> /// <param name="vbY">高度参数</param> /// <param name="svMainPos">相对于GridLine的坐标</param> /// <param name="isInit">是否是初始化</param> /// <param name="reLocation">是否重新定位坐标</param> private void SetGlassViewBox(double vbX, double vbY, Point svMainPos, bool isInit = false, bool reLocation = true) { Rect viewBox = GlassVB.Viewbox; double xoffset = viewBox.Width / 2.0; double yoffset = viewBox.Height / 2.0; if (isInit) { viewBox.X = (vbX - xoffset) / 2; viewBox.Y = (vbY - yoffset) / 2; CvsGlass.Margin = new Thickness((vbX - 106) / 2, (vbY - 106) / 2, (vbX - 106) / 2, (vbY - 106) / 2); } else { if (reLocation) { viewBox.X = svMainPos.X - xoffset - (vbX - 106 / 2); viewBox.Y = svMainPos.Y - yoffset - (vbY - 106 / 2); CvsGlass.Margin = new Thickness( CvsGlass.Margin.Left + vbX - glassPoint.X, CvsGlass.Margin.Top + vbY - glassPoint.Y, CvsGlass.Margin.Right - vbX + glassPoint.X, CvsGlass.Margin.Bottom - vbY + glassPoint.Y); } } viewBox.Width = glassWidth; viewBox.Height = glassHeight; GlassVB.Viewbox = viewBox; TxtGlassScale.Hide(); } private void CvsGlass_MouseLeave(object sender, MouseEventArgs e) { isGlassDown = false; } private void CvsGlass_MouseUp(object sender, MouseButtonEventArgs e) { isGlassDown = false; Mouse.Capture(null); } /// <summary> /// 重新设置放大镜大小和位置 /// </summary> public void ReSetGlass() { if (BoxList.Count == 0) { return; } //*2是因为放大镜在vs设计器中显小 放大两倍 BoxList[0].SetScaleTrans(CvsGlass, ActualScaleVal * 2, ActualScaleVal * 2, false); if (CvsGlass.Margin.Left >= ActualWidth || CvsGlass.Margin.Top >= ActualHeight) { CvsGlass.Margin = new Thickness((ActualWidth - 106) / 2, (ActualHeight - 106) / 2, (ActualWidth - 106) / 2, (ActualHeight - 106) / 2); } } #endregion
![复制代码](https://common.cnblogs.com/images/copycode.gif)
C#开发PACS、RIS、3D医学影像处理系统系列教程 目录整理:
菜鸟入门篇
PACS客户端:
C#开发PACS医学影像处理系统(七):读取影像Dicom信息
C#开发PACS医学影像处理系统(十):Dicom影像下载策略与算法
C#开发PACS医学影像处理系统(十一):Dicom影像挂片协议
C#开发PACS医学影像处理系统(十二):绘图处理之图形标记
C#开发PACS医学影像处理系统(十三):绘图处理之病灶测量
C#开发PACS医学影像处理系统(十四):处理Dicom影像窗宽窗位
C#开发PACS医学影像处理系统(十五):Dicom影像交叉定位线算法
C#开发PACS医学影像处理系统(十六):2D处理之影像平移和缩放
C#开发PACS医学影像处理系统(十七):2D处理之影像旋转和翻转
C#开发PACS医学影像处理系统(十八):Dicom使用LUT色彩增强和反色
C#开发PACS医学影像处理系统(十九):Dicom影像放大镜
标签:CvsGlass,PACS,C#,放大镜,医学影像,glassScale From: https://www.cnblogs.com/bruce1992/p/17015792.html