我有一个渲染大的图像,需要缩放用户光标下的部分.
我的图像在Grid中,并以这种方式在XAML中定义：
<Grid x:Name="RootImgGrid" Background="#FF333333" >
<ViewBox x:Name="imgViewBox" Margin="1,1,1" Stretch="Fill" >
<Canvas x:Name="imgCanvas" ClipToBounds="True" Width="{Binding ElementName=RootImgGrid,Path=ActualWidth}" Height="{Binding ElementName=RootImgGrid,Path=ActualHeight}">
<Image x:Name="imgObj" MouseWheel="img_MouseWheel" Cursor="Hand" MouseMove="Img_MouseMove" MouseDown="Img_MouseDown" MouseUp="Img_MouseUp" >
<Image.RenderTransform>
<TransformGroup x:Name="imgTransformGroup">
<ScaleTransform x:Name="imgScaleTransform"></ScaleTransform>
<TranslateTransform x:Name="imgTranslateTransform"></TranslateTransform>
</TransformGroup>
</Image.RenderTransform>
<Image.LayoutTransform>
<RotateTransform x:Name="imgRotateTransform"></RotateTransform>
</Image.LayoutTransform>
</Image>
</Canvas>
</ViewBox>
</Grid>
我有一个缩放区域应该出现在我的光标下缩放2倍的图像.
<ViewBox x:Name="imgViewBoxMagnifier" Width="400" Height="90"> <Canvas x:Name="imgCanvasMagnifier" Width="400" Height="90"> <Canvas.Clip> <RectangleGeometry Rect="0,400,90" /> </Canvas.Clip> <Image x:Name="imgMagnifier" Margin="2" Width="400" Height="90"> <Image.RenderTransform> <TransformGroup x:Name="imgMagnifierTransformGroup"> <ScaleTransform x:Name="imgMagnifierScaleTransform"></ScaleTransform> <TranslateTransform x:Name="imgMagnifierTranslateTransform"></TranslateTransform> </TransformGroup> </Image.RenderTransform> <Image.LayoutTransform> <RotateTransform x:Name="imgMagnifierRotateTransform"></RotateTransform> </Image.LayoutTransform> </Image> </Canvas> </ViewBox>
public void Magnifier(Canvas imgCanvas,Image imgObject,Image imgMagnifier,MouseEventArgs e)
{
Int32 width = 400;
Int32 height = 90;
if (imgMagnifier.Source != imgObject.Source)
{
imgMagnifier.Source = imgObject.Source;
}
Size size = imgObject.RenderSize;
RotateTransform rt = (RotateTransform)imgObject.LayoutTransform;
TranslateTransform tt = (TranslateTransform)((TransformGroup)imgObject.RenderTransform).Children[1];
ScaleTransform st = (ScaleTransform)((System.Windows.Media.TransformGroup)(imgObject.RenderTransform)).Children[0];
Double x = e.GetPosition(imgCanvas).X - tt.X;
Double y = e.GetPosition(imgCanvas).Y - tt.Y;
Point pos = e.MouseDevice.GetPosition(imgCanvas);
TransformGroup transformGroup = new TransformGroup();
ScaleTransform scale = new ScaleTransform();
scale.CenterX = x;
scale.CenterY = y;
scale.ScaleX = st.ScaleX * 10;
scale.ScaleY = st.ScaleY * 10;
transformGroup.Children.Add(scale);
TranslateTransform translate = new TranslateTransform();
translate.X = ??????????????????;
translate.Y = ??????????????????;
transformGroup.Children.Add(translate);
imgMagnifier.RenderTransform = transformGroup;
}
我怎样才能找到那些“????????”的正确值
translate.X = -x * 10 / (size.Width / 400); translate.Y = -y * 10 / (size.Height / 90);
提前致谢.
解决方法
由于我没有找到任何打包解决方案,我从头开发了一个功能齐全的Microsoft VS 2010项目放大镜Zoom C#4.0 WPF.
它包括放大,缩小,旋转,适合宽度和放大区域.
随意下载,并使其更好.
希望你喜欢.如果你发现它有用,请投票.
public void Magnifier(Canvas imgCanvas,Canvas imgCanvasMagnifier,MouseEventArgs e)
{
Double width = imgCanvasMagnifier.Width;
Double height = imgCanvasMagnifier.Height;
Int32 zoom = 3;
String txtDebug = String.Empty;
String txtZoom = String.Empty;
if (imgMagnifier.Source != imgObject.Source)
{
imgMagnifier.Source = imgObject.Source;
}
Size size = imgObject.RenderSize;
RotateTransform rt = (RotateTransform)imgObject.LayoutTransform;
TranslateTransform tt = (TranslateTransform)((TransformGroup)imgObject.RenderTransform).Children[1];
ScaleTransform st = (ScaleTransform)((System.Windows.Media.TransformGroup)(imgObject.RenderTransform)).Children[0];
Double x = e.GetPosition(imgCanvas).X - tt.X;
Double y = e.GetPosition(imgCanvas).Y - tt.Y;
Point pos = e.MouseDevice.GetPosition(imgCanvas);
var wnd = Canvas.GetTop(imgObject);
TransformGroup transformGroup = new TransformGroup();
ScaleTransform scale = new ScaleTransform();
scale.ScaleX = st.ScaleX * zoom;
scale.ScaleY = st.ScaleY * zoom;
RotateTransform rotate = new RotateTransform();
rotate.Angle = rt.Angle;
TranslateTransform translate = new TranslateTransform();
Double centerX = st.CenterX * (st.ScaleX - 1);
Double centerY = st.CenterY * (st.ScaleY - 1);
if (rt.Angle == 0)
{
translate.X = -(x + centerX) / st.ScaleX;
translate.Y = -(y + centerY) / st.ScaleY;
scale.CenterX = (x + centerX) / st.ScaleX;
scale.CenterY = (y + centerY) / st.ScaleY;
}
if (rt.Angle == 90)
{
translate.X = -(x + centerX) / st.ScaleX;
translate.Y = -(y + centerY) / st.ScaleY;
translate.X += imgObject.ActualHeight * st.ScaleX * zoom;
scale.CenterX = (x + centerX) / st.ScaleX;
scale.CenterY = (y + centerY) / st.ScaleY;
}
if (rt.Angle == 180)
{
translate.X = -(x + centerX) / st.ScaleX;
translate.Y = -(y + centerY) / st.ScaleY;
translate.X += imgObject.ActualWidth * st.ScaleX * zoom;
translate.Y += imgObject.ActualHeight * st.ScaleY * zoom;
scale.CenterX = (x + centerX) / st.ScaleX;
scale.CenterY = (y + centerY) / st.ScaleY;
}
if (rt.Angle == 270)
{
translate.X = -(x + centerX) / st.ScaleX;
translate.Y = -(y + centerY) / st.ScaleY;
translate.Y += imgObject.ActualWidth * st.ScaleX * zoom;
scale.CenterX = (x + centerX) / st.ScaleX;
scale.CenterY = (y + centerY) / st.ScaleY;
}
translate.X += width / 2;
translate.Y += height / 2;
transformGroup.Children.Add(rotate);
transformGroup.Children.Add(scale);
transformGroup.Children.Add(translate);
imgMagnifier.RenderTransform = transformGroup;
}
