WPF实现头像裁剪

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初中物理：一门以理论实践为基础的自然科学。

高中物理：玄学。

初中化学：一门以实验结果为基础的应用科学。

高中化学：魔法。

初中数学：一个研究数量、变量、结构等的形式科学。

高中数学：占卜。

 

前言

需要做一个用户选择头像进行裁剪后保存。

效果预览：

 

代码如下：

<Grid>  <Border x:Name="containerPanel">   <Canvas x:Name="DrawCanvas"     VerticalAlignment="Center"      Background="Transparent"      Width="{Binding ElementName=containerPanel,Path=ActualWidth}"     Height="{Binding ElementName=containerPanel,Path=ActualHeight}">    <Rectangle x:Name="rectImage" VerticalAlignment="Center" HorizontalAlignment="Center"       Width="{Binding ElementName=containerPanel,Path=ActualWidth}"       Height="{Binding ElementName=containerPanel,Path=ActualHeight}">     <Rectangle.Fill>      <ImageBrush ImageSource="{Binding ImageSource,RelativeSource={ RelativeSource AncestorType={x:Type local:ImageCutCustoms}}}"/>     </Rectangle.Fill>    </Rectangle>    <Rectangle VerticalAlignment="Center" HorizontalAlignment="Center"       Width="{Binding ElementName=rectImage,Path=ActualWidth}"       Height="{Binding ElementName=rectImage,Path=ActualHeight}"       Fill="#99000000"/>    <Rectangle VerticalAlignment="Center" HorizontalAlignment="Center"       Width="{Binding ElementName=containerPanel,Path=ActualWidth}"       Height="{Binding ElementName=containerPanel,Path=ActualHeight}">     <Rectangle.Fill>      <ImageBrush ImageSource="{Binding ImageSource,RelativeSource={ RelativeSource AncestorType={x:Type local:ImageCutCustoms}}}"/>     </Rectangle.Fill>     <Rectangle.Clip>      <RectangleGeometry x:Name="rectRectangle" Rect="{Binding CutRect,RelativeSource={RelativeSource AncestorType={x:Type local:ImageCutCustoms}}}"/>     </Rectangle.Clip>    </Rectangle>    <local:DragDropView x:Name="dragDropItem"        Width="{Binding ElementName=rectRectangle, Path= Rect.Width}"       Height="{Binding ElementName=rectRectangle, Path= Rect.Height}"       Canvas.Left="{Binding ElementName=rectRectangle, Path= Rect.X}"       Canvas.Top="{Binding ElementName=rectRectangle, Path= Rect.Y}"       ParentMaxHeight="{Binding ElementName=DrawCanvas,Path=ActualHeight}"       ParentMaxWidth="{Binding ElementName=DrawCanvas,Path=ActualWidth}"/>       </Canvas>  </Border> </Grid>

逻辑代码：

public partial class ImageCutCustoms : UserControl {  public ImageSource ImageSource  {   get { return (ImageSource)GetValue(ImageSourceProperty); }   set { SetValue(ImageSourceProperty, value); }  }  // Using a DependencyProperty as the backing store for ImageSource. This enables animation, styling, binding, etc...  public static readonly DependencyProperty ImageSourceProperty =   DependencyProperty.Register("ImageSource", typeof(ImageSource), typeof(ImageCutCustoms), new PropertyMetadata(ImageSourcePropertyChangedCallback));  public ImageSource SaveImageSource  {   get { return (ImageSource)GetValue(SaveImageSourceProperty); }   set { SetValue(SaveImageSourceProperty, value); }  }  // Using a DependencyProperty as the backing store for SaveImageSource. This enables animation, styling, binding, etc...  public static readonly DependencyProperty SaveImageSourceProperty =   DependencyProperty.Register("SaveImageSource", typeof(ImageSource), typeof(ImageCutCustoms), new PropertyMetadata());  public Rect CutRect  {   get { return (Rect)GetValue(CutRectProperty); }   set { SetValue(CutRectProperty, value); }  }  // Using a DependencyProperty as the backing store for CutRect. This enables animation, styling, binding, etc...  public static readonly DependencyProperty CutRectProperty =   DependencyProperty.Register("CutRect", typeof(Rect), typeof(ImageCutCustoms), new PropertyMetadata());  private Point startPoint, endPoint;  public ImageCutCustoms()  {   InitializeComponent();   this.dragDropItem.UpdateImageEvent += DragDropItem_UpdateImageEvent;  }  private void DragDropItem_UpdateImageEvent()  {   var x = Canvas.GetLeft(dragDropItem);   var y = Canvas.GetTop(dragDropItem);   var w = dragDropItem.Width;   var h = dragDropItem.Height;   RenderTargetBitmap rtb = new RenderTargetBitmap((int)rectImage.RenderSize.Width, (int)rectImage.RenderSize.Height, 96d, 96d, System.Windows.Media.PixelFormats.Default);   rtb.Render(rectImage);   var crop = new CroppedBitmap(rtb, new Int32Rect((int)x, (int)y, (int)w, (int)h));   SaveImageSource = crop;   startPoint = new Point(x, y);   endPoint = new Point(x+w, y+h);   CutRect = new Rect(startPoint, endPoint);  }  private static void ImageSourcePropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)  {   var cutCustoms = d as ImageCutCustoms;   var x = cutCustoms.ActualWidth / 3;   var y = cutCustoms.ActualHeight / 3;   cutCustoms.startPoint = new Point(x, y);   cutCustoms.endPoint = new Point(x + 120, y + 120);   cutCustoms.CutRect = new Rect(cutCustoms.startPoint,cutCustoms.endPoint);  }   }

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blogs： https://www.cnblogs.com/yanjinhua/p/14345136.html

Github：https://github.com/yanjinhuagood

作者：驚鏵

出处：https://www.cnblogs.com/yanjinhua

版权：本作品采用「署名-非商业性使用-相同方式共享 4.0 国际」许可协议进行许可。

转载请著名作者 出处 https://github.com/yanjinhuagood

源码地址

Github：https://github.com/yanjinhuagood/CutImageSolution

Gitee：https://gitee.com/yanjinhua/CutImageSolution

原文转载：http://www.shaoqun.com/a/740787.html

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WPF开发者QQ群：340500857每日一笑初中物理：一门以理论实践为基础的自然科学。高中物理：玄学。初中化学：一门以实验结果为基础的应用科学。高中化学：魔法。初中数学：一个研究数量、变量、结构等的形式科学。高中数学：占卜。前言需要做一个用户选择头像进行裁剪后保存。效果预览：代码如下：<Grid><Borderx:Name="containerPanel"&
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