CroppedBitmap 实现头像裁剪

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 ·

2021-04-04 09:22

WPF开发者QQ群: 340500857 

前言

需要做一个用户选择头像进行裁剪后保存。

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); } }

预览效果:

386243f772c9d14b50d7d532cc8e3507.webp

24bb13ea19a4615da06d72d136269b5b.webp

WPF开发者QQ群: 340500857 

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

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