【C#/WPF】图片的切割/切图/裁剪图片

前台准备两个Image控件。上面是显示原图，下面显示切割后的效果。

<StackPanel Orientation="Vertical">

    <Image Width="450" Height="383" Source="C:\Users\Administrator\Documents\Visual Studio 2015\Projects\SplitPic\SplitPic\Images\1.jpg"/>

    <Image x:Name="img" Stretch="None" Width="450" Height="383" />

</StackPanel>

对应的后台代码：

public partial class MainWindow : Window

{

    public MainWindow()

    {

        InitializeComponent();

        // 设置原图

        img.Source = new BitmapImage(new Uri(@"Images/1.jpg", UriKind.Relative));

        // 切割图片

        ImageSource imageSource = img.Source;

        Bitmap bitmap = SystemUtils.ImageSourceToBitmap(imageSource);

        BitmapSource bitmapSource = SystemUtils.BitmapToBitmapImage(bitmap);

        BitmapSource newBitmapSource = SystemUtils.CutImage(bitmapSource, new Int32Rect(125, 60, 235, 285));

        // 使用切割后的图源

        img.Source = newBitmapSource;

    }

}

// 图像工具类

public static class SystemUtils

{

    /// <summary>

    /// 切图

    /// </summary>

    /// <param name="bitmapSource">图源</param>

    /// <param name="cut">切割区域</param>

    /// <returns></returns>

    public static BitmapSource CutImage(BitmapSource bitmapSource, Int32Rect cut)

    {

        //计算Stride

        var stride = bitmapSource.Format.BitsPerPixel * cut.Width / 8;

        //声明字节数组

        byte[] data = new byte[cut.Height * stride];

        //调用CopyPixels

        bitmapSource.CopyPixels(cut, data, stride, 0);

        return BitmapSource.Create(cut.Width, cut.Height, 0, 0, PixelFormats.Bgr32, null, data, stride);

    }

    // ImageSource --> Bitmap

    public static System.Drawing.Bitmap ImageSourceToBitmap(ImageSource imageSource)

    {

        BitmapSource m = (BitmapSource)imageSource;

        System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(m.PixelWidth, m.PixelHeight, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);

        System.Drawing.Imaging.BitmapData data = bmp.LockBits(

        new System.Drawing.Rectangle(System.Drawing.Point.Empty, bmp.Size), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);

        m.CopyPixels(Int32Rect.Empty, data.Scan0, data.Height * data.Stride, data.Stride); bmp.UnlockBits(data);

        return bmp;

    }

    // Bitmap --> BitmapImage

    public static BitmapImage BitmapToBitmapImage(Bitmap bitmap)

    {

        using (MemoryStream stream = new MemoryStream())

        {

            bitmap.Save(stream, ImageFormat.Bmp);

            stream.Position = 0;

            BitmapImage result = new BitmapImage();

            result.BeginInit();

            // According to MSDN, "The default OnDemand cache option retains access to the stream until the image is needed."

            // Force the bitmap to load right now so we can dispose the stream.

            result.CacheOption = BitmapCacheOption.OnLoad;

            result.StreamSource = stream;

            result.EndInit();

            result.Freeze();

            return result;

        }

    }

}

运行后的效果如下：

补充：关于剪裁的位置和区域的填写说明，如下图。