2

配列からサイクルで LockBits を使用して画像を作成し、PictureBox.Width * n および Height にスケーリングします。

using (var bmp = new Bitmap(len, _height, PixelFormat.Format24bppRgb))
{
            var data = bmp.LockBits(new Rectangle(0, 0, len, _height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
            var bytes = data.Stride * data.Height;
            var rgb = new byte[bytes];
            var ptr = data.Scan0;
            Marshal.Copy(data.Scan0, rgb, 0, bytes);


            // …fill array „rgb“

            Marshal.Copy(rgb, 0, ptr, bytes);
            bmp.UnlockBits(data);

            g = _pictureBox.CreateGraphics();
            g.InterpolationMode = InterpolationMode.Default;
            g.DrawImage(bmp, _pictureBox.Width - len * _scaleWidth, 0, len * _scaleWidth, _pictureBox.Height);
}

次の反復では:

Graphics g;
        using (var bmp = new Bitmap(_pictureBox.Image))
        {
            g = _pictureBox.CreateGraphics();
            g.InterpolationMode = InterpolationMode.Default;
            g.DrawImage(_pictureBox.Image, new RectangleF(0, 0, _pictureBox.Width - len * _scaleWidth, _pictureBox.Height), new RectangleF(len * _scaleWidth, 0, _pictureBox.Width * _scaleWidth - len, _height), GraphicsUnit.Pixel);
        }
        g.Dispose();

要するに、画像をシフトする画像の一部を切り取ってコピーしましたが、何も得られません。前のステップのスケールのために可能ですか？たぶん私は間違っています。新しいビットマップをシフトして末尾に追加するアルゴリズムをアドバイスします。

4

2 に答える 2

1

PaintBox コントロールは非常に遅いため、Form インスタンスで Control.CreateGraphics() メソッドを使用し、Form に直接書き込むことをお勧めします。

私のヘルパー関数を使用してみてください。これにより、Win32 Interop を使用して、StretchBlt (ストレッチ) または BitBlt (ストレッチなし) を使用してビットマップの一部を貼り付けることができます。

使用例:

Graphics graphics = ...;
graphics.GdiDrawImage
(
    image, 
    new Rectangle(
        (int)rectangle.Left, 
        (int)rectangle.Top, 
        (int)rectangle.Width, 
        (int)rectangle.Height
    ), 
    0, 0, image.Width, image.Height
);

ソースコード：

public static class GraphicsHelper
{
    public static void GdiDrawImage(this Graphics graphics, Bitmap image, Rectangle rectangleDst, int nXSrc, int nYSrc, int nWidth, int nHeight)
    {
        IntPtr hdc = graphics.GetHdc();
        IntPtr memdc = GdiInterop.CreateCompatibleDC(hdc);
        IntPtr bmp = image.GetHbitmap();
        GdiInterop.SelectObject(memdc, bmp);
        GdiInterop.SetStretchBltMode(hdc, 0x04);
        GdiInterop.StretchBlt(hdc, rectangleDst.Left, rectangleDst.Top, rectangleDst.Width, rectangleDst.Height, memdc, nXSrc, nYSrc, nWidth, nHeight, GdiInterop.TernaryRasterOperations.SRCCOPY);
        //GdiInterop.BitBlt(..) put it here, if you did not mention stretching the source image
        GdiInterop.DeleteObject(bmp);
        GdiInterop.DeleteDC(memdc);
        graphics.ReleaseHdc(hdc);
    }
}

public class GdiInterop
{
    /// <summary>
    /// Enumeration for the raster operations used in BitBlt.
    /// In C++ these are actually #define. But to use these
    /// constants with C#, a new enumeration _type is defined.
    /// </summary>
    public enum TernaryRasterOperations
    {
        SRCCOPY = 0x00CC0020, // dest = source
        SRCPAINT = 0x00EE0086, // dest = source OR dest
        SRCAND = 0x008800C6, // dest = source AND dest
        SRCINVERT = 0x00660046, // dest = source XOR dest
        SRCERASE = 0x00440328, // dest = source AND (NOT dest)
        NOTSRCCOPY = 0x00330008, // dest = (NOT source)
        NOTSRCERASE = 0x001100A6, // dest = (NOT src) AND (NOT dest)
        MERGECOPY = 0x00C000CA, // dest = (source AND pattern)
        MERGEPAINT = 0x00BB0226, // dest = (NOT source) OR dest
        PATCOPY = 0x00F00021, // dest = pattern
        PATPAINT = 0x00FB0A09, // dest = DPSnoo
        PATINVERT = 0x005A0049, // dest = pattern XOR dest
        DSTINVERT = 0x00550009, // dest = (NOT dest)
        BLACKNESS = 0x00000042, // dest = BLACK
        WHITENESS = 0x00FF0062, // dest = WHITE
    };

    /// <summary>
    /// Enumeration to be used for those Win32 function 
    /// that return BOOL
    /// </summary>
    public enum Bool
    {
        False = 0,
        True
    };

    /// <summary>
    /// Sets the background color.
    /// </summary>
    /// <param name="hdc">The HDC.</param>
    /// <param name="crColor">Color of the cr.</param>
    /// <returns></returns>
    [DllImport("gdi32.dll")]
    public static extern int SetBkColor(IntPtr hdc, int crColor);

    /// <summary>
    /// CreateCompatibleDC
    /// </summary>
    [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern IntPtr CreateCompatibleDC(IntPtr hDC);

    /// <summary>
    /// DeleteDC
    /// </summary>
    [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern Bool DeleteDC(IntPtr hdc);

    /// <summary>
    /// SelectObject
    /// </summary>
    [DllImport("gdi32.dll", ExactSpelling = true)]
    public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);

    /// <summary>
    /// DeleteObject
    /// </summary>
    [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern Bool DeleteObject(IntPtr hObject);

    /// <summary>
    /// CreateCompatibleBitmap
    /// </summary>
    [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern IntPtr CreateCompatibleBitmap(IntPtr hObject, int width, int height);

    /// <summary>
    /// BitBlt
    /// </summary>
    [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern Bool BitBlt(IntPtr hObject, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hObjSource, int nXSrc, int nYSrc, TernaryRasterOperations dwRop);

    /// <summary>
    /// StretchBlt
    /// </summary>
    [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern Bool StretchBlt(IntPtr hObject, int nXOriginDest, int nYOriginDest, int nWidthDest, int nHeightDest, IntPtr hObjSource, int nXOriginSrc, int nYOriginSrc, int nWidthSrc, int nHeightSrc, TernaryRasterOperations dwRop);

    /// <summary>
    /// SetStretchBltMode
    /// </summary>
    [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern Bool SetStretchBltMode(IntPtr hObject, int nStretchMode);
}
于 2011-09-20T06:38:42.190 に答える