C# 在图片框中移动位图
我使用 LockBits 从循环数组创建图像，并缩放到 PictureBox.Width * n 和高度：
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);
}
在下一次迭代中：
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();
简而言之：我剪切并复制了会移动图片的图像部分，但没有得到任何内容。是否可能是因为上一步中的规模？ 也许我错了。建议用于移动并添加新位图到末尾的算法。
I create image with LockBits from array in cycle and scale to PictureBox.Width * n and Height:
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);
}
In the next iterateration:
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();
In short: I cut and copy part of the image that would shift the picture, but do not get anything. Is it possible because of the scale in the previous step?
Maybe I'm wrong. Advise the algorithm for shifting and adding a new Bitmap into an end.
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我建议您在 Form 实例中使用 Control.CreateGraphics() 方法，并直接在 Form 上写入，因为 PaintBox 控件非常慢。
尝试使用我的辅助函数，这将允许您使用 Win32 Interop 使用 StretchBlt（拉伸）或 BitBlt（无拉伸）来粘贴位图的一部分：
示例用法：
源代码：
I advice you to use Control.CreateGraphics() method at Form instance, and write on a Form directly, because PaintBox control is quite slow.
Try using my helper function, this will allow you to paste a portion of your bitmap using StretchBlt (stretching) or BitBlt (no stretching) using Win32 Interop:
Sample usage:
Source code:
注意：这不是问题的完整答案，但我想为现有答案提供一些有用的信息。
与 Artur Mustafin 的答案相反，我建议不要直接使用 Windows GDI，但要使用
图形类。在我的测试中，它们的性能比 GDI 函数好得多。GDI代码取自Artur Mustafin的答案。
测试通过在 Paint 事件中进行绘制，在 1k x 1k Picturebox 中显示 1Mpix (1k x 1k) 位图或 100Mpix (10k x 10k) 位图的图像。
测试是在 Windows 7 Pro x64 SP1、调试模式、Intel Core i7-3630QM CPU @ 2.4 GHz、16 GB RAM 上的 Visual Studio 2015.3 中完成的。
结果：
测试代码：
Notice: This is no full answer to the question, but I want to provide some useful information to the existing answer.
In contrast to the answer of Artur Mustafin, I suggest not to use the Windows GDI directly, but to use the .net methods of the
Graphicsclass. In my tests they have performed a lot better than the GDI functions.The GDI code is taken from the answer of Artur Mustafin.
The test was displaying an image of 1Mpix (1k x 1k) Bitmap or 100Mpix (10k x 10k) Bitmap in 1k x 1k Picturebox by drawing in the Paint event.
The tests were done in Visual Studio 2015.3 on Windows 7 Pro x64 SP1, Debug mode, on an Intel Core i7-3630QM CPU @ 2.4 GHz, 16 GB RAM.
Results:
Test code: