C#-如何打印宽高比/整页 [英] C# - How to print aspect ratio / full page
问题描述
我正在单击按钮时打印CHART控件:
I am printing the CHART control on button click:
chart1.SaveImage(ms, ChartImageFormat.Bmp);
Bitmap bm = new Bitmap(ms);
PrintDocument doc = new PrintDocument();
doc.PrintPage += (s, ev) =>
{
ev.Graphics.DrawImage(bm, Point.Empty); // adjust this to put the image elsewhere
ev.HasMorePages = false;
};
doc.DefaultPageSettings.Landscape = true;
doc.Print();
如何强制其打印控件,使其适合页面大小(保留长宽比)?
How do I force it to print the control so that it fits to the size of the page (preserving the aspect ratio)?
推荐答案
至少有两种不同的方法可以实现,这两种方法都包括缩放要打印的图像以适合页面的页面大小.选定的打印机:
There are at least two different ways to do it, both include scaling the image to be printed to fit the page size of the selected printer:
1)使用 .NET 工具(本人尚未对其进行测试,因此请取消使用帖子):
1) using .NET facilities (haven't tested it myself, lifted from this post):
private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
Image i = pictureBox1.Image;
float newWidth = i.Width * 100 / i.HorizontalResolution;
float newHeight = i.Height * 100 / i.VerticalResolution;
float widthFactor = newWidth / e.MarginBounds.Width;
float heightFactor = newHeight / e.MarginBounds.Height;
if(widthFactor>1 | heightFactor > 1)
{
if(widthFactor > heightFactor)
{
newWidth = newWidth / widthFactor;
newHeight = newHeight / widthFactor;
}
else
{
newWidth = newWidth / heightFactor;
newHeight = newHeight / heightFactor;
}
}
e.Graphics.DrawImage(i, 0, 0, (int)newWidth, (int)newHeight);
}
}
2) P/调用
2) P/Invoke'ing Windows API calls from the GDI and flat GDI (this is much more complex but faster and you can pass a plain byte array of a bitmap file (read file as byte[]), provide an email to me if need this code):
private static extern bool ClosePrinter(IntPtr hPrinter);
private static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter, IntPtr pd);
private static extern int SetJob(IntPtr hPrinter, int JobId, int Level, ref byte pJob, int Command_Renamed);
private static extern int GdiplusStartup(out IntPtr token, ref StartupInput input, out StartupOutput output);
private static extern int GdiplusShutdown(IntPtr token);
internal static extern int GdipLoadImageFromStream([In, MarshalAs(UnmanagedType.Interface)]IStream stream, out IntPtr image);
internal static extern int GdipDisposeImage(IntPtr image);
static internal extern int GdipCreateFromHDC2(IntPtr hDC, IntPtr hDevice, out IntPtr graphics);
static internal extern int GdipDeleteGraphics(IntPtr graphics);
static internal extern int GdipReleaseDC(IntPtr graphics, IntPtr hdc);
internal static extern int GdipGetImageDimension(IntPtr image, out float width, out float height);
internal static extern int GdipGetDpiX(IntPtr graphics, out float dpi);
internal static extern int GdipGetDpiY(IntPtr graphics, out float dpi);
static internal extern int GdipDrawImageRectI(IntPtr graphics, IntPtr image, int x, int y, int width, int height);
private static extern IntPtr CreateDC([MarshalAs(UnmanagedType.LPStr)] string lpszDriver, [MarshalAs(UnmanagedType.LPStr)] string lpszDevice, [MarshalAs(UnmanagedType.LPStr)] string lpszOutput, IntPtr lpInitData);
private static extern bool DeleteDC(IntPtr hdc);
private static extern int StartDoc(IntPtr hdc, DOCINFO lpdi);
private static extern int EndDoc(IntPtr hdc);
private static extern int StartPage(IntPtr hdc);
private static extern int EndPage(IntPtr hdc);
private static extern int GetDeviceCaps(IntPtr hdc, int nIndex);
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