我想在很多页面上打印一张高（长）图像。因此，在每个页面中，我从图像中选取一个合适的部分，然后在页面中绘制它。
问题是我在页面中缩小了图像（其形状被压缩），所以我添加了一个其值为1500的比例。 如果我知道页面的高度（e.Graphics），我认为我可以解决问题。 要将英寸转换为像素，我必须乘以（e.Graphics.DpiX = 600）或乘以96。void printdocument_PrintPage(object sender, PrintPageEventArgs e)
{
if (pageImage == null)
return;
e.Graphics.PageUnit = GraphicsUnit.Pixel;
e.Graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
e.Graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
float a = (e.MarginBounds.Width / 100) * e.Graphics.DpiX;
float b = ((e.MarginBounds.Height / 100) * e.Graphics.DpiY);
int scale = 1500;
scale = 0; //try to comment this
RectangleF srcRect = new RectangleF(0, startY, pageImage.Width, b - scale);
RectangleF destRect = new RectangleF(0, 0, a, b);
e.Graphics.DrawImage(pageImage, destRect, srcRect, GraphicsUnit.Pixel);
startY = Convert.ToInt32(startY + b - scale);
e.HasMorePages = (startY < pageImage.Height);
}
请你让它正常工作。
您可以从（here）下载源代码。
先谢谢。
答案 0 :(得分：2)
我试图完成你的任务。 干得好。希望它有所帮助。
此方法在多个页面上打印图像（如果图像很小，则打印一个图像）。
private void printImage_Btn_Click(object sender, EventArgs e)
{
list = new List<Image>();
Graphics g = Graphics.FromImage(image_PctrBx.Image);
Brush redBrush = new SolidBrush(Color.Red);
Pen pen = new Pen(redBrush, 3);
decimal xdivider = image_PctrBx.Image.Width / 595m;
int xdiv = Convert.ToInt32(Math.Ceiling(xdivider));
decimal ydivider = image_PctrBx.Image.Height / 841m;
int ydiv = Convert.ToInt32(Math.Ceiling(ydivider));
/*int xdiv = image_PctrBx.Image.Width / 595; //This is the xsize in pt (A4)
int ydiv = image_PctrBx.Image.Height / 841; //This is the ysize in pt (A4)
// @ 72 dots-per-inch - taken from Adobe Illustrator
if (xdiv >= 1 && ydiv >= 1)
{*/
for (int i = 0; i < xdiv; i++)
{
for (int y = 0; y < ydiv; y++)
{
Rectangle r;
try
{
r = new Rectangle(i * Convert.ToInt32(image_PctrBx.Image.Width / xdiv),
y * Convert.ToInt32(image_PctrBx.Image.Height / ydiv),
image_PctrBx.Image.Width / xdiv,
image_PctrBx.Image.Height / ydiv);
}
catch (Exception)
{
r = new Rectangle(i * Convert.ToInt32(image_PctrBx.Image.Width / xdiv),
y * Convert.ToInt32(image_PctrBx.Image.Height),
image_PctrBx.Image.Width / xdiv,
image_PctrBx.Image.Height);
}
g.DrawRectangle(pen, r);
list.Add(cropImage(image_PctrBx.Image, r));
}
}
g.Dispose();
image_PctrBx.Invalidate();
image_PctrBx.Image = list[0];
PrintDocument printDocument = new PrintDocument();
printDocument.PrintPage += PrintDocument_PrintPage;
PrintPreviewDialog previewDialog = new PrintPreviewDialog();
previewDialog.Document = printDocument;
pageIndex = 0;
previewDialog.ShowDialog();
// don't forget to detach the event handler when you are done
printDocument.PrintPage -= PrintDocument_PrintPage;
}
此方法以所需尺寸（A4尺寸）打印列表中的每张图片：
private void PrintDocument_PrintPage(object sender, PrintPageEventArgs e)
{
// Draw the image for the current page index
e.Graphics.DrawImageUnscaled(list[pageIndex],
e.PageBounds.X,
e.PageBounds.Y);
// increment page index
pageIndex++;
// indicate whether there are more pages or not
e.HasMorePages = (pageIndex < list.Count);
}
此方法裁剪图像并返回图像的每个部分：
private static Image cropImage(Image img, Rectangle cropArea)
{
Bitmap bmpImage = new Bitmap(img);
Bitmap bmpCrop = bmpImage.Clone(cropArea, System.Drawing.Imaging.PixelFormat.DontCare);
return (Image)(bmpCrop);
}
图像从PictureBox加载，因此请确保加载图像。 （尚无异常处理）。
internal string tempPath { get; set; }
private int pageIndex = 0;
internal List<Image> list { get; set; }
这些变量被定义为全局变量。
您可以在此处下载示例项目：
http://www.abouchleih.de/projects/PrintImage_multiplePages.zip //旧版本 http://www.abouchleih.de/projects/PrintImage_multiplePages_v2.zip //新
答案 1 :(得分：0)
Cls_PanelPrinting.Print Print = new Cls_PanelPrinting.Print（PnlContent / Image）;
您必须传递面板或图像。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Printing;
namespace Cls_PanelPrinting
{
public class Print
{
readonly PrintDocument printdoc1 = new PrintDocument();
readonly PrintPreviewDialog previewdlg = new PrintPreviewDialog();
public int page = 1;
internal string tempPath { get; set; }
private int pageIndex = 0;
internal List<Image> list { get; set; }
private int _Line = 0;
private readonly Panel panel_;
public Print(Panel pnl)
{
panel_ = pnl;
printdoc1.PrintPage += (printdoc1_PrintPage);
PrintDoc();
}
private void printdoc1_PrintPage(object sender, PrintPageEventArgs e)
{
Font myFont = new Font("Cambria", 10, FontStyle.Italic, GraphicsUnit.Point);
float lineHeight = myFont.GetHeight(e.Graphics) + 4;
float yLineTop = 1000;
int x = e.MarginBounds.Left;
int y = 25; //e.MarginBounds.Top;
e.Graphics.DrawImageUnscaled(list[pageIndex],
x,y);
pageIndex++;
e.HasMorePages = (pageIndex < list.Count);
e.Graphics.DrawString("Page No: " + pageIndex, myFont, Brushes.Black,
new PointF(e.MarginBounds.Right, yLineTop));
}
public void PrintDoc()
{
try
{
Panel grd = panel_;
Bitmap bmp = new Bitmap(grd.Width, grd.Height, grd.CreateGraphics());
grd.DrawToBitmap(bmp, new Rectangle(0, 0, grd.Width, grd.Height));
Image objImage = (Image)bmp;
Bitmap objBitmap = new Bitmap(objImage, new Size(700, objImage.Height));
Image PrintImage = (Image)objBitmap;
list = new List<Image>();
Graphics g = Graphics.FromImage(PrintImage);
Brush redBrush = new SolidBrush(Color.Red);
Pen pen = new Pen(redBrush, 3);
decimal xdivider = panel_.Width / 595m;
// int xdiv = Convert.ToInt32(Math.Ceiling(xdivider));
decimal ydivider = panel_.Height / 900m;
int ydiv = Convert.ToInt32(Math.Ceiling(ydivider));
int xdiv = panel_.Width / 595; //This is the xsize in pt (A4)
for (int i = 0; i < xdiv; i++)
{
for (int y = 0; y < ydiv; y++)
{
Rectangle r;
if (panel_.Height > 900)
{
try
{
if (list.Count > 0)
{
r = new Rectangle(0, (900 * list.Count), PrintImage.Width, PrintImage.Height - (900 * list.Count));
}
else
{
r = new Rectangle(0, 0, PrintImage.Width, 900);
}
list.Add(cropImage(PrintImage, r));
}
catch (Exception)
{
list.Add(PrintImage);
}
}
else { list.Add(PrintImage); }
}
}
g.Dispose();
PrintImage = list[0];
PrintDocument printDocument = new PrintDocument();
printDocument.PrintPage += printdoc1_PrintPage;
PrintPreviewDialog previewDialog = new PrintPreviewDialog();
previewDialog.Document = printDocument;
pageIndex = 0;
printDocument.DefaultPageSettings.PrinterSettings.PrintToFile = true;
string path = "d:\\BillIng.xps";
if (File.Exists(path))
File.Delete(path);
printDocument.DefaultPageSettings.PrinterSettings.PrintFileName = "d:\\BillIng.xps";
printDocument.PrintController = new StandardPrintController();
printDocument.Print();
printDocument.PrintPage -= printdoc1_PrintPage;
}
catch { }
}
private static Image cropImage(Image img, Rectangle cropArea)
{
Bitmap bmpImage = new Bitmap(img);
Bitmap bmpCrop = bmpImage.Clone(cropArea, System.Drawing.Imaging.PixelFormat.DontCare);
return (Image)(bmpCrop);
}
}
}