如何在多页中打印一张大图像? [英] How to print one large image in many pages?
问题描述
我想在多页中打印一张高(长)图像.因此,在每一页中,我都会从图像中取出合适的部分并将其绘制在页面中.
I want to print one tall (long) image in many pages. So in every page, I take a suitable part from the image and I draw it in the page.
问题是我在页面中缩小了图像(它的形状被压缩了),所以我添加了一个比例尺,其值为 1500 .我认为如果我知道页面(e.Graphics)的高度(以像素为单位),我就可以解决问题.要将英寸转换为像素,我是否必须乘以 (e.Graphics.DpiX = 600) 或乘以 96 .
the problem is that I have got the image shrunk (its shape is compressed) in the page,so I added an scale that its value is 1500 . I think that I can solve the problem if I knew the height of the page (e.Graphics) in pixels. to convert Inches to Pixel, Do I have to multiply by (e.Graphics.DpiX = 600) or multiply by 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);
}
你能不能让它正常工作.
could you please make it works correctly.
您可以从(此处).
提前致谢.
推荐答案
我试图完成你的任务.干得好.希望有帮助.
I tried to complete your task. Here you go. Hope it helps.
此方法将图像打印在多页(如果图像较小,则为一页).
This method prints the image on several pages (or one if image is small).
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:
This method prints every picture in the List in the needed dimensions (A4 size):
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:
This method crops the image and returns every part of the image:
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);
}
图像是从图片框加载的,因此请确保图像已加载.(还没有异常处理).
The Image gets loaded from the PictureBox, so make sure the image is loaded. (No exception handling yet).
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.
These variables are defined as global variables.
您可以在此处下载示例项目:
You can download a sample project here:
http://www.abouchleih.de/projects/PrintImage_multiplePages.zip//旧版本http://www.abouchleih.de/projects/PrintImage_multiplePages_v2.zip//新
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