Rank: Newbie
Groups: Member
Joined: 7/15/2015
Posts: 1
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Hi, I need to make sure that all images are scaled to the size of a letter--8.5/11 inches--and, while auto-scaling works for some images, it does not work for all images. One set of images is too detailed, and is appearing zoomed in on the page.
The instructions say that to optionally scale the image, you must use the "Pdfmatrix"...but I cannot expose the pdfmatrix from pdfImageContent. How does one limit or force the image to fill an 8.5 by 11 inch page, in the format of the example code for image manipulation in the documentation?
The current code is:
PdfPage page = pdfDocument.Pages.Add();
System.Drawing.Image image;
EO.Pdf.Drawing.PdfImage pdfImage;
EO.Pdf.Contents.PdfImageContent content;
using (MemoryStream ms = new MemoryStream(buffer))
{
image = System.Drawing.Image.FromStream(ms);
pdfImage = new EO.Pdf.Drawing.PdfImage(image);
content = new EO.Pdf.Contents.PdfImageContent(pdfImage);
}
content.AutoScale();
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,229
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Hi, Below is the source code of AutoScale:
Code: C#
public void AutoScale()
{
PdfMatrix matrix = PdfMatrix.NewIdentity();
if (m_Image != null)
{
System.Drawing.Image image = m_Image.Image;
float dpiX = image.HorizontalResolution;
float dpiY = image.VerticalResolution;
//Here we assume user space is 1/72 inch.
//This can change if user has set the
//transform matrix, in that case user will
//have to manually adjust this content's
//matrix accordingly
float scaleX = image.Width / dpiX * 72;
float scaleY = image.Height / dpiX * 72;
matrix.Scale(scaleX, scaleY);
}
this.GfxMatrix.Multiply(matrix);
}
Here m_Image is the PdfImage object. Hope this helps you understand how to scale the image. Thanks
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