Help with DrawImageMatrix
Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=2228
Printed Date: 10 May 25 at 10:21PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com
Topic: Help with DrawImageMatrix
Posted By: kaiken1987
Subject: Help with DrawImageMatrix
Date Posted: 12 Apr 12 at 7:34PM
I'm trying to use DrawImageMatrix but I can't get the image to display.
I assume that the parameters work so that
x' = x*m11+y*m12+mdx
y' = x*m21+y*m22+mdy
so if run with DrawImageMatrix(1,0,0,1,0,0) is should draw at the origin at its original size and orientation however nothing shows up in the output pdf. If I do a normal DrawImage it displays fine and DrawImageMatrix returns no error.
example code
QP->NewDocument();
QP->SetPageDimensions(3900,2400);
QP->SelectPage(1);
QP->SetOrigin(1);
QP->AddImageFromFile(L"test.tif",0);
QP->DrawImageMatrix(1,0,0,1,0,0);
QP->SaveToFile(L"Test.pdf");
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Replies:
Posted By: AndrewC
Date Posted: 13 Apr 12 at 11:57AM
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The last two parameters are x,y so experiment with those first... The image will be scaled to 1pt x 1pt so increase the 1 values to width and height values.
QP.DrawImageMatrix(100, 0, 0, 100, 300, 300);
Here is some code that generates an interesting pattern. This code is not mine so I cannot tell you how the parameters were created.
QP.CompressImages(1); int ImageID = QP.AddImageFromFile("aldi.bmp", 0); QP.SelectPage(1); QP.SelectImage(ImageID);
QP.DrawImageMatrix(100, 0, 0, 100, 300, 300);
QP.DrawImageMatrix(152.44, 60.9762, -1.53974, 72.7334, 55.8672, 543); QP.DrawImageMatrix(151.872, 63.3877, -124.567, 98.8179, 179.203, 443.602); QP.DrawImageMatrix(154.612, 63.9774, -125.495, 75.8196, 179.204, 540.918); QP.DrawImageMatrix(153.172, 63.6644, 0, 98.6157, 178.163, 444.123);
QP.SaveToFile("out.pdf"); Process.Start(@"out.pdf");
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Posted By: fellafoo
Date Posted: 23 May 22 at 4:51PM
In the Adobe PDF Reference, search for Common Transformations.It's in section 8.3.3 of the PDF 1.7 document: https://opensource.adobe.com/dc-acrobat-sdk-docs/standards/pdfstandards/pdf/PDF32000_2008.pdf" rel="nofollow - https://opensource.adobe.com/dc-acrobat-sdk-docs/standards/pdfstandards/pdf/PDF32000_2008.pdf
For example:
SetMeasurementUnits(0); Note: I've gotten unexpected results using millimeters or inches.
For Translation (Move X / Move Y from Origin (Left, Bottom))... DrawImageMatrix(ImageWidth * 1, 0, 0, ImageHeight * 1, MoveX, MoveY)
For Scaling (Enlarge X / Enlarge Y)... DrawImageMatrix(ImageWidth * Enlargement, 0, 0, ImageHeight * Enlargement, 0, 0)
For Rotations (Counter-clockwise Angle around origin)... DrawImageMatrix(ImageWidth * Cos(Angle * Pi / 180), ImageWidth * Sin(Angle * Pi / 180), ImageHeight * - Sin(Angle * Pi / 180), ImageHeight * Cos(Angle * Pi / 180), 0, 0)
For Skew (ImageWidth * 1, Tan(AngleX * Pi / 180), Tan(AngleY * Pi / 180), ImageHeight * 1, 0, 0)
FWIW,
MFM
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Posted By: Ingo
Date Posted: 23 May 22 at 8:26PM
Hi :)
you should have a look at:
SetOrigin:
https://www.debenu.com/docs/pdf_library_reference/SetOrigin.php
SetGlobalOrigin:
https://www.debenu.com/docs/pdf_library_reference/SetGlobalOrigin.php
SetMeasurementUnits:
https://www.debenu.com/docs/pdf_library_reference/SetMeasurementUnits.php
SetGlobalMeasurementUnits:
https://www.debenu.com/docs/pdf_library_reference/SetGlobalMeasurementUnits.php
This are functions from the measurement and coordinate unit:
https://www.debenu.com/docs/pdf_library_reference/SetGlobalMeasurementUnits.php
Think there you'll find a solution for your issues...
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Cheers,
Ingo
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