By default, a PDF's document origin is at the bottom left of the page.  You can change this using the QuickPDF Library.  See the "Set Origin" method.  If, for example, you want to set the origin to top left then the method would be QP.SetOrigin(1).  Now when you use Drawing commands it starts at the top left instead of the bottom left of the document.

 

Tom

 

1) DrawImage

I was reading up on the DrawImage method which reads

 

function TQuickPDF0717.DrawImage(Left, Top, Width, 
  Height: Double): Integer;

 

 and try the following line

 

QP.DrawImage(0,0,lWidth,IHeight);

 

It however does not draw anything but blank pages.

I found the Delphi_DCU_Convert_Image_to_PDF example and found the implementation as

 

 

and that did the trick as the image filled the whole page.

 

I am actually confused here, shouldn't the 'Top' parameter refers to the top most pixel in which to place the image and not the bottom most pixel to place the image.

 

Is there an error to the component implementation or the documentation in wrong in this or I am just misinterpreting this.

 

2) Memory Issue

The second issue I have is that I would need to add some 200 odd images to a single PDF file and for my test of about 180 jpeg images, the memory usage keeps ballooning each time I add an image. Is there a way to get the library to write to file midway,  I did use the 'SetTempFile' and 'SetTempPath' but it looks like they were not being used. With 180 images, it seems to work fine as the memory usage for the program was about 600mb.

However when I added some 500 images, when it hits about 1.8gb memory usage, it stopped accepting images and reject them. Also the PDF file generated was about 6kb which was apparently in error.  Is there anything I can do to prevent this from happening ?

 

Sorry but I am new to this library. However, I must say that it is quite fast in adding the images. Overall the output looks good when it worked.