PDF-XChange Co Ltd :: Knowledge Base :: When I use PXC_SetPageBox to save PB_CropBox values and then read it with PXC_GetPageBox, the bottom and top values are interchanged.

KB66
Dec 09, 2019 03:47 PM

When I use PXC_SetPageBox to save PB_CropBox values and then read it with PXC_GetPageBox, the bottom and top values are interchanged.

Problem

When I use PXC_SetPageBox to save PB_CropBox values and then read it with PXC_GetPageBox, the bottom and top values are interchanged.

For example, if a value of 50 is saved as the top value and a value of 700 is saved for the bottom value, then PXC_GetPageBox subsequently reads the values as 700 for the top value and 50 for the bottom value.

Answer

This is the manner in which the software is meant to operate. Please note:

The 'y' coordinates in PDF operate from bottom to top, which means that in rect the top is always greater than the bottom.
The top-left corner of images that is specified when images are placed.
Image dimensions are given in coordinates, as opposed to pixels.
Images take full rect, regardless of their size.

Please see the 2.3.1 Coordinate system in the PDF-Tools 4 SDK help file (page 61) for further information.

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Knowledgebase

When I use PXC_SetPageBox to save PB_CropBox values and then read it with PXC_GetPageBox, the bottom and top values are interchanged.

Problem

Answer

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