PDF-XChange Co Ltd :: Knowledge Base :: When I use the ‘y’ parameter to place images horizontally with the PXC_PlaceImage function, the parameter value is applied from the bottom of the page.

KB67
Dec 09, 2019 03:49 PM

When I use the ‘y’ parameter to place images horizontally with the PXC_PlaceImage function, the parameter value is applied from the bottom of the page.

Problem

When I use the ‘y’ parameter to place images horizontally with the PXC_PlaceImage function, the parameter value is applied from the bottom of the page. For example:

If the value is 0 -> then the image is not visible - its top is at the bottom of the page.
If the value is 150 -> then the top part of the image is visible at the bottom of the page,
If the value is equal to the page height then the image is shown at the top of the page.

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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When I use the ‘y’ parameter to place images horizontally with the PXC_PlaceImage function, the parameter value is applied from the bottom of the page.

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