EpdSetOrientation()

Syntax

EpdSetOrientation(bOrientation As bEpdOrientation)

Parameters

bOrientation — Virtual orientation

0 = 0 degrees

1 = 90 degrees

2 = 180 degrees

3 = 270 degrees

Sets the current virtual orientation, relative to the panel's actual physical hardware orientation.

Unlike a TFT display, there's no hardware register on the EPD driver IC to set orientation directly (on a TFT controller, this is typically the MADCTL register) — bOrientation here is purely a software marker the library uses internally to determine how and in what order pixels get written.

The virtual origin — regardless of the currently set orientation — is always the bottom-left corner, with coordinates increasing left-to-right and bottom-to-top.
Think of it as if the EPD panel itself were being rotated: (0,0) is always the bottom-left corner from the software's point of view, no matter which physical orientation is selected.

Note: calling EpdSetOrientation() does not rotate content that has already been written to the display memory.
The library changes only the coordinate mapping used by subsequent drawing calls; a full refresh does not regenerate or rotate the existing image.
To obtain a rotated result, change the orientation and redraw the required image, text, or shapes.

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