Draws a vertical line onto the bitmap.


void vline(BITMAP *bmp, int x, int y1, int y2, int color);
Draws a vertical line onto the bitmap, from point (x, y1) to (x, y2).

Note: vline() is implemented as an alias to another function. See ALLEGRO_NO_VHLINE_ALIAS in the `Differences between platforms' section for details.
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