There were two somewhat redundant flags for the axes: the position
(left, right, bottom) and the orientation (up-down, left-right, etc).
Replace the latter by an inverted flag: if true, the axis is
up-down or right-left, i.e. the opposite of what one would expect
for a normal graph.
Set the flag in the constructor and remove the setOrientation()
function.
Sadly, the code is a bit complex, because screen coordinates are
top-to-bottom. Who thought that would be a good idea?
Note: this also fixes the placement of the ticks of the time
axis.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2f9c0c04b5