Where is the option to change/reverse the direction of the -negative axis?

Soggy Socks shared this question 2 years ago
Answered

Instead of Y negative going down, I need it go up. This is the way the coordinate system works with game development because the point of reference for everything point (0,0) which is at the top left corner of the screen. So every object moving down is going positive (value increasing) and objects moving up are negative (decreasing). The x axis is normal. Increasing values move right.


I can't find the setting for this on Geogebra. I'm using the Windows Store app "Geogebra Geometry" not the classic version.


Thanks!

Comments (3)

photo
2

This option isn't implemented in GeoGebra.If you want to display things this way, you'll have to hide the GG-y-axis and create one yourself, including the transformation of all objects.

chris

photo
1

OK, I understand. By creating one myself, does that just mean drawing the grid and making it a background? How do I go about your suggestion?

photo
1

The grid you can leave as it is, Since the axes have arrows, you'd better hide them (or at least the y-axis) and draw new ones in the desired direction by creating vectors.

For the numbers on the y-axis you can use command Text( <Object>, <Point> ) in a sequence.

But of course this is just how it looks and doesn't mirror the objects about the x-as, since that's the obvious transformation to adapt all objects to the 'new' axes'. See example added

chris

Files: axes.ggb
© 2020 International GeoGebra Institute