Positive y is up and angles
Posted: Thu Jun 25, 2015 1:48 pm
Hi Eric
Something odd is happening to Angle on the Edit pallet when "positive y is up" is selected in the Preferences.
I draw a line from top to bottom – normally this would be 90º. With positive y is up, the angle shows as 270º.
I actually want my line to be at 35º to the vertical, so normally I make the angle 125º (90 + 35) in the Edit pallet and my line rotates 35º from the top end.
With positive y is up selected, it looks as if the angles are getting smaller as you rotate clockwise – so I enter 235º (270 - 35). But I get a line at 125º (that is at 35º to the vertical from bottom to top). And the angle shows as 125º in the Edit pallet, even though I entered 235º. To get what I want, I have to enter 125º and the Edit pallet then reads 235º and my line is at 35º.
With the same line – vertical from top to bottom - reading 270º -- if I enter 90º, nothing happens (I don't think the line reverses). Edit stays at 270º.
I don't know if this is a bug or I am failing to grasp the geometry here!
George
Something odd is happening to Angle on the Edit pallet when "positive y is up" is selected in the Preferences.
I draw a line from top to bottom – normally this would be 90º. With positive y is up, the angle shows as 270º.
I actually want my line to be at 35º to the vertical, so normally I make the angle 125º (90 + 35) in the Edit pallet and my line rotates 35º from the top end.
With positive y is up selected, it looks as if the angles are getting smaller as you rotate clockwise – so I enter 235º (270 - 35). But I get a line at 125º (that is at 35º to the vertical from bottom to top). And the angle shows as 125º in the Edit pallet, even though I entered 235º. To get what I want, I have to enter 125º and the Edit pallet then reads 235º and my line is at 35º.
With the same line – vertical from top to bottom - reading 270º -- if I enter 90º, nothing happens (I don't think the line reverses). Edit stays at 270º.
I don't know if this is a bug or I am failing to grasp the geometry here!
George