DR0ID wrote:
get_length_sqrd just returns the length of a
vector which does not depend on the quadrant. Using atan2 might be
simpler
The get_angle() method *does* use atan2. The length check seems
to be just to avoid an exception if the vector happens to be (0, 0).
--
Greg
sam.hack...@sent.com wrote:
It has a get_angle() function, the first line of this checks if
length_sqrd() == 0, and then returns the angle as 0. This seems wrong to
me, if the vector is (1,-1), then length_sqrd (1**2 + -1**2) returns 0,
You're fooling yourself with operator precedence. If you
On 23.07.2011 14:23, sam.hack...@sent.com wrote:
Well, when I type "-1**2" into Python, it returns -1. If I run "1**2 +
-1**2" it returns 0. So, is there a bug in Python then? Running 2.6.6
on Ubuntu 10.10.
Removing the if statement from get_angle fixed the angle problem for
me, because of this
On 23.07.2011 14:26, sam.hack...@sent.com wrote:
Ah, I see the problem, it's doing -(1**2), you need to put "(-1)**2".
And, that's not a problem for the vector class, it's only because I
modified my copy a little. OK, nevermind then.
On Sat, 23 Jul 2011 13:23 +0100, sam.hack...@sent.com wrote:
Ah, I see the problem, it's doing -(1**2), you need to put
"(-1)**2". And, that's not a problem for the vector class, it's
only because I modified my copy a little. OK, nevermind then.
On Sat, 23 Jul 2011 13:23 +0100, sam.hack...@sent.com wrote:
Well, when I type "-1**2" into Python, it returns -
Well, when I type "-1**2" into Python, it returns -1. If I run
"1**2 + -1**2" it returns 0. So, is there a bug in Python then?
Running 2.6.6 on Ubuntu 10.10.
Removing the if statement from get_angle fixed the angle problem
for me, because of this.
On Sat, 23 Jul 2011 13:56 +0200, "DR0ID"
wrote:
On 23.07.2011 13:03, sam.hack...@sent.com wrote:
On the 2D vector page, http://pygame.org/wiki/2DVectorClass
It has a get_angle() function, the first line of this checks if
length_sqrd() == 0, and then returns the angle as 0. This seems wrong
to me, if the vector is (1,-1), then length_sqrd (1*
On the 2D vector page, http://pygame.org/wiki/2DVectorClass
It has a get_angle() function, the first line of this checks if
length_sqrd() == 0, and then returns the angle as 0. This seems
wrong to me, if the vector is (1,-1), then length_sqrd (1**2 +
-1**2) returns 0, and so the angle is returned
