[Pkg] The Trunk: Graphics-nice.86.mcz
commits at source.squeak.org
commits at source.squeak.org
Sat Oct 31 02:14:22 UTC 2009
Nicolas Cellier uploaded a new version of Graphics to project The Trunk:
http://source.squeak.org/trunk/Graphics-nice.86.mcz
==================== Summary ====================
Name: Graphics-nice.86
Author: nice
Time: 31 October 2009, 3:13:31 am
UUID: 67835c13-ecca-4ff8-8635-e8f15d789607
Ancestors: Graphics-nice.85
while at arcTan: fix 2 ULP in Float theta
Note that Float theta is in [0,2*pi[ while arcTan: is in [-pi,pi]
(0 at 0) theta leads to pi/2 instead of 0 for new version of arcTan: (pi for old version)
#arcTan: does handle case of negativeZero, #theta doesn't
=============== Diff against Graphics-nice.85 ===============
Item was changed:
----- Method: Point>>theta (in category 'polar coordinates') -----
theta
"Answer the angle the receiver makes with origin in radians. right is 0;
down is 90.
Corrected the constants from single precision to 64 Bit precision
and changed the sends in case of overflow to constants HK 2005-07-23"
| tan theta |
x = 0
ifTrue: [y >= 0
+ ifTrue: [^ 1.5707963267948966 "90.0 degreesToRadians"]
- ifTrue: [^ 1.570796326794897 "90.0 degreesToRadians"]
ifFalse: [^ 4.71238898038469 "270.0 degreesToRadians"]]
ifFalse:
[tan := y asFloat / x asFloat.
theta := tan arcTan.
x >= 0
ifTrue: [y >= 0
ifTrue: [^theta]
ifFalse: [^"360.0 degreesToRadians" 6.283185307179586 + theta]]
ifFalse: [^"180.0 degreesToRadians" 3.141592653589793 + theta]]!
More information about the Packages
mailing list