Package: python-pygame Version: 1.8.1release-2+b1 Severity: normal Tags: upstream
There is an error in how circle collisions are calculated in pygame.sprite.collide_circle. It checks whether distance^2 < radius1^2 + radius2^2, where it should check whether distance^2 < (radius1 + radius2)^2. The effect is that sometimes clearly colliding rects/radii are not reported as colliding: >>> import pygame >>> class test: pass ... >>> a, b = test(), test() >>> a.rect = pygame.Rect >>> a.rect = pygame.Rect(0,0,10,10) >>> b.rect = pygame.Rect(8,8,10,10) >>> pygame.sprite.collide_circle(a,b) False >>> c, d = test(), test() >>> c.rect = pygame.Rect(0,0,10,10) >>> d.rect = pygame.Rect(8,0,10,10) >>> c.radius = d.radius = 5 >>> pygame.sprite.collide_circle(c,d) False I'm also a little bit worried: this kind of error should be caught by upstream regression/unit testing; don't pygame developers write tests for their code before shipping? -- Package-specific info: Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Description +++-=============================-=============================-========================================================================== un libsdl-dev <none> (no description available) ii libsdl-gfx1.2-4 2.0.20-1.1 drawing and graphical effects extension for SDL un libsdl-image-dev <none> (no description available) un libsdl-image1.0-dev <none> (no description available) un libsdl-image1.1-dev <none> (no description available) ii libsdl-image1.2 1.2.10-2+b2 image loading library for Simple DirectMedia Layer 1.2 un libsdl-image1.2-dev <none> (no description available) un libsdl-mixer-dev <none> (no description available) un libsdl-mixer1.0-dev <none> (no description available) un libsdl-mixer1.1-dev <none> (no description available) ii libsdl-mixer1.2 1.2.8-6.3 mixer library for Simple DirectMedia Layer 1.2 un libsdl-mixer1.2-dev <none> (no description available) ii libsdl-net1.2 1.2.7-2 network library for Simple DirectMedia Layer un libsdl-perl <none> (no description available) ii libsdl-sound1.2 1.0.3-3+b1 Decoder of several sound file formats for SDL ii libsdl-ttf2.0-0 2.0.9-1 ttf library for Simple DirectMedia Layer with FreeType 2 support un libsdl0.11 <none> (no description available) un libsdl0.11-dev <none> (no description available) un libsdl1.0-dev <none> (no description available) un libsdl1.1-dev <none> (no description available) un libsdl1.2 <none> (no description available) un libsdl1.2-all <none> (no description available) un libsdl1.2-arts <none> (no description available) un libsdl1.2-dev <none> (no description available) un libsdl1.2-esd <none> (no description available) un libsdl1.2-nas <none> (no description available) un libsdl1.2-oss <none> (no description available) ii libsdl1.2debian 1.2.14-6.1 Simple DirectMedia Layer un libsdl1.2debian-all <none> (no description available) ii libsdl1.2debian-alsa 1.2.14-6.1 Simple DirectMedia Layer (with X11 and ALSA options) un libsdl1.2debian-arts <none> (no description available) un libsdl1.2debian-esd <none> (no description available) un libsdl1.2debian-nas <none> (no description available) un libsdl1.2debian-oss <none> (no description available) un libsdl1.2debian-pulseaudio <none> (no description available) -- System Information: Debian Release: 6.0.5 APT prefers stable APT policy: (500, 'stable') Architecture: i386 (i686) Kernel: Linux 2.6.32-5-686 (SMP w/1 CPU core) Locale: LANG=fi_FI.UTF-8, LC_CTYPE=fi_FI.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages python-pygame depends on: ii libc6 2.11.3-3 Embedded GNU C Library: Shared lib ii libjpeg62 6b1-1 The Independent JPEG Group's JPEG ii libpng12-0 1.2.44-1+squeeze4 PNG library - runtime ii libsdl-image1.2 1.2.10-2+b2 image loading library for Simple D ii libsdl-mixer1.2 1.2.8-6.3 mixer library for Simple DirectMed ii libsdl-ttf2.0-0 2.0.9-1 ttf library for Simple DirectMedia ii libsdl1.2debian 1.2.14-6.1 Simple DirectMedia Layer ii libsmpeg0 0.4.5+cvs20030824-2.2 SDL MPEG Player Library - shared l ii libx11-6 2:1.3.3-4 X11 client-side library ii python 2.6.6-3+squeeze7 interactive high-level object-orie ii python-central 0.6.16+nmu1 register and build utility for Pyt ii python-numpy 1:1.4.1-5 Numerical Python adds a fast array ii ttf-freefont 20090104-7 Freefont Serif, Sans and Mono True python-pygame recommends no packages. python-pygame suggests no packages. -- no debconf information -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
