From 75cf6c9dd1fa5aef18f11e08bcc3728c1175b1c4 Mon Sep 17 00:00:00 2001 From: Joe Wreschnig Date: Sat, 24 Apr 2010 01:23:48 -0700 Subject: [PATCH] Give bullets a radius by default. Use try/except rather than getattr during collision, as Bullet has all of those by default. Remove abs calls. --- bulletml/bulletyaml.py | 2 +- bulletml/collision.py | 32 ++++++++++++++++++++------------ bulletml/impl.py | 7 +++++-- 3 files changed, 26 insertions(+), 15 deletions(-) diff --git a/bulletml/bulletyaml.py b/bulletml/bulletyaml.py index 2503c9d..2ec2f08 100644 --- a/bulletml/bulletyaml.py +++ b/bulletml/bulletyaml.py @@ -30,7 +30,7 @@ def register(Loader=None, Dumper=None): parser.Repeat, parser.Accel, parser.BulletDef, parser.BulletRef, parser.ActionDef, parser.ActionRef, parser.FireDef, parser.FireRef, parser.Offset, - parser.BulletML]: + parser.Appearance, parser.If, parser.BulletML]: def add(cls, loader, dumper): """Register a class in a new variable scope.""" diff --git a/bulletml/collision.py b/bulletml/collision.py index 1683e58..8aa17d3 100644 --- a/bulletml/collision.py +++ b/bulletml/collision.py @@ -30,7 +30,10 @@ def overlaps(a, b): dx = a.x - b.x dy = a.y - b.y - radius = getattr(a, 'radius', 0.5) + getattr(b, 'radius', 0.5) + try: + radius = a.radius + b.radius + except AttributeError: + radius = getattr(a, 'radius', 0.5) + getattr(b, 'radius', 0.5) return dx * dx + dy * dy <= radius * radius @@ -53,27 +56,32 @@ def collides(a, b): yb = b.y # Treat b as a point, we only need one radius. - radius = getattr(a, 'radius', 0.5) + getattr(b, 'radius', 0.5) + try: + radius = a.radius + b.radius + except AttributeError: + radius = getattr(a, 'radius', 0.5) + getattr(b, 'radius', 0.5) # Previous frame locations. - pxa = getattr(a, 'px', xa) - pya = getattr(a, 'py', ya) - pxb = getattr(b, 'px', xb) - pyb = getattr(b, 'py', yb) + try: pxa = a.px + except KeyError: pxa = xa + try: pya = a.py + except KeyError: pya = ya + try: pxb = b.px + except KeyError: pxb = xb + try: pyb = b.py + except KeyError: pyb = yb # Translate b's final position to be relative to a's start. # And now, circle/line collision. dir_x = pxa + (xb - xa) - pxb dir_y = pya + (yb - ya) - pyb - if abs(dir_x) < 0.0001 and abs(dir_y) < 0.0001: - # b did not move relative to a, so do point/circle. - dx = pxb - pxa - dy = pyb - pya - return dx * dx + dy * dy < radius * radius - diff_x = pxa - pxb diff_y = pya - pyb + if (dir_x < 0.0001 and dir_x > -0.0001 + and dir_y < 0.0001 and dir_y > -0.0001): + # b did not move relative to a, so do point/circle. + return diff_x * diff_x + diff_y * diff_y < radius * radius # dot(diff, dir) / dot(dir, dir) t = (diff_x * dir_x + diff_y * dir_y) / (dir_x * dir_x + dir_y * dir_y) diff --git a/bulletml/impl.py b/bulletml/impl.py index f7edd5a..4785ef2 100644 --- a/bulletml/impl.py +++ b/bulletml/impl.py @@ -131,9 +131,10 @@ class Bullet(object): rank - game difficulty, 0 to 1, default 0.5 tags - string tags set by the running actions appearance - string used to set bullet appearance + radius - radius for collision Contructor Arguments: - x, y, direction, speed, target, rank, tags, appearance + x, y, direction, speed, target, rank, tags, appearance, radius - same as the above attributes actions - internal action list Action - custom Action constructor @@ -141,9 +142,11 @@ class Bullet(object): """ def __init__(self, x=0, y=0, direction=0, speed=0, target=None, - actions=(), rank=0.5, tags=(), appearance=None): + actions=(), rank=0.5, tags=(), appearance=None, + radius=0.5): self.x = self.px = x self.y = self.py = y + self.radius = radius self.mx = 0 self.my = 0 self.direction = direction -- 2.30.2