1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
"""The Pong Game."""
import sys
import sdl2
import sdl2.ext
BLACK = sdl2.ext.Color(0, 0, 0)
WHITE = sdl2.ext.Color(255, 255, 255)
PADDLE_SPEED = 3
BALL_SPEED = 3
class CollisionSystem(sdl2.ext.Applicator):
def __init__(self, minx, miny, maxx, maxy):
super(CollisionSystem, self).__init__()
self.componenttypes = Velocity, sdl2.ext.Sprite
self.ball = None
self.minx = minx
self.miny = miny
self.maxx = maxx
self.maxy = maxy
def _overlap(self, item):
sprite = item[1]
if sprite == self.ball.sprite:
return False
left, top, right, bottom = sprite.area
bleft, btop, bright, bbottom = self.ball.sprite.area
return (bleft < right and bright > left and
btop < bottom and bbottom > top)
def process(self, world, componentsets):
collitems = [comp for comp in componentsets if self._overlap(comp)]
if len(collitems) != 0:
self.ball.velocity.vx = -self.ball.velocity.vx
sprite = collitems[0][1]
ballcentery = self.ball.sprite.y + self.ball.sprite.size[1] // 2
halfheight = sprite.size[1] // 2
stepsize = halfheight // 10
degrees = 0.7
paddlecentery = sprite.y + halfheight
if ballcentery < paddlecentery:
factor = (paddlecentery - ballcentery) // stepsize
self.ball.velocity.vy = -int(round(factor * degrees))
elif ballcentery > paddlecentery:
factor = (ballcentery - paddlecentery) // stepsize
self.ball.velocity.vy = int(round(factor * degrees))
else:
self.ball.velocity.vy = -self.ball.velocity.vy
if (self.ball.sprite.y <= self.miny or
self.ball.sprite.y + self.ball.sprite.size[1] >= self.maxy):
self.ball.velocity.vy = -self.ball.velocity.vy
if (self.ball.sprite.x <= self.minx or
self.ball.sprite.x + self.ball.sprite.size[0] >= self.maxx):
self.ball.velocity.vx = -self.ball.velocity.vx
class MovementSystem(sdl2.ext.Applicator):
def __init__(self, minx, miny, maxx, maxy):
super(MovementSystem, self).__init__()
self.componenttypes = Velocity, sdl2.ext.Sprite
self.minx = minx
self.miny = miny
self.maxx = maxx
self.maxy = maxy
def process(self, world, componentsets):
for velocity, sprite in componentsets:
swidth, sheight = sprite.size
sprite.x += velocity.vx
sprite.y += velocity.vy
sprite.x = max(self.minx, sprite.x)
sprite.y = max(self.miny, sprite.y)
pmaxx = sprite.x + swidth
pmaxy = sprite.y + sheight
if pmaxx > self.maxx:
sprite.x = self.maxx - swidth
if pmaxy > self.maxy:
sprite.y = self.maxy - sheight
class TrackingAIController(sdl2.ext.Applicator):
def __init__(self, miny, maxy):
super(TrackingAIController, self).__init__()
self.componenttypes = PlayerData, Velocity, sdl2.ext.Sprite
self.miny = miny
self.maxy = maxy
self.ball = None
def process(self, world, componentsets):
for pdata, vel, sprite in componentsets:
if not pdata.ai:
continue
sheight = sprite.size[1]
centery = sprite.y + sheight // 2
if self.ball.velocity.vx < 0:
# ball is moving away from the AI
if centery < self.maxy // 2 - PADDLE_SPEED:
vel.vy = PADDLE_SPEED
elif centery > self.maxy // 2 + PADDLE_SPEED:
vel.vy = -PADDLE_SPEED
else:
vel.vy = 0
else:
bcentery = self.ball.sprite.y + self.ball.sprite.size[1] // 2
if bcentery < centery:
vel.vy = -PADDLE_SPEED
elif bcentery > centery:
vel.vy = PADDLE_SPEED
else:
vel.vy = 0
class SoftwareRenderSystem(sdl2.ext.SoftwareSpriteRenderSystem):
def __init__(self, window):
super(SoftwareRenderSystem, self).__init__(window)
def render(self, components):
sdl2.ext.fill(self.surface, BLACK)
super(SoftwareRenderSystem, self).render(components)
class TextureRenderSystem(sdl2.ext.TextureSpriteRenderSystem):
def __init__(self, renderer):
super(TextureRenderSystem, self).__init__(renderer)
self.renderer = renderer
def render(self, components):
tmp = self.renderer.color
self.renderer.color = BLACK
self.renderer.clear()
self.renderer.color = tmp
super(TextureRenderSystem, self).render(components)
class Velocity(object):
def __init__(self):
super(Velocity, self).__init__()
self.vx = 0
self.vy = 0
class PlayerData(object):
def __init__(self):
super(PlayerData, self).__init__()
self.ai = False
self.points = 0
class Player(sdl2.ext.Entity):
def __init__(self, world, sprite, posx=0, posy=0, ai=False):
self.sprite = sprite
self.sprite.position = posx, posy
self.velocity = Velocity()
self.playerdata = PlayerData()
self.playerdata.ai = ai
class Ball(sdl2.ext.Entity):
def __init__(self, world, sprite, posx=0, posy=0):
self.sprite = sprite
self.sprite.position = posx, posy
self.velocity = Velocity()
def run():
sdl2.ext.init()
window = sdl2.ext.Window("The Pong Game", size=(800, 600))
window.show()
if "-hardware" in sys.argv:
print("Using hardware acceleration")
renderer = sdl2.ext.Renderer(window)
factory = sdl2.ext.SpriteFactory(sdl2.ext.TEXTURE, renderer=renderer)
else:
print("Using software rendering")
factory = sdl2.ext.SpriteFactory(sdl2.ext.SOFTWARE)
# Create the paddles - we want white ones. To keep it easy enough for us,
# we create a set of surfaces that can be used for Texture- and
# Software-based sprites.
sp_paddle1 = factory.from_color(WHITE, size=(20, 100))
sp_paddle2 = factory.from_color(WHITE, size=(20, 100))
sp_ball = factory.from_color(WHITE, size=(20, 20))
world = sdl2.ext.World()
movement = MovementSystem(0, 0, 800, 600)
collision = CollisionSystem(0, 0, 800, 600)
aicontroller = TrackingAIController(0, 600)
if factory.sprite_type == sdl2.ext.SOFTWARE:
spriterenderer = SoftwareRenderSystem(window)
else:
spriterenderer = TextureRenderSystem(renderer)
world.add_system(aicontroller)
world.add_system(movement)
world.add_system(collision)
world.add_system(spriterenderer)
player1 = Player(world, sp_paddle1, 0, 250)
player2 = Player(world, sp_paddle2, 780, 250, True)
ball = Ball(world, sp_ball, 390, 290)
ball.velocity.vx = -BALL_SPEED
collision.ball = ball
aicontroller.ball = ball
running = True
while running:
for event in sdl2.ext.get_events():
if event.type == sdl2.SDL_QUIT:
running = False
break
if event.type == sdl2.SDL_KEYDOWN:
if event.key.keysym.sym == sdl2.SDLK_UP:
player1.velocity.vy = -PADDLE_SPEED
elif event.key.keysym.sym == sdl2.SDLK_DOWN:
player1.velocity.vy = PADDLE_SPEED
elif event.type == sdl2.SDL_KEYUP:
if event.key.keysym.sym in (sdl2.SDLK_UP, sdl2.SDLK_DOWN):
player1.velocity.vy = 0
sdl2.SDL_Delay(10)
world.process()
if __name__ == "__main__":
sys.exit(run())
|
