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pursuit: render agents as squares instead of circles #1399

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pursuit: render agents as squares instead of circles #1399

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03ae865
pursuit: render agents as squares instead of circles
Jul 13, 2026
9ebab00
Merge branch 'main' into pursuit-square-agents
jkterry1 Jul 20, 2026
7859fdf
Merge branch 'main' into pursuit-square-agents
jkterry1 Jul 22, 2026
37e4a47
Merge branch 'main' into pursuit-square-agents
jkterry1 Aug 1, 2026
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27 changes: 14 additions & 13 deletions pettingzoo/sisl/pursuit/pursuit_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -320,26 +320,27 @@ def draw_pursuers_observations(self):
),
)

def draw_agent_square(self, x, y, col):
# draw a square slightly smaller than the grid box, centered in the cell
size = int(self.pixel_scale * 0.8)
offset = (self.pixel_scale - size) // 2
rect = pygame.Rect(
int(self.pixel_scale * x) + offset,
int(self.pixel_scale * y) + offset,
size,
size,
)
pygame.draw.rect(self.screen, col, rect)

def draw_pursuers(self):
for i in range(self.pursuer_layer.n_agents()):
x, y = self.pursuer_layer.get_position(i)
center = (
int(self.pixel_scale * x + self.pixel_scale / 2),
int(self.pixel_scale * y + self.pixel_scale / 2),
)
col = (255, 0, 0)
pygame.draw.circle(self.screen, col, center, int(self.pixel_scale / 3))
self.draw_agent_square(x, y, (255, 0, 0))

def draw_evaders(self):
for i in range(self.evader_layer.n_agents()):
x, y = self.evader_layer.get_position(i)
center = (
int(self.pixel_scale * x + self.pixel_scale / 2),
int(self.pixel_scale * y + self.pixel_scale / 2),
)
col = (0, 0, 255)

pygame.draw.circle(self.screen, col, center, int(self.pixel_scale / 3))
self.draw_agent_square(x, y, (0, 0, 255))

def draw_agent_counts(self):
font = pygame.font.SysFont("Comic Sans MS", self.pixel_scale * 2 // 3)
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