def draw():
ctx = Canvas(width=500, height=500, gtk_draw=True)
bg = ctx.background()
bg.fill_color = 0.2
ctx.add(bg)
## Update each flock.
global flocks
for flock in flocks:
flock.update(goal=60)
## Draw a grey arrow for each boid in a block.
## Radius and opacity depend on the boids z-position.
for boid in flock:
r = 10 + boid.z * 0.25
alpha = 0.5 + boid.z*0.01
s = shape()
arrow = s.arrow(boid.x-r/2, boid.y-r/2, r)
arrow.fill_color = (0.6, 0.6, 0.6, alpha)
arrow.rotate(-boid.angle)
ctx.add(arrow)
ctx.draw()
return ctx.gtk()
def draw():
global colony
ctx = Canvas(width=500, height=500, gtk_draw=True)
bg = ctx.background()
bg.fill_color = 0.2
ctx.add(bg)
## Draw the hoarded food in the colony.
shapes = shape()
s = colony.food
oval = shapes.oval(colony.x-s/2, colony.y-s/2, s, s)
oval.fill_color = (0.3)
ctx.add(oval)
## Draw each foodsource in green.
## Watch it shrink as the ants eat away its size parameter!
for f in colony.foodsources:
oval = shapes.oval(f.x-f.size/2, f.y-f.size/2, f.size, f.size)
oval.fill_color = (0.6, 0.8, 0, 0.1)
ctx.add(oval)
for ant in colony:
p = path()
## Draw the pheromone trail for each ant.
## Ants leave a trail of scent from the foodsource,
## enabling other ants to find the food as well!
if len(ant.trail) > 0:
p.moveto(ant.trail[0].x, ant.trail[0].y)
for k in ant.trail:
p.lineto(k.x, k.y)
p.stroke_color = (0.8, 0.8, 0.8, 1.0)
p.stroke_width = (0.5)
ctx.add(p)
## Change ant color when carrying food.
## The main ant behaviour:
## 1) follow an encountered trail,
## 2) harvest nearby food source,
## 3) bring food back to colony,
## 4) wander aimlessly
ant.forage()
oval = shapes.oval(ant.x, ant.y, 3, 3)
if ant.has_food:
oval.fill_color = (0.6, 0.8, 0)
else:
oval.fill_color = (0.8, 0.8, 0.8, 0.5)
ctx.add(oval)
ctx.draw()
return ctx.gtk()