NodeBox

Ariel

Another example of Boids in NodeBox, this one visualising the flight path of a flock of birds, registering where they where and where they are going. The boids tend to swarm around the center of the composition, like they're trapped in a cage.

Source code:

size(800, 600)
 
cornu = ximport("cornu")
boids = ximport("boids")
 
flock = boids.flock(10, 0, 0, WIDTH, HEIGHT)
flock.goal(WIDTH/2, HEIGHT/2, 0)
 
n = 30
for i in range(n):
    
    flock.update(shuffled=False)
 
    points = []
    nofill()
    for boid in flock:
        
        stroke(0.1,0.0,0.25, 2.5*boid.z/100)
        strokewidth(0.25*boid.z/100)
        
        r = boid.z/5
        oval(boid.x-r/2, boid.y-r/2, r, r)
        beginpath(boid.x, boid.y)
        curveto(
            boid.y, 
            boid.x, 
            boid.y, 
            boid.y, 
            WIDTH/2, 
            HEIGHT/2
        )
        endpath()
        
        push()
        rotate(-boid.angle)
        arrow(boid.x, boid.y, boid.z*0.2)
        pop()
        points.append((boid.x, boid.y))
        
    # Relativise points for Cornu.
    for i in range(len(points)):
        x, y = points[i]
        x /= 1.0 * WIDTH
        y /= 1.0 * HEIGHT
        points[i] = (x,y)
        
    stroke(0.1, 0.0, 0.25, 1.5 * float(i)/n)
    strokewidth(0.25)        
    cornu.drawpath(points, tweaks=0)

Created by Tom De Smedt