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--- buzz_examples [2016/09/02 13:34] – [Square Pattern Formation] ilpincy
+++ buzz_examples [2018/03/18 22:58] (current) – root
@@ Line 1: / Line 1: @@
 ====== Buzz Example Gallery ======
-===== Generic examples ======
+===== Calculation of a Distance Gradient =====
-==== Calculation of a Distance Gradient ====
 The aim of this code is to have a group of robots form a distance gradient from a source.
@@ Line 42: / Line 40: @@
 </code>
-==== Hexagonal Pattern Formation ====
+===== Hexagonal Pattern Formation =====
 Hexagonal patterns can be formed in a simple way by mimicking particle interaction. A simple model of particle interaction is the [[https://en.wikipedia.org/wiki/Lennard-Jones_potential|Lennard-Jones potential]], which we use in the following code in a slightly modified way. Instead of the big exponents (12 and 6), we use the exponents 4 and 2, which give us smaller but more manageable numbers.
@@ Line 77: / Line 75: @@
   var accum = neighbors.map(lj_vector).reduce(lj_sum, math.vec2.new(0.0, 0.0))
   if(neighbors.count() > 0)
-    math.vec2.scale(accum, neighbors.count())
+    math.vec2.scale(accum, 1.0 / neighbors.count())
   # Move according to vector
   goto(accum.x, accum.y)
@@ Line 96: / Line 94: @@
 </code>
-==== Square Pattern Formation ====
+===== Square Pattern Formation =====
-To form square lattice, we can build upon the previous example. The insight is to notice that, in a square lattice, we can color the nodes forming the lattice with two shades, e.g., red and blue, and then mimic the [[http://www.metafysica.nl/turing/nacl_complex_motif_4.gif|crystal structure of kitchen salt]]. In this structure, if two nodes have different colors, they stay at a distance *D*; if they have the same color, they stay at a distance D*sqrt(2).
+To form square lattice, we can build upon the previous example. The insight is to notice that, in a square lattice, we can color the nodes forming the lattice with two shades, e.g., red and blue, and then mimic the [[http://www.metafysica.nl/turing/nacl_complex_motif_4.gif|crystal structure of kitchen salt]]. In this structure, if two nodes have different colors, they stay at a distance //D//; if they have the same color, they stay at a distance //D// * sqrt(2).
-With this idea in mind, the following script divided the robots in two swarms: those with an even id and those with an odd id. Then, using ''neighbors.kin()'' and ''neighbors.nonkin()'', the robots can distinguish which distance to pick and calculate the correct interaction vector.
+With this idea in mind, the following script divides the robots in two swarms: those with an even id and those with an odd id. Then, using ''neighbors.kin()'' and ''neighbors.nonkin()'', the robots can distinguish which distance to pick and calculate the correct interaction vector.
-<code buzz hexagon.bzz>
+<code buzz square.bzz>
 # We need this for 2D vectors
 # Make sure you pass the correct include path to "bzzc -I <path1:path2> ..."
@@ Line 139: / Line 137: @@
   accum = neighbors.nonkin().map(lj_vector_nonkin).reduce(lj_sum, accum)
   if(neighbors.count() > 0)
-    math.vec2.scale(accum, neighbors.count())
+    math.vec2.scale(accum, 1.0 / neighbors.count())
   # Move according to vector
   goto(accum.x, accum.y)
@@ Line 162: / Line 160: @@
 }
 </code>
-===== Wheeled-robot Specific =====
-TODO
-===== Flying-robot Specific =====
-TODO