add simulator class that has a list of trees

Projekt/Simulator.py

+import numpy as np
+import Tree
+import TreeSpecies as ts
+
+class Simulator:
+    trees = 0 # current status of all trees in the simulation
+    stepsize = 1 # the internal integration stepsize in years
+
+    def __init__(self, numTrees):
+        self.trees = np.empty(numTrees, Tree.Tree)
+        for i in range(numTrees):
+            species = ts.species[np.random.randint(0, 5)]
+            pos = np.random.random(2)
+            self.trees[i] = Tree.Tree(pos, species)
+
+    def advance(self, years):
+        """Advances the simulation by years amount of years.
+        Returns a copy of the current list of trees."""