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Hier werden die Unterschiede zwischen zwei Versionen gezeigt.

--- ws1819:programmcode [2019/03/04 11:26]
lennox99
+++ ws1819:programmcode [2019/03/05 17:32] (aktuell)
mana16 [Code]
@@ Zeile 1: / Zeile 1: @@
-====== Code ======
+{{https://i.ibb.co/48VrRGH/Code.png}}
+===== Main.py: =====
 <code python>
@@ Zeile 82: / Zeile 84: @@
 world.start(end_time)
+</code>
+\\
+\\
+=====physics_leapfrog.py:=====
+<code python>
+# -*- coding: utf-8 -*-
+from physics import PhysicsEngine
+from itertools import combinations
+import numpy as np
+class PhysicsEngineLeap(PhysicsEngine):
+    dt = None
+    def __init__(self, world, dt):
+        super(PhysicsEngineLeap, self).__init__(world)
+        self.dt = dt
+    def calc_acceleration(self, wo):
+        return wo.force / wo.mass
+    def step(self):
+        world_objects = self.world.world_objects.values()
+        #reset force
+        for wo in world_objects:
+            wo.force = np.array([0.0,0.0,0.0])
+        pairs = combinations(world_objects, 2)
+        #force-loop
+        for wo1, wo2 in pairs:
+            force = self.grav_force(wo1.position, wo2.position, wo1.mass, wo2.mass)
+            wo1.force += force
+            wo2.force -= force
+        #first velocity-loop
+        for wo in world_objects:
+            wo.velocity += self.calc_acceleration(wo) * self.dt / 2
+        #position-loop
+        for wo in world_objects:
+            wo.position += wo.velocity * self.dt
+        for wo in world_objects:
+            wo.force = np.array([0.0,0.0,0.0])
+        pairs = combinations(world_objects, 2)
+        #force-loop
+        for wo1, wo2 in pairs:
+            force = self.grav_force(wo1.position, wo2.position, wo1.mass, wo2.mass)
+            wo1.force += force
+            wo2.force -= force
+        #second velocity-loop:
+        for wo in world_objects:
+            wo.velocity += self.calc_acceleration(wo) * self.dt / 2
+        self.world.time += self.dt
 </code>

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