Differences

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--- summer_2018:vpython_tips [2021/06/24 15:17]
bott123 [Common Commands]
+++ summer_2018:vpython_tips [2021/06/24 16:03] (current)
pwirving
@@ Line 63: / Line 63: @@
 print(CD)  #This will print out the vector (-8, 9, -8)
 </code>
-  * **Graphing** - There are a few ways to graph in python, but a common method is via gcurve. If the values you wish to plot are changing over time in a loop, be sure to put the plot command in the loop with them, and plot each point for each iteration of the loop.
-<code>
-ExampleGraph = gcurve(color=color.green, label = 'Data Points')  #First, define the graph.
+  * **Graphing** - One method of graphing involves using physutil, which is a library that needs to be imported. From there, the syntax is similar to gcurve. MUST use GlowScript 2.9 or lower; anything higher will not import properly.
-ExampleGraph.plot([1,2],[3,4],[5,6])  #This will plot the three points listed, connected by a line.
-</code>
-Another method of graphing involves using physutil, which is a library that needs to be imported. From there, the syntax is similar to gcurve. MUST use GlowScript 2.9 or lower; anything higher will not import properly.
 <code>
 get_library('https://cdn.rawgit.com/PERLMSU/physutil/master/js/physutil.js')  #Imports physutil
-ball = sphere(pos=vector(0,0,0), radius=0.5, color=color.red)
+MassOfBall = 20
-ball.mass = 20
+SpeedOfBall = 10
-ball.speed = 10
 t=0
@@ Line 80: / Line 76: @@
 tf=10
-ExampleGraph2 = PhysGraph(numPlots = 1)
+ExampleGraph2 = PhysGraph(numPlots = 1)   #Defines graph window
 while t < tf:
-    KineticEnergy = 0.5*ball.mass*ball.speed**2
+    rate(50)
-    ExampleGraph2.plot(t, KineticEnergy)
-    ball.speed = ball.speed - 0.5
+    KineticEnergy = 0.5*MassOfBall*SpeedOfBall**2
+    ExampleGraph2.plot(t, KineticEnergy)   #Plot function is identical
+    SpeedOfBall = SpeedOfBall - 0.5
+    t = t+ dt
 </code>
   * **MotionMaps** - MotionMaps track an object and plant arrows in a trail behind the object. The size and direction of the arrows is controllable, so it can be a useful method to demonstrate any vector quantity of an object, such as velocity or Force. MUST use GlowScript 2.9 or lower; anything higher will not import properly.