From c378d236bbda3771310477c5e1965c4ba725a27f Mon Sep 17 00:00:00 2001
From: Erwin Coumans <erwin.coumans@gmail.com>
Date: Mon, 26 Dec 2016 22:31:41 -0800
Subject: [PATCH] make the event fields understandable

---
 examples/pybullet/vrEvent.py | 36 ++++++++++++++++++++----------------
 1 file changed, 20 insertions(+), 16 deletions(-)

diff --git a/examples/pybullet/vrEvent.py b/examples/pybullet/vrEvent.py
index 4112defd9..df80e461b 100644
--- a/examples/pybullet/vrEvent.py
+++ b/examples/pybullet/vrEvent.py
@@ -1,10 +1,14 @@
-#See pybullet quickstart guide here:
-#https://docs.google.com/document/d/10sXEhzFRSnvFcl3XxNGhnD4N2SedqwdAvK3dsihxVUA/edit#
-
+# See pybullet quickstart guide here:
+# https://docs.google.com/document/d/10sXEhzFRSnvFcl3XxNGhnD4N2SedqwdAvK3dsihxVUA/edit#
 # Create a Tiltbrush-like app, drawing lines using any controller
 # Line width can be changed
 
 import pybullet as p
+
+CONTROLLER_ID = 0
+POSITION=1
+BUTTONS=6
+
 #assume that the VR physics server is already started before
 p.connect(p.SHARED_MEMORY)
 p.setInternalSimFlags(0)#don't load default robot assets etc
@@ -27,27 +31,27 @@ while True:
 	events = p.getVREvents()
 
 	for e in (events):
-		if (e[6][33]&2):
-			prev[e[0]] = e[1]
-		if (e[6][32]&2):
-			widths[e[0]]=widths[e[0]]+1
-			if (widths[e[0]]>20):
-				widths[e[0]] = 1
-		if (e[6][1]&2):
+		if (e[BUTTONS][33]&2):
+			prev[e[CONTROLLER_ID]] = e[POSITION]
+		if (e[BUTTONS][32]&2):
+			widths[e[CONTROLLER_ID]]=widths[e[0]]+1
+			if (widths[e[CONTROLLER_ID]]>20):
+				widths[e[CONTROLLER_ID]] = 1
+		if (e[BUTTONS][1]&2):
 			p.resetSimulation()
 			#p.setGravity(0,0,-10)
 			p.removeAllUserDebugItems()
 			p.loadURDF("plane.urdf")
-		if (e[6][33]==1):
-			pt = prev[e[0]]
+		if (e[BUTTONS][33]==1):
+			pt = prev[e[CONTROLLER_ID]]
 			
 			#print(prev[e[0]])
 			#print(e[1])
-			diff = [pt[0]-e[1][0],pt[1]-e[1][1],pt[2]-e[1][2]]
+			diff = [pt[0]-e[POSITION][0],pt[1]-e[POSITION][1],pt[2]-e[POSITION][2]]
 			lenSqr =	diff[0]*diff[0]+diff[1]*diff[1]+diff[2]*diff[2]
 			ptDistThreshold = 0.01
 			if (lenSqr>(ptDistThreshold*ptDistThreshold)):
-				p.addUserDebugLine(e[1],prev[e[0]],colors[e[0]],widths[e[0]])
+				p.addUserDebugLine(e[POSITION],prev[e[CONTROLLER_ID]],colors[e[CONTROLLER_ID]],widths[e[CONTROLLER_ID]])
 				#p.loadURDF("cube_small.urdf",e[1])
-				colors[e[0]] = [1-colors[e[0]][0],1-colors[e[0]][1],1-colors[e[0]][2]]
-				prev[e[0]] = e[1]			
\ No newline at end of file
+				colors[e[CONTROLLER_ID]] = [1-colors[e[CONTROLLER_ID]][0],1-colors[e[CONTROLLER_ID]][1],1-colors[e[CONTROLLER_ID]][2]]
+				prev[e[CONTROLLER_ID]] = e[POSITION]			
\ No newline at end of file