From f837fb6f1d40087a3686d2e22c70e05be02e58f3 Mon Sep 17 00:00:00 2001
From: Daniel Drake <dsd@laptop.org>
Date: Sat, 30 Aug 2008 21:45:22 +0000
Subject: create a tool for adding resolute joints

---
diff --git a/bridge.py b/bridge.py
index 76daffc..6dac4c7 100644
--- a/bridge.py
+++ b/bridge.py
@@ -1,14 +1,23 @@
 import pygame
 
-def create_world(game):
-    rect = pygame.Rect((0,800), (350, -250))
-    rect.normalize()
-    pygame.draw.rect(game.screen, (100,180,255), rect, 3)
-    game.world.add.rect(rect.center, rect.width / 2, rect.height / 2,
-        dynamic=False)
-    rect = pygame.Rect((1200,800), (-350, -250))
-    rect.normalize()
-    pygame.draw.rect(game.screen, (100,180,255), rect, 3)
-    game.world.add.rect(rect.center, rect.width / 2, rect.height / 2,
-        dynamic=False)
+class Bridge:
+    def __init__(self, game):
+        self.game = game
+        self.screen = game.screen
+        self.world = game.world
+
+    def create_world(self):
+        rect = pygame.Rect((0,800), (350, -250))
+        rect.normalize()
+        pygame.draw.rect(self.screen, (100,180,255), rect, 3)
+        self.world.add.rect(rect.center, rect.width / 2, rect.height / 2,
+            dynamic=False)
+        rect = pygame.Rect((1200,800), (-350, -250))
+        rect.normalize()
+        pygame.draw.rect(self.screen, (100,180,255), rect, 3)
+        self.world.add.rect(rect.center, rect.width / 2, rect.height / 2,
+            dynamic=False)
+
+    def joint_added(self, joint):
+        print "joint added!"
 
diff --git a/physics.py b/physics.py
index 6d9fb78..b76db14 100644
--- a/physics.py
+++ b/physics.py
@@ -23,7 +23,7 @@ import olpcgames
 import elements
 from elements import Elements
 import tools
-import bridge
+from bridge import Bridge
 from helpers import *
 
 class PhysicsGame:
@@ -35,6 +35,7 @@ class PhysicsGame:
         self.canvas = olpcgames.ACTIVITY.canvas
         self.joystickobject = None 
         self.debug = True
+
         # create the name --> instance map for components
         self.toolList = {}
         for c in tools.allTools:
@@ -48,7 +49,8 @@ class PhysicsGame:
         # set up static environment
         self.world.add.ground()    
 
-        bridge.create_world(self)
+        self.bridge = Bridge(self)
+        self.bridge.create_world()
         
     def run(self):
         self.running = True    
diff --git a/tools.py b/tools.py
index 0ce23d9..1302d8c 100644
--- a/tools.py
+++ b/tools.py
@@ -4,6 +4,7 @@
 #                           By Alex Levenson
 #==================================================================
 import pygame
+from elements import box2d
 from pygame.locals import *
 from helpers import *
 from inspect import getmro
@@ -92,6 +93,9 @@ class Tool(object):
         # default cancel doesn't do anything
         pass
 
+    def to_b2vec(self, pt):
+        return self.game.world.add.to_b2vec(pt)
+
 # The circle creation tool        
 class CircleTool(Tool): 
     name = "circle"
@@ -430,6 +434,41 @@ class JoystickTool(Tool):
         self.vertices = None
 
 
+# The joint tool        
+class BridgeJointTool(Tool):
+    name = "bridgejoint"
+    icon = "joint"
+    toolTip = "Bridge Joint"
+    
+    def __init__(self,gameInstance):
+        self.game = gameInstance
+        self.name = "Bridge Joint"
+        self.jb1 = self.jb2 = self.jb1pos = self.jb2pos = None
+    def handleEvents(self,event):
+        #look for default events, and if none are handled then try the custom events 
+        if super(BridgeJointTool,self).handleEvents(event):
+            return
+        if event.type != MOUSEBUTTONUP or event.button != 1:
+            return
+
+        print "mouse button up"
+        bodies = self.game.world.get_bodies_at_pos(event.pos)
+        if not bodies or len(bodies) != 2:
+            return
+        
+        print bodies[0]
+        print bodies[1]
+        jointDef = box2d.b2RevoluteJointDef()
+        jointDef.Initialize(bodies[0], bodies[1], self.to_b2vec(event.pos))
+        joint = self.game.world.world.CreateJoint(jointDef)
+        self.game.bridge.joint_added(joint)
+
+    def draw(self):
+        return
+    
+    def cancel(self):
+        self.jb1 = self.jb2 = self.jb1pos = self.jb2pos = None  
+
 def getAllTools():
     this_mod = __import__(__name__)
     all = [val for val in this_mod.__dict__.values() if isinstance(val, type)]
--
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