1. By JerryDean Smith Chad Adams Karl Mullner

2.  The rectangle needs to be a ogre.ManualObject -this is done to create the rectangle and gives it special functions that will be used later for the selection of the entities  NOTE: The selection rectangle is always on top of all other objects in the render window

3.  Methods inside of Selection Rectangle Class  def __init__(self,name):  def drawBox(self, left, top, right, bottom):

4.  The selection rectangle initialization method has to setup the Render Queue Group and how the rectangle will be viewed  ogre.ManualObject.__init__(self,name)  self.setRenderQueueGroup(ogre.RenderQueue GroupID.RENDER_QUEUE_OVERLAY)  self.setUseIdentityProjection(True)  self.setUseIdentityView(True)  self.setQueryFlags(0)

5.  The drawBox does a little more than what it says it has to convert the mouse position to be able to hand the center of screen being 0,0 where normally it would be.5,.5  left = left * 2 - 1  right = right * 2 - 1  top = 1 - top * 2  bottom = 1 - bottom * 2

6.  Then it clears the old rectangle and shows the box. To do this simply type self.clear()  Begin sets up the material and type of shape drawn self.begin("", ogre.RenderOperation.OT_LINE_STRIP) It is important to remember that you need five points when drawing a box you must connect the box back to the beginning  self.position(left, top, -1)  self.position(right, top, -1)  self.position(right, bottom, -1)  self.position(left, bottom, -1)  self.position(left, top, -1)  self.end()

7.  In the intermediate tutorial we were told to put this into the the end of our drawBox  ## set the bounding box of the object to be infinite, so that the camera will  ## always be inside of it  box = ogre.AxisAlignedBox()  box.setInfinite()  self.setBoundingBox(box)  pass

8. This is a listener for after the drawBox has completed. This is what puts the selected entities into a list and shows the bounding box of the boats

9.  def __init__ ( self):  ogre.SceneQueryListener.__init__ ( self )  self.selectObjects = []  def queryResult ( self, firstMovable):  firstMovable.getParentSceneNode().showBoundingBox(True)  self.selectObjects.append(firstMovable)  return True  def deselectObjects(self):  for movableObject in self.selectObjects:  movableObject.getParentSceneNode().showBoundingBox(False)  self.selectObjects = []

10. This class has the most code crammed into it so be careful when implementing the class basically you will be adding a method called boxSelect and modifying the tick method and some variables in the initialization of the class

11.  We added these variables to make our lives a lot easier  self.box = SelectionRectangle("Box") #creates the box  self.engine.gfx.sceneManager.getRootSceneNode(). createChildSceneNode().attachObject(self.box) #this to get the positions of all the points inside of the rectangle  self.mVolQuery = self.engine.gfx.sceneManager.createPlaneBounded VolumeQuery(ogre.PlaneBoundedVolumeList())

12. #don’t have to do this but we wanted to attach the mouse to self so that we could access the mouse coordinates anywhere  self.left = 0.0  self.right = 0.0  self.top = 0.0  self.bottom = 0.0 #toggle for the mouse selection  self.mouseDown = None #gives access to the listener  self.querylistener = PlaneQueryListener()

13. topLeft = self.engine.gfx.camera.getCameraToViewportRay(self.left, self.top) do this for all the topRight, bottomLeft and bottomRight # this is to get the volume of the planes vol = ogre.PlaneBoundedVolume()

14.  Do this function for all five points it will be projected into the water plane to the boat selection  p = ogre.Plane( topLeft.getPoint(3),  topRight.getPoint(3),  bottomRight.getPoint(3))

15.  vol.planes.append(p) ## front plane  vol.planes.append(p2) ## left plane  vol.planes.append(p3) ## bottom plane  vol.planes.append(p4) ## top plane  vol.planes.append(p5) ## right plane  volList = ogre.PlaneBoundedVolumeList()  volList.append(vol)  self.mVolQuery.setVolumes(volList)  self.mVolQuery.execute(self.querylistener)  resultObjects = self.querylistener.selectObjects

16.  if resultObjects:  for name, ent in self.state.entities.iteritems():  for queryResult in resultObjects:  if queryResult.name == ent.gfxNode.name:  self.state.selectedEntities.append(ent)  print "Appended"

17.  if currMouse.buttonDown(OIS.MB_Left) and not self.mouseDown:  self.bb(isOn = False)  self.state.selectedEntities = []   self.left = float(currMouse.X.abs)/currMouse.width  self.top = float(currMouse.Y.abs)/currMouse.height  self.right = float(currMouse.X.abs)/currMouse.width  self.bottom = float(currMouse.Y.abs)/currMouse.height

18.  if currMouse.buttonDown(OIS.MB_Left) and self.mouseDown:  self.right = float(currMouse.X.abs)/currMouse.width  self.bottom = float(currMouse.Y.abs)/currMouse.height  self.box.drawBox(self.left,self.top,self.right,self.bott om)  self.box.setVisible(True)  print self.left,self.right,self.top,self.bottom  print "box drawn"

19.  if self.mouseDown and not currMouse.buttonDown(OIS.MB_Left):  if (self.left > self.right):  self.left, self.right = self.right, self.left  if (self.top > self.bottom):  self.top, self.bottom = self.bottom, self.top  self.box.setVisible(False)  if ((self.right - self.left) * (self.bottom - self.top) < 0.0001):  self.castRay(currMouse)  else:  self.boxSelect()

20.  if ((currMouse.buttonDown(OIS.MB_Right)) and  (self.toggleSpawn) and not (self.mouseRdown)):  self.spawnRay(currMouse)   self.mouseDown = currMouse.buttonDown(OIS.MB_Left)  self.mouseRdown = currMouse.buttonDown(OIS.MB_Right)