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Multiple Selection. By JerryDean Smith Chad Adams Karl Mullner. Creating Rectangle Class. 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
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Multiple Selection By JerryDean Smith Chad Adams Karl Mullner
Creating Rectangle Class • 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
Selection Rectangle Methods • Methods inside of Selection Rectangle Class • def __init__(self,name): • defdrawBox(self, left, top, right, bottom):
initialization • 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.RenderQueueGroupID.RENDER_QUEUE_OVERLAY) • self.setUseIdentityProjection(True) • self.setUseIdentityView(True) • self.setQueryFlags(0)
DrawBox • 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
DrawBox continued.. • 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()
DrawBox continued.. • 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
PlaneQueryListenerClass 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
PlaneQueryListenerMethods: • def__init__ ( self): • ogre.SceneQueryListener.__init__ ( self ) • self.selectObjects = [] • defqueryResult ( self, firstMovable): • firstMovable.getParentSceneNode().showBoundingBox(True) • self.selectObjects.append(firstMovable) • return True • defdeselectObjects(self): • for movableObject in self.selectObjects: • movableObject.getParentSceneNode().showBoundingBox(False) • self.selectObjects = []
Selection Manager Class • 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
initialization • 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.createPlaneBoundedVolumeQuery(ogre.PlaneBoundedVolumeList())
Initialization continued.. #don’t have to do this but it makes it a lot easier to access the mouse coordinates • 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()
boxSelect 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()
boxSelect continued.. • 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))
boxSelect continued.. • 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
boxSelect continued.. • 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"
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
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.bottom) • self.box.setVisible(True) • print self.left,self.right,self.top,self.bottom • print "box drawn"
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()
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)
