def testQGraphicsProxyWidget(self):
scene = QGraphicsScene()
proxy = QGraphicsProxyWidget(None, Qt.Window)
widget = QLabel('Widget')
proxy.setWidget(widget)
proxy.setCacheMode(QGraphicsItem.DeviceCoordinateCache)
scene.addItem(proxy)
scene.setSceneRect(scene.itemsBoundingRect())
view = QGraphicsView(scene)
view.setRenderHints(QPainter.Antialiasing|QPainter.SmoothPixmapTransform)
view.setViewportUpdateMode(QGraphicsView.BoundingRectViewportUpdate)
view.show()
timer = QTimer.singleShot(100, self.app.quit)
self.app.exec_()
def testCustomProxyWidget(self):
scene = QGraphicsScene()
proxy = CustomProxy(None, Qt.Window)
widget = QLabel('Widget')
proxy.setWidget(widget)
proxy.setCacheMode(QGraphicsItem.DeviceCoordinateCache)
scene.addItem(proxy)
scene.setSceneRect(scene.itemsBoundingRect())
view = QGraphicsView(scene)
view.setRenderHints(QPainter.Antialiasing|QPainter.SmoothPixmapTransform)
view.setViewportUpdateMode(QGraphicsView.BoundingRectViewportUpdate)
view.show()
timer = QTimer.singleShot(100, self.app.quit)
self.app.exec_()
class SceneManager():
def __init__(self, graphicsView):
self.scene = QGraphicsScene()
self.scene.setSceneRect(0,0,SCENE_WIDTH,SCENE_HEIGHT)
graphicsView.setScene(self.scene)
# handles physics involved in collisiions/detection
self.cm = collisionManager()
# add object to simulation scene (given parameters)
# input: 'values' contains (x,y,x_vel,y_vel,mass,radius)
def addItem(self,param):
values = self.decode(param)
item = Ball(values[0],values[1],values[4],values[5])
item.set_velocity(values[2],values[3])
self.scene.addItem(item)
def addItems(self,items):
for item in items:
values = self.decode(item)
ball_obj = Ball(values[0],values[1],values[4],values[5])
ball_obj.set_velocity(values[2],values[3])
self.scene.addItem(ball_obj)
# translate parameters received by TCP
def decode(self,msg):
delims = ['r','m','yv','xv','y','x']
values = []
# traverses delimeters to extract values
for i in range(len(delims)):
index = msg.index(delims[i]) # search for delimeter
arg = msg[index + len(delims[i]) :] # extract value
values.append(int(float(arg))) # store value
msg = msg[:index] # reduce message left to parse
values.reverse()
return values
# access all items in the simulation scene
def getItems(self):
return self.scene.items()
def deleteItems(self):
return self.scene.clear()
def getItemsForTCP(self):
items = self.scene.items()
tcp_list = []
for item in items:
tcp_list.append(str(item))
return tcp_list
# determine an item's next location
def next_move(self,item):
# check whether any ball-to-ball collisions will occur
collisions = self.cm.if_ball_collision(item,self.getItems())
if (len(collisions) > 0): # colllision identified
# print '\nInside next_move()'
# print ('Item: ' + str(item) + ' List: ' )#+ str(collisions))
# for ball in collisions:
# print str(ball) #DEBUG
# obtain velocities so that balls just collide
delta_x, delta_y = self.cm.vel_to_ball(item,collisions[0])
# delta_x = item.x_vel
# delta_y = item.y_vel
self.cm.ball_to_ball(item,collisions[0])
else:
# determine if a wall will be hit in the next move
hit_wall = self.cm.if_wall_collision(item,SCENE_HEIGHT,SCENE_WIDTH)
if (hit_wall != 'NONE'): # if wall collision will occur
# determine displacement left to collide with wall
delta_x, delta_y = self.cm.vel_to_wall(item,hit_wall,SCENE_HEIGHT,SCENE_WIDTH)
# set object's velocity after impacting the wall
self.cm.ball_to_wall(item,hit_wall)
else:
#keep the ball in the same trajectory
delta_x = item.x_vel
delta_y = item.y_vel
# next x/y destination of the item in LOCAL coordinates
# require the offsets (-item.x_start and -item.y_start)
# given the fact that the item.x_pos and item.y_pos values
# represent locations in global coordinates
next_x = item.x_pos + delta_x - item.x_start
next_y = item.y_pos + delta_y - item.y_start
return next_x,next_y
