class App(object):
def __init__(self):
self.render_asap = False;
self.app_should_exit = False
self.root = Tk()
self.scene = None
self.lastUpdateMoment = 0
self.renderingTechniq = RENDER_ON_MAINLOOP
def setAppExit(self):
self.app_should_exit = TRUE
def initialize(self):
speller = GazeSpeller()
tracker = self._ckeckAvailableTracker()
canvas = self._initializeCanvas()
if isinstance(tracker,MouseTracker):
canvas.bind('<Motion>',tracker.onMotion) # use this to let the tracker get updates from the mouse event without actual get knowledge of the GUIs
# it's named "inversion of control"
self.scene = Scene(canvas, tracker, speller)
self.scene.initialize(1)
def startRendering(self):
if self.renderingTechniq == RENDER_ON_MAINLOOP:
self.runOnTkInterMainLoop()
if self.renderingTechniq == RENDER_ON_TIMER_TICK:
self.runOnExpectedFixedFramerate()
sys.exit(0)
def _ckeckAvailableTracker(self):
#TODO check if tracker available if not use mouse
return MouseTracker(self.root)
def _initializeCanvas(self):
self.root.attributes("-fullscreen", True)
self.root.protocol("WM_DELETE_WINDOW", self.setAppExit)
canvas = Canvas(self.root)
canvas.pack(fill=BOTH, expand=YES)
return canvas
def _processRenderLoop(self, deltaTime, CallTkUpdates = False):
self.scene.update(deltaTime)
self.scene.render()
if CallTkUpdates:
self.root.update_idletasks() # render / drawing
self.root.update() # perform processing of key events etc
def _estimateFrameTime(self):
currentMoment = time()
deltaTime = currentMoment - self.lastUpdateMoment
self.lastUpdateMoment = currentMoment
return deltaTime
# example rendering A
def runOnExpectedFixedFramerate(self):
self.lastUpdateMoment = time()
while not self.app_should_exit:
deltaTime = self._estimateFrameTime()
self._processRenderLoop(deltaTime, CallTkUpdates = True)
if not self.render_asap:
sleep(self.scene.getExpectedUpdateTime())
#example rendering B
def runOnTkInterMainLoop(self):
self._callUpdatingOnAfterCall();
self.root.mainloop()
def _callUpdatingOnAfterCall(self):
deltaTime = self._estimateFrameTime()
self._processRenderLoop(deltaTime)
# uses a scheduler from tkinter GUI Mainloop - test
# self.scene.getExpectedUpdateTime()
self.root.after(1, self._callUpdatingOnAfterCall)
