How can I make a circle bounce in a window? - python-3.x

Question

I just made this program as a practice I want to make the circle bounce from end to end which I came up in this source codes can you make if happen.
import PyQt5,sys
from PyQt5 import QtCore,QtGui,QtWidgets
from PyQt5.QtCore import Qt,QTimer,QPoint
from PyQt5.QtWidgets import QWidget,QApplication,QMainWindow
from PyQt5.QtGui import QPainter
class Circle(QWidget):
def __init__(self):
QMainWindow.__init__(self)
self.resize(250,500)
self.setWindowTitle("Bounce-Man")
self.color = Qt.red
self.fixedplace = 125
self.mover = 450
def paintEvent(self,event):
bouncer.setPen(Qt.black)
bouncer.setBrush(self.color)
bouncer.drawEllipse(QPoint(self.fixedplace,self.mover),50,50)
#QtCore.pyqtSlot()
def timer(self):
timer = QTimer()
while self.mover >=50:
timer.start(1000)
if self.mover == 50:
self.mover = 450
self.mover -= 1
self.update()
if __name__ == "__main__":
window = QApplication(sys.argv)
app = Circle()
app.show()
sys.exit( window.exec_() )

Answer 1

You must use a QTimer to call a function that updates the position, do not use a while loop:
from PyQt5 import QtCore, QtGui, QtWidgets
class Circle(QtWidgets.QWidget):
def __init__(self, parent=None):
super(Circle, self).__init__(parent)
self.resize(250,500)
self.setWindowTitle("Bounce-Man")
self.color = QtGui.QColor(QtCore.Qt.red)
self.rect_circle = QtCore.QRect(0, 0, 50, 50)
self.rect_circle.moveCenter(QtCore.QPoint(self.width()/2, self.rect_circle.height()/2))
self.step = QtCore.QPoint(0, 5)
self.y_direction = 1
timer = QtCore.QTimer(self, interval=30)
timer.timeout.connect(self.update_position)
timer.start()
def paintEvent(self,event):
bouncer = QtGui.QPainter(self)
bouncer.setPen(QtCore.Qt.black)
bouncer.setBrush(self.color)
bouncer.drawEllipse(self.rect_circle)
#QtCore.pyqtSlot()
def update_position(self):
if self.rect_circle.bottom() > self.height() and self.y_direction == 1:
self.y_direction = -1
if self.rect_circle.top() < 0 and self.y_direction == -1:
self.y_direction = 1
self.rect_circle.translate(self.step * self.y_direction)
self.update()
if __name__ == "__main__":
import sys
window = QtWidgets.QApplication(sys.argv)
app = Circle()
app.show()
sys.exit( window.exec_() )