class MyGraphicsView(QGraphicsView):
def __init__(self):
super(MyGraphicsView, self).__init__()
scene = QGraphicsScene(self)
self.tic_tac_toe = TicTacToe()
scene.addItem(self.tic_tac_toe)
self.m = QPixmap("exit.png")
scene.addPixmap(self.m)
self.setScene(scene)
self.setCacheMode(QGraphicsView.CacheBackground)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
The png is already there. What is the way to increase its size while showing it on the screen in scrollbars?
Aim is to have a button on whose click the size of this picture should increase.
You have to use setScale(). Also when you use addPixmap() this returns the created QGraphicsPixmapItem.
In addition, the scaling is a transformation so it has a transformation origin, by default it is (0, 0), but in this case a better option would be to place it in the center of the image.
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
class MyGraphicsView(QGraphicsView):
def __init__(self):
super(MyGraphicsView, self).__init__()
scene = QGraphicsScene(self)
self.m = QPixmap("exit.png")
self.item = scene.addPixmap(self.m)
self.item.setTransformOriginPoint(self.item.boundingRect().center())
self.setScene(scene)
self.setCacheMode(QGraphicsView.CacheBackground)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
@pyqtSlot()
def scale_pixmap(self):
self.item.setScale(2*self.item.scale())
class Example(QMainWindow):
def __init__(self):
super(Example, self).__init__()
centralWidget = QWidget()
self.setCentralWidget(centralWidget)
lay = QVBoxLayout(centralWidget)
gv = MyGraphicsView()
button = QPushButton("scale")
lay.addWidget(gv)
lay.addWidget(button)
button.clicked.connect(gv.scale_pixmap)
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
w = Example()
w.show()
sys.exit(app.exec_())