[英]How to zoom a picture implemented with QPixmap on pyqt5
我正在尝试放大使用 QPixmap 实现的图片,但没有任何效果。 这是我实现这一点的方式。 (self.hauteur 是一个浮点数,代表高度)
self.label.setPixmap(QPixmap(self.image).scaledToHeight(self.hauteur))
我已将 label 放入布局中,然后将其放入滚动小部件中。
self.layout6.addWidget(self.label)
...
self.widget1=QWidget()
self.widget1.setLayout(self.layout6)
self.scroll1.setWidget(self.widget1)
self.tab1.layout.addWidget(self.scroll1,0,1,1,2)
...
self.tab1.setLayout(self.tab1.layout)
如果我想构建一种方法,通过按下按钮来放大或缩小 window 中的图片,我应该怎么做? 我试图调整 label 的大小,但它不起作用。
self.action5=QAction(QIcon("Icon/in"),"Zoom in",self)
self.action5.triggered.connect(self.zoomin)
...
def zoomin(self):
self.hauteur+=100
self.label.scaledToHeight(self.hauteur)
self.update()
我会调整原始QPixmap
的大小并将其再次放入label
self.scale *= 2
size = self.pixmap.size()
scaled_pixmap = self.pixmap.scaled(self.scale * size)
self.label.setPixmap(scaled_pixmap)
最小的工作代码:
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
class MyApp(QWidget):
def __init__(self, *args):
super().__init__(*args)
self.layout = QVBoxLayout()
self.setLayout(self.layout)
self.button_zoom_in = QPushButton('Zoom IN', self)
self.button_zoom_in.clicked.connect(self.on_zoom_in)
self.layout.addWidget(self.button_zoom_in)
self.button_zoom_out = QPushButton('Zoom OUT', self)
self.button_zoom_out.clicked.connect(self.on_zoom_out)
self.layout.addWidget(self.button_zoom_out)
self.pixmap = QPixmap('image.jpg')
self.label = QLabel(self)
self.label.setPixmap(self.pixmap)
self.layout.addWidget(self.label)
self.scale = 1
self.show()
def on_zoom_in(self, event):
self.scale *= 2
self.resize_image()
def on_zoom_out(self, event):
self.scale /= 2
self.resize_image()
def resize_image(self):
size = self.pixmap.size()
scaled_pixmap = self.pixmap.scaled(self.scale * size)
self.label.setPixmap(scaled_pixmap)
# --- main ---
app = QApplication([])
win = MyApp()
app.exec()
编辑:同样使用self.height += 100
而不是self.scale *= 2
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
class MyApp(QWidget):
def __init__(self, *args):
super().__init__(*args)
self.layout = QVBoxLayout()
self.setLayout(self.layout)
self.button_zoom_in = QPushButton('Zoom IN', self)
self.button_zoom_in.clicked.connect(self.on_zoom_in)
self.layout.addWidget(self.button_zoom_in)
self.button_zoom_out = QPushButton('Zoom OUT', self)
self.button_zoom_out.clicked.connect(self.on_zoom_out)
self.layout.addWidget(self.button_zoom_out)
self.pixmap = QPixmap('image.jpg')
self.height = self.pixmap.height()
self.label = QLabel(self)
self.label.setPixmap(self.pixmap)
self.layout.addWidget(self.label)
self.show()
def on_zoom_in(self, event):
self.height += 100
self.resize_image()
def on_zoom_out(self, event):
self.height -= 100
self.resize_image()
def resize_image(self):
scaled_pixmap = self.pixmap.scaledToHeight(self.height)
self.label.setPixmap(scaled_pixmap)
# --- main ---
app = QApplication([])
win = MyApp()
app.exec()
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.