Pyqt 简明教程

PyQt - QPixmap Class

QPixmap 类提供图像的非屏幕表示。它可以用作 QPaintDevice 对象，也可以加载到另一个小部件，通常是标签或按钮。

QPixmap class provides an off-screen representation of an image. It can be used as a QPaintDevice object or can be loaded into another widget, typically a label or button.

Qt API 还有另一个相似的类 QImage，针对 I/O 和其他像素操作进行了优化。另一方面，Pixmap 针对在屏幕上显示进行了优化。这两种格式可以互相转换。

Qt API has another similar class QImage, which is optimized for I/O and other pixel manipulations. Pixmap, on the other hand, is optimized for showing it on screen. Both formats are interconvertible.

可以读入 QPixmap 中的图像文件类型如下 -

The types of image files that can be read into a QPixmap object are as follows −

BMP

Windows Bitmap

GIF

Graphic Interchange Format (optional)

JPG

Joint Photographic Experts Group

JPEG

Joint Photographic Experts Group

PNG

Portable Network Graphics

PBM

Portable Bitmap

PGM

Portable Graymap

PPM

Portable Pixmap

XBM

X11 Bitmap

XPM

X11 Pixmap

以下方法对于处理 QPixmap 对象很有用 -

Following methods are useful in handling QPixmap object −

Sr.No.

Methods & Description

1

copy() Copies pixmap data from a QRect object

2

fromImage() Converts QImage object into QPixmap

3

grabWidget() Creates a pixmap from the given widget

4

grabWindow() Create pixmap of data in a window

5

Load() Loads an image file as pixmap

6

save() Saves the QPixmap object as a file

7

toImage Converts a QPixmap to QImage

QPixmap 最常见的用途是在标签/按钮上显示图像。

The most common use of QPixmap is to display image on a label/button.

Example

以下示例展示了使用 setPixmap() 方法在 QLabel 上显示图像。完整的代码如下 -

The following example shows an image displayed on a QLabel by using the setPixmap() method. The complete code is as follows −

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

def window():
   app = QApplication(sys.argv)
   win = QWidget()
   l1 = QLabel()
   l1.setPixmap(QPixmap("python.jpg"))

   vbox = QVBoxLayout()
   vbox.addWidget(l1)
   win.setLayout(vbox)
   win.setWindowTitle("QPixmap Demo")
   win.show()
   sys.exit(app.exec_())

if __name__ == '__main__':
   window()

上述代码生成以下输出 -

The above code produces the following output −

qpixmap class output