Drawing text

We begin with drawing some Unicode text on the client area of a window.

#!/usr/bin/python

# -*- coding: utf-8 -*-

"""

ZetCode PyQt4 tutorial 

In this example, we draw text in Russian azbuka.

author: Jan Bodnar

website: zetcode.com

last edited: September 2011

"""

import sys

from PyQt4 import QtGui, QtCore

class Example(QtGui.QWidget):

    def __init__(self):

        super(Example, self).__init__()

        self.initUI()

    def initUI(self):      

        self.text = u'\u041b\u0435\u0432 \u041d\u0438\u043a\u043e\u043b\u0430\

\u0435\u0432\u0438\u0447 \u0422\u043e\u043b\u0441\u0442\u043e\u0439: \n\

\u0410\u043d\u043d\u0430 \u041a\u0430\u0440\u0435\u043d\u0438\u043d\u0430'

        self.setGeometry(300, 300, 280, 170)

        self.setWindowTitle('Draw text')

        self.show()

    def paintEvent(self, event):

        qp = QtGui.QPainter()

        qp.begin(self)

        self.drawText(event, qp)

        qp.end()

    def drawText(self, event, qp):

        qp.setPen(QtGui.QColor(168, 34, 3))

        qp.setFont(QtGui.QFont('Decorative', 10))

        qp.drawText(event.rect(), QtCore.Qt.AlignCenter, self.text)        

def main():

    app = QtGui.QApplication(sys.argv)

    ex = Example()

    sys.exit(app.exec_())

if __name__ == '__main__':

    main()

In our example, we draw some text in Azbuka. The text is vertically and horizontally aligned.

def paintEvent(self, event):

...

Drawing is done within the paint event.

qp = QtGui.QPainter()

qp.begin(self)

self.drawText(event, qp)

qp.end()

The QtGui.QPainter class is responsible for all the low-level painting. All the painting methods go between begin() and end() methods. The actual painting is delegated to the drawText() method.

qp.setPen(QtGui.QColor(168, 34, 3))

qp.setFont(QtGui.QFont('Decorative', 10))

Here we define a pen and a font which are used to draw the text.

qp.drawText(event.rect(), QtCore.Qt.AlignCenter, self.text)

The drawText() method draws text on the window. The rect() method of the paint event returns the rectangle that needs to be updated.

Figure: Drawing text

巴特西

Drawing text

最新文章

热门文章