Font Configuration

In the previous section, we learned the basic methods of drawing graphics. In this section, we'll learn about pen and brush configuration.

Font Object (QFont)

The font object is primarily used to set font size, style, etc.

Common Font Methods	Description
setFamily()	Set the font type
setPointSize()	Set the font size
setBold()	Set bold. Parameters: True for bold, False for normal
setItalic()	Set italic. Parameters: True for italic, False for normal
setOverline()	Set text overline
setUnderline()	Set text underline
setStrikeOut()	Set text strikethrough

Example

Example: Make the font in the previous text-drawing example larger and bolder.

Here's the implementation code:

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

# pyQT5 For WalnutPi

from PyQt5 import QtCore, QtGui, QtWidgets

from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPainter, QFont
from PyQt5.QtWidgets import QWidget

class Window(QWidget):
    
    def __init__(self):
        super().__init__() # Execute the parent QWidget's __init__ as well
        self.setWindowTitle("WalnutPi Paint") # Set window title
        self.resize(480,320) # Set window size
        
        # Window background color setting
        self.setObjectName("Paint_Window")
        self.setStyleSheet("#Paint_Window{background-color: black}") # Black

    def paintEvent(self,event):
        
        painter=QPainter(self) # Create drawing object
        painter.setPen(Qt.green) # Set pen, green
        
        # Configure font
        font = QFont()
        font.setFamily("YouYuan") # Font type
        font.setPointSize(50) # Size
        font.setBold(True) # Bold
        painter.setFont(font)
        
        # Draw text
        painter.drawText(100, 100, "WalnutPi!")
     
#################
#   Main Code    #
#################
import sys

# [Optional] Allow Thonny remote execution
import os
os.environ["DISPLAY"] = ":0.0"

# [Optional] Fix display issues on 2K+ resolution monitors
QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)

# Main program entry — build and display the window
app = QtWidgets.QApplication(sys.argv)
window = Window() # Create window object
window.show() # Show window
#window.showFullScreen() # Full-screen display

# [Recommended] Allow Ctrl+C to interrupt the window from terminal for easier debugging
import signal
signal.signal(signal.SIGINT, signal.SIG_DFL)
timer = QtCore.QTimer()
timer.start(100)  # You may change this if you wish.
timer.timeout.connect(lambda: None)  # Let the interpreter run each 100 ms

sys.exit(app.exec_()) # Exit the process when the window is closed

The main difference from the previous code is the addition of font configuration:

    def paintEvent(self,event):

        ...

        # Configure font
        font = QFont()
        font.setFamily("YouYuan") # Font type
        font.setPointSize(50) # Size
        font.setBold(True) # Bold
        painter.setFont(font)
        

The result is as follows: