[GUI with Python] PyQt5 -Paint-
Continuation of Last time
Painting I will summarize this site roughly in Japanese.
[Character painting]
Drawing_text.py
#!/usr/bin/python3
# -*- coding: utf-8 -*-
import sys
from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QColor, QFont
from PyQt5.QtCore import Qt
class Example(QWidget):
def __init__(self):
super().__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()
#Event handler for drawing
def paintEvent(self, event):
qp = QPainter()
#Write a method for painting between the begin and end methods
qp.begin(self)
self.drawText(event, qp)
qp.end()
def drawText(self, event, qp):
#Character color specification
qp.setPen(QColor(168, 34, 3))
#Specify font and font size
qp.setFont(QFont('Decorative', 10))
#The first argument is the main screen that needs to be updated
#The second argument moves the character to the middle
#The third argument is the text to insert
qp.drawText(event.rect(), Qt.AlignCenter, self.text)
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
[Draw a point]
Drawing_points.py
#!/usr/bin/python3
# -*- coding: utf-8 -*-
import sys, random
from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QColor, QPen
from PyQt5.QtCore import Qt
class Example(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
self.setGeometry(300, 300, 280, 170)
self.setWindowTitle('Points')
self.show()
def paintEvent(self, e):
qp = QPainter()
qp.begin(self)
self.drawPoints(qp)
qp.end()
def drawPoints(self, qp):
#Prepare a red pen
qp.setPen(Qt.red)
#Set the window size (paintEvent occurs when the size changes)
size = self.size()
#Draw 1000 dots at random
for i in range(1000):
x = random.randint(1, size.width()-1)
y = random.randint(1, size.height()-1)
qp.drawPoint(x, y)
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
[How to specify the color]
Colours.py
#!/usr/bin/python3
# -*- coding: utf-8 -*-
import sys
from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QColor, QBrush
class Example(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
self.setGeometry(300, 300, 350, 100)
self.setWindowTitle('Colours')
self.show()
def paintEvent(self, e):
qp = QPainter()
qp.begin(self)
self.drawRectangles(qp)
qp.end()
def drawRectangles(self, qp):
#Specify the color of the line around the rectangle (RGB)
col = QColor(0, 0, 0)
#Specify the color of the line around the rectangle (hex number)
col.setNamedColor('#d4d4d4')
#Set the color of the pen
qp.setPen(col)
# Qcolor(Red, Green, Blue, Alpha)Alpha is transparent
qp.setBrush(QColor(200, 0, 0))
# drawRect(x, y, width, height)
qp.drawRect(10, 15, 90, 60)
qp.setBrush(QColor(255, 80, 0, 160))
qp.drawRect(130, 15, 90, 60)
qp.setBrush(QColor(25, 0, 90, 200))
qp.drawRect(250, 15, 90, 60)
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
[Pen style]
QPen.py
#!/usr/bin/python3
# -*- coding: utf-8 -*-
import sys
from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QColor, QPen
from PyQt5.QtCore import Qt
class Example(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
self.setGeometry(300, 300, 280, 270)
self.setWindowTitle('Pen styles')
self.show()
def paintEvent(self, e):
qp = QPainter()
qp.begin(self)
self.drawLines(qp)
qp.end()
def drawLines(self, qp):
#Set the pen color to black, width to 2 pixels, and style to SolidLine
pen = QPen(Qt.black, 2, Qt.SolidLine)
#Set the pen style specified above
qp.setPen(pen)
#drawing
qp.drawLine(20, 40, 250, 40)
#Change style to DashLine
pen.setStyle(Qt.DashLine)
qp.setPen(pen)
qp.drawLine(20, 80, 250, 80)
pen.setStyle(Qt.DashDotLine)
qp.setPen(pen)
qp.drawLine(20, 120, 250, 120)
pen.setStyle(Qt.DotLine)
qp.setPen(pen)
qp.drawLine(20, 160, 250, 160)
pen.setStyle(Qt.DashDotDotLine)
qp.setPen(pen)
qp.drawLine(20, 200, 250, 200)
#Set your own style
pen.setStyle(Qt.CustomDashLine)
# setDashPattern([1px line,4px space,5px line,4px space])
pen.setDashPattern([1, 4, 5, 4])
qp.setPen(pen)
qp.drawLine(20, 240, 250, 240)
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
【fill】
QBrush.py
#!/usr/bin/python3
# -*- coding: utf-8 -*-
import sys
from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QBrush
from PyQt5.QtCore import Qt
class Example(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
self.setGeometry(300, 300, 355, 280)
self.setWindowTitle('Brushes')
self.show()
def paintEvent(self, e):
qp = QPainter()
qp.begin(self)
self.drawBrushes(qp)
qp.end()
def drawBrushes(self, qp):
#Specify Solid Pattern style
brush = QBrush(Qt.SolidPattern)
#Designated as a brush
qp.setBrush(brush)
#Make a rectangle and fill it
qp.drawRect(10, 15, 90, 60)
brush.setStyle(Qt.Dense1Pattern)
qp.setBrush(brush)
qp.drawRect(130, 15, 90, 60)
brush.setStyle(Qt.Dense2Pattern)
qp.setBrush(brush)
qp.drawRect(250, 15, 90, 60)
brush.setStyle(Qt.Dense3Pattern)
qp.setBrush(brush)
qp.drawRect(10, 105, 90, 60)
brush.setStyle(Qt.DiagCrossPattern)
qp.setBrush(brush)
qp.drawRect(10, 105, 90, 60)
brush.setStyle(Qt.Dense5Pattern)
qp.setBrush(brush)
qp.drawRect(130, 105, 90, 60)
brush.setStyle(Qt.Dense6Pattern)
qp.setBrush(brush)
qp.drawRect(250, 105, 90, 60)
brush.setStyle(Qt.HorPattern)
qp.setBrush(brush)
qp.drawRect(10, 195, 90, 60)
brush.setStyle(Qt.VerPattern)
qp.setBrush(brush)
qp.drawRect(130, 195, 90, 60)
brush.setStyle(Qt.BDiagPattern)
qp.setBrush(brush)
qp.drawRect(250, 195, 90, 60)
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
Next time will try Custom widgets roughly.
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