This question already has answers here:
Strange pixels drawn on QPixmap
(1 answer)
Qt: Empty transparent QImage has noise
(1 answer)
Closed 4 months ago.
import sys
from PyQt5 import QtCore, QtGui, QtWidgets, uic
from PyQt5.QtCore import Qt
class MainWindow(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.label = QtWidgets.QLabel()
canvas = QtGui.QPixmap(400, 300)
self.label.setPixmap(canvas)
self.setCentralWidget(self.label)
self.draw_something()
def draw_something(self):
painter = QtGui.QPainter(self.label.pixmap())
painter.drawLine(10, 10, 300, 200)
painter.end()
app = QtWidgets.QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec_()
Im trying to learn about graphics in Qt5 following the tutorials I came across this code why does it produce a black canvas ,im using ubuntu with a window manager i3
Related
This question already has answers here:
Easiest way to subclass a widget in Python for use with Qt Designer
(2 answers)
Custom Qt Widgets with python for Qt Designer
(3 answers)
Closed 18 days ago.
I'm relatively new to Python. I have a program that does a lot of cool stuff. However, I seem to be restricted with adding in custom widgets because I'm relying on a .ui file to load my entire gui like so:
class Ui(QtWidgets.QMainWindow):
def __init__(self):
super(Ui, self).__init__()
uic.loadUi('images/structure.ui', self)
I want to be able to insert the below entire search widget into a specific part of my GUI.
https://learndataanalysis.org/create-an-instant-search-feature-to-search-data-in-your-table-in-pyqt5/
code:
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLineEdit, QTableView, QHeaderView, QVBoxLayout
from PyQt5.QtCore import Qt, QSortFilterProxyModel
from PyQt5.QtGui import QStandardItemModel, QStandardItem
class AppDemo(QWidget):
def __init__(self):
super().__init__()
self.resize(1200, 1000)
mainLayout = QVBoxLayout()
companies = ('Apple', 'Facebook', 'Google', 'Amazon', 'Walmart', 'Dropbox', 'Starbucks', 'eBay', 'Canon')
model = QStandardItemModel(len(companies), 1)
model.setHorizontalHeaderLabels(['Company'])
for row, company in enumerate(companies):
item = QStandardItem(company)
model.setItem(row, 0, item)
filter_proxy_model = QSortFilterProxyModel()
filter_proxy_model.setSourceModel(model)
filter_proxy_model.setFilterCaseSensitivity(Qt.CaseInsensitive)
filter_proxy_model.setFilterKeyColumn(0)
search_field = QLineEdit()
search_field.setStyleSheet('font-size: 35px; height: 60px;')
search_field.textChanged.connect(filter_proxy_model.setFilterRegExp)
mainLayout.addWidget(search_field)
table = QTableView()
table.setStyleSheet('font-size: 35px;')
table.verticalHeader().setSectionResizeMode(QHeaderView.Stretch)
table.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)
table.setModel(filter_proxy_model)
mainLayout.addWidget(table)
self.setLayout(mainLayout)
app = QApplication(sys.argv)
demo = AppDemo()
demo.show()
sys.exit(app.exec_())
Do I have to edit my .ui file to make this happen? I tried creating widgets named search_field and table, and there was no impact. How can I simply create search_field as a qline edit, and table as a TableView or some sort of ListView Widget, and have the above code search properly?
I tried using the above code
edit:
basically, I just want to be able to ctrl + F and search for text in a textBrowser widget.
I am trying to draw a dot on my main window, but the dot is not shown.
I've tried bounding mousePressEvent to paintEvent, but it didn't work as well. Here's current version of my code(which is not working too). Also I tried place a point with drawPoint method and it didn't work too.
import sys
from PyQt5 import QtWidgets, QtGui, QtCore, uic
class GUI(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
uic.loadUi('gui.ui', self)
self.setFixedSize(self.size())
self.show()
def mousePressEvent(self, e):
print(e.pos())
qp = QtGui.QPainter()
qp.begin(self)
qp.setPen(QtCore.Qt.red)
qp.drawEllipse(e.pos().x(), e.pos().y(), 10, 10)
qp.end()
self.update()
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
window = GUI()
sys.exit(app.exec_())
I know that mousePressEvent is working since I get coords of the click.
I am okay to change methods of dot-placing or type of dots to place, but it should have customizable color and size.
You should only draw within the paintEvent method, and this paint does not save memory so if you want to graph several points you must store them in some container, for example using QPolygon.
paintEvent() is called every time you call update() or repaint(), for example it is called every time it is resized, the window is moved, etc.
import sys
from PyQt5 import QtWidgets, QtGui, QtCore, uic
class GUI(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
uic.loadUi('gui.ui', self)
self.setFixedSize(self.size())
self.show()
self.points = QtGui.QPolygon()
def mousePressEvent(self, e):
self.points << e.pos()
self.update()
def paintEvent(self, ev):
qp = QtGui.QPainter(self)
qp.setRenderHint(QtGui.QPainter.Antialiasing)
pen = QtGui.QPen(QtCore.Qt.red, 5)
brush = QtGui.QBrush(QtCore.Qt.red)
qp.setPen(pen)
qp.setBrush(brush)
for i in range(self.points.count()):
qp.drawEllipse(self.points.point(i), 5, 5)
# or
# qp.drawPoints(self.points)
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
window = GUI()
sys.exit(app.exec_())
I've been following a tutorial in Kivy and encounter a problem. When I'm changing the size of my window the images doesn't display. My code is:
from kivy.core.window import Window
from kivy.uix.widget import Widget
from kivy.uix.image import Image
from kivy.app import App
class Sprite(Image):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.size = self.texture_size
class Game(Widget):
def __init__(self):
super().__init__()
self.background = Sprite(source="Sprites/CartoonForest.png")
self.size = self.background.size
self.add_widget(self.background)
class GameApp(App):
def build(self):
game = Game()
Window.size = game.size
return game
if __name__ == '__main__':
GameApp().run()
I played around a bit, imported different images of different extensions and sizes, changed in the code and such, but only when I left out the line Window.size = game.size in the build method in GameApp it displayed the image. When I resized the window by dragging the corner of the image disappeared as well.
What is the reason for this and how could I fix the screen size to match the image size?
I'm using:
Mac OS X Yosemite 10.10.5
PyCharm Community Edition 2016.1.4
Python 3.5.2
Kivy v1.9.1
It was a bug of the current version I was using. Downloading the newer versions from github fixed the problem!
How to make one single scroll bar for two QTextEdit, pyqt4, python. Or how to synchronize two scrollbars of two QTextEdit. For simultaneous scrolling texts.
Pyqt4, python.
Cross-connect the value changed signals of all the scrollbars:
from PyQt4 import QtCore, QtGui
class Window(QtGui.QWidget):
def __init__(self):
super(Window, self).__init__()
self.edit1 = QtGui.QTextEdit(self)
self.edit2 = QtGui.QTextEdit(self)
layout = QtGui.QHBoxLayout(self)
layout.addWidget(self.edit1)
layout.addWidget(self.edit2)
self.edit1.horizontalScrollBar().valueChanged.connect(
self.edit2.horizontalScrollBar().setValue)
self.edit1.verticalScrollBar().valueChanged.connect(
self.edit2.verticalScrollBar().setValue)
self.edit2.horizontalScrollBar().valueChanged.connect(
self.edit1.horizontalScrollBar().setValue)
self.edit2.verticalScrollBar().valueChanged.connect(
self.edit1.verticalScrollBar().setValue)
text = '\n'.join(name for name in dir(QtCore))
self.edit1.setText(text)
self.edit2.setText(text)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = Window()
window.setGeometry(500, 300, 600, 400)
window.show()
sys.exit(app.exec_())
New to PyQt5... Here is a very basic question.
I would like to add an image inside the layout of a widget. This widget is the Main Window / root widget of my application. I use the following code, but I get an error message.
import sys
from PyQt5.QtGui import QImage
from PyQt5.QtWidgets import *
class MainWindow(QWidget):
def __init__(self):
super().__init__()
self.setGeometry(300,300,300,220)
self.setWindowTitle("Hello !")
oImage = QImage("backgound.png")
oLayout = QVBoxLayout()
oLayout.addWidget(oImage)
self.setLayout(oLayout)
self.show()
if __name__ == "__main__":
app = QApplication(sys.argv)
oMainwindow = MainWindow()
sys.exit(app.exec_())
TypeError: QBoxLayout.addWidget(QWidget, int stretch=0, Qt.Alignment alignment=0): argument 1 has unexpected type 'QImage'
Apparently a QLayoutWidget does not accept a QImage as an input. Is there a workaround to have an image appear as a brackground in a QWidget ?
The QVBoxLayout class lines up widgets vertically.
documentation QVBoxLayout
QImage is no widget.
on many widgets e.g. QmainWindow, QLabel you can use
widget.setStyleSheet(„ background-image: url(backgound.png);“)
on my machine this doesn't work with QWidget. In this case you can use the following rewrite of your code:
import sys
from PyQt5.QtCore import QSize
from PyQt5.QtGui import QImage, QPalette, QBrush
from PyQt5.QtWidgets import *
class MainWindow(QWidget):
def __init__(self):
QWidget.__init__(self)
self.setGeometry(100,100,300,200)
oImage = QImage("test.png")
sImage = oImage.scaled(QSize(300,200)) # resize Image to widgets size
palette = QPalette()
palette.setBrush(QPalette.Window, QBrush(sImage))
self.setPalette(palette)
self.label = QLabel('Test', self) # test, if it's really backgroundimage
self.label.setGeometry(50,50,200,50)
self.show()
if __name__ == "__main__":
app = QApplication(sys.argv)
oMainwindow = MainWindow()
sys.exit(app.exec_())