118 lines
3.8 KiB
Python
118 lines
3.8 KiB
Python
# piker: trading gear for hackers
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# Copyright (C) Tyler Goodlet (in stewardship for pikers)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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A per-display, DPI (scaling) info dumper.
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Resource list for mucking with DPIs on multiple screens:
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- https://stackoverflow.com/questions/42141354/convert-pixel-size-to-point-size-for-fonts-on-multiple-platforms
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- https://stackoverflow.com/questions/25761556/qt5-font-rendering-different-on-various-platforms/25929628#25929628
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- https://doc.qt.io/qt-5/highdpi.html
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- https://stackoverflow.com/questions/20464814/changing-dpi-scaling-size-of-display-make-qt-applications-font-size-get-rendere
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- https://stackoverflow.com/a/20465247
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- https://doc.qt.io/archives/qt-4.8/qfontmetrics.html#width
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- https://forum.qt.io/topic/54136/how-do-i-get-the-qscreen-my-widget-is-on-qapplication-desktop-screen-returns-a-qwidget-and-qobject_cast-qscreen-returns-null/3
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- https://forum.qt.io/topic/43625/point-sizes-are-they-reliable/4
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- https://stackoverflow.com/questions/16561879/what-is-the-difference-between-logicaldpix-and-physicaldpix-in-qt
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- https://doc.qt.io/qt-5/qguiapplication.html#screenAt
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'''
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from pyqtgraph import QtGui
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from PyQt6 import (
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QtCore,
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QtWidgets,
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)
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from PyQt6.QtCore import (
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Qt,
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QCoreApplication,
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QSize,
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QRect,
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)
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# Proper high DPI scaling is available in Qt >= 5.6.0. This attibute
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# must be set before creating the application
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if hasattr(Qt, 'AA_EnableHighDpiScaling'):
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QCoreApplication.setAttribute(
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Qt.AA_EnableHighDpiScaling,
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True,
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)
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if hasattr(Qt, 'AA_UseHighDpiPixmaps'):
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QCoreApplication.setAttribute(
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Qt.AA_UseHighDpiPixmaps,
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True,
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)
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app = QtWidgets.QApplication([])
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window = QtWidgets.QMainWindow()
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main_widget = QtWidgets.QWidget()
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window.setCentralWidget(main_widget)
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window.show()
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pxr: float = main_widget.devicePixelRatioF()
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# explicitly get main widget and primary displays
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current_screen: QtGui.QScreen = app.screenAt(
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main_widget.geometry().center()
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)
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primary_screen: QtGui.QScreen = app.primaryScreen()
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screen: QtGui.QScreen
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for screen in app.screens():
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name: str = screen.name()
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model: str = screen.model().rstrip()
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size: QSize = screen.size()
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geo: QRect = screen.availableGeometry()
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phydpi: float = screen.physicalDotsPerInch()
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logdpi: float = screen.logicalDotsPerInch()
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is_primary: bool = screen is primary_screen
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is_current: bool = screen is current_screen
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print(
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f'------ screen name: {name} ------\n'
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f'|_primary: {is_primary}\n'
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f' _current: {is_current}\n'
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f' _model: {model}\n'
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f' _screen size: {size}\n'
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f' _screen geometry: {geo}\n'
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f' _devicePixelRationF(): {pxr}\n'
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f' _physical dpi: {phydpi}\n'
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f' _logical dpi: {logdpi}\n'
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)
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# app-wide font info
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font = QtGui.QFont("Hack")
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# use pixel size to be cross-resolution compatible?
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font.setPixelSize(6)
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fm = QtGui.QFontMetrics(font)
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fontdpi: float = fm.fontDpi()
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font_h: int = fm.height()
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string: str = '10000'
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str_br: QtCore.QRect = fm.boundingRect(string)
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str_w: int = str_br.width()
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print(
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f'------ global font settings ------\n'
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f'font dpi: {fontdpi}\n'
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f'font height: {font_h}\n'
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f'string bounding rect: {str_br}\n'
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f'string width : {str_w}\n'
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)
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