Draft screen / font / dpi info script

snippets/qt_screen_info.py

@@ -0,0 +1,87 @@
+from pyqtgraph import QtGui
+from PyQt5 import QtCore
+from PyQt5.QtCore import (
+     Qt, QCoreApplication
+)
+
+# Proper high DPI scaling is available in Qt >= 5.6.0. This attibute
+# must be set before creating the application
+if hasattr(Qt, 'AA_EnableHighDpiScaling'):
+    QCoreApplication.setAttribute(Qt.AA_EnableHighDpiScaling, True)
+
+if hasattr(Qt, 'AA_UseHighDpiPixmaps'):
+    QCoreApplication.setAttribute(Qt.AA_UseHighDpiPixmaps, True)
+
+
+app = QtGui.QApplication([])
+window = QtGui.QMainWindow()
+main_widget = QtGui.QWidget()
+window.setCentralWidget(main_widget)
+window.show()
+
+pxr = main_widget.devicePixelRatioF()
+
+# screen_num = app.desktop().screenNumber()
+# screen = app.screens()[screen_num]
+
+screen = app.screenAt(main_widget.geometry().center())
+
+name = screen.name()
+size = screen.size()
+geo = screen.availableGeometry()
+phydpi = screen.physicalDotsPerInch()
+logdpi = screen.logicalDotsPerInch()
+
+print(
+    # f'screen number: {screen_num}\n',
+    f'screen name: {name}\n'
+    f'screen size: {size}\n'
+    f'screen geometry: {geo}\n\n'
+    f'devicePixelRationF(): {pxr}\n'
+    f'physical dpi: {phydpi}\n'
+    f'logical dpi: {logdpi}\n'
+)
+
+print('-'*50)
+
+screen = app.primaryScreen()
+
+name = screen.name()
+size = screen.size()
+geo = screen.availableGeometry()
+phydpi = screen.physicalDotsPerInch()
+logdpi = screen.logicalDotsPerInch()
+
+print(
+    # f'screen number: {screen_num}\n',
+    f'screen name: {name}\n'
+    f'screen size: {size}\n'
+    f'screen geometry: {geo}\n\n'
+    f'devicePixelRationF(): {pxr}\n'
+    f'physical dpi: {phydpi}\n'
+    f'logical dpi: {logdpi}\n'
+)
+
+
+# app-wide font
+font = QtGui.QFont("Hack")
+# use pixel size to be cross-resolution compatible?
+font.setPixelSize(6)
+
+
+fm = QtGui.QFontMetrics(font)
+fontdpi = fm.fontDpi()
+font_h = fm.height()
+
+string = '10000'
+str_br = fm.boundingRect(string)
+str_w = str_br.width()
+
+
+print(
+    # f'screen number: {screen_num}\n',
+    f'font dpi: {fontdpi}\n'
+    f'font height: {font_h}\n'
+    f'string bounding rect: {str_br}\n'
+    f'string width : {str_w}\n'
+)