fix DpiAwareFont default size calculation

piker/ui/_style.py

@@ -182,7 +182,7 @@ class DpiAwareFont:
         # always going to hit that error in range mapping from inches:
         # float to px size: int.
         self._font_inches = inches
-        font_size = math.floor(inches * dpi)
+        font_size = math.floor(inches * pdpi)
 
         log.debug(
             f"screen:{screen.name()}\n"

pyproject.toml

@@ -77,6 +77,9 @@ dependencies = [
     "trio-typing>=0.10.0",
     "numba>=0.61.0",
     "pyvnc",
+    "pyqt6>=6.8.0",
+    "pyqtgraph>=0.12.3",
+    "qdarkstyle>=3.2.3",
 ]
 
 [project.optional-dependencies]

tests/test_dpi_font.py

@@ -0,0 +1,18 @@
+from PyQt6 import QtGui
+from piker.ui._style import DpiAwareFont
+
+class MockScreen:
+    def physicalDotsPerInch(self):
+        return 169  # example HiDPI
+    def logicalDotsPerInch(self):
+        return 96
+    def name(self):
+        return "MockScreen"
+
+# create font instance
+font = DpiAwareFont()
+
+# pass the mock screen to configure_to_dpi
+font.configure_to_dpi(screen=MockScreen())
+
+print("Computed pixel size:", font.px_size)

uv.lock

@@ -811,7 +811,10 @@ dependencies = [
     { name = "polars-fuzzy-match" },
     { name = "pyarrow" },
     { name = "pygments" },
+    { name = "pyqt6" },
+    { name = "pyqtgraph" },
     { name = "pyvnc" },
+    { name = "qdarkstyle" },
     { name = "rapidfuzz" },
     { name = "rich" },
     { name = "tomli" },
@@ -866,9 +869,12 @@ requires-dist = [
     { name = "polars-fuzzy-match", specifier = ">=0.1.5" },
     { name = "pyarrow", specifier = ">=18.0.0" },
     { name = "pygments", specifier = ">=2.16.1,<3.0.0" },
+    { name = "pyqt6", specifier = ">=6.8.0" },
     { name = "pyqt6", marker = "extra == 'uis'", specifier = ">=6.7.0,<7.0.0" },
+    { name = "pyqtgraph", git = "https://github.com/pikers/pyqtgraph.git" },
     { name = "pyqtgraph", marker = "extra == 'uis'", git = "https://github.com/pikers/pyqtgraph.git" },
     { name = "pyvnc", git = "https://github.com/regulad/pyvnc.git" },
+    { name = "qdarkstyle", specifier = ">=3.2.3" },
     { name = "qdarkstyle", marker = "extra == 'uis'", specifier = ">=3.0.2,<4.0.0" },
     { name = "rapidfuzz", specifier = ">=3.5.2,<4.0.0" },
     { name = "rapidfuzz", marker = "extra == 'uis'", specifier = ">=3.2.0,<4.0.0" },