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Implemented AP and TP calculations

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This commit is contained in:
Daniele Verducci 2024-05-01 10:34:27 +02:00
parent 6ef5ad15f7
commit 4f79f51917
5 changed files with 68 additions and 9 deletions
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9
src/ev_calculator.py
View File

@ -11,10 +11,12 @@ where:
S is the ISO arithmetic speed
K is the reflected-light meter calibration constant
'''
class EVCalculator:
# K is the reflected-light meter calibration constant (unit: cd s/m2 ISO)
# (https://en.wikipedia.org/wiki/Light_meter#Calibration_constants)
K = 12.5 # TODO: Add to settings?
K = 12.5
class EVCalculator:
def luxToEV(lux: float) -> float:
# Wikipedia (https://en.wikipedia.org/wiki/Light_meter#Exposure_equations)
@ -22,8 +24,9 @@ class EVCalculator:
return log(2*lux/5, 2)
def calcShutterSpeed(isoSpeed: int, lux: float, aperture: float):
return ((aperture^2)*K)/(lux*isoSpeed)
return (aperture*aperture*K)/(lux*isoSpeed)
def calcAperture(isoSpeed: int, lux: float, shutterSpeed: float):
# shutterSpeed is in seconds
return sqrt(lux*isoSpeed*shutterSpeed/K)

24
src/widgets/aperture_priority_page.py
View File

@ -19,13 +19,37 @@
from gi.repository import Adw
from gi.repository import Gtk
from .ev_calculator import EVCalculator
@Gtk.Template(resource_path='/eu/ichibi/Lumos/widgets/aperture_priority_page.ui')
class AperturePriorityPage(Gtk.Box):
__gtype_name__ = 'AperturePriorityPage'
# Values of aperture dropdown entries defined in the .ui file
aperture_priority_speed_dropdown_values = [
1/32,
1/22,
1/16,
1/11,
1/8,
1/5.6,
1/4,
1/2.8,
1/2,
1/1.4
]
# Widgets
aperture_priority_aperture_dropdown = Gtk.Template.Child()
aperture_priority_time_label = Gtk.Template.Child()
def onValuesChanged(self, isoSpeed: int, sensorValue: float, sensorUnit: str):
# Check the unit is absolute ("lux")
if sensorUnit != "lux":
return
apertureValue = self.aperture_priority_speed_dropdown_values[self.aperture_priority_aperture_dropdown.get_selected()]
shutterSpeed = EVCalculator.calcShutterSpeed(isoSpeed, sensorValue, apertureValue)
# TODO: Round shutter speed value to nearest existing value and set label color to red if outside 1 stop range
self.aperture_priority_time_label.set_label("f/ {:.2f}".format(shutterSpeed))

4
src/widgets/aperture_priority_page.ui
View File

@ -28,7 +28,7 @@
</object>
</child>
<child>
<object class="GtkLabel" id="time-priority-aperture-label">
<object class="GtkLabel" id="aperture_priority_time_label">
<property name="label" translatable="no">--s</property>
<style>
<class name="lumos-big-result"/>
@ -43,7 +43,7 @@
</object>
</child>
<child>
<object class="GtkDropDown" id="aperture-priority-speed-dropdown">
<object class="GtkDropDown" id="aperture_priority_aperture_dropdown">
<property name="model">
<object class="GtkStringList">
<items>

32
src/widgets/time_priority_page.py
View File

@ -19,13 +19,45 @@
from gi.repository import Adw
from gi.repository import Gtk
from .ev_calculator import EVCalculator
@Gtk.Template(resource_path='/eu/ichibi/Lumos/widgets/time_priority_page.ui')
class TimePriorityPage(Gtk.Box):
__gtype_name__ = 'TimePriorityPage'
# Values of time dropdown entries defined in the .ui file
time_priority_speed_dropdown_values = [
1/4000,
1/2000,
1/1000,
1/500,
1/250,
1/125,
1/60,
1/30,
1/15,
1/8,
1/4,
1/2,
1,
2,
4,
8,
15,
30
]
# Widgets
time_priority_speed_dropdown = Gtk.Template.Child()
time_priority_aperture_label = Gtk.Template.Child()
def onValuesChanged(self, isoSpeed: int, sensorValue: float, sensorUnit: str):
# Check the unit is absolute ("lux")
if sensorUnit != "lux":
return
shutterSpeed = self.time_priority_speed_dropdown_values[self.time_priority_speed_dropdown.get_selected()]
apertureValue = EVCalculator.calcAperture(isoSpeed, sensorValue, shutterSpeed)
# TODO: Round aperture value to nearest existing value and set label color to red if outside 1 stop range
self.time_priority_aperture_label.set_label("f/ {:.2f}".format(apertureValue))

4
src/widgets/time_priority_page.ui
View File

@ -28,7 +28,7 @@
</object>
</child>
<child>
<object class="GtkLabel" id="time-priority-aperture-label">
<object class="GtkLabel" id="time_priority_aperture_label">
<property name="label" translatable="no">f/--</property>
<style>
<class name="lumos-big-result"/>
@ -43,7 +43,7 @@
</object>
</child>
<child>
<object class="GtkDropDown" id="time-priority-speed-dropdown">
<object class="GtkDropDown" id="time_priority_speed_dropdown">
<property name="model">
<object class="GtkStringList">
<items>