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ISO Selector on header bar, WIP EV calculator class

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This commit is contained in:
Daniele Verducci 2024-04-24 08:48:03 +02:00
parent 47731ad887
commit a0fbde0596
5 changed files with 43 additions and 7 deletions
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15
src/ev_calculator.py
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@ -1,9 +1,24 @@
from math import log
'''
This class does all the required math. It is based on the Wikipedia page
https://en.wikipedia.org/wiki/Exposure_value
(N^2)/t = L*S/K
where:
N is the relative aperture (f-number)
t is the exposure time ("shutter speed") in seconds
L is the average scene luminance
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?
def luxToEV(lux: float) -> float:
# Wikipedia (https://en.wikipedia.org/wiki/Exposure_value#EV_as_a_measure_of_luminance_and_illuminance)
# says E = 2.5 * (2^EV), so the inverse is EV = ln(2*E/5)/ln(2)
return log(2*lux/5, 2)

2
src/widgets/aperture_priority_page.ui
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@ -29,7 +29,7 @@
</child>
<child>
<object class="GtkLabel" id="time-priority-aperture-label">
<property name="label" translatable="no">f/60</property>
<property name="label" translatable="no">--s</property>
<style>
<class name="lumos-big-result"/>
</style>

2
src/widgets/time_priority_page.ui
View File

@ -29,7 +29,7 @@
</child>
<child>
<object class="GtkLabel" id="time-priority-aperture-label">
<property name="label" translatable="no">f/11</property>
<property name="label" translatable="no">f/--</property>
<style>
<class name="lumos-big-result"/>
</style>

2
src/window.py
View File

@ -38,8 +38,6 @@ class LumosWindow(Adw.ApplicationWindow):
def onSensorRead(self, value: float, unit: str):
# Called when the light value changed
print("Read {} {}".format(value, unit))
if self.lux_label:
self.lux_label.set_label("{:.0f} {}".format(value, unit))

29
src/window.ui
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@ -9,6 +9,26 @@
<object class="AdwToolbarView">
<child type="top">
<object class="AdwHeaderBar" id="header_bar">
<child type="start">
<!-- ISO Selector in header bar (left) -->
<object class="GtkDropDown" id="iso-dropdown">
<property name="model">
<object class="GtkStringList">
<items>
<item translatable="no">ISO 50</item>
<item translatable="no">ISO 100</item>
<item translatable="no">ISO 200</item>
<item translatable="no">ISO 400</item>
<item translatable="no">ISO 800</item>
<item translatable="no">ISO 1600</item>
<item translatable="no">ISO 3200</item>
<item translatable="no">ISO 6400</item>
</items>
</object>
</property>
<property name="selected">1</property> <!-- ISO 100 -->
</object>
</child>
<child type="end">
<object class="GtkMenuButton">
<property name="primary">True</property>
@ -31,7 +51,7 @@
<!-- Aperture priority page -->
<object class="AdwViewStackPage" id="aperture-priority-page">
<property name="name">aperture-priority-page</property>
<property name="title" translatable="true">Aperture priority</property>
<property name="title" translatable="true">Aperture</property>
<property name="icon-name">camera-shutter-symbolic</property>
<property name="use-underline">true</property>
<property name="child">
@ -45,7 +65,7 @@
<child>
<object class="AdwViewStackPage" id="time-priority-page">
<property name="name">time-priority-page</property>help
<property name="title" translatable="true">Time priority</property>
<property name="title" translatable="true">Time</property>
<property name="icon-name">camera-timer-symbolic</property>
<property name="use-underline">true</property>
<property name="child">
@ -118,9 +138,12 @@
<child>
<object class="AdwViewSwitcher" id="switcher_title">
<property name="stack">stack</property>
<property name="margin-bottom">8</property>
<property name="margin-start">2</property>
<property name="margin-end">2</property>
</object>
</child>
</object>
</property>
</object>