Add Particles drawing mode

Related: #7

data/io.github.fsobolev.Cavalier.gschema.xml

@@ -26,6 +26,7 @@
 			<choices>
 				<choice value="wave"/>
 				<choice value="levels"/>
+				<choice value="particles"/>
 				<choice value="bars"/>
 			</choices>
 			<default>"wave"</default>

src/draw_functions.py

@@ -84,6 +84,17 @@ def levels(sample, cr, width, height, colors, offset, radius):
                 step - offset_px * 2, height / 10 - offset_px * 2, radius)
     cr.fill()
 
+def particles(sample, cr, width, height, colors, offset, radius):
+    set_source(cr, height, colors)
+    ls = len(sample)
+    step = width / ls
+    offset_px = step * offset / 100
+    for i in range(ls):
+        draw_element(cr, step * i + offset_px, \
+            height * 0.9 - height * 0.9 * sample[i] + offset_px, step - offset_px * 2, \
+            height / 10 - offset_px * 2, radius)
+    cr.fill()
+
 def bars(sample, cr, width, height, colors, offset):
     set_source(cr, height, colors)
     ls = len(sample)

src/drawing_area.py

@@ -31,7 +31,7 @@
 from gi.repository import Gtk, GObject
 from threading import Thread
 from cavalier.cava import Cava
-from cavalier.draw_functions import wave, levels, bars
+from cavalier.draw_functions import wave, levels, particles, bars
 from cavalier.settings import CavalierSettings
 
 class CavalierDrawingArea(Gtk.DrawingArea):
@@ -93,11 +93,12 @@ def draw_func(self, area, cr, width, height, data, n):
             elif self.draw_mode == 'levels':
                 levels(self.cava_sample, cr, width, height, self.colors, \
                     self.offset, self.roundness)
+            elif self.draw_mode == 'particles':
+                particles(self.cava_sample, cr, width, height, self.colors, \
+                    self.offset, self.roundness)
             elif self.draw_mode == 'bars':
                 bars(self.cava_sample, cr, width, height, self.colors, \
                     self.offset)
-            else:
-                print(f'Error: Unknown drawing mode "{self.draw_mode}"')
 
     def redraw(self):
         self.queue_draw()

src/preferences_window.py

@@ -73,6 +73,14 @@ def create_cavalier_page(self):
         self.levels_row.set_activatable_widget(self.levels_check_btn)
         self.cavalier_mode_group.add(self.levels_row)
 
+        self.particles_row = Adw.ActionRow.new()
+        self.particles_row.set_title(_('Particles'))
+        self.particles_check_btn = Gtk.CheckButton.new()
+        self.particles_check_btn.set_group(self.wave_check_btn)
+        self.particles_row.add_prefix(self.particles_check_btn)
+        self.particles_row.set_activatable_widget(self.particles_check_btn)
+        self.cavalier_mode_group.add(self.particles_row)
+
         self.bars_row = Adw.ActionRow.new()
         self.bars_row.set_title(_('Bars'))
         self.bars_check_btn = Gtk.CheckButton.new()
@@ -294,9 +302,9 @@ def create_colors_page(self):
         self.bg_color_btns = []
 
     def load_settings(self):
-        (self.wave_check_btn, self.levels_check_btn, self.bars_check_btn)[ \
-            ('wave', 'levels', 'bars').index(self.settings.get('mode')) \
-            ].set_active(True)
+        (self.wave_check_btn, self.levels_check_btn, self.particles_check_btn, \
+            self.bars_check_btn)[ ('wave', 'levels', 'particles', \
+            'bars').index(self.settings.get('mode')) ].set_active(True)
         self.pref_margin_scale.set_value(self.settings.get('margin'))
         self.pref_offset_scale.set_value(self.settings.get('items-offset'))
         self.pref_roundness_scale.set_value(round(self.settings.get('items-roundness') / 50.0, 2))
@@ -333,6 +341,8 @@ def load_settings(self):
     def bind_settings(self):
         self.wave_row.connect('activated', self.on_save, 'mode', 'wave')
         self.levels_row.connect('activated', self.on_save, 'mode', 'levels')
+        self.particles_row.connect('activated', self.on_save, 'mode', \
+            'particles')
         self.bars_row.connect('activated', self.on_save, 'mode', 'bars')
         self.pref_margin_scale.connect('value-changed', self.on_save, \
             'margin', self.pref_margin_scale.get_value)