Added simple effect system

ledd/effects/baseeffect.py

@@ -13,3 +13,11 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+class BaseEffect(object):
+    """
+    This class only defines default meta-data for effects.
+    """
+    name = "BaseEffect"
+    version = "0.1"
+    author = "LeDD-Freaks"

ledd/effects/fadeeffect.py

@@ -0,0 +1,18 @@
+from ledd.effects.generatoreffect import GeneratorEffect
+import spectra
+
+
+class FadeEffect(GeneratorEffect):
+    author = "LeDD-Freaks"
+    version = "0.1"
+
+    name = "Fade Effect"
+    description = "Fades through the HSV color wheel"
+
+    def execute(self):
+        scale = spectra.scale([spectra.hsv(0.0, 1.0, 1.0), spectra.hsv(360, 1.0, 1.0)]).domain([0, 20000])
+
+        i = 0
+        while True:
+            yield scale(i)
+            i = (i + 1) % 20000

ledd/effects/generatoreffect.py

@@ -0,0 +1,30 @@
+
+from ledd.effects.baseeffect import BaseEffect
+from spectra import Color
+
+
+class GeneratorEffect(BaseEffect):
+    """
+    This is a base class for simple effects.
+    It should yield a new color on each execution.
+    """
+
+    def __init__(self):
+        """
+        Do not override, use setup instead.
+        """
+        self.generator = self.execute()
+
+    def setup(self):
+        pass
+
+    def execute_internal(self):
+        c = next(self.generator)
+        assert isinstance(c, Color)
+        return c
+
+    def execute(self):
+        pass
+
+    def tear_down(self):
+        pass