add more commands

pattern.py

@@ -21,21 +21,23 @@ def constant(target, arg):
 
 
 def add(target, arg):
-    res = target + arg
-    if res > 255:
-        res = 255
-    elif res < 0:
-        res = 0
-    return res
+    return target + arg
 
 
 def sub(target, arg):
-    res = target - arg
-    if res > 255:
-        res = 255
-    elif res < 0:
-        res = 0
-    return res
+    return target - arg
+
+
+def mult(target, arg):
+    return target * arg
+
+
+def div(target, arg):
+    return target / arg
+
+
+def mod(target, arg):
+    return target % arg
 
 
 def rand(target, arg):
@@ -63,8 +65,11 @@ def apply(targets, args, func):
 this.instructions = {
     "CONSTANT": constant,
     "ADD": add,
-    "SUB": sub,
-    "RAND": rand
+    "SUBTRACT": sub,
+    "MULTIPLY": mult,
+    "DIVIDE": div,
+    "MODULO": mod,
+    "RANDOM": rand
 }
 
 
@@ -89,6 +94,18 @@ def pat(index, tick, previous_values):
         this.values["g"] = 0
         this.values["b"] = 0
         this.values["stack"] = 0
+        if r > 255:
+            r = 255
+        elif r < 0:
+            r = 0
+        if g > 255:
+            g = 255
+        elif g < 0:
+            g = 0
+        if b > 255:
+            b = 255
+        elif b < 0:
+            b = 0
         return (r, g, b)
     else:
         return default(index, tick)