Initial commit

palette.py

@@ -0,0 +1,60 @@
+from collections import deque
+
+import pygame
+
+from cycle import Cycle
+
+pcolumns = 13
+prows = 20
+psize = 16
+pmargin = 5
+pwidth = ((psize + pmargin) * pcolumns) + pmargin
+pheight = ((psize + pmargin) * prows) + pmargin
+
+# NOTE(m): This magic number comes from the original Deluxe Paint source code
+# file CCYCLE.C line number 19
+# The division by two comes from our FPS of 30, which is half of 60 fps,
+# the modern LCD equivalent of 60 Hz on an old school CRT.
+# This seems to most accurately recreate the speed as measured in Deluxe Paint
+# in DOSBox.
+ONE_PER_TICK = 16384 / 2
+
+
+class Palette:
+    def __init__(self, colors, cycles):
+        self.colors = [tuple(color) for color in colors]
+        self.basecolors = [color for color in self.colors]
+        self.surface = pygame.Surface((pwidth, pheight), 0, 8)
+        self.surface.set_palette(self.colors)
+
+        # Process cycles
+        self.cycles = [Cycle(cycle['rate'],
+                             cycle['reverse'],
+                             cycle['low'],
+                             cycle['high'])
+                       for cycle in cycles
+                       if cycle['rate'] > 0]
+
+        for index in range(256):
+            rownumber = int(index / pcolumns)
+            colnumber = index % pcolumns
+            destrect = pygame.Rect(0, 0, psize, psize)
+
+            pygame.draw.rect(
+                self.surface,
+                index,
+                destrect.move(pmargin + (colnumber * (psize + pmargin)),
+                              (pmargin + rownumber * (psize + pmargin)))
+            )
+
+    def cycle(self):
+        for cycle in self.cycles:
+            cycle.count += cycle.rate
+            if cycle.count >= ONE_PER_TICK:
+                cycle.count -= ONE_PER_TICK
+                cyclecolors = deque(self.colors[cycle.low:cycle.high + 1])
+                if cycle.reverse == 2:
+                    cyclecolors.rotate(-1)
+                else:
+                    cyclecolors.rotate(1)
+                self.colors[cycle.low:cycle.high + 1] = cyclecolors