From 57e5ea1f424ea2567e10c3945d9273a92a547332 Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@martin-laptop.lan>
Date: Tue, 15 May 2018 22:12:09 +0100
Subject: Basic should be working

---
 unicorn_hat_sim.py | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 unicorn_hat_sim.py

(limited to 'unicorn_hat_sim.py')

diff --git a/unicorn_hat_sim.py b/unicorn_hat_sim.py
new file mode 100644
index 0000000..9d7d1a0
--- /dev/null
+++ b/unicorn_hat_sim.py
@@ -0,0 +1,123 @@
+import sys
+import colorsys
+import pygame.gfxdraw
+
+try:
+    import pygame
+except ImportError:
+    print("To simulate a unicorn HAT on your computer, please pip install pygame")
+
+class UnicornHatSim(object):
+    def __init__(self, width, height, rotation_offset = 0):
+        # Compat with old library
+        self.AUTO = None
+        self.PHAT = None
+            
+        # Set some defaults
+        self.rotation_offset = rotation_offset
+        self.rotation(0)
+        self.pixels = [(0, 0, 0)] * width * height
+        self.pixel_size = 15
+        self.width = width
+        self.height = height
+        self.window_width = width * self.pixel_size
+        self.window_height = height * self.pixel_size
+
+        # Init pygame and off we go
+        pygame.init()
+        pygame.display.set_caption("Unicorn HAT simulator")
+        self.screen = pygame.display.set_mode([self.window_width, self.window_height])
+        self.clear()
+
+    def set_pixel(self, x, y, r, g, b):
+        i = (x * self.width) + y
+        self.pixels[i] = [int(r), int(g), int(b)]
+
+    def get_pixels(self):
+        """Returns a 2d array of 3-tuple RGB values repsenting pixel colours """
+        px = []
+        for y in range(self.height):
+            row = []
+            for x in range(self.width):
+                i = (x * self.width) + y
+                row.append(self.pixels[i])
+            px.append(row)
+        return px
+
+    def draw(self):
+        for event in pygame.event.get(): # User did something
+            if event.type == pygame.QUIT:
+                print("Exiting...")
+                sys.exit()
+
+        for x in range(self.width):
+            for y in range(self.height):
+                self.draw_led(x, y)
+
+    def show(self):
+        self.clear()
+        self.draw()
+        pygame.display.flip()
+
+    def draw_led(self, x, y):
+        self.draw_gfxcircle(x,y)
+
+    def draw_gfxcircle(self, x, y):
+        p = self.pixel_size
+        w_x = int(x * p + self.pixel_size / 2)
+        w_y = int((self.height - 1 - y) * p + self.pixel_size / 2)
+        r = int(self.pixel_size / 4)
+        color = self.pixels[self.index(x, y)]
+        pygame.gfxdraw.aacircle(self.screen, w_x, w_y, r, color)
+        pygame.gfxdraw.filled_circle(self.screen, w_x, w_y, r, color)
+
+    def get_shape(self):
+        return (self.width, self.height)
+
+    def brightness(self, *args):
+        pass
+
+    def rotation(self, r):
+        self._rotation = int(round(r/90.0)) % 3
+
+    def clear(self):
+        self.screen.fill((0, 0, 0))
+
+    def get_rotation(self):
+        return self._rotation * 90
+
+    def set_layout(self, *args):
+        pass
+
+    def set_pixel_hsv(self, x, y, h, s=1.0, v=1.0):
+        r, g, b = [int(n*255) for n in colorsys.hsv_to_rgb(h, s, v)]
+        self.set_pixel(x, y, r, g, b)
+
+    def off(self):
+        print("Closing window")
+        pygame.quit()
+
+    def index(self, x, y):
+        # Offset to match device rotation
+        rot = (self.get_rotation() + self.rotation_offset) % 360
+
+        if rot == 0:
+            xx = x
+            yy = y
+        elif rot == 90:
+            xx = self.height - 1 - y
+            yy = x
+        elif rot == 180:
+            xx = self.width - 1 - x
+            yy = self.height - 1 - y
+        elif rot == 270:
+            xx = y
+            yy = self.width - 1 - x
+        return (xx * self.width) + yy
+
+# SD hats works as expected
+unicornhat = UnicornHatSim(8,8)
+unicornphat = UnicornHatSim(8, 4)
+
+# Unicornhat HD seems to be the other way around (not that there's anything wrong with that), so we rotate it 180 deg
+unicornhathd = UnicornHatSim(16, 16, 180)
\ No newline at end of file
-- 
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