Add code and spritsheet

Author: dastels

CircuitPython_Scrolling_Clouds/code.py

@@ -0,0 +1,138 @@
+"""
+This test will initialize the display using displayio and draw a solid green
+background, a smaller purple rectangle, and some yellow text.
+"""
+
+#pylint:disable=redefined-outer-name
+import time
+from random import seed, randint
+import board
+import displayio
+from adafruit_st7789 import ST7789
+import adafruit_imageload
+
+# Sprite cell values
+EMPTY = 0
+LEFT = 1
+MIDDLE = 2
+RIGHT = 3
+
+# These constants determine what happens when tiles are shifted.
+# if randint(1, 10) > the value, the thing happens
+
+# The chance a new cloud will enter
+CHANCE_OF_NEW_CLOUD = 4
+
+# The chance an existing cloud gets extended
+CHANCE_OF_EXTENDING_A_CLOUD = 5
+
+# Global variables
+display = None
+tilegrid = None
+
+seed(int(time.monotonic()))
+
+def make_display():
+    """Set up the display support.
+    Return the Display object.
+    """
+    spi = board.SPI()
+    while not spi.try_lock():
+        pass
+    spi.configure(baudrate=24000000) # Configure SPI for 24MHz
+    spi.unlock()
+    tft_cs = board.D10
+    tft_dc = board.D7
+
+    displayio.release_displays()
+    display_bus = displayio.FourWire(spi, command=tft_dc, chip_select=tft_cs, reset=board.D9)
+
+    return ST7789(display_bus, width=240, height=240, rowstart=80)
+
+def make_tilegrid():
+    """Construct and return the tilegrid."""
+    group = displayio.Group(max_size=10)
+
+    sprite_sheet, palette = adafruit_imageload.load("/tilesheet.bmp",
+                                                    bitmap=displayio.Bitmap,
+                                                    palette=displayio.Palette)
+    grid = displayio.TileGrid(sprite_sheet, pixel_shader=palette,
+                              width=16, height=10,
+                              tile_height=24, tile_width=16,
+                              default_tile=EMPTY)
+    group.append(grid)
+    display.show(group)
+    return grid
+
+def evaluate_position(row, col):
+    """Return how long of a cloud is placable at the given location.
+    :param row: the tile row (0-9)
+    :param col: the tile column (0-14)
+    """
+    if tilegrid[col, row] != EMPTY or tilegrid[col + 1, row] != EMPTY:
+        return 0
+    end_col = col + 1
+    while end_col < 16 and tilegrid[end_col, row] == EMPTY:
+        end_col += 1
+    return min([4, end_col - col])
+
+def seed_clouds(number_of_clouds):
+    """Create the initial clouds so it doesn't start empty"""
+    for _ in range(number_of_clouds):
+        while True:
+            row = randint(0, 9)
+            col = randint(0,14)
+            cloud_length = evaluate_position(row, col)
+            if cloud_length > 0:
+                break
+        l = randint(1, cloud_length)
+        tilegrid[col, row] = LEFT
+        for _ in range(l - 2):
+            col += 1
+            tilegrid[col, row] = MIDDLE
+        tilegrid[col + 1, row] = RIGHT
+
+def slide_tiles():
+    """Move the tilegrid to the left, one pixel at a time, a full time width"""
+    for _ in range(16):
+        tilegrid.x -= 1
+        display.refresh_soon()
+        display.wait_for_frame()
+
+def shift_tiles():
+    """Move tiles one spot to the left, and reset the tilegrid's position"""
+    for row in range(10):
+        for col in range(15):
+            tilegrid[col, row] = tilegrid[col + 1, row]
+        tilegrid[15, row] = EMPTY
+    tilegrid.x = 0
+
+def extend_clouds():
+    """Extend any clouds on the right edge, either finishing them with a right
+    end or continuing them with a middle piece
+    """
+    for row in range(10):
+        if tilegrid[14, row] == LEFT or tilegrid[14, row] == MIDDLE:
+            if randint(1, 10) > CHANCE_OF_EXTENDING_A_CLOUD:
+                tilegrid[15, row] = MIDDLE
+            else:
+                tilegrid[15, row] = RIGHT
+
+def add_cloud():
+    """Maybe add a new cloud on the right at a randon open row"""
+    if randint(1, 10) > CHANCE_OF_NEW_CLOUD:
+        while True:
+            row = randint(0, 9)
+            if tilegrid[14, row] == EMPTY and tilegrid[15, row] == EMPTY:
+                break
+        tilegrid[15, row] = LEFT
+
+display = make_display()
+tilegrid = make_tilegrid()
+seed_clouds(5)
+
+while True:
+    slide_tiles()
+    shift_tiles()
+    extend_clouds()
+    add_cloud()