Clue Slideshow Library

src/adafruit_circuitplayground/express.py

@@ -48,7 +48,6 @@ def __init__(self):
             "shake": False,
         }
         self.__debug_mode = False
-        self.__abs_path_to_code_file = ""
         self.pixels = Pixel(self.__state, self.__debug_mode)
 
     @property
@@ -169,7 +168,7 @@ def play_file(self, file_name):
         telemetry_py.send_telemetry(TelemetryEvent.CPX_API_PLAY_FILE)
         file_name = utils.remove_leading_slashes(file_name)
         abs_path_parent_dir = os.path.abspath(
-            os.path.join(self.__abs_path_to_code_file, os.pardir)
+            os.path.join(utils.abs_path_to_user_file, os.pardir)
         )
         abs_path_wav_file = os.path.normpath(
             os.path.join(abs_path_parent_dir, file_name)

src/base_circuitpython/base_cp_constants.py

@@ -4,5 +4,13 @@
 
 CLUE_PIN = "D18"
 
+CLUE = "CLUE"
+BASE_64 = "display_base64"
 IMG_DIR_NAME = "img"
 SCREEN_HEIGHT_WIDTH = 240
+
+BMP_IMG = "BMP"
+
+BMP_IMG_ENDING = ".bmp"
+
+NO_VALID_IMGS_ERR = "No valid images"

src/clue/adafruit_slideshow.py

@@ -0,0 +1,312 @@
+from PIL import Image
+
+import os
+import base64
+from io import BytesIO
+from base_circuitpython import base_cp_constants as CONSTANTS
+import time
+import collections
+from random import shuffle
+from common import utils
+
+# taken from adafruit
+# https://github.com/adafruit/Adafruit_CircuitPython_Slideshow/blob/master/adafruit_slideshow.py
+
+
+class PlayBackOrder:
+    """Defines possible slideshow playback orders."""
+
+    # pylint: disable=too-few-public-methods
+    ALPHABETICAL = 0
+    """Orders by alphabetical sort of filenames"""
+
+    RANDOM = 1
+    """Randomly shuffles the images"""
+    # pylint: enable=too-few-public-methods
+
+
+class PlayBackDirection:
+    """Defines possible slideshow playback directions."""
+
+    # pylint: disable=too-few-public-methods
+    BACKWARD = -1
+    """The next image is before the current image. When alphabetically sorted, this is towards A."""
+
+    FORWARD = 1
+    """The next image is after the current image. When alphabetically sorted, this is towards Z."""
+    # pylint: enable=too-few-public-methods
+
+
+# custom
+class SlideShow:
+    def __init__(
+        self,
+        display,
+        backlight_pwm=None,
+        *,
+        folder=".",
+        order=PlayBackOrder.ALPHABETICAL,
+        loop=True,
+        dwell=3,
+        fade_effect=True,
+        auto_advance=True,
+        direction=PlayBackDirection.FORWARD,
+    ):
+        self._BASE_DWELL = 0.3
+        self._BASE_DWELL_DARK = 0.7
+        self._NO_FADE_TRANSITION_INCREMENTS = 18
+
+        self.auto_advance = auto_advance
+        """Enable auto-advance based on dwell time.  Set to ``False`` to manually control."""
+
+        self.loop = loop
+        """Specifies whether to loop through the images continuously or play through the list once.
+        ``True`` will continue to loop, ``False`` will play only once."""
+
+        self.fade_frames = 8
+        """Whether to include the fade effect between images. ``True`` tells the code to fade the
+           backlight up and down between image display transitions. ``False`` maintains max
+           brightness on the backlight between image transitions."""
+
+        self.dwell = self._BASE_DWELL + dwell
+        """The number of seconds each image displays, in seconds."""
+
+        self.direction = direction
+        """Specify the playback direction.  Default is ``PlayBackDirection.FORWARD``.  Can also be
+        ``PlayBackDirection.BACKWARD``."""
+
+        self.advance = self._advance_with_fade
+        """Displays the next image. Returns True when a new image was displayed, False otherwise.
+        """
+
+        # assign new advance method if fade is disabled
+        if not fade_effect:
+            self.advance = self._advance_no_fade
+
+        self._img_start = None
+
+        self.brightness = 1.0
+
+        # blank screen for start
+        self._curr_img_handle = Image.new(
+            "RGBA", (CONSTANTS.SCREEN_HEIGHT_WIDTH, CONSTANTS.SCREEN_HEIGHT_WIDTH)
+        )
+
+        # if path is relative, this makes sure that
+        # it's relative to the users's code file
+        abs_path_parent_dir = os.path.abspath(
+            os.path.join(utils.abs_path_to_user_file, os.pardir)
+        )
+        abs_path_folder = os.path.normpath(os.path.join(abs_path_parent_dir, folder))
+
+        self.folder = abs_path_folder
+
+        # get files within specified directory
+        self.dirs = os.listdir(self.folder)
+
+        self._order = order
+        self._curr_img = ""
+
+        # load images into main queue
+        self._load_images()
+
+        # show the first working image
+        self.advance()
+
+    @property
+    def current_image_name(self):
+        """Returns the current image name."""
+        return self._curr_img
+
+    @property
+    def order(self):
+        """Specifies the order in which the images are displayed. Options are random (``RANDOM``) or
+        alphabetical (``ALPHABETICAL``). Default is ``RANDOM``."""
+        return self._order
+
+    @order.setter
+    def order(self, order):
+        if order not in [PlayBackOrder.ALPHABETICAL, PlayBackOrder.RANDOM]:
+            raise ValueError("Order must be either 'RANDOM' or 'ALPHABETICAL'")
+
+        self._order = order
+        self._load_images()
+
+    @property
+    def brightness(self):
+        """Brightness of the backlight when an image is displaying. Clamps to 0 to 1.0"""
+        return self._brightness
+
+    @brightness.setter
+    def brightness(self, brightness):
+        if brightness < 0:
+            brightness = 0
+        elif brightness > 1.0:
+            brightness = 1.0
+        self._brightness = brightness
+
+    def update(self):
+        """Updates the slideshow to the next image."""
+        now = time.monotonic()
+        if not self.auto_advance or now - self._img_start < self.dwell:
+            return True
+
+        return self.advance()
+
+    def _get_next_img(self):
+
+        # handle empty queue
+        if not len(self.pic_queue):
+            if self.loop:
+                self._load_images()
+            else:
+                return ""
+
+        if self.direction == PlayBackDirection.FORWARD:
+            return self.pic_queue.popleft()
+        else:
+            return self.pic_queue.pop()
+
+    def _load_images(self):
+        dir_imgs = []
+        for d in self.dirs:
+            try:
+                new_path = os.path.join(self.folder, d)
+
+                # only add bmp imgs
+                if os.path.splitext(new_path)[1] == CONSTANTS.BMP_IMG_ENDING:
+                    dir_imgs.append(new_path)
+            except Image.UnidentifiedImageError as e:
+                continue
+
+        if not len(dir_imgs):
+            raise RuntimeError(CONSTANTS.NO_VALID_IMGS_ERR)
+
+        if self._order == PlayBackOrder.RANDOM:
+            shuffle(dir_imgs)
+        else:
+            dir_imgs.sort()
+
+        # convert list to queue
+        # (must be list beforehand for potential randomization)
+        self.pic_queue = collections.deque(dir_imgs)
+
+    def _advance_with_fade(self):
+
+        old_img = self._curr_img_handle
+        advance_sucessful = False
+
+        while not advance_sucessful:
+            new_path = self._get_next_img()
+            if new_path == "":
+                return False
+
+            try:
+                new_img = Image.open(new_path)
+
+                new_img = new_img.convert("RGBA")
+                new_img.putalpha(255)
+
+                new_img = new_img.crop(
+                    (0, 0, CONSTANTS.SCREEN_HEIGHT_WIDTH, CONSTANTS.SCREEN_HEIGHT_WIDTH)
+                )
+
+                if new_img.size[0] < 240 or new_img.size[1] < 240:
+                    black_overlay = Image.new(
+                        "RGBA",
+                        CONSTANTS.SCREEN_HEIGHT_WIDTH,
+                        CONSTANTS.SCREEN_HEIGHT_WIDTH,
+                    )
+                    black_overlay.paste(new_img)
+                    new_img = black_overlay
+
+                black_overlay = Image.new("RGBA", new_img.size)
+                advance_sucessful = True
+            except Image.UnidentifiedImageError as e:
+                pass
+
+        # fade out old photo
+        for i in range(self.fade_frames, -1, -1):
+            sendable_img = Image.blend(
+                black_overlay, old_img, i * self.brightness / self.fade_frames
+            )
+            self._send(sendable_img)
+
+        time.sleep(self._BASE_DWELL_DARK)
+
+        # fade in new photo
+        for i in range(self.fade_frames + 1):
+            sendable_img = Image.blend(
+                black_overlay, new_img, i * self.brightness / self.fade_frames
+            )
+            self._send(sendable_img)
+
+        self._curr_img_handle = new_img
+        self._curr_img = new_path
+        self._img_start = time.monotonic()
+        return True
+
+    def _advance_no_fade(self):
+
+        old_img = self._curr_img_handle
+
+        advance_sucessful = False
+
+        while not advance_sucessful:
+            new_path = self._get_next_img()
+            if new_path == "":
+                return False
+
+            try:
+                new_img = Image.open(new_path)
+
+                new_img = new_img.crop(
+                    (0, 0, CONSTANTS.SCREEN_HEIGHT_WIDTH, CONSTANTS.SCREEN_HEIGHT_WIDTH)
+                )
+
+                if new_img.size[0] < 240 or new_img.size[1] < 240:
+                    black_overlay = Image.new(
+                        "RGBA",
+                        CONSTANTS.SCREEN_HEIGHT_WIDTH,
+                        CONSTANTS.SCREEN_HEIGHT_WIDTH,
+                    )
+                    black_overlay.paste(new_img)
+                    new_img = black_overlay
+
+                self._curr_img = new_path
+
+                new_img = new_img.convert("RGBA")
+                new_img.putalpha(255)
+                advance_sucessful = True
+            except Image.UnidentifiedImageError as e:
+                pass
+
+        if self.brightness < 1.0:
+            black_overlay = Image.new("RGBA", new_img.size)
+            new_img = Image.blend(black_overlay, new_img, self.brightness)
+
+        # gradually scroll new img over old img
+        for i in range(self._NO_FADE_TRANSITION_INCREMENTS + 1):
+            curr_y = (
+                i * CONSTANTS.SCREEN_HEIGHT_WIDTH / self._NO_FADE_TRANSITION_INCREMENTS
+            )
+            img_piece = new_img.crop((0, 0, CONSTANTS.SCREEN_HEIGHT_WIDTH, curr_y))
+            old_img.paste(img_piece)
+            self._send(old_img)
+
+        self._curr_img_handle = new_img
+        self._curr_img = new_path
+        self._img_start = time.monotonic()
+        return True
+
+    def _send(self, img):
+        # sends current bmp_img to the frontend
+        buffered = BytesIO()
+        img.save(buffered, format=CONSTANTS.BMP_IMG)
+        byte_base64 = base64.b64encode(buffered.getvalue())
+
+        # only send the base_64 string contents
+        img_str = str(byte_base64)[2:-1]
+
+        sendable_json = {CONSTANTS.BASE_64: img_str}
+        utils.send_to_simulator(sendable_json, CONSTANTS.CLUE)