jpg_decode and crop example

examples/T-DISPLAY/toasters_jpg/toasters_jpg.py

+'''
+toasters_jpg.py
+
+    An example using a jpg sprite map to draw sprites on LILYGO® TTGO T-Display
+
+    youtube video: https://youtu.be/0uWsjKQmCpU
+
+    spritesheet from CircuitPython_Flying_Toasters
+    https://learn.adafruit.com/circuitpython-sprite-animation-pendant-mario-clouds-flying-toasters
+'''
+
+import time
+import random
+from machine import Pin, SPI
+import st7789
+
+
+class toast():
+    '''
+    toast class to keep track of a sprites locaton and step
+    '''
+
+    def __init__(self, sprites, x, y):
+        self.sprites = sprites
+        self.steps = len(sprites)
+        self.x = x
+        self.y = y
+        self.step = random.randint(0, self.steps-1)
+        self.speed = random.randint(2, 5)
+
+    def move(self):
+        if self.x <= 0:
+            self.speed = random.randint(2, 5)
+            self.x = 135-64
+
+        self.step += 1
+        self.step %= self.steps
+        self.x -= self.speed
+
+
+def main():
+    '''
+    Draw and move sprite
+    '''
+    try:
+
+        spi = SPI(1, baudrate=30000000, sck=Pin(18), mosi=Pin(19))
+
+        # initialize display
+        tft = st7789.ST7789(
+            spi,
+            135,
+            240,
+            reset=Pin(23, Pin.OUT),
+            cs=Pin(5, Pin.OUT),
+            dc=Pin(16, Pin.OUT),
+            backlight=Pin(4, Pin.OUT),
+            rotation=0)
+
+        # enable display and clear screen
+        tft.init()
+        tft.fill(st7789.BLACK)
+
+        width = 64
+        height = 64
+
+        # grab each sprite from the toaster.jpg sprite sheet
+        t1, _, _ = tft.jpg_decode('toaster.jpg', 0, 0, width, height)
+        t2, _, _ = tft.jpg_decode('toaster.jpg', width, 0, width, height)
+        t3, _, _ = tft.jpg_decode('toaster.jpg', width*2, 0, width, height)
+        t4, _, _ = tft.jpg_decode('toaster.jpg', 0, height, width, height)
+        t5, _, _ = tft.jpg_decode('toaster.jpg', width, height, width, height)
+
+        TOASTERS = [t1, t2, t3, t4]
+        TOAST = [t5]
+
+        sprites = [
+            toast(TOASTERS, tft.width() - width, 0),
+            toast(TOAST, tft.width() - width * 2, tft.height() // 3),
+            toast(TOASTERS, tft.width() - width * 4, tft.height() // 3 * 2)
+        ]
+
+        # move and draw sprites
+        while True:
+            for man in sprites:
+                bitmap = man.sprites[man.step]
+                tft.fill_rect(
+                    man.x+width-man.speed,
+                    man.y,
+                    man.speed,
+                    height,
+                    st7789.BLACK)
+
+                man.move()
+
+                if man.x > 0:
+                    tft.blit_buffer(bitmap, man.x, man.y, width, height)
+                else:
+                    tft.fill_rect(
+                        0,
+                        man.y,
+                        width,
+                        height,
+                        st7789.BLACK)
+
+            time.sleep(0.05)
+
+    finally:
+        # shutdown spi
+        spi.deinit()
+
+
+main()