Merge pull request #2 from jposada202020/adding_example

adding_example

Author: CedarGroveStudios

examples/colorfader_example.py

@@ -0,0 +1,64 @@
+# SPDX-FileCopyrightText: 2023 Jose D. Montoya
+# SPDX-License-Identifier: MIT
+
+"""
+This is an animation to demonstrate the use of color_fader function.
+This example is heavily based in adafruit_display_shapes/examples/display_shapes_circle_animation.py
+
+"""
+
+import time
+import gc
+import board
+import displayio
+from adafruit_display_shapes.circle import Circle
+from cedargrove_colorfader import color_fader
+
+display = board.DISPLAY
+main_group = displayio.Group()
+color_bitmap = displayio.Bitmap(display.width, display.height, 1)
+color_palette = displayio.Palette(1)
+color_palette[0] = 0xFFFFFF
+bg_sprite = displayio.TileGrid(color_bitmap, pixel_shader=color_palette, x=0, y=0)
+main_group.append(bg_sprite)
+
+posx = 0
+posy = 0
+
+# Define Circle characteristics
+circle_radius = 20
+circle = Circle(posx, posy, circle_radius, fill=0x00FF00, outline=0xFF00FF)
+main_group.append(circle)
+
+# Define Circle Animation Steps
+delta_x = 2
+delta_y = 2
+
+# Showing the items on the screen
+display.show(main_group)
+
+circle.fill = 0xFF0000
+brightness = 0
+
+bright_delta = 1 / display.width
+while True:
+    if circle.y + circle_radius >= display.height - circle_radius:
+        delta_y = -1
+    if circle.x + circle_radius >= display.width - circle_radius:
+        delta_x = -1
+    if circle.x - circle_radius <= 0 - circle_radius:
+        delta_x = 1
+    if circle.y - circle_radius <= 0 - circle_radius:
+        delta_y = 1
+
+    circle.x = circle.x + delta_x
+    circle.y = circle.y + delta_y
+    brightness = brightness + bright_delta * delta_x
+    # pylint: disable=consider-using-max-builtin, consider-using-min-builtin
+    if brightness > 1:
+        brightness = 1
+    if brightness < 0:
+        brightness = 0
+    circle.fill = color_fader(source_color=0x00FF00, brightness=brightness, gamma=1.0)
+    time.sleep(0.02)
+    gc.collect()