Merge pull request #5 from FoamyGuy/bitmaptools_rotate

Bitmaptools rotate examples

Author: tannewt

bitmaptools/Billie.bmp

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+# SPDX-FileCopyrightText: Copyright (c) 2018 Adafruit Industries
+#
+# SPDX-License-Identifier: MIT

bitmaptools/Billie.bmp.license

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+# SPDX-FileCopyrightText: Copyright (c) 2022 Tim Cocks
+#
+# SPDX-License-Identifier: MIT
+"""
+Use bitmaptools.rotozoom() to rotate a bmp image.
+"""
+import math
+import bitmaptools
+import board
+import displayio
+import adafruit_imageload
+
+# use the builtin display
+display = board.DISPLAY
+
+# load bmp image into a Bitmap and Palette objects
+source_bitmap, source_palette = adafruit_imageload.load("Billie.bmp",
+                                                        bitmap=displayio.Bitmap,
+                                                        palette=displayio.Palette)
+# Create a TileGrid to show the bitmap
+source_tile_grid = displayio.TileGrid(source_bitmap, pixel_shader=source_palette)
+
+# Create destination Bitmap object to hold the rotated image
+dest_bitmap = displayio.Bitmap(source_bitmap.height, source_bitmap.height, len(source_palette))
+
+# Create a TileGrid to show the destination Bitmap with the rotated image in it
+dest_tile_grid = displayio.TileGrid(dest_bitmap, pixel_shader=source_palette)
+
+# take from source bitmap, put into destination bitmap.
+# default values for x,y locations and clipping so whole image is used
+# angle argument accepts radians. You can use math module to convert from degrees
+bitmaptools.rotozoom(dest_bitmap, source_bitmap, angle=math.radians(270))
+
+# move the rotated image tilegrid over to the right some
+dest_tile_grid.x = 100
+
+# Create a Group to show the TileGrids
+group = displayio.Group()
+
+# Add the TileGrids to the Group
+group.append(source_tile_grid)
+group.append(dest_tile_grid)
+
+# Add the Group to the Display
+display.show(group)
+
+# Loop forever so you can enjoy your image
+while True:
+    pass

bitmaptools/bitmaptools_rotate_bmp.py

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+# SPDX-FileCopyrightText: Copyright (c) 2022 Tim Cocks
+#
+# SPDX-License-Identifier: MIT
+"""
+Use bitmaptools.rotozoom() to rotate a bmp image in a circle animated.
+"""
+import math
+import bitmaptools
+import board
+import displayio
+import adafruit_imageload
+
+# use the builtin display
+display = board.DISPLAY
+
+# load bmp image into a Bitmap and Palette objects
+source_bitmap, source_palette = adafruit_imageload.load("Billie.bmp",
+                                                        bitmap=displayio.Bitmap,
+                                                        palette=displayio.Palette)
+# Create a TileGrid to show the bitmap
+source_tile_grid = displayio.TileGrid(source_bitmap, pixel_shader=source_palette)
+
+# Create destination Bitmap object to hold the rotated image
+dest_bitmap = displayio.Bitmap(source_bitmap.height, source_bitmap.height, len(source_palette))
+
+# Create a TileGrid to show the destination Bitmap with the rotated image in it
+dest_tile_grid = displayio.TileGrid(dest_bitmap, pixel_shader=source_palette)
+
+# move the rotated image tilegrid over to the right some
+dest_tile_grid.x = 100
+
+# Create a Group to show the TileGrids
+group = displayio.Group()
+
+# Add the TileGrids to the Group
+group.append(source_tile_grid)
+group.append(dest_tile_grid)
+
+# Add the Group to the Display
+display.show(group)
+
+# Loop forever so you can enjoy your image
+while True:
+    # loop over all the degrees from 0-360
+    for angle_deg in range(360):
+        # erase previous frame
+        dest_bitmap.fill(0)
+
+        # take from source bitmap, put into destination bitmap.
+        # default values for x,y locations and clipping so whole image is used
+        # angle argument accepts radians. You can use math module to convert from degrees
+        bitmaptools.rotozoom(dest_bitmap, source_bitmap, angle=math.radians(angle_deg))