add micropython drawing primitives demo to breakout_roundlcd

micropython/examples/breakout_roundlcd/drawing_primitives_demo.py

@@ -0,0 +1,101 @@
+from breakout_roundlcd import BreakoutRoundLCD
+
+
+width = BreakoutRoundLCD.WIDTH
+height = BreakoutRoundLCD.HEIGHT
+
+display_buffer = bytearray(width * height * 2)  # 2-bytes per pixel (RGB565)
+display = BreakoutRoundLCD(display_buffer)
+
+display.set_backlight(1)
+
+while True:
+    display.set_pen(0, 0, 0)
+    display.clear()
+
+    # circle
+    display.set_pen(255, 0, 0)
+    display.circle(
+        width // 5,  # center point x
+        height // 3,  # center point y
+        16,  # radius
+    )
+
+    # rectangle
+    display.set_pen(255, 255, 0)
+    display.rectangle(
+        int((width * 2 / 5) - 16),  # starting point x
+        int(height // 3) - 8,  # starting point y
+        32,  # width
+        16,  # height
+    )
+
+    # triangle
+    display.set_pen(0, 255, 0)
+    display.triangle(
+        int(width * 3 / 5), int(height // 3) - 16,  # point 1 x, y
+        int(width * 3 / 5) - 16, int(height // 3) + 16,  # point 2 x, y
+        int(width * 3 / 5) + 16, int(height // 3) + 16,  # point 3 x, y
+    )
+
+    # character
+    display.set_pen(0, 255, 255)
+    display.character(
+        64,  # int character code
+        int(width * 4 / 5 - 16),  # box starting point x
+        int(height // 3) - 16,  # box starting point y
+        4,  # scale - not required, default is 2
+    )
+
+    # pixel span
+    display.set_pen(255, 255, 255)
+    display.pixel_span(
+        int(width * 1 / 5),  # starting point x
+        int(height * 2.5 / 5),  # starting point y
+        130,  # length
+    )
+
+    # text
+    display.set_pen(0, 0, 255)
+    display.text(
+        'test text',  # text
+        int(width // 5),  # box starting point x
+        int(height * 3 / 5),  # box starting point y
+        True,  # word wrap
+        6,  # scale - not required, default is 2
+    )
+
+    # lines
+    display.set_pen(255, 0, 255)
+    display.line(
+        0,  # staring point x
+        int(height / 2),  # staring point y
+        width,  # end point x
+        height,  # end point y
+    )
+    display.line(
+        width,  # staring point x
+        int(height / 2),  # staring point y
+        0,  # end point x
+        height,  # end point y
+    )
+
+    # set clip
+    display.set_clip(
+        int(width * 2 / 5),
+        int(height * 2 / 5),
+        int(width * 1 / 5),
+        int(height * 1 / 5)
+    )
+
+    # draw a clipped circle
+    display.circle(
+        int(width * 2 / 5),
+        int(height * 2 / 5),
+        32,
+    )
+
+    # remove clip
+    display.remove_clip()
+
+    display.update()