Add vectorio support

[hackapet/Adafruit_Blinka_Displayio.git] / vectorio / _circle.py

diff --git a/vectorio/_circle.py b/vectorio/_circle.py
new file mode 100644 (file)
index 0000000..cc87351
--- /dev/null
+++ b/vectorio/_circle.py
@@ -0,0 +1,91 @@
+# SPDX-FileCopyrightText: 2020 Melissa LeBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+"""
+`vectorio.circle`
+================================================================================
+
+vectorio Circle for Blinka
+
+**Software and Dependencies:**
+
+* Adafruit Blinka:
+  https://github.com/adafruit/Adafruit_Blinka/releases
+
+* Author(s): Melissa LeBlanc-Williams
+
+"""
+
+from typing import Union
+from displayio._colorconverter import ColorConverter
+from displayio._palette import Palette
+from displayio._area import Area
+from ._vectorshape import _VectorShape
+
+__version__ = "0.0.0+auto.0"
+__repo__ = "https://github.com/adafruit/Adafruit_Blinka_displayio.git"
+
+
+class Circle(_VectorShape):
+    """Vectorio Circle"""
+
+    def __init__(
+        self,
+        *,
+        pixel_shader: Union[ColorConverter, Palette],
+        radius: int,
+        x: int,
+        y: int,
+    ):
+        """Circle is positioned on screen by its center point.
+
+        :param Union[~displayio.ColorConverter,~displayio.Palette] pixel_shader:
+            The pixel shader that produces colors from values
+        :param int radius: The radius of the circle in pixels
+        :param int x: Initial x position of the axis.
+        :param int y: Initial y position of the axis.
+        :param int color_index: Initial color_index to use when selecting color from the palette.
+        """
+        self._radius = 1
+        self._color_index = 1
+        super().__init__(pixel_shader, x, y)
+        self.radius = radius
+
+    @property
+    def radius(self) -> int:
+        """The radius of the circle in pixels"""
+        return self._radius
+
+    @radius.setter
+    def radius(self, value: int) -> None:
+        if value < 1:
+            raise ValueError("radius must be >= 1")
+        self._radius = abs(value)
+        self._shape_set_dirty()
+
+    @property
+    def color_index(self) -> int:
+        """The color_index of the circle as 0 based index of the palette."""
+        return self._color_index - 1
+
+    @color_index.setter
+    def color_index(self, value: int) -> None:
+        self._color_index = abs(value + 1)
+        self._shape_set_dirty()
+
+    def _get_pixel(self, x: int, y: int) -> int:
+        x = abs(x)
+        y = abs(y)
+        if x + y <= self._radius:
+            return self._color_index
+        if x > self._radius or y > self._radius:
+            return 0
+        pythagoras_smaller_than_radius = x * x + y * y <= self._radius * self._radius
+        return self._color_index if pythagoras_smaller_than_radius else 0
+
+    def _get_area(self, out_area: Area) -> None:
+        out_area.x1 = -1 * self._radius - 1
+        out_area.y1 = -1 * self._radius - 1
+        out_area.x2 = self._radius + 1
+        out_area.y2 = self._radius + 1