add color_index to constructor and make it zero-based

diff --git a/vectorio/_rectangle.py b/vectorio/_rectangle.py
index e4c595272ad921a577e3ee557c3d8d81e162066f..f8c8d820bd25f5d517e5f25e6715c1ee13e5bdfa 100644 (file)
--- a/vectorio/_rectangle.py
+++ b/vectorio/_rectangle.py
@@ -38,6 +38,7 @@ class Rectangle(_VectorShape):
         height: int,
         x: int,
         y: int,
+        color_index: int = 0,
     ):
         """Represents a rectangle by defining its bounds
 
@@ -51,7 +52,7 @@ class Rectangle(_VectorShape):
         """
         self._width = 1
         self._height = 1
-        self._color_index = 1
+        self._color_index = color_index
 
         super().__init__(pixel_shader, x, y)
         self.width = width
@@ -85,11 +86,11 @@ class Rectangle(_VectorShape):
     @property
     def color_index(self) -> int:
         """The color_index of the rectangle as 0 based index of the palette."""
-        return self._color_index - 1
+        return self._color_index
 
     @color_index.setter
     def color_index(self, value: int) -> None:
-        self._color_index = abs(value + 1)
+        self._color_index = abs(value)
         self._shape_set_dirty()
 
     def _get_pixel(self, x: int, y: int) -> int: