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commit 9800d72f27df325aa25aaa5b35851551ef010921 Author: BlueBear jiri.bluebear.dluhos@gmail.com Date: Sun Nov 27 21:30:48 2011 +0100

Slightly refined documentation for circles and ellipses.

diff --git a/doc/drawing_api.txt b/doc/drawing_api.txt index 75a67e4..e73a07c 100644 --- a/doc/drawing_api.txt +++ b/doc/drawing_api.txt @@ -79,7 +79,10 @@ void GP_Circle(GP_Context *context, GP_Coord xcenter, GP_Coord ycenter, GP_Size r, GP_Pixel pixel); --------------------------------------------------------------------------------

-Draws a circle. +Draws a circle centered at (xcenter, ycenter) with radius 'r' (in pixels). + +The circle is drawn so that all affected pixels will fit into a square +specified by points (xcenter-r, ycenter-r, xcenter+r, ycenter+r), inclusive.

[source,c] -------------------------------------------------------------------------------- @@ -89,6 +92,10 @@ void GP_FillCircle(GP_Context *context, GP_Coord xcenter, GP_Coord ycenter,

Draws a filled circle.

+The set of pixels affected by 'GP_FillCircle()' is exactly the same as if +drawing the circle boundary using GP_Circle() and then filling all pixels +within the boundary with the same color. + Rings ~~~~~ [source,c] @@ -97,7 +104,10 @@ void GP_Ring(GP_Context *context, GP_Coord xcenter, GP_Coord ycenter, GP_Size r1, GP_Size r2, GP_Pixel pixel); --------------------------------------------------------------------------------

-Draws a ring. +Draws a ring (two circles centered at (xcenter, ycenter) with radii 'r1' and 'r2'). + +The result is exactly the same as calling 'GP_Circle()' with the same center +and appropriate radii.

[source,c] -------------------------------------------------------------------------------- @@ -119,7 +129,10 @@ void GP_Ellipse(GP_Context *context, GP_Coord xcenter, GP_Coord ycenter, GP_Size a, GP_Size b, GP_Pixel pixel); --------------------------------------------------------------------------------

-Draws an ellipse. +Draws an axis-aligned ellipse. + +The ellipse is drawn so that all affected pixels will fit into a rectangle +specified by points (xcenter-a, ycenter-b, xcenter+a, ycenter+b), inclusive.

[source,c] -------------------------------------------------------------------------------- @@ -127,7 +140,7 @@ void GP_FillEllipse(GP_Context *context, GP_Coord xcenter, GP_Coord ycenter, GP_Size a, GP_Size b, GP_Pixel pixel); --------------------------------------------------------------------------------

-Draws a filled ellipse. +Draws a filled axis-aligned ellipse.

Triangles ~~~~~~~~~

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Summary of changes: doc/drawing_api.txt | 21 +++++++++++++++++---- 1 files changed, 17 insertions(+), 4 deletions(-)

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