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Diffstat (limited to '')
| -rw-r--r-- | librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.h | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.h b/librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.h index aa6f4ce..ef53fea 100644 --- a/librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.h +++ b/librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.h @@ -128,19 +128,29 @@ void rtgrpblib_draw_cubic_bezier(RTGRPBLIB_RASTER *restrict raster, double x4, double y4); /** - * Draw a elliptical arc + * Draw a circular arc * * @param raster The drawing buffer - * @param x0, y0 The midpoint of the ellipse - * @param semiwidth Half the width of the ellipse - * @param semiheight Half the height of the ellipse + * @param x0, y0 The midpoint of the circle + * @param semiwidth Half the width of the circle + * @param semiheight Half the height of the circle * @param start The angular starting point of the arc, in radians * @param end The angular end point of the arc, in radians + * + * Rather than specify a radius, a semimajor and semiminor is + * specified, despite this, the shape is called a circular rather + * than elliptical, this is because the function is indented to + * draw a circular arc on a image with different horizontal + * and vertical cell densities; note an elliptical arc on an image + * with the same horizontal as vertical cell density. This is + * why the function doesn't provide a way to rotate the ellipse: + * it's a circle, not an ellipse, and circles are perfectly + * symmetrical */ -void rtgrpblib_draw_elliptical_arc(RTGRPBLIB_RASTER *restrict raster, - double x0, double y0, - double semiwidth, double semiheight, - double start, double end); +void rtgrpblib_draw_circular_arc(RTGRPBLIB_RASTER *restrict raster, + double x0, double y0, + double semiwidth, double semiheight, + double start, double end); #if defined(__clang__) |