diff options
Diffstat (limited to 'desktop/plotters.h')
| -rw-r--r-- | desktop/plotters.h | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/desktop/plotters.h b/desktop/plotters.h index 4eb894981..6d2b66783 100644 --- a/desktop/plotters.h +++ b/desktop/plotters.h @@ -41,13 +41,17 @@ struct bitmap; * disc - Plots a circle, centered on (x,y), which is optionally filled. * line - Plots a line from (x0,y0) to (x1,y1). Coordinates are at * centre of line width/thickness. - * path - + * path - Plots a path consisting of cubic Bezier curves. Line colour is + * given by c and fill colour is given by fill. * polygon - Plots a filled polygon with straight lines between points. * The lines around the edge of the ploygon are not plotted. The * polygon is filled with the non-zero winding rule. * rectangle - Plots a rectangle outline. The line can be solid, dotted or - * dashed. - * fill - Plots a filled rectangle. + * dashed. Top left corner at (x0,y0) and rectangle has given + * width and height. + * fill - Plots a filled rectangle. Top left corner at (x0,y0), bottom + * right corner at (x1,y1). Note: (x0,y0) is inside filled area, + * but (x1,y1) is below and to the right. See diagram below. * clip - Sets a clip rectangle for subsequent plots. * text - Plots text. (x,y) is the coordinate of the left hand side of * the text's baseline. The text is UTF-8 encoded. The colour, c, @@ -76,8 +80,8 @@ struct bitmap; * redraw. It tries to avoid plotting to the same area * more than once. See desktop/knockout.c * - * Coordinates are from top left and (0,0) is the top left grid denomination. - * If a "fill" is drawn from (0,0) to (4,3), the result is: + * Coordinates are from top left of canvas and (0,0) is the top left grid + * denomination. If a "fill" is drawn from (0,0) to (4,3), the result is: * * 0 1 2 3 4 5 * +-+-+-+-+-+- |