diff options
| -rw-r--r-- | rtgrpblib_draw_circular_arc.3 | 68 | ||||
| -rw-r--r-- | rtgrpblib_draw_cubic_bezier.3 | 55 | ||||
| -rw-r--r-- | rtgrpblib_draw_linear_bezier.3 | 2 | ||||
| -rw-r--r-- | rtgrpblib_draw_quadratic_bezier.3 | 57 |
4 files changed, 181 insertions, 1 deletions
diff --git a/rtgrpblib_draw_circular_arc.3 b/rtgrpblib_draw_circular_arc.3 new file mode 100644 index 0000000..49b0c70 --- /dev/null +++ b/rtgrpblib_draw_circular_arc.3 @@ -0,0 +1,68 @@ +.TH RTGRPBLIB_DRAW_CIRCULAR_ARC 3 LIBRIFUNKTIONSTECKENSNITTSGLYFRASTERISERINGSPROGRAMBIBLIOTEKET +.SH NAME +rtgrpblib_draw_circular_arc - Draw a circular arc + +.SH DESCRIPTION +.LP +.nf +#include <librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.h> + +void rtgrpblib_draw_circular_arc(RTGRPBLIB_RASTER *\fIraster\fP, + double \fIx0\fP, double \fIy0\fP, + double \fIsemiwidth\fP, double \fIsemiheight\fP, + double \fIstart\fP, double \fIend\fP); +.fi +.PP +Link with +.IR "-lrifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket -lm" . + +.SH DESCRIPTION +The +.BR rtgrpblib_draw_circular_arc () +function draws onto +.I raster +a circular arch, as part of a contour. The arc's circle +is defined as the circle with the midpoint +.RI ( x0 , +.IR y0 ) +and the radius that is +.I semiwidth +cells horizontally and +.I semiheight +cells vertically. The arc itself is drawn from the angle +.I start +to the +.IR end , +both are specified in radians. + +.SH RETURN VALUES +None. + +.SH ERRORS +None. + +.SH NOTES +The +.BR rtgrpblib_draw_circular_arc () +function is intended to draw the arc of a circle, not the +arc of an ellipse, which is why it doesn't have a way to +rotate the ellipse despite the function providing a way +to specify the semimajor and the semiminor, not just a +radius. The function provides this two parameters, rather +than a single radius parameter because the image may, and +indeed probably will, have a different horizontal cell +density than vertical cell density, this is because the +pixels on a monitor are not perfect squares (and might +not even approximate square), and because the image may +be created (for example) for a horizontal cell density +three times greater than the monitor's horizontal pixel +density, but the same vertical density, in order to +render an image that will use subpixel antialiasing. + +.SH SEE ALSO +.BR librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket (7), +.BR rtgrpblib_create_raster (3), +.BR rtgrpblib_fill_shapes (3), +.BR rtgrpblib_draw_linear_bezier (3), +.BR rtgrpblib_draw_quadratic_bezier (3), +.BR rtgrpblib_draw_cubic_bezier (3) diff --git a/rtgrpblib_draw_cubic_bezier.3 b/rtgrpblib_draw_cubic_bezier.3 new file mode 100644 index 0000000..eef0ab4 --- /dev/null +++ b/rtgrpblib_draw_cubic_bezier.3 @@ -0,0 +1,55 @@ +.TH RTGRPBLIB_DRAW_CUBIC_BEZIER 3 LIBRIFUNKTIONSTECKENSNITTSGLYFRASTERISERINGSPROGRAMBIBLIOTEKET +.SH NAME +rtgrpblib_draw_cubic_bezier - Draw a cubic Bézier curve + +.SH DESCRIPTION +.LP +.nf +#include <librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.h> + +void rtgrpblib_draw_cubic_bezier(RTGRPBLIB_RASTER *\fIraster\fP, + double \fIx1\fP, double \fIy1\fP, + double \fIx2\fP, double \fIy2\fP, + double \fIx3\fP, double \fIy3\fP, + double \fIx4\fP, double \fIy4\fP); +.fi +.PP +Link with +.IR "-lrifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket -lm" . + +.SH DESCRIPTION +The +.BR rtgrpblib_draw_cubic_bezier () +function draws onto +.I raster +a cubic Bézier curve, as part of a contour, from +.RI ( x1 , +.IR y1 ) +to +.RI ( x4 , +.IR y4 ) +with +.RI ( x2 , +.IR y2 ) +and +.RI ( x4 , +.IR y4 ) +as the additional control points. +.PP +The function draws the linear interpolant of corresponding points in +the two quadratic Bézier curves made of the of the three first +control points and the three last control points respectively. + +.SH RETURN VALUES +None. + +.SH ERRORS +None. + +.SH SEE ALSO +.BR librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket (7), +.BR rtgrpblib_create_raster (3), +.BR rtgrpblib_fill_shapes (3), +.BR rtgrpblib_draw_linear_bezier (3), +.BR rtgrpblib_draw_quadratic_bezier (3), +.BR rtgrpblib_draw_circular_arc (3) diff --git a/rtgrpblib_draw_linear_bezier.3 b/rtgrpblib_draw_linear_bezier.3 index 05b12f9..f525db7 100644 --- a/rtgrpblib_draw_linear_bezier.3 +++ b/rtgrpblib_draw_linear_bezier.3 @@ -20,7 +20,7 @@ The .BR rtgrpblib_draw_linear_bezier () function draws onto .I raster -a line segment, as part a contour, from +a line segment, as part of a contour, from .RI ( x1 , .IR y1 ) to diff --git a/rtgrpblib_draw_quadratic_bezier.3 b/rtgrpblib_draw_quadratic_bezier.3 new file mode 100644 index 0000000..f8e5467 --- /dev/null +++ b/rtgrpblib_draw_quadratic_bezier.3 @@ -0,0 +1,57 @@ +.TH RTGRPBLIB_DRAW_QUADRATIC_BEZIER 3 LIBRIFUNKTIONSTECKENSNITTSGLYFRASTERISERINGSPROGRAMBIBLIOTEKET +.SH NAME +rtgrpblib_draw_quadratic_bezier - Draw a quadratic Bézier curve + +.SH DESCRIPTION +.LP +.nf +#include <librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.h> + +void rtgrpblib_draw_quadratic_bezier(RTGRPBLIB_RASTER *\fIraster\fP, + double \fIx1\fP, double \fIy1\fP, + double \fIx2\fP, double \fIy2\fP, + double \fIx3\fP, double \fIy3\fP); +.fi +.PP +Link with +.IR "-lrifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket -lm" . + +.SH DESCRIPTION +The +.BR rtgrpblib_draw_quadratic_bezier () +function draws onto +.I raster +a quadratic Bézier curve, as part of a contour, from +.RI ( x1 , +.IR y1 ) +to +.RI ( x3 , +.IR y3 ) +with +.RI ( x2 , +.IR y2 ) +as the additional control point. +.PP +The function draws the linear interpolant of corresponding points in +the line segments +.RI ( x1 , +.IR y1 )-( x2 , +.IR y2 ) +and +.RI ( x2 , +.IR y2 )-( x3 , +.IR y3 ). + +.SH RETURN VALUES +None. + +.SH ERRORS +None. + +.SH SEE ALSO +.BR librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket (7), +.BR rtgrpblib_create_raster (3), +.BR rtgrpblib_fill_shapes (3), +.BR rtgrpblib_draw_linear_bezier (3), +.BR rtgrpblib_draw_cubic_bezier (3), +.BR rtgrpblib_draw_circular_arc (3) |