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/* This file contains the box method, which is a standard part of libplot.
It draws an object: a box, or upright rectangle with diagonal corners
x0,y0 and x1,y1. Boxes are one of the three types of primitive closed
path that libplot supports, along with circles and ellipses. */
/* Most Plotters obviously require that the map from the user frame to the
device frame preserve coordinate axes, in order to draw a box as a
primitive (if it isn't, what results will be rotated or skewed). The
constraints on the user frame -> device frame map (e.g., it must
preserve axes) are specified by the internal `allowed_box_scaling'
parameter, which this code checks. */
#include "sys-defines.h"
#include "extern.h"
int
#ifdef _HAVE_PROTOS
_API_fbox (R___(Plotter *_plotter) double x0, double y0, double x1, double y1)
#else
_API_fbox (R___(_plotter) x0, y0, x1, y1)
S___(Plotter *_plotter;)
double x0, y0, x1, y1;
#endif
{
double xnew, ynew;
plPoint p0, p1;
bool clockwise;
if (!_plotter->data->open)
{
_plotter->error (R___(_plotter)
"fbox: invalid operation");
return -1;
}
/* If a simple path is under construction (so that endsubpath() must not
have been invoked), flush out the whole compound path. (It may
include other, previously drawn simple paths.) */
if (_plotter->drawstate->path)
_API_endpath (S___(_plotter));
/* begin a new path */
_plotter->drawstate->path = _new_plPath ();
p0.x = x0;
p0.y = y0;
p1.x = x1;
p1.y = y1;
clockwise = _plotter->drawstate->orientation < 0 ? true : false;
if (!_plotter->drawstate->points_are_connected)
/* line type is `disconnected': just plot a pseudo-box consisting of
four line segments, which will ultimately be displayed (see
g_endpath.c) as four filled circles (one at each vertex) */
_add_box_as_lines (_plotter->drawstate->path,
p0, p1, clockwise);
else
/* general case */
{
/* Add box to path buffer, as a primitive only if (1) this Plotter
supports box primitives, and (2) it isn't to be edged, or if it's
to be edged solid (not dashed). The latter restriction is to
prevent confusion over the starting point, along the edge of box,
for the dashing pattern. */
if ((_plotter->drawstate->pen_type == 0 /* not edged */
||
(_plotter->drawstate->dash_array_in_effect == false
&& _plotter->drawstate->line_type == L_SOLID)) /* solid edge */
&&
((_plotter->data->allowed_box_scaling == AS_ANY)
||
(_plotter->data->allowed_box_scaling == AS_AXES_PRESERVED
&& _plotter->drawstate->transform.axes_preserved)))
/* add box as a primitive */
_add_box (_plotter->drawstate->path,
p0, p1, clockwise);
else
/* add box as a polyline */
_add_box_as_lines (_plotter->drawstate->path,
p0, p1, clockwise);
if (_plotter->drawstate->path->type == PATH_SEGMENT_LIST)
/* pass all the newly added segments to the Plotter-specific
function maybe_paint_segments(), since some Plotters plot paths
in real time, i.e., prepaint them, rather than waiting until
endpath() is called */
_plotter->maybe_prepaint_segments (R___(_plotter) 0);
}
/* move to center (libplot convention) */
xnew = 0.5 * (x0 + x1);
ynew = 0.5 * (y0 + y1);
_plotter->drawstate->pos.x = xnew;
_plotter->drawstate->pos.y = ynew;
return 0;
}
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