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#define INKSCAPE_LPE_SPIRO_C
/*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "live_effects/lpe-spiro.h"
#include "display/curve.h"
#include <libnr/n-art-bpath.h>
#include "nodepath.h"
#include "live_effects/bezctx.h"
#include "live_effects/bezctx_intf.h"
#include "live_effects/spiro.h"
typedef struct {
bezctx base;
SPCurve *curve;
int is_open;
} bezctx_ink;
void bezctx_ink_moveto(bezctx *bc, double x, double y, int is_open)
{
bezctx_ink *bi = (bezctx_ink *) bc;
sp_curve_moveto(bi->curve, x, y);
}
void bezctx_ink_lineto(bezctx *bc, double x, double y)
{
bezctx_ink *bi = (bezctx_ink *) bc;
sp_curve_lineto(bi->curve, x, y);
}
void bezctx_ink_quadto(bezctx *bc, double xm, double ym, double x3, double y3)
{
bezctx_ink *bi = (bezctx_ink *) bc;
double x0, y0;
double x1, y1;
double x2, y2;
NR::Point last = sp_curve_last_point(bi->curve);
x0 = last[NR::X];
y0 = last[NR::Y];
x1 = xm + (1./3) * (x0 - xm);
y1 = ym + (1./3) * (y0 - ym);
x2 = xm + (1./3) * (x3 - xm);
y2 = ym + (1./3) * (y3 - ym);
sp_curve_curveto(bi->curve, x1, y1, x2, y2, x3, y3);
}
void bezctx_ink_curveto(bezctx *bc, double x1, double y1, double x2, double y2,
double x3, double y3)
{
bezctx_ink *bi = (bezctx_ink *) bc;
sp_curve_curveto(bi->curve, x1, y1, x2, y2, x3, y3);
}
bezctx *
new_bezctx_ink(SPCurve *curve) {
bezctx_ink *result = g_new(bezctx_ink, 1);
result->base.moveto = bezctx_ink_moveto;
result->base.lineto = bezctx_ink_lineto;
result->base.quadto = bezctx_ink_quadto;
result->base.curveto = bezctx_ink_curveto;
result->base.mark_knot = NULL;
result->curve = curve;
return &result->base;
}
namespace Inkscape {
namespace LivePathEffect {
LPESpiro::LPESpiro(LivePathEffectObject *lpeobject) :
Effect(lpeobject)
{
}
LPESpiro::~LPESpiro()
{
}
void
LPESpiro::setup_nodepath(Inkscape::NodePath::Path *np)
{
sp_nodepath_show_handles(np, false);
sp_nodepath_show_helperpath(np, false);
}
void
LPESpiro::doEffect(SPCurve * curve)
{
SPCurve *csrc = sp_curve_copy(curve);
sp_curve_reset(curve);
bezctx *bc = new_bezctx_ink(curve);
int len = SP_CURVE_LENGTH(csrc);
spiro_cp *path = g_new (spiro_cp, len + 1);
NArtBpath *bpath = csrc->_bpath;
int ib = 0;
int ip = 0;
bool closed = false;
NR::Point pt(0, 0);
NArtBpath *first_in_subpath = NULL;
while(ib <= len) {
path [ip].x = bpath[ib].x3;
path [ip].y = bpath[ib].y3;
// std::cout << "==" << bpath[ib].code << " ip" << ip << " ib" << ib << "\n";
if (bpath[ib].code == NR_END || bpath[ib].code == NR_MOVETO_OPEN || bpath[ib].code == NR_MOVETO) {
if (ip != 0) { // run prev subpath
int sp_len = 0;
if (!closed) {
path[ip - 1].ty = '}';
sp_len = ip;
} else {
sp_len = ip - 1;
}
spiro_seg *s = NULL;
//for (int j = 0; j <= sp_len; j ++) printf ("%c\n", path[j].ty);
s = run_spiro(path, sp_len);
spiro_to_bpath(s, sp_len, bc);
free(s);
path[0].x = path[ip].x;
path[0].y = path[ip].y;
ip = 0;
}
if (bpath[ib].code == NR_MOVETO_OPEN) {
closed = false;
path[ip].ty = '{';
} else {
closed = true;
if (ib < len)
first_in_subpath = &(bpath[ib + 1]);
path[ip].ty = 'c';
}
} else {
// this point is not last, so makes sense to find a proper type for it
NArtBpath *next = NULL;
if (ib < len && (bpath[ib+1].code == NR_END || bpath[ib+1].code == NR_MOVETO_OPEN || bpath[ib+1].code == NR_MOVETO)) { // end of subpath
if (closed)
next = first_in_subpath;
} else {
if (ib < len)
next = &(bpath[ib+1]);
else if (closed)
next = first_in_subpath;
}
if (next) {
bool this_is_line = bpath[ib].code == NR_LINETO ||
(NR::L2(NR::Point(bpath[ib].x3, bpath[ib].y3) - NR::Point(bpath[ib].x2, bpath[ib].y2)) < 0.001);
bool next_is_line = next->code == NR_LINETO ||
(NR::L2(NR::Point(bpath[ib].x3, bpath[ib].y3) - NR::Point(next->x1, next->y1)) < 0.001);
double this_angle = NR_HUGE;
if (this_is_line) {
this_angle = atan2 (bpath[ib].x3 - pt[NR::X], bpath[ib].y3 - pt[NR::Y]);
} else if (bpath[ib].code == NR_CURVETO) {
this_angle = atan2 (bpath[ib].x3 - bpath[ib].x2, bpath[ib].y3 - bpath[ib].y2);
}
double next_angle = NR_HUGE;
if (next_is_line) {
next_angle = atan2 (next->x3 - bpath[ib].x3, next->y3 - bpath[ib].y3);
} else if (next->code == NR_CURVETO) {
next_angle = atan2 (next->x1 - bpath[ib].x3, next->y1 - bpath[ib].y3);
}
if (this_angle != NR_HUGE && next_angle != NR_HUGE && fabs(this_angle - next_angle) < 0.001) {
if (this_is_line && !next_is_line) {
path[ip].ty = ']';
} else if (next_is_line && !this_is_line) {
path[ip].ty = '[';
} else {
path[ip].ty = 'c';
}
} else {
path[ip].ty = 'v';
}
if (closed && next == first_in_subpath) {
path[0].ty = path[ip].ty;
}
}
}
pt = NR::Point(bpath[ib].x3, bpath[ib].y3);
ip++;
ib++;
}
g_free (path);
}
}; //namespace LivePathEffect
}; /* namespace Inkscape */
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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