static void gp_stroke_to_path(bContext *C, bGPDlayer *gpl, bGPDstroke *gps, Curve *cu, rctf *subrect, Nurb **curnu,
float minmax_weights[2], const float rad_fac, bool stitch, const bool add_start_point,
const bool add_end_point, tGpTimingData *gtd)
{
bGPDspoint *pt;
Nurb *nu = (curnu) ? *curnu : NULL;
BPoint *bp, *prev_bp = NULL;
const bool do_gtd = (gtd->mode != GP_STROKECONVERT_TIMING_NONE);
const int add_start_end_points = (add_start_point ? 1 : 0) + (add_end_point ? 1 : 0);
int i, old_nbp = 0;
/* create new 'nurb' or extend current one within the curve */
if (nu) {
old_nbp = nu->pntsu;
/* If stitch, the first point of this stroke is already present in current nu.
* Else, we have to add two additional points to make the zero-radius link between strokes.
*/
BKE_nurb_points_add(nu, gps->totpoints + (stitch ? -1 : 2) + add_start_end_points);
}
else {
nu = (Nurb *)MEM_callocN(sizeof(Nurb), "gpstroke_to_path(nurb)");
nu->pntsu = gps->totpoints + add_start_end_points;
nu->pntsv = 1;
nu->orderu = 2; /* point-to-point! */
nu->type = CU_NURBS;
nu->flagu = CU_NURB_ENDPOINT;
nu->resolu = cu->resolu;
nu->resolv = cu->resolv;
nu->knotsu = NULL;
nu->bp = (BPoint *)MEM_callocN(sizeof(BPoint) * nu->pntsu, "bpoints");
stitch = false; /* Security! */
}
if (do_gtd) {
gp_timing_data_set_nbr(gtd, nu->pntsu);
}
/* If needed, make the link between both strokes with two zero-radius additional points */
/* About "zero-radius" point interpolations:
* - If we have at least two points in current curve (most common case), we linearly extrapolate
* the last segment to get the first point (p1) position and timing.
* - If we do not have those (quite odd, but may happen), we linearly interpolate the last point
* with the first point of the current stroke.
* The same goes for the second point, first segment of the current stroke is "negatively" extrapolated
* if it exists, else (if the stroke is a single point), linear interpolation with last curve point...
*/
if (curnu && !stitch && old_nbp) {
float p1[3], p2[3], p[3], next_p[3];
float dt1 = 0.0f, dt2 = 0.0f;
BLI_assert(gps->prev != NULL);
prev_bp = NULL;
if ((old_nbp > 1) && (gps->prev->totpoints > 1)) {
/* Only use last curve segment if previous stroke was not a single-point one! */
prev_bp = &nu->bp[old_nbp - 2];
}
bp = &nu->bp[old_nbp - 1];
/* First point */
gp_strokepoint_convertcoords(C, gps, gps->points, p, subrect);
if (prev_bp) {
interp_v3_v3v3(p1, bp->vec, prev_bp->vec, -GAP_DFAC);
if (do_gtd) {
const int idx = gps->prev->totpoints - 1;
dt1 = interpf(gps->prev->points[idx - 1].time, gps->prev->points[idx].time, -GAP_DFAC);
}
}
else {
interp_v3_v3v3(p1, bp->vec, p, GAP_DFAC);
if (do_gtd) {
dt1 = interpf(gps->inittime - gps->prev->inittime, 0.0f, GAP_DFAC);
}
}
bp++;
gp_stroke_to_path_add_point(gtd, bp, p1, (bp - 1)->vec, do_gtd, gps->prev->inittime, dt1,
0.0f, rad_fac, minmax_weights);
/* Second point */
/* Note dt2 is always negative, which marks the gap. */
if (gps->totpoints > 1) {
gp_strokepoint_convertcoords(C, gps, gps->points + 1, next_p, subrect);
interp_v3_v3v3(p2, p, next_p, -GAP_DFAC);
if (do_gtd) {
dt2 = interpf(gps->points[1].time, gps->points[0].time, -GAP_DFAC);
}
}
else {
interp_v3_v3v3(p2, p, bp->vec, GAP_DFAC);
if (do_gtd) {
dt2 = interpf(gps->prev->inittime - gps->inittime, 0.0f, GAP_DFAC);
}
}
bp++;
gp_stroke_to_path_add_point(gtd, bp, p2, p1, do_gtd, gps->inittime, dt2, 0.0f, rad_fac, minmax_weights);
old_nbp += 2;
}
else if (add_start_point) {
float p[3], next_p[3];
float dt = 0.0f;
gp_strokepoint_convertcoords(C, gps, gps->points, p, subrect);
if (gps->totpoints > 1) {
gp_strokepoint_convertcoords(C, gps, gps->points + 1, next_p, subrect);
interp_v3_v3v3(p, p, next_p, -GAP_DFAC);
if (do_gtd) {
dt = interpf(gps->points[1].time, gps->points[0].time, -GAP_DFAC);
}
}
else {
p[0] -= GAP_DFAC; /* Rather arbitrary... */
dt = -GAP_DFAC; /* Rather arbitrary too! */
}
bp = &nu->bp[old_nbp];
/* Note we can't give anything else than 0.0 as time here, since a negative one (which would be expected value)
* would not work (it would be *before* gtd->inittime, which is not supported currently).
*/
gp_stroke_to_path_add_point(gtd, bp, p, p, do_gtd, gps->inittime, dt, 0.0f, rad_fac, minmax_weights);
old_nbp++;
}
if (old_nbp) {
prev_bp = &nu->bp[old_nbp - 1];
}
/* add points */
for (i = (stitch) ? 1 : 0, pt = &gps->points[(stitch) ? 1 : 0], bp = &nu->bp[old_nbp];
i < gps->totpoints;
i++, pt++, bp++)
{
float p[3];
float width = pt->pressure * gpl->thickness * WIDTH_CORR_FAC;
/* get coordinates to add at */
gp_strokepoint_convertcoords(C, gps, pt, p, subrect);
gp_stroke_to_path_add_point(gtd, bp, p, (prev_bp) ? prev_bp->vec : p, do_gtd, gps->inittime, pt->time,
width, rad_fac, minmax_weights);
prev_bp = bp;
}
if (add_end_point) {
float p[3];
float dt = 0.0f;
if (gps->totpoints > 1) {
interp_v3_v3v3(p, prev_bp->vec, (prev_bp - 1)->vec, -GAP_DFAC);
if (do_gtd) {
const int idx = gps->totpoints - 1;
dt = interpf(gps->points[idx - 1].time, gps->points[idx].time, -GAP_DFAC);
}
}
else {
copy_v3_v3(p, prev_bp->vec);
p[0] += GAP_DFAC; /* Rather arbitrary... */
dt = GAP_DFAC; /* Rather arbitrary too! */
}
/* Note bp has already been incremented in main loop above, so it points to the right place. */
gp_stroke_to_path_add_point(gtd, bp, p, prev_bp->vec, do_gtd, gps->inittime, dt, 0.0f, rad_fac, minmax_weights);
}
/* add nurb to curve */
if (!curnu || !*curnu) {
BLI_addtail(&cu->nurb, nu);
}
if (curnu) {
*curnu = nu;
}
BKE_nurb_knot_calc_u(nu);
}
/* convert stroke to 3d path */
static void gp_stroke_to_path(bContext *C, bGPDlayer *gpl, bGPDstroke *gps, Curve *cu, rctf *subrect, Nurb **curnu,
float minmax_weights[2], float rad_fac, int stitch, tGpTimingData *gtd)
{
bGPDspoint *pt;
Nurb *nu = (curnu) ? *curnu : NULL;
BPoint *bp, *prev_bp = NULL;
const int do_gtd = (gtd->mode != GP_STROKECONVERT_TIMING_NONE);
int i, old_nbp = 0;
/* create new 'nurb' or extend current one within the curve */
if (nu) {
old_nbp = nu->pntsu;
/* If stitch, the first point of this stroke is already present in current nu.
* Else, we have to add to additional points to make the zero-radius link between strokes.
*/
BKE_nurb_points_add(nu, gps->totpoints + (stitch ? -1 : 2));
}
else {
nu = (Nurb *)MEM_callocN(sizeof(Nurb), "gpstroke_to_path(nurb)");
nu->pntsu = gps->totpoints;
nu->pntsv = 1;
nu->orderu = 2; /* point-to-point! */
nu->type = CU_NURBS;
nu->flagu = CU_NURB_ENDPOINT;
nu->resolu = cu->resolu;
nu->resolv = cu->resolv;
nu->knotsu = NULL;
nu->bp = (BPoint *)MEM_callocN(sizeof(BPoint) * nu->pntsu, "bpoints");
stitch = FALSE; /* Security! */
}
if (do_gtd) {
_gp_timing_data_set_nbr(gtd, nu->pntsu);
}
/* If needed, make the link between both strokes with two zero-radius additional points */
/* About "zero-radius" point interpolations:
* - If we have at least two points in current curve (most common case), we linearly extrapolate
* the last segment to get the first point (p1) position and timing.
* - If we do not have those (quite odd, but may happen), we linearly interpolate the last point
* with the first point of the current stroke.
* The same goes for the second point, first segment of the current stroke is "negatively" extrapolated
* if it exists, else (if the stroke is a single point), linear interpolation with last curve point...
*/
if (curnu && !stitch && old_nbp) {
float p1[3], p2[3], p[3], next_p[3];
float delta_time;
prev_bp = NULL;
if ((old_nbp > 1) && gps->prev && (gps->prev->totpoints > 1)) {
/* Only use last curve segment if previous stroke was not a single-point one! */
prev_bp = nu->bp + old_nbp - 2;
}
bp = nu->bp + old_nbp - 1;
/* XXX We do this twice... Not sure it's worth to bother about this! */
gp_strokepoint_convertcoords(C, gps, gps->points, p, subrect);
if (prev_bp) {
interp_v3_v3v3(p1, prev_bp->vec, bp->vec, 1.0f + GAP_DFAC);
}
else {
interp_v3_v3v3(p1, bp->vec, p, GAP_DFAC);
}
if (gps->totpoints > 1) {
/* XXX We do this twice... Not sure it's worth to bother about this! */
gp_strokepoint_convertcoords(C, gps, gps->points + 1, next_p, subrect);
interp_v3_v3v3(p2, p, next_p, -GAP_DFAC);
}
else {
interp_v3_v3v3(p2, p, bp->vec, GAP_DFAC);
}
/* First point */
bp++;
copy_v3_v3(bp->vec, p1);
bp->vec[3] = 1.0f;
bp->f1 = SELECT;
minmax_weights[0] = bp->radius = bp->weight = 0.0f;
if (do_gtd) {
if (prev_bp) {
delta_time = gtd->tot_time + (gtd->tot_time - gtd->times[gtd->cur_point - 1]) * GAP_DFAC;
}
else {
delta_time = gtd->tot_time + (((float)(gps->inittime - gtd->inittime)) - gtd->tot_time) * GAP_DFAC;
}
gp_timing_data_add_point(gtd, gtd->inittime, delta_time, len_v3v3((bp - 1)->vec, p1));
}
/* Second point */
bp++;
copy_v3_v3(bp->vec, p2);
bp->vec[3] = 1.0f;
bp->f1 = SELECT;
minmax_weights[0] = bp->radius = bp->weight = 0.0f;
if (do_gtd) {
/* This negative delta_time marks the gap! */
if (gps->totpoints > 1) {
delta_time = ((gps->points + 1)->time - gps->points->time) * -GAP_DFAC;
}
else {
delta_time = -(((float)(gps->inittime - gtd->inittime)) - gtd->tot_time) * GAP_DFAC;
}
gp_timing_data_add_point(gtd, gps->inittime, delta_time, len_v3v3(p1, p2));
}
old_nbp += 2;
}
if (old_nbp && do_gtd) {
prev_bp = nu->bp + old_nbp - 1;
}
/* add points */
for (i = (stitch) ? 1 : 0, pt = gps->points + ((stitch) ? 1 : 0), bp = nu->bp + old_nbp;
i < gps->totpoints;
i++, pt++, bp++)
{
float p3d[3];
float width = pt->pressure * gpl->thickness * WIDTH_CORR_FAC;
/* get coordinates to add at */
gp_strokepoint_convertcoords(C, gps, pt, p3d, subrect);
copy_v3_v3(bp->vec, p3d);
bp->vec[3] = 1.0f;
/* set settings */
bp->f1 = SELECT;
bp->radius = width * rad_fac;
bp->weight = width;
CLAMP(bp->weight, 0.0f, 1.0f);
if (bp->weight < minmax_weights[0]) {
minmax_weights[0] = bp->weight;
}
else if (bp->weight > minmax_weights[1]) {
minmax_weights[1] = bp->weight;
}
/* Update timing data */
if (do_gtd) {
gp_timing_data_add_point(gtd, gps->inittime, pt->time, (prev_bp) ? len_v3v3(prev_bp->vec, p3d) : 0.0f);
}
prev_bp = bp;
}
/* add nurb to curve */
if (!curnu || !*curnu) {
BLI_addtail(&cu->nurb, nu);
}
if (curnu) {
*curnu = nu;
}
BKE_nurb_knot_calc_u(nu);
}
