/*!
\brief ADD
In gsd_surf, tmesh draws polys like so:
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</pre>
UNLESS the top right or bottom left point is masked, in which case a
single triangle with the opposite diagonal is drawn. This case is
not yet handled here & should only occur on edges.
pt has X & Y coordinates in it, we interpolate Z here
This could probably be much shorter, but not much faster.
\return 1 if point is in view region
\return otherwise 0 (if masked)
*/
int viewcell_tri_interp(geosurf * gs, typbuff * buf, Point3 pt,
int check_mask)
{
Point3 p1, p2, p3;
int offset, drow, dcol, vrow, vcol;
float xmax, ymin, ymax, alpha;
xmax = VCOL2X(gs, VCOLS(gs));
ymax = VROW2Y(gs, 0);
ymin = VROW2Y(gs, VROWS(gs));
if (check_mask) {
if (gs_point_is_masked(gs, pt)) {
return (0);
}
}
if (pt[X] < 0.0 || pt[Y] > ymax) {
/* outside on left or top */
return (0);
}
if (pt[Y] < ymin || pt[X] > xmax) {
/* outside on bottom or right */
return (0);
}
if (CONST_ATT == gs_get_att_src(gs, ATT_TOPO)) {
pt[Z] = gs->att[ATT_TOPO].constant;
return (1);
}
else if (MAP_ATT != gs_get_att_src(gs, ATT_TOPO)) {
return (0);
}
vrow = Y2VROW(gs, pt[Y]);
vcol = X2VCOL(gs, pt[X]);
if (vrow < VROWS(gs) && vcol < VCOLS(gs)) {
/*not on bottom or right edge */
if (pt[X] > 0.0 && pt[Y] < ymax) {
/* not on left or top edge */
p1[X] = VCOL2X(gs, vcol + 1);
p1[Y] = VROW2Y(gs, vrow);
drow = VROW2DROW(gs, vrow);
dcol = VCOL2DCOL(gs, vcol + 1);
offset = DRC2OFF(gs, drow, dcol);
GET_MAPATT(buf, offset, p1[Z]); /* top right */
p2[X] = VCOL2X(gs, vcol);
p2[Y] = VROW2Y(gs, vrow + 1);
drow = VROW2DROW(gs, vrow + 1);
dcol = VCOL2DCOL(gs, vcol);
offset = DRC2OFF(gs, drow, dcol);
GET_MAPATT(buf, offset, p2[Z]); /* bottom left */
if ((pt[X] - p2[X]) / VXRES(gs) > (pt[Y] - p2[Y]) / VYRES(gs)) {
/* lower triangle */
p3[X] = VCOL2X(gs, vcol + 1);
p3[Y] = VROW2Y(gs, vrow + 1);
drow = VROW2DROW(gs, vrow + 1);
dcol = VCOL2DCOL(gs, vcol + 1);
offset = DRC2OFF(gs, drow, dcol);
GET_MAPATT(buf, offset, p3[Z]); /* bottom right */
}
else {
/* upper triangle */
p3[X] = VCOL2X(gs, vcol);
p3[Y] = VROW2Y(gs, vrow);
drow = VROW2DROW(gs, vrow);
dcol = VCOL2DCOL(gs, vcol);
offset = DRC2OFF(gs, drow, dcol);
GET_MAPATT(buf, offset, p3[Z]); /* top left */
}
return (Point_on_plane(p1, p2, p3, pt));
}
else if (pt[X] == 0.0) {
/* on left edge */
if (pt[Y] < ymax) {
vrow = Y2VROW(gs, pt[Y]);
drow = VROW2DROW(gs, vrow);
offset = DRC2OFF(gs, drow, 0);
GET_MAPATT(buf, offset, p1[Z]);
drow = VROW2DROW(gs, vrow + 1);
offset = DRC2OFF(gs, drow, 0);
GET_MAPATT(buf, offset, p2[Z]);
alpha = (VROW2Y(gs, vrow) - pt[Y]) / VYRES(gs);
pt[Z] = LERP(alpha, p1[Z], p2[Z]);
}
else {
/* top left corner */
GET_MAPATT(buf, 0, pt[Z]);
}
return (1);
}
else if (pt[Y] == gs->yrange) {
/* on top edge, not a corner */
vcol = X2VCOL(gs, pt[X]);
dcol = VCOL2DCOL(gs, vcol);
GET_MAPATT(buf, dcol, p1[Z]);
dcol = VCOL2DCOL(gs, vcol + 1);
GET_MAPATT(buf, dcol, p2[Z]);
alpha = (pt[X] - VCOL2X(gs, vcol)) / VXRES(gs);
pt[Z] = LERP(alpha, p1[Z], p2[Z]);
return (1);
}
}
else if (vrow == VROWS(gs)) {
/* on bottom edge */
drow = VROW2DROW(gs, VROWS(gs));
if (pt[X] > 0.0 && pt[X] < xmax) {
/* not a corner */
vcol = X2VCOL(gs, pt[X]);
dcol = VCOL2DCOL(gs, vcol);
offset = DRC2OFF(gs, drow, dcol);
GET_MAPATT(buf, offset, p1[Z]);
dcol = VCOL2DCOL(gs, vcol + 1);
offset = DRC2OFF(gs, drow, dcol);
GET_MAPATT(buf, offset, p2[Z]);
alpha = (pt[X] - VCOL2X(gs, vcol)) / VXRES(gs);
pt[Z] = LERP(alpha, p1[Z], p2[Z]);
return (1);
}
else if (pt[X] == 0.0) {
/* bottom left corner */
offset = DRC2OFF(gs, drow, 0);
GET_MAPATT(buf, offset, pt[Z]);
return (1);
}
else {
/* bottom right corner */
dcol = VCOL2DCOL(gs, VCOLS(gs));
offset = DRC2OFF(gs, drow, dcol);
GET_MAPATT(buf, offset, pt[Z]);
return (1);
}
}
else {
/* on right edge, not bottom corner */
dcol = VCOL2DCOL(gs, VCOLS(gs));
if (pt[Y] < ymax) {
vrow = Y2VROW(gs, pt[Y]);
drow = VROW2DROW(gs, vrow);
offset = DRC2OFF(gs, drow, dcol);
GET_MAPATT(buf, offset, p1[Z]);
drow = VROW2DROW(gs, vrow + 1);
offset = DRC2OFF(gs, drow, dcol);
GET_MAPATT(buf, offset, p2[Z]);
alpha = (VROW2Y(gs, vrow) - pt[Y]) / VYRES(gs);
pt[Z] = LERP(alpha, p1[Z], p2[Z]);
return (1);
}
else {
/* top right corner */
GET_MAPATT(buf, dcol, pt[Z]);
return (1);
}
}
return (0);
}
/*!
\brief ADD
Need to think about translations - If user translates surface,
sites should automatically go with it, but translating sites should
translate it relative to surface on which it's displayed
Handling mask checking here
\todo prevent scaling by 0
\param gp site (geosite)
\param gs surface (geosurf)
\param do_fast (unused)
\return 0
\return 1
*/
int gpd_2dsite(geosite * gp, geosurf * gs, int do_fast)
{
float site[3], konst;
float size;
int src, check, marker, color;
geopoint *gpt;
typbuff *buf;
GLdouble modelMatrix[16], projMatrix[16];
GLint viewport[4];
GLint window[4];
if (GS_check_cancel()) {
return (0);
}
if (gs) {
gs_update_curmask(gs);
src = gs_get_att_src(gs, ATT_TOPO);
if (src == CONST_ATT) {
konst = gs->att[ATT_TOPO].constant;
}
else {
buf = gs_get_att_typbuff(gs, ATT_TOPO, 0);
}
/* Get viewport parameters for view check */
gsd_getwindow(window, viewport, modelMatrix, projMatrix);
gsd_pushmatrix();
gsd_do_scale(1);
gsd_translate(gs->x_trans, gs->y_trans, gs->z_trans);
gsd_linewidth(gp->width);
check = 0;
color = gp->color;
marker = gp->marker;
size = gp->size;
for (gpt = gp->points; gpt; gpt = gpt->next) {
if (!(++check % CHK_FREQ)) {
if (GS_check_cancel()) {
gsd_linewidth(1);
gsd_popmatrix();
return (0);
}
}
site[X] = gpt->p3[X] + gp->x_trans - gs->ox;
site[Y] = gpt->p3[Y] + gp->y_trans - gs->oy;
if (gs_point_is_masked(gs, site)) {
continue;
}
/* TODO: set other dynamic attributes */
if (gp->attr_mode & ST_ATT_COLOR) {
color = gpt->iattr;
}
if (src == MAP_ATT) {
if (viewcell_tri_interp(gs, buf, site, 1)) {
/* returns 0 if outside or masked */
site[Z] += gp->z_trans;
if (gsd_checkpoint
(site, window, viewport, modelMatrix, projMatrix))
continue;
else
/* ACS_MODIFY_OneLine site_attr management - was: gpd_obj(gs, color, size, marker, site); */
gpd_obj_site_attr(gs, gp, gpt, site);
}
}
else if (src == CONST_ATT) {
if (gs_point_in_region(gs, site, NULL)) {
site[Z] = konst + gp->z_trans;
if (gsd_checkpoint
(site, window, viewport, modelMatrix, projMatrix))
continue;
else
/* ACS_MODIFY_OneLine site_attr management - was: gpd_obj(NULL, color, size, marker, site); */
gpd_obj_site_attr(NULL, gp, gpt, site);
}
}
}
gsd_linewidth(1);
gsd_popmatrix();
}
return (1);
}