+
+typedef struct _polydraw_internal
+{
+ double lx, ly;
+ int32_t lastx, lasty;
+ int32_t x0, y0;
+ double z;
+ char last;
+ polywriter_t writer;
+} polydraw_internal_t;
+
+static void polydraw_moveTo(gfxdrawer_t*d, gfxcoord_t _x, gfxcoord_t _y)
+{
+ polydraw_internal_t*i = (polydraw_internal_t*)d->internal;
+ int32_t x = convert_coord(_x, i->z);
+ int32_t y = convert_coord(_y, i->z);
+ if(i->lastx != x || i->lasty != y) {
+ i->writer.moveto(&i->writer, x, y);
+ }
+ i->lx = _x;
+ i->ly = _y;
+ i->x0 = x;
+ i->y0 = y;
+ i->lastx = x;
+ i->lasty = y;
+ i->last = 1;
+}
+static void polydraw_lineTo(gfxdrawer_t*d, gfxcoord_t _x, gfxcoord_t _y)
+{
+ polydraw_internal_t*i = (polydraw_internal_t*)d->internal;
+ if(!i->last) {
+ polydraw_moveTo(d, _x, _y);
+ return;
+ }
+ int32_t x = convert_coord(_x, i->z);
+ int32_t y = convert_coord(_y, i->z);
+ if(i->lastx != x || i->lasty != y) {
+ i->writer.lineto(&i->writer, x, y);
+ }
+ i->lx = _x;
+ i->ly = _y;
+ i->lastx = x;
+ i->lasty = y;
+ i->last = 1;
+}
+static void polydraw_splineTo(gfxdrawer_t*d, gfxcoord_t sx, gfxcoord_t sy, gfxcoord_t x, gfxcoord_t y)
+{
+ polydraw_internal_t*i = (polydraw_internal_t*)d->internal;
+ if(!i->last) {
+ polydraw_moveTo(d, x, y);
+ return;
+ }
+ double c = fabs(x-2*sx+i->lx) + fabs(y-2*sy+i->ly);
+ int parts = (int)(sqrt(c)*SUBFRACTION);
+ if(!parts) parts = 1;
+ int t;
+ int32_t nx,ny;
+ for(t=0;t<parts;t++) {
+ nx = convert_coord((double)(t*t*x + 2*t*(parts-t)*sx + (parts-t)*(parts-t)*i->lx)/(double)(parts*parts), i->z);
+ ny = convert_coord((double)(t*t*y + 2*t*(parts-t)*sy + (parts-t)*(parts-t)*i->ly)/(double)(parts*parts), i->z);
+ if(nx != i->lastx || ny != i->lasty) {
+ i->writer.lineto(&i->writer, nx, ny);
+ i->lastx = nx; i->lasty = ny;
+ }
+ }
+ nx = convert_coord(x,i->z);
+ ny = convert_coord(y,i->z);
+ if(nx != i->lastx || ny != i->lasty) {
+ i->writer.lineto(&i->writer, nx, ny);
+ }
+ i->lx = x;
+ i->ly = y;
+ i->lastx = nx;
+ i->lasty = ny;
+ i->last = 1;
+}
+static void polydraw_close(gfxdrawer_t*d)
+{
+ polydraw_internal_t*i = (polydraw_internal_t*)d->internal;
+ assert(!(i->last && (i->x0 == INVALID_COORD || i->y0 == INVALID_COORD)));
+ if(!i->last)
+ return;
+ if(i->lastx != i->x0 || i->lasty != i->y0) {
+ i->writer.lineto(&i->writer, i->x0, i->y0);
+ i->lastx = i->x0;
+ i->lasty = i->y0;
+ }
+ i->last = 0;
+ i->x0 = INVALID_COORD;
+ i->y0 = INVALID_COORD;
+}
+static void* polydraw_result(gfxdrawer_t*d)
+{
+ polydraw_internal_t*i = (polydraw_internal_t*)d->internal;
+ void*result = i->writer.finish(&i->writer);
+ rfx_free(i);
+ memset(d, 0, sizeof(gfxdrawer_t));
+ return result;
+}
+
+void gfxdrawer_target_poly(gfxdrawer_t*d, double gridsize)
+{
+ polydraw_internal_t*i = (polydraw_internal_t*)rfx_calloc(sizeof(polydraw_internal_t));
+ d->internal = i;
+ i->lastx = INVALID_COORD; // convert_coord can never return this value
+ i->lasty = INVALID_COORD;
+ i->x0 = INVALID_COORD;
+ i->y0 = INVALID_COORD;
+ d->moveTo = polydraw_moveTo;
+ d->lineTo = polydraw_lineTo;
+ d->splineTo = polydraw_splineTo;
+ d->close = polydraw_close;
+ d->result = polydraw_result;
+ gfxpolywriter_init(&i->writer);
+ i->writer.setgridsize(&i->writer, gridsize);
+ i->z = 1.0 / gridsize;
+}
+
+#if 0
+gfxline_t*gfxline_from_gfxpoly(gfxpoly_t*poly)
+{
+ gfxpolystroke_t*stroke;
+ int count = 0;
+ for(stroke=poly->strokes;stroke;stroke=stroke->next) {
+ assert(stroke->num_points);
+ count += stroke->num_points;
+ }
+ if(!count) return 0;
+ gfxline_t*l = malloc(sizeof(gfxline_t)*count);
+ count = 0;
+ /* TODO: it might make sense to concatenate strokes */
+ for(stroke=poly->strokes;stroke;stroke=stroke->next) {
+ int t;
+ for(t=0;t<stroke->num_points;t++) {
+ l[count+t].x = stroke->points[t].x * poly->gridsize;
+ l[count+t].y = stroke->points[t].y * poly->gridsize;
+ l[count+t].type = gfx_lineTo;
+ l[count+t].next = &l[count+t+1];
+ }
+ l[count].type = gfx_moveTo;
+ count+=stroke->num_points;
+ }
+ l[count-1].next = 0;
+ return l;
+}
+#endif
+
+static gfxline_t*mkgfxline(gfxpoly_t*poly, char preserve_direction)
+{
+ gfxpolystroke_t*stroke;
+ int count = 0;
+ if(!poly->strokes)
+ return 0;
+ dict_t*d = dict_new2(&point_type);
+ dict_t*todo = dict_new2(&ptr_type);
+ gfxpolystroke_t*stroke_min= poly->strokes;
+ int32_t x_min=stroke_min->points[0].x;
+ int32_t y_min=stroke_min->points[0].y;
+ for(stroke=poly->strokes;stroke;stroke=stroke->next) {
+ dict_put(todo, stroke, stroke);
+ assert(stroke->num_points>1);
+ count += stroke->num_points;
+ if(stroke->dir == DIR_UP) {
+ dict_put(d, &stroke->points[stroke->num_points-1], stroke);
+ if(!preserve_direction)
+ dict_put(d, &stroke->points[0], stroke);
+ } else {
+ dict_put(d, &stroke->points[0], stroke);
+ if(!preserve_direction)
+ dict_put(d, &stroke->points[stroke->num_points-1], stroke);
+ }
+ if(stroke->points[0].y < y_min ||
+ (stroke->points[0].y == y_min && stroke->points[0].x < x_min)) {
+ y_min = stroke->points[0].y;
+ stroke_min = stroke;
+ }
+ }
+ gfxpolystroke_t*next_todo = poly->strokes;
+ gfxline_t*l = malloc(sizeof(gfxline_t)*count);
+ count = 0;
+ stroke = stroke_min;
+
+ point_t last = {INVALID_COORD, INVALID_COORD};
+ char should_connect = 0;
+ while(stroke) {
+ if(stroke && !preserve_direction) {
+ char del1 = dict_del2(d, &stroke->points[0], stroke);
+ char del2 = dict_del2(d, &stroke->points[stroke->num_points-1], stroke);
+ assert(del1 && del2);
+ }
+ assert(dict_contains(todo, stroke));
+ int t;
+ int pos = 0;
+ int incr = 1;
+ if(preserve_direction) {
+ if(stroke->dir == DIR_UP) {
+ pos = stroke->num_points-1;
+ incr = -1;
+ }
+ } else {
+ // try to find matching point on either end.
+ // Prefer downward.
+ if(last.x == stroke->points[stroke->num_points-1].x &&
+ last.y == stroke->points[stroke->num_points-1].y) {
+ pos = stroke->num_points-1;
+ incr = -1;
+ }
+ }
+ if(last.x != stroke->points[pos].x || last.y != stroke->points[pos].y) {
+ l[count].x = stroke->points[pos].x * poly->gridsize;
+ l[count].y = stroke->points[pos].y * poly->gridsize;
+ l[count].type = gfx_moveTo;
+ l[count].next = &l[count+1];
+ count++;
+ assert(!should_connect);
+ }
+ pos += incr;
+ for(t=1;t<stroke->num_points;t++) {
+ l[count].x = stroke->points[pos].x * poly->gridsize;
+ l[count].y = stroke->points[pos].y * poly->gridsize;
+ l[count].type = gfx_lineTo;
+ l[count].next = &l[count+1];
+ count++;
+ pos += incr;
+ }
+ last = stroke->points[pos-incr];
+ char del = dict_del(todo, stroke);
+ assert(del);
+ assert(!dict_contains(todo, stroke));
+
+ /* try to find a poly which starts at the point we drew last */
+ stroke = dict_lookup(d, &last);
+ should_connect = 1;
+ while(!dict_contains(todo, stroke)) {
+ should_connect = 0;
+ stroke = next_todo;
+ if(!next_todo) {
+ stroke = 0;
+ break;
+ }
+ next_todo = next_todo->next;
+ }
+ }
+ l[count-1].next = 0;
+ dict_destroy(todo);
+ dict_destroy(d);
+ return l;
+}
+
+gfxline_t*gfxline_from_gfxpoly(gfxpoly_t*poly)
+{
+ return mkgfxline(poly, 0);
+}
+
+gfxline_t*gfxline_from_gfxpoly_with_direction(gfxpoly_t*poly)
+{
+ return mkgfxline(poly, 1);
+}
+
+static windcontext_t onepolygon = {1};
+gfxline_t* gfxpoly_circular_to_evenodd(gfxline_t*line, double gridsize)
+{
+ gfxpoly_t*poly = gfxpoly_from_fill(line, gridsize);
+ gfxpoly_t*poly2 = gfxpoly_process(poly, 0, &windrule_circular, &onepolygon);
+ gfxline_t*line2 = gfxline_from_gfxpoly(poly2);
+ gfxpoly_destroy(poly);
+ gfxpoly_destroy(poly2);
+ return line2;
+}
+
+gfxpoly_t* gfxpoly_createbox(double x1, double y1,double x2, double y2, double gridsize)
+{
+ gfxline_t* line = gfxline_makerectangle(x1, y1, x2, y2);
+ gfxpoly_t* poly = gfxpoly_from_fill(line, gridsize);
+ gfxline_free(line);
+ return poly;
+}
+