static inline int32_t convert_coord(double x, double z)
{
- /* we clamp to 31 bit instead of 32 bit because we use
- a (x1-x2) shortcut when comparing coordinates
+ /* we clamp to 26 bit because:
+ a) we use a (x1-x2) shortcut when comparing coordinates
+ b) we need to be able to multiply two coordinates and store them in a double w/o loss of precision
*/
x *= z;
- if(x < -0x40000000) x = -0x40000000;
- if(x > 0x3fffffff) x = 0x3fffffff;
+ if(x < -0x2000000) x = -0x2000000;
+ if(x > 0x1ffffff) x = 0x1ffffff;
return ceil(x);
}
{
double lx, ly;
int32_t lastx, lasty;
+ int32_t x0, y0;
double z;
char last;
polywriter_t writer;
}
i->lx = _x;
i->ly = _y;
+ i->x0 = x;
+ i->y0 = y;
i->lastx = x;
i->lasty = y;
i->last = 1;
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;
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);
return 0;
dict_t*d = dict_new2(&point_type);
dict_t*todo = dict_new2(&ptr_type);
+ gfxpolystroke_t*stroke_min= poly->strokes;
+ 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);
} else {
dict_put(d, &stroke->points[0], stroke);
}
+ if(stroke->points[0].y < y_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 = poly->strokes;
+ stroke = stroke_min;
+
point_t last = {INVALID_COORD, INVALID_COORD};
+ char should_connect = 0;
while(stroke) {
assert(dict_contains(todo, stroke));
int t;
pos = stroke->num_points-1;
incr = -1;
}
+ /* TODO: keeping the up/down order intact increases the polygon size
+ considerably. If this is going to be an even/odd polygon,
+ we could ignore it and save some space */
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++) {
/* 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;