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Most of the way toward serializing the drawing operations

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This commit is contained in:
Eric Fischer 2014-09-16 13:51:22 -07:00
parent 33747bdfd8
commit e82edb90a3
1 changed files with 64 additions and 19 deletions
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83
geojson.c
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@ -25,6 +25,10 @@
#define MB_GEOM_LINE 2
#define MB_GEOM_POLYGON 3
#define OP_MOVETO 1
#define OP_LINETO 2
#define OP_CLOSEPATH 7
char *geometry_names[GEOM_TYPES] = {
"Point",
"MultiPoint",
@ -66,7 +70,7 @@ void latlon2tile(double lat, double lon, int zoom, unsigned int *x, unsigned int
*y = n * (1 - (log(tan(lat_rad) + 1/cos(lat_rad)) / M_PI)) / 2;
}
void parse_geometry(int t, json_object *j, unsigned *bbox) {
void parse_geometry(int t, json_object *j, unsigned *bbox, int *n, unsigned **out) {
if (j == NULL || j->type != JSON_ARRAY) {
fprintf(stderr, "expected array for type %d\n", t);
return;
@ -78,34 +82,58 @@ void parse_geometry(int t, json_object *j, unsigned *bbox) {
int i;
for (i = 0; i < j->length; i++) {
if (within == GEOM_POINT) {
int op;
if (i == 0 || t == GEOM_MULTIPOINT) {
op = OP_MOVETO;
printf(" moveto ");
} else {
op = OP_LINETO;
printf(" lineto ");
}
if (n != NULL) {
(*n)++;
}
if (out != NULL) {
**out = op;
(*out)++;
}
}
parse_geometry(within, j->array[i], bbox);
parse_geometry(within, j->array[i], bbox, n, out);
}
printf("]");
} else {
if (j->length == 2 && j->array[0]->type == JSON_NUMBER && j->array[1]->type == JSON_NUMBER) {
unsigned x, y;
double lon = j->array[0]->number;
double lat = j->array[1]->number;
latlon2tile(lat, lon, 32, &x, &y);
if (out != NULL || bbox != NULL) {
unsigned x, y;
double lon = j->array[0]->number;
double lat = j->array[1]->number;
latlon2tile(lat, lon, 32, &x, &y);
if (x < bbox[0]) {
bbox[0] = x;
}
if (y < bbox[1]) {
bbox[1] = y;
}
if (x > bbox[2]) {
bbox[2] = x;
}
if (y > bbox[3]) {
bbox[3] = y;
if (bbox != NULL) {
if (x < bbox[0]) {
bbox[0] = x;
}
if (y < bbox[1]) {
bbox[1] = y;
}
if (x > bbox[2]) {
bbox[2] = x;
}
if (y > bbox[3]) {
bbox[3] = y;
}
}
if (out != NULL) {
(*out)[0] = x;
(*out)[1] = y;
(*out) += 2;
}
if (n != NULL) {
*n += 2;
}
}
printf(" %f,%f ", j->array[0]->number, j->array[1]->number);
@ -115,6 +143,13 @@ void parse_geometry(int t, json_object *j, unsigned *bbox) {
}
if (t == GEOM_POLYGON) {
if (out != NULL) {
(*out)[0] = OP_CLOSEPATH;
(*out) += 1;
}
if (n != NULL) {
*n += 1;
}
printf(" closepath ");
}
}
@ -205,12 +240,22 @@ void read_json(FILE *f) {
}
unsigned bbox[] = { UINT_MAX, UINT_MAX, 0, 0 };
int n = 0;
printf("%d: ", mb_geometry[t]);
parse_geometry(t, coordinates, bbox);
parse_geometry(t, coordinates, bbox, &n, NULL);
printf("\n");
printf("bbox %x %x %x %x\n", bbox[0], bbox[1], bbox[2], bbox[3]);
unsigned out[n];
unsigned *end = out;
parse_geometry(t, coordinates, NULL, NULL, &end);
printf("\n-> ");
for (i = 0; i < n; i++) {
printf("%x ", out[i]);
}
printf("\n");
printf("%d elements, bbox %x %x %x %x\n", n, bbox[0], bbox[1], bbox[2], bbox[3]);
}
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