mirror of
https://github.com/felt/tippecanoe.git
synced 2026-10-03 08:55:41 +02:00
Pull clipping and scaling code back out into clip.cpp
This commit is contained in:
Erica Fischer
+4
-752
@@ -81,374 +81,6 @@ drawvec decode_geometry(char **meta, int z, unsigned tx, unsigned ty, long long
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return out;
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}
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// @@@
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void to_tile_scale(drawvec &geom, int z, int detail) {
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if (32 - detail - z < 0) {
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for (size_t i = 0; i < geom.size(); i++) {
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geom[i].x = std::round((double) geom[i].x * (1LL << (-(32 - detail - z))));
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geom[i].y = std::round((double) geom[i].y * (1LL << (-(32 - detail - z))));
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}
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} else {
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for (size_t i = 0; i < geom.size(); i++) {
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geom[i].x = std::round((double) geom[i].x / (1LL << (32 - detail - z)));
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geom[i].y = std::round((double) geom[i].y / (1LL << (32 - detail - z)));
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}
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}
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}
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drawvec from_tile_scale(drawvec const &geom, int z, int detail) {
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drawvec out;
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for (size_t i = 0; i < geom.size(); i++) {
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draw d = geom[i];
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d.x *= (1LL << (32 - detail - z));
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d.y *= (1LL << (32 - detail - z));
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out.push_back(d);
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}
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return out;
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}
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drawvec remove_noop(drawvec geom, int type, int shift) {
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// first pass: remove empty linetos
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long long ox = 0, oy = 0;
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drawvec out;
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for (size_t i = 0; i < geom.size(); i++) {
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long long nx = std::round((double) geom[i].x / (1LL << shift));
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long long ny = std::round((double) geom[i].y / (1LL << shift));
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if (geom[i].op == VT_LINETO && nx == ox && ny == oy) {
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continue;
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}
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if (geom[i].op == VT_CLOSEPATH) {
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out.push_back(geom[i]);
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} else { /* moveto or lineto */
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out.push_back(geom[i]);
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ox = nx;
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oy = ny;
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}
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}
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// second pass: remove unused movetos
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if (type != VT_POINT) {
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geom = out;
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out.resize(0);
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for (size_t i = 0; i < geom.size(); i++) {
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if (geom[i].op == VT_MOVETO) {
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if (i + 1 >= geom.size()) {
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// followed by end-of-geometry: not needed
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continue;
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}
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if (geom[i + 1].op == VT_MOVETO) {
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// followed by another moveto: not needed
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continue;
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}
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if (geom[i + 1].op == VT_CLOSEPATH) {
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// followed by closepath: not possible
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fprintf(stderr, "Shouldn't happen\n");
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i++; // also remove unused closepath
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continue;
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}
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}
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out.push_back(geom[i]);
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}
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}
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// second pass: remove empty movetos
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if (type == VT_LINE) {
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geom = out;
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out.resize(0);
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for (size_t i = 0; i < geom.size(); i++) {
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if (i > 1 && geom[i].op == VT_MOVETO) {
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if (geom[i - 1].op == VT_LINETO &&
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std::round((double) geom[i - 1].x / (1LL << shift)) == std::round((double) geom[i].x / (1LL << shift)) &&
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std::round((double) geom[i - 1].y / (1LL << shift)) == std::round((double) geom[i].y / (1LL << shift))) {
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continue;
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}
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}
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out.push_back(geom[i]);
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}
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}
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return out;
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}
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double get_area_scaled(const drawvec &geom, size_t i, size_t j) {
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const double max_exact_double = (double) ((1LL << 53) - 1);
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// keep scaling the geometry down until we can calculate its area without overflow
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for (long long scale = 2; scale < (1LL << 30); scale *= 2) {
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long long bx = geom[i].x;
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long long by = geom[i].y;
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bool again = false;
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// https://en.wikipedia.org/wiki/Shoelace_formula
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double area = 0;
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for (size_t k = i; k < j; k++) {
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area += (double) ((geom[k].x - bx) / scale) * (double) ((geom[i + ((k - i + 1) % (j - i))].y - by) / scale);
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if (std::fabs(area) >= max_exact_double) {
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again = true;
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break;
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}
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area -= (double) ((geom[k].y - by) / scale) * (double) ((geom[i + ((k - i + 1) % (j - i))].x - bx) / scale);
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if (std::fabs(area) >= max_exact_double) {
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again = true;
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break;
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}
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}
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if (again) {
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continue;
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} else {
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area /= 2;
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return area * scale * scale;
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}
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}
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fprintf(stderr, "get_area_scaled: can't happen\n");
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exit(EXIT_IMPOSSIBLE);
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}
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double get_area(const drawvec &geom, size_t i, size_t j) {
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const double max_exact_double = (double) ((1LL << 53) - 1);
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// Coordinates in `geom` are 40-bit integers, so there is no good way
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// to multiply them without possible precision loss. Since they probably
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// do not use the full precision, shift them nearer to the origin so
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// their product is more likely to be exactly representable as a double.
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//
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// (In practice they are actually 34-bit integers: 32 bits for the
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// Mercator world plane, plus another two bits so features can stick
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// off either the left or right side. But that is still too many bits
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// for the product to fit either in a 64-bit long long or in a
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// double where the largest exact integer is 2^53.)
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//
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// If the intermediate calculation still exceeds 2^53, start trying to
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// recalculate the area by scaling down the geometry. This will not
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// produce as precise an area, but it will still be close, and the
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// sign will be correct, which is more important, since the sign
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// determines the winding order of the rings. We can then use that
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// sign with this generally more precise area calculation.
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long long bx = geom[i].x;
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long long by = geom[i].y;
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// https://en.wikipedia.org/wiki/Shoelace_formula
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double area = 0;
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bool overflow = false;
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for (size_t k = i; k < j; k++) {
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area += (double) (geom[k].x - bx) * (double) (geom[i + ((k - i + 1) % (j - i))].y - by);
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if (std::fabs(area) >= max_exact_double) {
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overflow = true;
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}
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area -= (double) (geom[k].y - by) * (double) (geom[i + ((k - i + 1) % (j - i))].x - bx);
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if (std::fabs(area) >= max_exact_double) {
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overflow = true;
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}
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}
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area /= 2;
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if (overflow) {
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double scaled_area = get_area_scaled(geom, i, j);
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if ((area < 0 && scaled_area > 0) || (area > 0 && scaled_area < 0)) {
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area = -area;
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}
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}
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return area;
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}
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double get_mp_area(drawvec &geom) {
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double ret = 0;
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for (size_t i = 0; i < geom.size(); i++) {
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if (geom[i].op == VT_MOVETO) {
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size_t j;
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for (j = i + 1; j < geom.size(); j++) {
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if (geom[j].op != VT_LINETO) {
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break;
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}
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}
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ret += get_area(geom, i, j);
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i = j - 1;
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}
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}
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return ret;
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}
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static void decode_clipped(mapbox::geometry::multi_polygon<long long> &t, drawvec &out, double scale) {
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out.clear();
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for (size_t i = 0; i < t.size(); i++) {
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for (size_t j = 0; j < t[i].size(); j++) {
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drawvec ring;
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for (size_t k = 0; k < t[i][j].size(); k++) {
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ring.push_back(draw((k == 0) ? VT_MOVETO : VT_LINETO, std::round(t[i][j][k].x / scale), std::round(t[i][j][k].y / scale)));
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}
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if (ring.size() > 0 && ring[ring.size() - 1] != ring[0]) {
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fprintf(stderr, "Had to close ring\n");
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ring.push_back(draw(VT_LINETO, ring[0].x, ring[0].y));
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}
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double area = get_area(ring, 0, ring.size());
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if ((j == 0 && area < 0) || (j != 0 && area > 0)) {
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fprintf(stderr, "Ring area has wrong sign: %f for %zu\n", area, j);
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exit(EXIT_IMPOSSIBLE);
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}
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for (size_t k = 0; k < ring.size(); k++) {
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out.push_back(ring[k]);
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}
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}
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}
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}
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drawvec clean_or_clip_poly(drawvec &geom, int z, int buffer, bool clip, bool try_scaling) {
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geom = remove_noop(geom, VT_POLYGON, 0);
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mapbox::geometry::multi_polygon<long long> result;
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double scale = 16.0;
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if (!try_scaling) {
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scale = 1.0;
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}
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bool again = true;
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while (again) {
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mapbox::geometry::wagyu::wagyu<long long> wagyu;
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again = false;
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for (size_t i = 0; i < geom.size(); i++) {
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if (geom[i].op == VT_MOVETO) {
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size_t j;
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for (j = i + 1; j < geom.size(); j++) {
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if (geom[j].op != VT_LINETO) {
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break;
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}
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}
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if (j >= i + 4) {
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mapbox::geometry::linear_ring<long long> lr;
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for (size_t k = i; k < j; k++) {
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lr.push_back(mapbox::geometry::point<long long>(geom[k].x * scale, geom[k].y * scale));
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}
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if (lr.size() >= 3) {
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wagyu.add_ring(lr);
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}
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}
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i = j - 1;
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}
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}
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if (clip) {
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long long area = 0xFFFFFFFF;
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if (z != 0) {
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area = 1LL << (32 - z);
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}
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long long clip_buffer = buffer * area / 256;
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mapbox::geometry::linear_ring<long long> lr;
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lr.push_back(mapbox::geometry::point<long long>(scale * -clip_buffer, scale * -clip_buffer));
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lr.push_back(mapbox::geometry::point<long long>(scale * -clip_buffer, scale * (area + clip_buffer)));
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lr.push_back(mapbox::geometry::point<long long>(scale * (area + clip_buffer), scale * (area + clip_buffer)));
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lr.push_back(mapbox::geometry::point<long long>(scale * (area + clip_buffer), scale * -clip_buffer));
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lr.push_back(mapbox::geometry::point<long long>(scale * -clip_buffer, scale * -clip_buffer));
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wagyu.add_ring(lr, mapbox::geometry::wagyu::polygon_type_clip);
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}
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try {
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result.clear();
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wagyu.execute(mapbox::geometry::wagyu::clip_type_union, result, mapbox::geometry::wagyu::fill_type_positive, mapbox::geometry::wagyu::fill_type_positive);
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} catch (std::runtime_error &e) {
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FILE *f = fopen("/tmp/wagyu.log", "w");
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fprintf(f, "%s\n", e.what());
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fprintf(stderr, "%s\n", e.what());
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fprintf(f, "[");
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for (size_t i = 0; i < geom.size(); i++) {
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if (geom[i].op == VT_MOVETO) {
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size_t j;
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for (j = i + 1; j < geom.size(); j++) {
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if (geom[j].op != VT_LINETO) {
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break;
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}
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}
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if (j >= i + 4) {
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mapbox::geometry::linear_ring<long long> lr;
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if (i != 0) {
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fprintf(f, ",");
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}
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fprintf(f, "[");
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for (size_t k = i; k < j; k++) {
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lr.push_back(mapbox::geometry::point<long long>(geom[k].x, geom[k].y));
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if (k != i) {
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fprintf(f, ",");
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}
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fprintf(f, "[%lld,%lld]", geom[k].x, geom[k].y);
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}
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fprintf(f, "]");
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if (lr.size() >= 3) {
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}
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}
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i = j - 1;
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}
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}
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fprintf(f, "]");
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fprintf(f, "\n\n\n\n\n");
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fclose(f);
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fprintf(stderr, "Internal error: Polygon cleaning failed. Log in /tmp/wagyu.log\n");
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exit(EXIT_IMPOSSIBLE);
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}
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if (scale != 1) {
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for (auto const &outer : result) {
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for (auto const &ring : outer) {
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for (auto const &p : ring) {
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if (p.x / scale != std::round(p.x / scale) ||
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p.y / scale != std::round(p.y / scale)) {
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scale = 1;
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again = true;
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break;
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}
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}
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}
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}
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}
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}
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drawvec ret;
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decode_clipped(result, ret, scale);
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return ret;
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}
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// @@@
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/* pnpoly:
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Copyright (c) 1970-2003, Wm. Randolph Franklin
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@@ -556,234 +188,6 @@ void check_polygon(drawvec &geom) {
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}
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}
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// @@@
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drawvec close_poly(drawvec &geom) {
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drawvec out;
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for (size_t i = 0; i < geom.size(); i++) {
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if (geom[i].op == VT_MOVETO) {
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size_t j;
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for (j = i + 1; j < geom.size(); j++) {
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if (geom[j].op != VT_LINETO) {
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break;
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}
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}
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if (j - 1 > i) {
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if (geom[j - 1].x != geom[i].x || geom[j - 1].y != geom[i].y) {
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fprintf(stderr, "Internal error: polygon not closed\n");
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}
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}
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for (size_t n = i; n < j - 1; n++) {
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out.push_back(geom[n]);
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}
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out.push_back(draw(VT_CLOSEPATH, 0, 0));
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i = j - 1;
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}
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}
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return out;
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}
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static bool inside(std::pair<double, double> d, int edge, long long minx, long long miny, long long maxx, long long maxy) {
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switch (edge) {
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case 0: // top
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return d.second > miny;
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case 1: // right
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return d.first < maxx;
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case 2: // bottom
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return d.second < maxy;
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case 3: // left
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return d.first > minx;
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}
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fprintf(stderr, "internal error inside\n");
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exit(EXIT_FAILURE);
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}
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static std::pair<double, double> intersect(std::pair<double, double> a, std::pair<double, double> b, int edge, long long minx, long long miny, long long maxx, long long maxy) {
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switch (edge) {
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case 0: // top
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return std::pair<double, double>((a.first + (double) (b.first - a.first) * (miny - a.second) / (b.second - a.second)), miny);
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case 1: // right
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return std::pair<double, double>(maxx, (a.second + (double) (b.second - a.second) * (maxx - a.first) / (b.first - a.first)));
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case 2: // bottom
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return std::pair<double, double>((a.first + (double) (b.first - a.first) * (maxy - a.second) / (b.second - a.second)), maxy);
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case 3: // left
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return std::pair<double, double>(minx, (a.second + (double) (b.second - a.second) * (minx - a.first) / (b.first - a.first)));
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}
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fprintf(stderr, "internal error intersecting\n");
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exit(EXIT_FAILURE);
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}
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// http://en.wikipedia.org/wiki/Sutherland%E2%80%93Hodgman_algorithm
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static std::vector<std::pair<double, double>> clip_poly1(std::vector<std::pair<double, double>> &geom,
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||||
long long minx, long long miny, long long maxx, long long maxy,
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||||
long long ax, long long ay, long long bx, long long by, drawvec &edge_nodes) {
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||||
std::vector<std::pair<double, double>> out = geom;
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||||
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||||
for (int edge = 0; edge < 4; edge++) {
|
||||
if (out.size() > 0) {
|
||||
std::vector<std::pair<double, double>> in = out;
|
||||
out.resize(0);
|
||||
|
||||
std::pair<double, double> S = in[in.size() - 1];
|
||||
|
||||
for (size_t e = 0; e < in.size(); e++) {
|
||||
std::pair<double, double> E = in[e];
|
||||
|
||||
if (!inside(S, edge, minx, miny, maxx, maxy)) {
|
||||
// was outside the buffer
|
||||
|
||||
if (!inside(E, edge, minx, miny, maxx, maxy)) {
|
||||
// still outside the buffer
|
||||
} else if (!inside(E, edge, ax, ay, bx, by)) {
|
||||
// outside the tile but inside the buffer
|
||||
out.push_back(intersect(S, E, edge, minx, miny, maxx, maxy)); // on buffer edge
|
||||
out.push_back(E);
|
||||
} else {
|
||||
out.push_back(intersect(S, E, edge, minx, miny, maxx, maxy)); // on buffer edge
|
||||
if (prevent[P_SIMPLIFY_SHARED_NODES]) {
|
||||
out.push_back(intersect(S, E, edge, ax, ay, bx, by)); // on tile boundary
|
||||
edge_nodes.push_back(draw(VT_MOVETO, std::round(out.back().first), std::round(out.back().second)));
|
||||
}
|
||||
out.push_back(E);
|
||||
}
|
||||
} else if (!inside(S, edge, ax, ay, bx, by)) {
|
||||
// was inside the buffer but outside the tile edge
|
||||
|
||||
if (!inside(E, edge, minx, miny, maxx, maxy)) {
|
||||
// now outside the buffer
|
||||
out.push_back(intersect(S, E, edge, minx, miny, maxx, maxy)); // on buffer edge
|
||||
} else if (!inside(E, edge, ax, ay, bx, by)) {
|
||||
// still outside the tile edge but inside the buffer
|
||||
out.push_back(E);
|
||||
} else {
|
||||
// now inside the tile
|
||||
if (prevent[P_SIMPLIFY_SHARED_NODES]) {
|
||||
out.push_back(intersect(S, E, edge, ax, ay, bx, by)); // on tile boundary
|
||||
edge_nodes.push_back(draw(VT_MOVETO, std::round(out.back().first), std::round(out.back().second)));
|
||||
}
|
||||
out.push_back(E);
|
||||
}
|
||||
} else {
|
||||
// was inside the tile
|
||||
|
||||
if (!inside(E, edge, minx, miny, maxx, maxy)) {
|
||||
// now outside the buffer
|
||||
if (prevent[P_SIMPLIFY_SHARED_NODES]) {
|
||||
out.push_back(intersect(S, E, edge, ax, ay, bx, by)); // on tile boundary
|
||||
edge_nodes.push_back(draw(VT_MOVETO, std::round(out.back().first), std::round(out.back().second)));
|
||||
}
|
||||
out.push_back(intersect(S, E, edge, minx, miny, maxx, maxy)); // on buffer edge
|
||||
} else if (!inside(E, edge, ax, ay, bx, by)) {
|
||||
// now inside the buffer but outside the tile edge
|
||||
if (prevent[P_SIMPLIFY_SHARED_NODES]) {
|
||||
out.push_back(intersect(S, E, edge, ax, ay, bx, by)); // on tile boundary
|
||||
edge_nodes.push_back(draw(VT_MOVETO, std::round(out.back().first), std::round(out.back().second)));
|
||||
}
|
||||
out.push_back(E);
|
||||
} else {
|
||||
// still inside the tile
|
||||
out.push_back(E);
|
||||
}
|
||||
}
|
||||
|
||||
S = E;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (out.size() > 0) {
|
||||
// If the polygon begins and ends outside the edge,
|
||||
// the starting and ending points will be left as the
|
||||
// places where it intersects the edge. Need to add
|
||||
// another point to close the loop.
|
||||
|
||||
if (out[0].first != out[out.size() - 1].first || out[0].second != out[out.size() - 1].second) {
|
||||
out.push_back(out[0]);
|
||||
}
|
||||
|
||||
if (out.size() < 3) {
|
||||
// fprintf(stderr, "Polygon degenerated to a line segment\n");
|
||||
out.clear();
|
||||
return out;
|
||||
}
|
||||
}
|
||||
|
||||
return out;
|
||||
}
|
||||
|
||||
drawvec simple_clip_poly(drawvec &geom, long long minx, long long miny, long long maxx, long long maxy,
|
||||
long long ax, long long ay, long long bx, long long by, drawvec &edge_nodes) {
|
||||
drawvec out;
|
||||
if (prevent[P_SIMPLIFY_SHARED_NODES]) {
|
||||
geom = remove_noop(geom, VT_POLYGON, 0);
|
||||
}
|
||||
|
||||
for (size_t i = 0; i < geom.size(); i++) {
|
||||
if (geom[i].op == VT_MOVETO) {
|
||||
size_t j;
|
||||
for (j = i + 1; j < geom.size(); j++) {
|
||||
if (geom[j].op != VT_LINETO) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
std::vector<std::pair<double, double>> tmp;
|
||||
for (size_t k = i; k < j; k++) {
|
||||
double x = geom[k].x;
|
||||
double y = geom[k].y;
|
||||
tmp.emplace_back(x, y);
|
||||
}
|
||||
tmp = clip_poly1(tmp, minx, miny, maxx, maxy, ax, ay, bx, by, edge_nodes);
|
||||
if (tmp.size() > 0) {
|
||||
if (tmp[0].first != tmp[tmp.size() - 1].first || tmp[0].second != tmp[tmp.size() - 1].second) {
|
||||
fprintf(stderr, "Internal error: Polygon ring not closed\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
}
|
||||
for (size_t k = 0; k < tmp.size(); k++) {
|
||||
if (k == 0) {
|
||||
out.push_back(draw(VT_MOVETO, std::round(tmp[k].first), std::round(tmp[k].second)));
|
||||
} else {
|
||||
out.push_back(draw(VT_LINETO, std::round(tmp[k].first), std::round(tmp[k].second)));
|
||||
}
|
||||
}
|
||||
|
||||
i = j - 1;
|
||||
} else {
|
||||
fprintf(stderr, "Unexpected operation in polygon %d\n", (int) geom[i].op);
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
}
|
||||
|
||||
return out;
|
||||
}
|
||||
|
||||
drawvec simple_clip_poly(drawvec &geom, long long minx, long long miny, long long maxx, long long maxy) {
|
||||
drawvec dv;
|
||||
return simple_clip_poly(geom, minx, miny, maxx, maxy, minx, miny, maxx, maxy, dv);
|
||||
}
|
||||
|
||||
drawvec simple_clip_poly(drawvec &geom, int z, int buffer, drawvec &edge_nodes) {
|
||||
long long area = 1LL << (32 - z);
|
||||
long long clip_buffer = buffer * area / 256;
|
||||
|
||||
return simple_clip_poly(geom, -clip_buffer, -clip_buffer, area + clip_buffer, area + clip_buffer,
|
||||
0, 0, area, area, edge_nodes);
|
||||
}
|
||||
// @@@
|
||||
|
||||
drawvec reduce_tiny_poly(drawvec &geom, int z, int detail, bool *still_needs_simplification, bool *reduced_away, double *accum_area, serial_feature *this_feature, serial_feature *tiny_feature) {
|
||||
drawvec out;
|
||||
const double pixel = (1LL << (32 - detail - z)) * (double) tiny_polygon_size;
|
||||
@@ -904,30 +308,6 @@ drawvec reduce_tiny_poly(drawvec &geom, int z, int detail, bool *still_needs_sim
|
||||
return out;
|
||||
}
|
||||
|
||||
// @@@
|
||||
drawvec clip_point(drawvec &geom, int z, long long buffer) {
|
||||
long long min = 0;
|
||||
long long area = 1LL << (32 - z);
|
||||
|
||||
min -= buffer * area / 256;
|
||||
area += buffer * area / 256;
|
||||
|
||||
return clip_point(geom, min, min, area, area);
|
||||
}
|
||||
|
||||
drawvec clip_point(drawvec &geom, long long minx, long long miny, long long maxx, long long maxy) {
|
||||
drawvec out;
|
||||
|
||||
for (size_t i = 0; i < geom.size(); i++) {
|
||||
if (geom[i].x >= minx && geom[i].y >= miny && geom[i].x <= maxx && geom[i].y <= maxy) {
|
||||
out.push_back(geom[i]);
|
||||
}
|
||||
}
|
||||
|
||||
return out;
|
||||
}
|
||||
// @@@
|
||||
|
||||
int quick_check(long long *bbox, int z, long long buffer) {
|
||||
long long min = 0;
|
||||
long long area = 1LL << (32 - z);
|
||||
@@ -966,47 +346,6 @@ bool point_within_tile(long long x, long long y, int z) {
|
||||
return x >= 0 && y >= 0 && x < area && y < area;
|
||||
}
|
||||
|
||||
// @@@
|
||||
drawvec clip_lines(drawvec &geom, int z, long long buffer) {
|
||||
long long min = 0;
|
||||
long long area = 1LL << (32 - z);
|
||||
min -= buffer * area / 256;
|
||||
area += buffer * area / 256;
|
||||
|
||||
return clip_lines(geom, min, min, area, area);
|
||||
}
|
||||
|
||||
drawvec clip_lines(drawvec &geom, long long minx, long long miny, long long maxx, long long maxy) {
|
||||
drawvec out;
|
||||
|
||||
for (size_t i = 0; i < geom.size(); i++) {
|
||||
if (i > 0 && (geom[i - 1].op == VT_MOVETO || geom[i - 1].op == VT_LINETO) && geom[i].op == VT_LINETO) {
|
||||
long long x1 = geom[i - 1].x;
|
||||
long long y1 = geom[i - 1].y;
|
||||
|
||||
long long x2 = geom[i - 0].x;
|
||||
long long y2 = geom[i - 0].y;
|
||||
|
||||
int c = clip(&x1, &y1, &x2, &y2, minx, miny, maxx, maxy);
|
||||
|
||||
if (c > 1) { // clipped
|
||||
out.push_back(draw(VT_MOVETO, std::round(x1), std::round(y1)));
|
||||
out.push_back(draw(VT_LINETO, std::round(x2), std::round(y2)));
|
||||
out.push_back(draw(VT_MOVETO, geom[i].x, geom[i].y));
|
||||
} else if (c == 1) { // unchanged
|
||||
out.push_back(geom[i]);
|
||||
} else { // clipped away entirely
|
||||
out.push_back(draw(VT_MOVETO, geom[i].x, geom[i].y));
|
||||
}
|
||||
} else {
|
||||
out.push_back(geom[i]);
|
||||
}
|
||||
}
|
||||
|
||||
return out;
|
||||
}
|
||||
// @@@
|
||||
|
||||
static long long square_distance_from_line_fp(long long point_x, long long point_y, long long segA_x, long long segA_y, long long segB_x, long long segB_y) {
|
||||
long long p2x = segB_x - segA_x;
|
||||
long long p2y = segB_y - segA_y;
|
||||
@@ -1515,14 +854,14 @@ std::vector<drawvec> chop_polygon(std::vector<drawvec> &geoms) {
|
||||
|
||||
if (maxy - miny > maxx - minx) {
|
||||
// printf("clipping y to %lld %lld %lld %lld\n", minx, miny, maxx, midy);
|
||||
c1 = simple_clip_poly(geoms[i], minx, miny, maxx, midy);
|
||||
c1 = simple_clip_poly(geoms[i], minx, miny, maxx, midy, prevent[P_SIMPLIFY_EDGE_NODES]);
|
||||
// printf(" and %lld %lld %lld %lld\n", minx, midy, maxx, maxy);
|
||||
c2 = simple_clip_poly(geoms[i], minx, midy, maxx, maxy);
|
||||
c2 = simple_clip_poly(geoms[i], minx, midy, maxx, maxy, prevent[P_SIMPLIFY_EDGE_NODES]);
|
||||
} else {
|
||||
// printf("clipping x to %lld %lld %lld %lld\n", minx, miny, midx, maxy);
|
||||
c1 = simple_clip_poly(geoms[i], minx, miny, midx, maxy);
|
||||
c1 = simple_clip_poly(geoms[i], minx, miny, midx, maxy, prevent[P_SIMPLIFY_EDGE_NODES]);
|
||||
// printf(" and %lld %lld %lld %lld\n", midx, midy, maxx, maxy);
|
||||
c2 = simple_clip_poly(geoms[i], midx, miny, maxx, maxy);
|
||||
c2 = simple_clip_poly(geoms[i], midx, miny, maxx, maxy, prevent[P_SIMPLIFY_EDGE_NODES]);
|
||||
}
|
||||
|
||||
if (c1.size() >= geoms[i].size()) {
|
||||
@@ -1551,93 +890,6 @@ std::vector<drawvec> chop_polygon(std::vector<drawvec> &geoms) {
|
||||
}
|
||||
#endif
|
||||
|
||||
// @@@
|
||||
#define INSIDE 0
|
||||
#define LEFT 1
|
||||
#define RIGHT 2
|
||||
#define BOTTOM 4
|
||||
#define TOP 8
|
||||
|
||||
static int computeOutCode(long long x, long long y, long long xmin, long long ymin, long long xmax, long long ymax) {
|
||||
int code = INSIDE;
|
||||
|
||||
if (x < xmin) {
|
||||
code |= LEFT;
|
||||
} else if (x > xmax) {
|
||||
code |= RIGHT;
|
||||
}
|
||||
|
||||
if (y < ymin) {
|
||||
code |= BOTTOM;
|
||||
} else if (y > ymax) {
|
||||
code |= TOP;
|
||||
}
|
||||
|
||||
return code;
|
||||
}
|
||||
|
||||
int clip(long long *x0, long long *y0, long long *x1, long long *y1, long long xmin, long long ymin, long long xmax, long long ymax) {
|
||||
int outcode0 = computeOutCode(*x0, *y0, xmin, ymin, xmax, ymax);
|
||||
int outcode1 = computeOutCode(*x1, *y1, xmin, ymin, xmax, ymax);
|
||||
int accept = 0;
|
||||
int changed = 0;
|
||||
|
||||
while (1) {
|
||||
if (!(outcode0 | outcode1)) { // Bitwise OR is 0. Trivially accept and get out of loop
|
||||
accept = 1;
|
||||
break;
|
||||
} else if (outcode0 & outcode1) { // Bitwise AND is not 0. Trivially reject and get out of loop
|
||||
break;
|
||||
} else {
|
||||
// failed both tests, so calculate the line segment to clip
|
||||
// from an outside point to an intersection with clip edge
|
||||
long long x = *x0, y = *y0;
|
||||
|
||||
// At least one endpoint is outside the clip rectangle; pick it.
|
||||
int outcodeOut = outcode0 ? outcode0 : outcode1;
|
||||
|
||||
// XXX truncating division
|
||||
|
||||
// Now find the intersection point;
|
||||
// use formulas y = y0 + slope * (x - x0), x = x0 + (1 / slope) * (y - y0)
|
||||
if (outcodeOut & TOP) { // point is above the clip rectangle
|
||||
x = *x0 + (*x1 - *x0) * (ymax - *y0) / (*y1 - *y0);
|
||||
y = ymax;
|
||||
} else if (outcodeOut & BOTTOM) { // point is below the clip rectangle
|
||||
x = *x0 + (*x1 - *x0) * (ymin - *y0) / (*y1 - *y0);
|
||||
y = ymin;
|
||||
} else if (outcodeOut & RIGHT) { // point is to the right of clip rectangle
|
||||
y = *y0 + (*y1 - *y0) * (xmax - *x0) / (*x1 - *x0);
|
||||
x = xmax;
|
||||
} else if (outcodeOut & LEFT) { // point is to the left of clip rectangle
|
||||
y = *y0 + (*y1 - *y0) * (xmin - *x0) / (*x1 - *x0);
|
||||
x = xmin;
|
||||
}
|
||||
|
||||
// Now we move outside point to intersection point to clip
|
||||
// and get ready for next pass.
|
||||
if (outcodeOut == outcode0) {
|
||||
*x0 = x;
|
||||
*y0 = y;
|
||||
outcode0 = computeOutCode(*x0, *y0, xmin, ymin, xmax, ymax);
|
||||
changed = 1;
|
||||
} else {
|
||||
*x1 = x;
|
||||
*y1 = y;
|
||||
outcode1 = computeOutCode(*x1, *y1, xmin, ymin, xmax, ymax);
|
||||
changed = 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (accept == 0) {
|
||||
return 0;
|
||||
} else {
|
||||
return changed + 1;
|
||||
}
|
||||
}
|
||||
// @@@
|
||||
|
||||
drawvec stairstep(drawvec &geom, int z, int detail) {
|
||||
drawvec out;
|
||||
double scale = 1 << (32 - detail - z);
|
||||
|
||||
Reference in New Issue
Block a user