Trygve/contour-creator
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use lookuptable to draw lines

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Trygve 2024-05-07 17:20:23 +02:00
parent 5845ae6693
commit 62d62987d3
1 changed files with 59 additions and 22 deletions
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81
src/main.cpp
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@ -8,6 +8,8 @@
#include <gdal/ogr_geometry.h> #include <gdal/ogr_geometry.h>
#include <iostream> #include <iostream>
#include <ostream> #include <ostream>
#include <sys/types.h>
#include <tuple>
#include <vector> #include <vector>
#include <cstdint> #include <cstdint>
#include <gdal/gdal.h> #include <gdal/gdal.h>
@ -69,10 +71,8 @@ std::vector<std::vector<Point>> create_lines(HeightMap* heightmap, int interval)
for (int j = 0; j < points.size(); j++){ for (int j = 0; j < points.size(); j++){
for (int k = 0; k < points.size(); k++){ for (int k = 0; k < points.size(); k++){
Point* candidate = &points[k]; Point* candidate = &points[k];
if (!candidate->allocated) { if (!candidate->allocated) {
if (candidate->x == x +1 && candidate->y == y && is_in(current_case, east)) { if (candidate->x == x +1 && candidate->y == y /*&& is_in(current_case, east)*/) {
candidate->allocated = true; candidate->allocated = true;
x = candidate->x; x = candidate->x;
y = candidate->y; y = candidate->y;
@ -81,7 +81,7 @@ std::vector<std::vector<Point>> create_lines(HeightMap* heightmap, int interval)
points_allocated++; points_allocated++;
break; break;
} }
else if (candidate->x == x -1 && candidate->y == y && is_in(current_case, west)) { else if (candidate->x == x -1 && candidate->y == y /*&& is_in(current_case, west)*/) {
x = candidate->x; x = candidate->x;
y = candidate->y; y = candidate->y;
current_case = candidate->mscase; current_case = candidate->mscase;
@ -90,7 +90,7 @@ std::vector<std::vector<Point>> create_lines(HeightMap* heightmap, int interval)
points_allocated++; points_allocated++;
break; break;
} }
else if (candidate->x == x && candidate->y == y + 1 && is_in(current_case, north)) { else if (candidate->x == x && candidate->y == y + 1 /*&& is_in(current_case, north)*/) {
x = candidate->x; x = candidate->x;
y = candidate->y; y = candidate->y;
current_case = candidate->mscase; current_case = candidate->mscase;
@ -99,7 +99,7 @@ std::vector<std::vector<Point>> create_lines(HeightMap* heightmap, int interval)
points_allocated++; points_allocated++;
break; break;
} }
else if (candidate->x == x && candidate->y == y - 1 && is_in(current_case, south)) { else if (candidate->x == x && candidate->y == y - 1 /*&& is_in(current_case, south)*/) {
x = candidate->x; x = candidate->x;
y = candidate->y; y = candidate->y;
current_case = candidate->mscase; current_case = candidate->mscase;
@ -120,6 +120,7 @@ std::vector<std::vector<Point>> create_lines(HeightMap* heightmap, int interval)
if (!candidate->allocated) if (!candidate->allocated)
{ {
line.push_back(*candidate); line.push_back(*candidate);
candidate->allocated = true;
x = candidate->x; x = candidate->x;
y = candidate->y; y = candidate->y;
current_case = candidate->mscase; current_case = candidate->mscase;
@ -150,20 +151,29 @@ std::tuple<double, double> local_to_projected(double* geotransform, int x, int y
constexpr std::tuple<double, double, double, double> marching_squares_lookup(int mcase) constexpr std::tuple<double, double, double, double> marching_squares_lookup(int mcase)
{ {
switch (mcase) { switch (mcase) {
case 1: return {0, 0.5, 0.5, 0}; case 1:
case 2: return {1, 0.5, 0.5, 0}; case 14:
case 3: return {0, 0.5, 1, 0.5}; return {0, 0.5, 0.5, 0};
case 4: return {0.5, 1, 1, 0.5}; case 2:
case 5: return {0, 0, 0, 0}; //FIXME return {0.5, 0, 1, 0.5};
case 6: return {0.5, 1, 0.5, 0}; case 3:
case 7: return {0, 0.5, 0.5, 1}; case 12:
case 8: return {0, 0.5, 0.5, 1}; return {0, 0.5, 1, 0.5};
case 9: return {0.5, 1, 0.5, 0}; case 4:
case 10: return {0, 0, 0, 0}; //FIXME case 11:
case 11: return {0.5, 1, 1, 0.5}; return {0.5, 1, 1, 0.5};
case 12: return {0, 0.5, 1, 0.5}; case 5:
case 13: return {0.5, 0, 1, 0.5}; case 10:
case 14: return {0, 0.5, 0.5, 0}; return {0, 0, 0, 0}; //FIXME
case 6:
case 9:
return {0.5, 1, 0.5, 0};
case 7:
case 8:
return {0, 0.5, 0.5, 1};
case 13:
return {1, 0.5, 0.5, 0};
}; };
} }
void write_output_file(std::vector<std::vector<Point>> all_points, const char *filepath, HeightMap* heightmap) void write_output_file(std::vector<std::vector<Point>> all_points, const char *filepath, HeightMap* heightmap)
@ -221,13 +231,40 @@ void write_output_file(std::vector<std::vector<Point>> all_points, const char *f
std::vector<Point> points = all_points[j]; std::vector<Point> points = all_points[j];
bool left_to_right = true;
if ((points[0].y - points[1].y) < 0)
left_to_right = true;
else
left_to_right = false;
for (int k = 0; k < points.size(); k++) for (int k = 0; k < points.size(); k++)
{ {
bool left_to_right = true;
if ((points[k].x - points[k-1].x) < 0)
left_to_right = false;
bool top_to_bottom = true;
if ((points[k].y - points[k-1].y) < 0)
left_to_right = false;
int x_raw = points[k].x; int x_raw = points[k].x;
int y_raw = points[k].y; int y_raw = points[k].y;
auto [x, y] = local_to_projected(heightmap->geotransform, x_raw, y_raw); auto [x, y] = local_to_projected(heightmap->geotransform, x_raw, y_raw);
//auto [x_bl, y_bl, x_tr, y_tr] = marching_squares_lookup(*(cellmap->cells + i) );
geometry->setPoint(geometry->getNumPoints(),x ,y ); auto [x1, y1, x2, y2] = marching_squares_lookup(points[k].mscase);
if (left_to_right or !top_to_bottom)
{
geometry->setPoint(geometry->getNumPoints(),x + (x1/6) ,y + (y1/6));
geometry->setPoint(geometry->getNumPoints(),x + (x2/6) ,y + (y2/6));
}
else {
geometry->setPoint(geometry->getNumPoints(),x + (x2/6) ,y + (y2/6));
geometry->setPoint(geometry->getNumPoints(),x + (x1/6) ,y + (y1/6));
}
} }
if ( feature->SetGeometry(geometry) != OGRERR_NONE) if ( feature->SetGeometry(geometry) != OGRERR_NONE)