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Merge pull request #46 from pierre-dejoue/testbed-autozoom

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QoL: Add auto-zoom feature to the testbed app
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Jan Niklas Hasse 2022-05-06 07:56:47 +02:00 committed by GitHub
commit 54af704954
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2 changed files with 70 additions and 21 deletions
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9
README.md
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@ -74,14 +74,19 @@ Load data points from a file:
```
build/testbed/p2t <filename> <center_x> <center_y> <zoom>
```
Load data points from a file and automatically fit the geometry to the window:
```
build/testbed/p2t <filename>
```
Random distribution of points inside a constrained box:
```
build/testbed/p2t random <num_points> <box_radius> <zoom>
```
Examples:
```
build/testbed/p2t testbed/data/dude.dat 300 500 2
build/testbed/p2t testbed/data/nazca_monkey.dat 0 0 9
build/testbed/p2t testbed/data/dude.dat 350 500 3
build/testbed/p2t testbed/data/nazca_monkey.dat
build/testbed/p2t random 10 100 5.0
build/testbed/p2t random 1000 20000 0.025

76
testbed/main.cc
View File

@ -1,5 +1,5 @@
/*
* Poly2Tri Copyright (c) 2009-2018, Poly2Tri Contributors
* Poly2Tri Copyright (c) 2009-2022, Poly2Tri Contributors
* https://github.com/jhasse/poly2tri
*
* All rights reserved.
@ -40,10 +40,12 @@
#include <fstream>
#include <iostream>
#include <iterator>
#include <limits>
#include <list>
#include <numeric>
#include <sstream>
#include <string>
#include <utility>
#include <vector>
using namespace std;
@ -51,11 +53,12 @@ using namespace p2t;
bool ParseFile(string filename, vector<Point*>& out_polyline, vector<vector<Point*>>& out_holes,
vector<Point*>& out_steiner);
std::pair<Point, Point> BoundingBox(const std::vector<Point*>& polyline);
void GenerateRandomPointDistribution(size_t num_points, double min, double max,
vector<Point*>& out_polyline,
vector<vector<Point*>>& out_holes,
vector<Point*>& out_steiner);
void Init();
void Init(int window_width, int window_height);
void ShutDown(int return_code);
void MainLoop(const double zoom);
void Draw(const double zoom);
@ -69,6 +72,13 @@ double rotate_y = 0.0,
rotate_z = 0.0;
const double rotations_per_tick = 0.2;
/// Default window size
constexpr int default_window_width = 800;
constexpr int default_window_height = 600;
/// Autozoom border (percentage)
const double autozoom_border = 0.05;
/// Screen center x
double cx = 0.0;
/// Screen center y
@ -105,14 +115,21 @@ int main(int argc, char* argv[])
double max, min;
double zoom;
if (argc != 5) {
if (argc != 2 && argc != 5) {
cout << "-== USAGE ==-" << endl;
cout << "Load Data File: p2t filename center_x center_y zoom" << endl;
cout << "Example: ./build/p2t testbed/data/dude.dat 500 500 1" << endl;
cout << "Load Data File: p2t <filename> <center_x> <center_y> <zoom>" << endl;
cout << " Example: build/testbed/p2t testbed/data/dude.dat 350 500 3" << endl;
cout << "Load Data File with Auto-Zoom: p2t <filename>" << endl;
cout << " Example: build/testbed/p2t testbed/data/nazca_monkey.dat" << endl;
cout << "Generate Random Polygon: p2t random <num_points> <box_radius> <zoom>" << endl;
cout << " Example: build/testbed/p2t random 100 1 500" << endl;
return 1;
}
if (string(argv[1]) == "random") {
// If true, adjust the zoom settings to fit the input geometry to the window
const bool autozoom = (argc == 2);
if (!autozoom && string(argv[1]) == "random") {
num_points = atoi(argv[2]);
random_distribution = true;
char* pEnd;
@ -122,10 +139,12 @@ int main(int argc, char* argv[])
zoom = atof(argv[4]);
} else {
filename = string(argv[1]);
if (!autozoom) {
cx = atof(argv[2]);
cy = atof(argv[3]);
zoom = atof(argv[4]);
}
}
if (random_distribution) {
GenerateRandomPointDistribution(num_points, min, max, polyline, holes, steiner);
@ -136,7 +155,21 @@ int main(int argc, char* argv[])
}
}
Init();
if (autozoom) {
assert(0.0 <= autozoom_border && autozoom_border < 1.0);
const auto bbox = BoundingBox(polyline);
Point center = bbox.first + bbox.second;
center *= 0.5;
cx = center.x;
cy = center.y;
Point sides = bbox.second - bbox.first;
zoom = 2.0 * (1.0 - autozoom_border) * std::min((double)default_window_width / sides.x, (double)default_window_height / sides.y);
std::cout << "center_x = " << cx << std::endl;
std::cout << "center_y = " << cy << std::endl;
std::cout << "zoom = " << zoom << std::endl;
}
Init(default_window_width, default_window_height);
/*
* Perform triangulation!
@ -182,6 +215,7 @@ int main(int argc, char* argv[])
cout << "Total number of points = " << (polyline.size() + points_in_holes + steiner.size())
<< endl;
cout << "Number of triangles = " << triangles.size() << endl;
cout << "Is Delaunay = " << (IsDelaunay(triangles) ? "true" : "false") << endl;
cout << "Elapsed time (ms) = " << dt * 1000.0 << endl;
MainLoop(zoom);
@ -262,6 +296,21 @@ bool ParseFile(string filename, vector<Point*>& out_polyline, vector<vector<Poin
return true;
}
std::pair<Point, Point> BoundingBox(const std::vector<Point*>& polyline)
{
assert(polyline.size() > 0);
using Scalar = decltype(p2t::Point::x);
Point min(std::numeric_limits<Scalar>::max(), std::numeric_limits<Scalar>::max());
Point max(std::numeric_limits<Scalar>::min(), std::numeric_limits<Scalar>::min());
for (const Point* point : polyline) {
min.x = std::min(min.x, point->x);
min.y = std::min(min.y, point->y);
max.x = std::max(max.x, point->x);
max.y = std::max(max.y, point->y);
}
return std::make_pair(min, max);
}
void GenerateRandomPointDistribution(size_t num_points, double min, double max,
vector<Point*>& out_polyline,
vector<vector<Point*>>& out_holes, vector<Point*>& out_steiner)
@ -280,14 +329,11 @@ void GenerateRandomPointDistribution(size_t num_points, double min, double max,
}
}
void Init()
void Init(int window_width, int window_height)
{
const int window_width = 800,
window_height = 600;
if (glfwInit() != GL_TRUE)
ShutDown(1);
// 800 x 600, 16 bit color, no depth, alpha or stencil buffers, windowed
// width x height, 16 bit color, no depth, alpha or stencil buffers, windowed
window = glfwCreateWindow(window_width, window_height, "Poly2Tri - C++", NULL, NULL);
if (!window)
ShutDown(1);
@ -373,7 +419,7 @@ void Draw(const double zoom)
// reset zoom
Point center = Point(cx, cy);
ResetZoom(zoom, center.x, center.y, 800, 600);
ResetZoom(zoom, center.x, center.y, (double)default_window_width, (double)default_window_height);
for (int i = 0; i < triangles.size(); i++) {
Triangle& t = *triangles[i];
@ -414,7 +460,7 @@ void DrawMap(const double zoom)
// reset zoom
Point center = Point(cx, cy);
ResetZoom(zoom, center.x, center.y, 800, 600);
ResetZoom(zoom, center.x, center.y, (double)default_window_width, (double)default_window_height);
list<Triangle*>::iterator it;
for (it = map.begin(); it != map.end(); it++) {
@ -454,8 +500,6 @@ void ConstrainedColor(bool constrain)
}
}
double StringToDouble(const std::string& s)
{
std::istringstream i(s);