mirror of
https://github.com/jhasse/poly2tri.git
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251 lines
7.0 KiB
C++
251 lines
7.0 KiB
C++
/*
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* Poly2Tri Copyright (c) 2009-2010, Mason Green
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* http://code.google.com/p/poly2tri/
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Poly2Tri nor the names of its contributors may be
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* used to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <cstdlib>
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#include <GL/glfw.h>
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#include <time.h>
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#include <fstream>
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#include <string>
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#include <sstream>
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#include <algorithm>
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#include <iterator>
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#include <iostream>
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using namespace std;
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#include "../poly2tri/poly2tri.h"
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void Init();
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void ShutDown(int return_code);
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void MainLoop(const double zoom);
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void Draw(const double zoom);
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float rotate_y = 0,
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rotate_z = 0;
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const float rotations_per_tick = .2;
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list<Triangle*> triangles;
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double StringToDouble(const std::string& s) {
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std::istringstream i(s);
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double x;
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if (!(i >> x))
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return 0;
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return x;
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}
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int main(int argc, char* argv[]) {
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if (argc != 3) {
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cout << "Usage: p2t filename zoom" << endl;
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return 1;
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}
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/*
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// initialize random seed:
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srand ( time(NULL) );
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int a = 0;
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int b = 2000;
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for(int i = 0; i < num_points; i++) {
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double x = rand() % (b - a - 1) + a + 1;
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double y = rand() % (b - a - 1) + a + 1;
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polyline[i] = Point(x, y);
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}
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polyline[0] = Point(5, 5);
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polyline[1] = Point(-5, 5);
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polyline[2] = Point(-5, -5);
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polyline[3] = Point(5, -5);
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//Point foo[] = {Point(5, 5.1), Point(-5, 5.2), Point(-5, -5.3), Point(5, -5.4), Point(5.1, 5.5), Point(5, 5.5),
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// Point(-5, 5.6), Point(-5, -5.7), Point(5, -5.8), Point(5, 5.9), Point(-5, 5.1),
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// Point(-5, -5.11), Point(5, -5.12), Point(5, 5.13), Point(-5, 5.14), Point(-5, -5.15), Point(5, -5.16)};
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*/
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string line;
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ifstream myfile (argv[1]);
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vector<Point> points;
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if (myfile.is_open()) {
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while (!myfile.eof()) {
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getline (myfile,line);
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if(line.size() == 0) {
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break;
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}
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istringstream iss(line);
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vector<string> tokens;
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copy(istream_iterator<string>(iss), istream_iterator<string>(),
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back_inserter<vector<string> >(tokens));
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double x = StringToDouble(tokens[0]);
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double y = StringToDouble(tokens[1]);
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points.push_back(Point(x, y));
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}
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myfile.close();
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} else {
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cout << "File not opened" << endl;
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}
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int num_points = points.size();
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cout << "Number of points = " << num_points << endl;
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Point** polyline = new Point *[num_points];
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for(int i = 0; i < num_points; i++) {
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polyline[i] = &points[i];
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}
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Init();
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// Perform triangulation
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double init_time = glfwGetTime();
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CDT * cdt = new CDT(polyline, num_points);
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cdt->Triangulate();
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double dt = glfwGetTime() - init_time;
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cout << "Elapsed time (secs) = " << dt << endl;
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triangles = cdt->GetTriangles();
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MainLoop(atof(argv[2]));
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delete [] polyline;
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ShutDown(0);
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return 0;
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}
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void Init()
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{
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const int window_width = 800,
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window_height = 600;
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if (glfwInit() != GL_TRUE)
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ShutDown(1);
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// 800 x 600, 16 bit color, no depth, alpha or stencil buffers, windowed
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if (glfwOpenWindow(window_width, window_height, 5, 6, 5, 0, 0, 0, GLFW_WINDOW) != GL_TRUE)
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ShutDown(1);
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glfwSetWindowTitle("The GLFW Window");
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glClearColor(0.0, 0.0, 0.0, 0.0);
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glHint (GL_LINE_SMOOTH_HINT, GL_NICEST);
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}
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void ShutDown(int return_code)
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{
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glfwTerminate();
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exit(return_code);
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}
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void MainLoop(const double zoom)
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{
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// the time of the previous frame
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double old_time = glfwGetTime();
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// this just loops as long as the program runs
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bool running = true;
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while(running)
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{
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// calculate time elapsed, and the amount by which stuff rotates
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double current_time = glfwGetTime(),
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delta_rotate = (current_time - old_time) * rotations_per_tick * 360;
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old_time = current_time;
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// escape to quit, arrow keys to rotate view
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// Check if ESC key was pressed or window was closed
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running = !glfwGetKey( GLFW_KEY_ESC ) && glfwGetWindowParam( GLFW_OPENED );
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if (glfwGetKey(GLFW_KEY_LEFT) == GLFW_PRESS)
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rotate_y += delta_rotate;
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if (glfwGetKey(GLFW_KEY_RIGHT) == GLFW_PRESS)
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rotate_y -= delta_rotate;
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// z axis always rotates
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rotate_z += delta_rotate;
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// Draw the scene
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Draw(zoom);
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// swap back and front buffers
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glfwSwapBuffers();
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}
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}
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void ResetZoom(double zoom, double cx, double cy, double width, double height) {
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double left = -width / zoom;
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double right = width / zoom;
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double bottom = -height / zoom;
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double top = height / zoom;
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// Reset viewport
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glLoadIdentity();
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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// Reset ortho view
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glOrtho(left, right, bottom, top, 1, -1);
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glTranslatef(-cx, -cy, 0);
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glMatrixMode(GL_MODELVIEW);
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glDisable(GL_DEPTH_TEST);
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glLoadIdentity();
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// Clear the screen
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glClear(GL_COLOR_BUFFER_BIT);
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}
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void Draw(const double zoom)
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{
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// reset zoom
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Point center = Point(0, 0);
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ResetZoom(zoom, center.x, center.y, 800, 600);
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list<Triangle*>::iterator it;
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for (it = triangles.begin(); it != triangles.end(); it++) {
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Triangle* t = *it;
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Point* a = t->GetPoint(0);
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Point* b = t->GetPoint(1);
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Point* c = t->GetPoint(2);
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// Red
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glColor3f(1, 0, 0);
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glBegin(GL_LINE_LOOP); // Drawing Using Triangles
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glVertex2f(a->x, a->y); // Top
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glVertex2f(b->x, b->y); // Bottom Left
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glVertex2f(c->x, c->y); // Bottom Right
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glEnd();
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}
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}
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