/*
 * gettin_started.cpp
 *
 *  Created on: 03.11.2010
 *      Author: s_inchen
 */
#include <stdlib.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <vector>
#include "Vector2D.h"
#include <iostream>

using namespace std;
//Laufvariable i:
int i = 0;

//Fenstergroesse:
const int WIDTH = 500;
const int HEIGHT = 500;

//Farbwerte:
int paintColor = 0;
const int WHITEPAINT = 1;
const int BLACKPAINT = 2;

//Variablen fuer Mauskoordinaten in einem Vector2D speichern:
Vector2D mouseXY(0, 0);

//Koordinaten fuer Linienzuege: Vector von Vector2D-Punkten mit den jeweiligen Mauskoordinaten:
vector<Vector2D> mouseXYline;

//Iterator:
//vector<Vector2D>::iterator it;

//wird zum ersten mal gezeichnet?
bool paintfirsttime = true;
//wurde geklickt?

void mouse(int button, int state, int x, int y) {
    if (state == GLUT_DOWN) {
        //Punktkoordinaten setzen:
        mouseXY.setX(x);
        mouseXY.setY(HEIGHT - y);
        //Punktkoordinaten zu Vector hinzufuegen:
        mouseXYline.push_back(mouseXY);
        //TESTAUSGABE1
        cout << "OBEN: " << mouseXYline.size() << " I:" << i << endl;

        if (button == GLUT_LEFT_BUTTON) {
            paintColor = WHITEPAINT;
            //Linie zeichnen ueber std::Vector

        }
        if (button == GLUT_RIGHT_BUTTON) {
            paintColor = BLACKPAINT;
        }
    }
    glutPostRedisplay();
}

void drawLine(){

}

void display() {
    //Punktgroesse & Aliasing:
    glPointSize(3.0);
    glEnable( GL_POINT_SMOOTH);
    //glDisable(GL_POINT_SMOOTH);

    //beim ersten Zeichnen den Bildschirm loeschen:
    if (paintfirsttime) {
        glClear ( GL_COLOR_BUFFER_BIT);
        glClearColor(1.0, 0.0, 0.0, 0.0);
        paintfirsttime = false;
    } else {
        if (paintColor == WHITEPAINT) {
            glColor3f(1.0, 1.0, 1.0);
        }
        if (paintColor == BLACKPAINT) {
            glColor3f(0.0, 0.0, 0.0);
        }
        glLineWidth(2.0);


                //Anfangs- und Endpunkte der Linie
                //Zeichne die Linie hier:

                Vector2D begin;

                glBegin( GL_LINES);

                for (int n=1; n<(mouseXYline.size()); n++) {
                cout << "von (" << mouseXYline.at(n).x() << "," << mouseXYline.at(n).y() << ")" << endl;
                glVertex2i(mouseXYline.at(n-1).x(), mouseXYline.at(n-1).y());
                glVertex2i(mouseXYline.at(n).x(), mouseXYline.at(n).y());
                }
                glEnd();
                i++;
        //TESTAUSGABE 2
        cout << "UNTEN: " << mouseXYline.size() << " I:" << i << endl;
    }
    glFlush();
}

void init(void) {
    glOrtho(0.0, WIDTH, 0.0, HEIGHT, -1.0, 1.0);
}

int main(int argc, char** argv) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(WIDTH, HEIGHT);
    glutInitWindowPosition(100, 100);
    glutCreateWindow("Paint");
    init();
    glutMouseFunc(mouse);
    glutDisplayFunc(display);
    glutMainLoop();

    return 0;
}