SRS #2/15var (IV semester) CG

#include "stdafx.h"
#include "glut.h"
#include <cmath>
#include <iostream>
#include <string>
#include <ctime>

using namespace std;

# define M_PI           3.14159265358979323846  /* pi */
GLint Width = 800, Height = 800;

void Paint(double &x, double &y, double l, double u, int t, int q);
void GospersCurve(double x, double y, double l, double u, int t, int q)
{
    // начало построения ломанных
    if (t > 0)
    {
        if (q == 1)
        {
            //формулы построения
            x += l * cos(u);
            y -= l * sin(u);
            u += M_PI;
        }
        u -= 2.0 * M_PI / 19.0;//соединение линий
        l /= sqrt(7); //масштаб
                      //функции рисования
        Paint(x, y, l, u, t - 1.0, 0);
        Paint(x, y, l, u + M_PI / 3.0, t - 1.0, 1.0);
        Paint(x, y, l, u + M_PI, t - 1.0, 1.0);
        Paint(x, y, l, u + 2.0 * M_PI / 3.0, t - 1.0, 0.0);
        Paint(x, y, l, u, t - 1.0, 0);
        Paint(x, y, l, u, t - 1.0, 0);
        Paint(x, y, l, u - M_PI / 3.0, t - 1.0, 1.0);
    }
    else {
        glBegin(GL_LINES);
        glColor3d(0.0, 1.0, 0.0);
        glLineWidth(2.0);
        glVertex2d(
            (double)round(x),
            (double)round(y)
        );
        glVertex2d(
            (double)round(x + cos(u) * l),
            (double)round(y - sin(u) * l)
        );
        glEnd();
        glFinish();
    }
}
void Paint(double &x, double &y, double l, double u, int t, int q)
{
    GospersCurve(x, y, l, u, t, q);
    x += l * cos(u);
    y -= l * sin(u);
}

void Draw()
{
    unsigned int start_time = clock();
    GospersCurve(-700, 600, 300.0, 9.755, 1, 0); //x, y, scale, rotate, depth, ?
    GospersCurve(-300, 600, 300.0, 10.08, 2, 0);
    GospersCurve(100, 600, 300.0, 10.41, 3, 0);
    GospersCurve(-700, 100, 300.0, 10.41, 4, 0);
    //GospersCurve(-300, 100, 300.0, 10.41, 5, 0);
    //GospersCurve(100, 100, 300.0, 10.41, 6, 0);
    unsigned int end_time = clock();
    std::string time_ = "Total milliseconds : " + to_string(end_time - start_time);

    char *text = new char[time_.length() + 1];
    strcpy(text, time_.c_str());
    glRasterPos2i(-980, 940);
    for (int i = 0; i < strlen(text); i++)
        glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, text[i]);
    glEnd();
    glFinish();
}
void Reshape(GLint w, GLint h)
{
    glClearColor(0.3, 0.3, 0.3, 1.0);
    glClear(GL_COLOR_BUFFER_BIT);
    Width = w;
    Height = h;
    glViewport(0, 0, w, h);
}
void main(int argc, char ** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB);
    glutInitWindowPosition(200, 200);
    glutInitWindowSize(Width, Height);
    glutCreateWindow("Gosper's Curve");

    glClearColor(0.3, 0.3, 0.3, 1.0);
    glClear(GL_COLOR_BUFFER_BIT);

    glutDisplayFunc(Draw);
    glutReshapeFunc(Reshape);
    glMatrixMode(GL_PROJECTION);

    glScaled(0.001f, 0.001f, 0.001f);

    glutMainLoop();
}