#include <GL/gl.h>
#include<stdio.h>
#include<math.h>
#include <GL/glut.h>

void init(void)
{
    glClearColor(0.0, 0.9, 0.9, 0.0);
    glMatrixMode(GL_PROJECTION);
    gluOrtho2D(0, 1000, 0, 900);
}

void circle(GLfloat rx, GLfloat ry, GLfloat cx, GLfloat cy)
{
    glBegin(GL_POLYGON);
    glVertex2f(cx, cy);
    for (int i = 0; i <= 360; i++)
    {
        float angle = i * 3.1416 / 180;
        float x = rx * cos(angle);
        float y = ry * sin(angle);
        glVertex2f((x + cx), (y + cy));
    }
    glEnd();
}

float shift = 0; // a variable used to move the boat right and left


float bx = 10;

void clouds()
{
    glPushMatrix();
    glTranslatef(bx, 0, 0);
    // 1st cloud
    glColor3ub(255, 255, 255);

    // first cloud
    circle(50, 50, 300, 700);
    circle(50, 50, 350, 700);
    circle(50, 50, 400, 700);
    circle(50, 50, 450, 700);

    circle(50, 50, 325, 725);
    circle(50, 50, 350, 725);
    circle(50, 50, 400, 725);
    circle(50, 50, 425, 725);

    circle(50, 50, 345, 750);
    circle(50, 50, 400, 750);
    circle(50, 50, 415, 750);

    // seond cloud
    circle(50, 50, 600, 720);
    circle(50, 50, 650, 720);
    circle(50, 50, 700, 720);
    circle(50, 50, 750, 720);

    circle(50, 50, 625, 745);
    circle(50, 50, 650, 745);
    circle(50, 50, 700, 745);
    circle(50, 50, 725, 745);

    circle(50, 50, 645, 770);
    circle(50, 50, 700, 770);
    circle(50, 50, 715, 770);

    // tree
    glColor3f(194.0/255.0, 114.0/255.0, 17.0/255.0);
    glBegin(GL_QUADS);
        glVertex2d(800, 300);
        glVertex2d(800, 600);
        glVertex2d(850, 600);
        glVertex2d(850, 300);
    glEnd();

    glColor3ub(0,128,0);

    circle(50, 50, 750, 600);
    circle(50, 50, 800, 600);
    circle(50, 50, 850, 600);
    circle(50, 50, 900, 600);

    circle(50, 50, 775, 625);
    circle(50, 50, 800, 625);
    circle(50, 50, 850, 625);
    circle(50, 50, 875, 625);

    circle(50, 50, 795, 650);
    circle(50, 50, 850, 650);
    circle(50, 50, 855, 650);
   /* glPopMatrix();
    bx += .05;
    if (bx > 0)
        bx = -500;
    glutPostRedisplay();*/

}

void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);

    // green field
    glColor3f(0,128,0);
    glBegin(GL_QUADS);
        glVertex2d(0, 0);
        glVertex2d(0, 300);
        glVertex2d(1000, 300);
        glVertex2d(1000, 0);
    glEnd();

    //sun design
    glColor3f(255, 215, 0);

    circle(50, 50, 100, 700);

    // clouds design
    clouds();


    glFlush();
    glutSwapBuffers();
}


int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(1000, 900);
    glutInitWindowPosition(100, 100);
    glutCreateWindow("A Moving Boat");
    init();
    glutDisplayFunc(display);
    glutMainLoop();
    return 0;
}