/* Dackral Phillips
   CSE 540 Lab #1 

This program draws several Open GL primitives to the screen in a variety of colors
In particular, a field of grass is composed of 1 QUAD primitive
4 Mountains are composed of 1 TRIANGLE primitive apiece
And a log cabin is composed of 3 QUAD primitives, a TRIANGLE PRIMITIVE and 6 LINE primitives*/

#include <glut.h>
#include <GL/gl.h>
#include <GL/glu.h>

void init() 
{
     glClearColor(0.8f, 0.8f, 1.0f, 1.0f);
     glShadeModel(GL_SMOOTH);
}

void reshape(GLsizei w, GLsizei h) 
{
     glViewport(0,0,w,h);
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     glOrtho(0.0, 250.0,0.0, 250.0,-1.0, 1.0);
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
}

void display()
{
     glClear (GL_COLOR_BUFFER_BIT);

     /* Draw a box of grass */

     glBegin(GL_QUADS);
     glColor3f(0.0, 1.0, 0.0);
     glVertex2f(250.0, 0.0);
     glColor3f(0.0, 0.9, 0.0);
     glVertex2f(250.0, 50.0);
     glColor3f(0.0, 0.8, 0.0);
     glVertex2f(0.0, 50.0);
     glColor3f(0.0, 0.7, 0.0);
     glVertex2f(0.0, 0.0);
     glEnd();

     /* An attempt at a few snow covered mountains */

     glBegin(GL_TRIANGLES);
     glColor3f(0.0, 0.0, 0.6);
     glVertex2f(250.0, 50.0);
     glColor3f(1.0, 1.0, 1.0);
     glVertex2f(200.0, 150.0);
     glColor3f(0.0, 0.0, 0.5);
     glVertex2f(150.0, 50.0);

     glBegin(GL_TRIANGLES);
     glColor3f(0.0, 0.0, 0.5);
     glVertex2f(200.0, 50.0);
     glColor3f(1.0, 1.0, 1.0);
     glVertex2f(150.0, 150.0);
     glColor3f(0.0, 0.0, 0.5);
     glVertex2f(100.0, 50.0);

     glColor3f(0.0, 0.0, 0.7);
     glVertex2f(150.0, 50.0);
     glColor3f(1.0, 1.0, 1.0);
     glVertex2f(100.0, 150.0);
     glColor3f(0.0, 0.0, 0.5);
     glVertex2f(50.0, 50.0);

     glColor3f(0.0, 0.0, 0.5);
     glVertex2f(100.0, 50.0);
     glColor3f(1.0, 1.0, 1.0);
     glVertex2f(50.0, 150.0);
     glColor3f(0.0, 0.0, 0.5);
     glVertex2f(0.0, 50.0);

     glEnd();

     /* A make shift log cabin */
     
     glBegin(GL_QUADS);
     glColor3f(0.4, 0.4, 0.0);
     glVertex2f(175.0, 15.0);
     glVertex2f(175.0, 65.0);
     glVertex2f(75.0, 65.0);
     glVertex2f(75.0, 15.0);

     glColor3f(0.2, 0.2, 0.0);
     glVertex2f(135.0, 15.0);
     glVertex2f(135.0, 45.0);
     glVertex2f(115.0, 45.0);
     glVertex2f(115.0, 15.0);

     glVertex2f(165.0, 65.0);
     glVertex2f(165.0, 105.0);
     glVertex2f(155.0, 105.0);
     glVertex2f(155.0, 65.0);
     glEnd();

     glBegin(GL_TRIANGLES);
     glColor3f(0.2, 0.2, 0.0);
     glVertex2f(190.0, 65.0);
     glVertex2f(125.0, 105.0);
     glVertex2f(60.0, 65.0);
     glEnd();

     glBegin(GL_LINES);
     glColor3f(0.0, 0.0, 0.0);

     glVertex2f(174, 25);
     glVertex2f(135, 25);

     glVertex2f(174, 35);
     glVertex2f(135, 35);

     glVertex2f(174, 45);
     glVertex2f(75, 45);

     glVertex2f(174, 55);
     glVertex2f(75, 55);

     glVertex2f(114, 35);
     glVertex2f(75, 35);

     glVertex2f(114, 25);
     glVertex2f(75, 25);

     glEnd();

     glutSwapBuffers();
     glFlush();
}

void keyboard(unsigned char key, int x, int y)
{
     switch(key)
     {
          case 27:
                  exit(0);
                  break;
     }
}

void main(int argc, char** argv) 
{
     glutInit(&argc, argv);
     glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);
     glutInitWindowPosition(50,50);
     glutInitWindowSize(500,500);
     glutCreateWindow("CSE 540 Lab #1");
     init();
     glutDisplayFunc(display);
     glutReshapeFunc(reshape);
     glutKeyboardFunc(keyboard);
     glutMainLoop();
}