// Demo for ECE660, 9/21/98, F.S.Hill,Jr.
// bare bones Canvas class..
/*  rotating rosette of numSides sides. Increase/decrease numSides with 'n"/'N',
and increase/decrease rotation speed with 'r'/'R' */
//#include <windows.h>
#include<stdio.h>
#include <iostream.h>
#include <math.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
typedef struct { float x, y;} tRealPoint;
//<<<<<<<<<<<<<<<<<<<<<<<<<<< Canvas class definition >>>>>>>>>>>
class Canvas {
  private:
	tRealPoint CP; 	// current position in world
  public:
	Canvas(){CP.x = CP.y = 0.0;};// constructor 
	void lineTo(float x, float y);
	void moveTo(float x, float y){	CP.x = x; CP.y = y;}
};
//######################## GLOBALS #################################
int screenWidth = 480, screenHeight = 480;
Canvas cvs; // create a global instance
int numSides = 11;
float angle = 0.0, delAngle = 0;
FILE *fp;
float f1,f2,f3,f4;
int T1=0,T11=0,T2=0,T22=0,T3=480,T33=480,T4=480,T44=480;
float x1,y11,x2,y2;
int done,disp;
float m;
int code1[4],code2[4];
//<<<<<<<<<<<<<<<<<<<<<<< lineTo >>>>>>>>>>>>>>>>>>>>>>>
void Canvas:: lineTo(float x, float y)
{
	glBegin(GL_LINES);
		glVertex2f((GLfloat)CP.x, (GLfloat)CP.y);
		CP.x = x; CP.y = y;
		glVertex2f((GLfloat)CP.x, (GLfloat)CP.y);
	glEnd();
	glFlush();
}
//<<<<<<<<<<<<<<<<to accept the file name>>>>>>>>>>>>>>>
   void filename()
 {
      char s[20];
      cout<<"ENTER THE FILE NAME"<<endl;
      scanf("%s",&s);
       fp=fopen(s,"r");
 }
//<<<<<<<<<<<<<<clipping>>>>>>>>>>>>>>>>>>>>>>>>  
//<<<<<<<<<<<<<<to select region code >>>>>>>>>>
void encode(int x,int y,int code[])
{ if(x<T1) code[0]=1;
  else code[0]=0;
  if(x>T3) code[1]=1;
  else code[1]=0;
  if(y<T2) code[2]=1;
  else code[2]=0;
  if(y>T4) code[3]=1;
  else code[3]=0;
}
//<<<<<<<<<<<<<< to varify the validity of the point >>>>>>>>>
int accept(int c1[],int c2[])
{ int i=1;
  for(int j=0;j<4;j++)
  { if(c1[j]==1 || c2[j]==1) i=0;}
  return i;
}

int reject(int c1[],int c2[])
{ int i=0;
  for(int j=0;j<4;j++)
  { if(c1[j]==1 && c2[j]==1) i=1;}
  return i;
}
//<<<<<<<<<<<<<<<swap the point>>>>>>>>>>>>>>>>>
//notion--(x1,y1) is the point outside the clip window.
void swap(float &x1,float &y1,float &x2,float &y2,int c1[],int c2[])
{ float x,y;int c[4];
  if(c1[0]==0 || c1[1]==0 || c1[2]==0 || c1[3]==0)
  { x=x1;y=y1;c[0]=c1[0];c[1]=c1[1];c[2]=c1[2];c[3]=c1[3];
    x1=x2;y1=y2;c1[0]=c2[0];c1[1]=c2[1];c1[2]=c2[2];c1[3]=c2[3];
    x2=x;y2=y;c2[0]=c[0];c2[1]=c[1];c2[2]=c[2];c2[3]=c[3];
  }
}
//<<<<<<<<<<<<<<<<main clipping program>>>>>>>>>>>>
void clip(float *x1,float *y11,float *x2,float *y2)
{ done=0;disp=0;      
  while(done==0)
  { encode((int)*x1,(int)*y11,code1);
    encode((int)*x2,(int)*y2,code2);
    if(accept(code1,code2)==1)
    {  done=1;disp=1;}
    else if(reject(code1,code2)==1)
       done=1;
    else 
    {  swap(*x1,*y11,*x2,*y2,code1,code2);
       m=(*y2-*y11)/(*x2-*x1);
       if(code1[0]==1)
       { *y11=(int) (*y11+(T1-*x1)*m);*x1=(int)T1;}
       else if(code1[1]==1)
       { *y11=(int)(*y11+(T3-*x1)*m);*x1=(int)T3;}
       else if(code1[2]==1)
       { *x1=(int)(*x1+(T2-*y11)/m);*y11=(int)T2;}
       else if(code1[3]==1)
       { *x1=(int)(*x1+(T4-*y11)/m);*y11=(int)T4;}
    }
  }
}

//<<<<<<<<<<<<<<<<<<<<<<<<<<<<< display >>>>>>>>>>>>>>>>>>>>>>
void display(void)
{
	glClear(GL_COLOR_BUFFER_BIT);		// clear screen 
	glMatrixMode(GL_MODELVIEW); // set up rotation
	glLoadIdentity();
        char ch;
        int n1,n;
        rewind(fp);
	while((ch=fgetc(fp))!='*');
        while((ch=fgetc(fp))=='*');
	cvs.moveTo(T11,T22);
	cvs.lineTo(T33,T22);
	cvs.lineTo(T33,T44);
	cvs.lineTo(T11,T44);
	cvs.lineTo(T11,T22);
        if(T11>T33){T1=T33;T3=T11;}
        if(T22>T44){T2=T44;T4=T22;}
	fscanf(fp,"%f%f%f%f",&f1,&f2,&f3,&f4);
        fscanf(fp,"%d",&n);
         for( int j=0;j<n;j++)
          { 
            fscanf(fp,"%d",&n1);
            fscanf(fp,"%f%f",&x1,&y11);
            x1*=480;y11*=480;
            for(int i=0;i<n1-1;i++)
             { 
               fscanf(fp,"%f%f",&x2,&y2);
	       x2*=480;y2*=480;
	       clip(&x1,&y11,&x2,&y2);
               if(disp==1){
	       cvs.moveTo(x1,y11);
	       cvs.lineTo(x2,y2);
	       disp=0;}
               x1=x2;y11=y2;
              }
           }
	glutSwapBuffers();//swap buffers for smooth animation
}

//<<<<<<<<<<<<<<<<<<<<< spinner >>>>>>>>>>>>>>>>>>
void spinner(void) // the idle function
{
   display();
}                 

//<<<<<<<<<<<<<<<<<<<<< myInit >>>>>>>>>>>>>>>>>>
void myInit()
{
	glClearColor(1.0f,1.0f,1.0f,1.0f);  // background is white 
	glColor3f(0.0f,0.0f,0.0f);			// set color of stuff 
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(0,480,0,480); // set window
	glViewport(0,0,480,480); //the default
}
//<<<<<<<<<<<<<<<<<<<<< myInit1 >>>>>>>>>>>>>>>>>>
void myInit1()
{
	glClearColor(1.0f,1.0f,1.0f,1.0f);  // background is white 
	glColor3f(0.0f,0.0f,0.0f);			// set color of stuff 
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(0,480,0,480); // set window
	glViewport(0,0,(int)(f3-f1)*480,(int)(f4-f2)*480); //the default
}
//<<<<<<<<<<<<<<<<<<<<<<mouse function>>>>>>>>>>>>>>>>>>>>>>>>
 void mouse(int button , int state ,int x ,int y)
               {
                  cout<<x<<"\t"<<y<<endl;
		  if((state==0)&&(button==0))
		  { T1=T3=T11=T33=x;T2=T4=T22=T44=480-y;}	
                }
//<<<<<<<<<<<<<<<<<<<<<motion function>>>>>>>>>>>>>>>>>>>>>>>>>
 void motion(int x,int y)
                {
		   T3=T33=x;T4=T44=480-y;
                }                        
//<<<<<<<<<<<<<<<<<<<<<< main >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
void main(int argc, char **argv)
{

        filename();
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
	glutInitWindowSize(screenWidth, screenHeight);
	glutInitWindowPosition(50, 100);
	glutCreateWindow("here we go");
	glutDisplayFunc(display);
	glutMouseFunc(mouse);
	glutMotionFunc(motion);
        glutIdleFunc(spinner);  
	myInit();
        glutMainLoop();

}
//<<<<<<<<<<END OF THE PROGRAM >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.

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