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/*
Author's name: Leyond Lin
Author's Blog: http://yexin218.cublog.cn
Student's ID:04009853F-I011-0032
declaration: These codes just for study. If you want to use my codes
in your own program, please keep the information of author, thanks.
Data:2005-3-5
*/
#include "pointArray.h"
#include "stdlib.h"
#include <GL/glut.h>
#include <GL/glu.h>
#include <iostream>
using namespace std;
int operation=0; //operation of begin, delete,move ,refresh, quit
int selection; //selecton of GL_LINE_LOOP¡¡or GL_LINER_STRIP
GLint WinHeight=480,WinWidth=480;//set the value of the Windows
static GLintPointArray poly;//creat an instantiation of GLintPointArray
int current=-1; //the current number of the points
int deleteIndex,moveIndex; //the index of deleting and moving point
int NUM=0;
int F=0,flag[20]={0}; // an array stores the number of Starting points
void drawPolyLine(GLintPointArray p,int selection)
{
int v=0;//parameter of the number of the strating points
//using the array flag to store the index of the starting points
for(int i=0;i<=current;i++)
{
if(poly.pt[i].getFlag()==1)
flag[++v]=i;
}
//print the indexs
/*for(int i=0;i<20;i++)
cout<<"the index of the strating points"< cout<
//draw the integrated image with the beginning of the starting point
for(int k=0;k<NUM;k++){
glBegin(selection==5? GL_LINE_LOOP:GL_LINE_STRIP);
for(int m=flag[k];m<flag[k+1];m++)
glVertex2i(p.pt[m].getX(),p.pt[m].getY());
glEnd();
}
//draw the image of the rest part
glBegin(selection==5? GL_LINE_LOOP:GL_LINE_STRIP);
for(int n= flag[NUM];n<=current;n++)
glVertex2i(p.pt[n].getX(),p.pt[n].getY());
glEnd();
//glFlush();
}
void mykey(unsigned char key, int mouseX, int mouseY)
{
//GLint x= mouseX;
// GLint y = mouseY;
switch(key)
{
case 'b': // presents for creating a new polyLine
case 'B':
operation = 1;
cout<< "operation is Beginning"<<endl;
break;
case 'd': //presents for deleting the next point pointed to
case 'D':
operation = 2;
cout<< "operation is Deleting"<<endl;
break;
case 'm': //presents for moveing the point
case 'M':
operation = 3;
cout<< "operation is Moving"<<endl;
break;
case 'r'://refresh the screen and redraw the polylines
case 'R':
glClear(GL_COLOR_BUFFER_BIT);
current=-1;
operation=0;
F=0;
NUM=0;
cout<< "operation is erasing "<<endl;
glFlush();
break;
case 'l': //do the action of GL_LINE_LOOP
case 'L':
selection = 5;
cout<<"selecton is LOOP"<<endl;
break;
case 's'://do the actions of GL_LINE_STRIP
case 'S':
selection = 6;
cout<<"selecton is STRIP"<<endl;
break;
case 'f'://presents for a new staring point
case 'F':
F=1;
NUM++;
cout<<"NUM is"<<NUM<<endl;
break;
case 'g'://reset the value of NUM to 0
case 'G':
F=0;
cout<<"NUM is"<<NUM<<endl;
break;
case 'q'://quit the programming
case 'Q':
exit(-1);
default:
break;
}
//glFlush();
}
void mymouse(int button,int state,int mouseX,int mouseY)
{
//to creat a new polyline
if(button == GLUT_LEFT_BUTTON && state ==GLUT_DOWN && current< 60 && operation == 1)
{
if(current == 59 || NUM == 19){
cout<<"YOU COULD NOT ADD MORE POINTS!!!"<<endl;
exit(-1);
}
poly.pt[++current].setX(mouseX);
poly.pt[current].setY(WinHeight-mouseY);
poly.pt[current].setFlag(F);
cout<<"point begin ("<<poly.pt[current].getX()<<","<<
poly.pt[current].getY()<<" ) with the flag of "<<poly.pt[current].getFlag()<<endl;
glClear(GL_COLOR_BUFFER_BIT);
drawPolyLine(poly,selection);
}
//to delete the point
if(button==GLUT_LEFT_BUTTON && state ==GLUT_DOWN && operation==2)
{
poly.CP.setX(mouseX);
poly.CP.setY(WinHeight-mouseY);
//cout<<"point to be deleted is:"<
for(int i= 0;i<=current;i++)
{ int subX = poly.pt[i].getX() - poly.CP.getX();
int subY = poly.pt[i].getY() - poly.CP.getY();
if((subX < 8 && subX > -8)&&(subY < 8 && subY > -8))
{
deleteIndex =i;
break;
}
}
cout<<"point ("<<poly.pt[deleteIndex].getX()<<","<<poly.pt[deleteIndex].getY()<<") be deleted"<<endl;
//set the next point's attribute if current's flag =1
if(poly.pt[deleteIndex].getFlag()==1)
poly.pt[deleteIndex+1].setFlag(1);
//refresh the array
for(int k=deleteIndex; k<=current;k++)
{ poly.pt[k].setX(poly.pt[k+1].getX());
poly.pt[k].setY(poly.pt[k+1].getY());
poly.pt[k].setFlag(poly.pt[k+1].getFlag());
}
current--;
glClear(GL_COLOR_BUFFER_BIT);
drawPolyLine(poly,selection);
}
//to move the point
if(button==GLUT_LEFT_BUTTON && state ==GLUT_DOWN && operation==3)
{
poly.CP.setX(mouseX);
poly.CP.setY(WinHeight-mouseY);
//cout<<"current to moving is"<
for(int i= 0;i<=current;i++)
{ int subX =poly.pt[i].getX()-poly.CP.getX();
int subY = poly.pt[i].getY() - poly.CP.getY();
if((subX< 8 && subX> -8)&&(subY < 8 &&subY > -8))
{
moveIndex =i;
break;
}
}
// to move a new one when click again
if(button==GLUT_LEFT_BUTTON && state==GLUT_DOWN && operation==3)
{
poly.CP.setX(mouseX);
poly.CP.setY(WinHeight-mouseY);
poly.pt[moveIndex].setX(poly.CP.getX());
poly.pt[moveIndex].setY(poly.CP.getY());
//poly.pt[moveIndex].setFlag();
cout<<"destinaton to moving is ("<<poly.CP.getX()<<","<<poly.CP.getY()<<")"<<endl;
/*show a new polylines
for(int i=0;i<=current;i++)
{
cout< }*/
}
glClear(GL_COLOR_BUFFER_BIT);
drawPolyLine(poly,selection);
}
glFlush();
}
void reshape(GLsizei w, GLsizei h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, w , 0, h);
glMatrixMode(GL_PROJECTION);
//drawPolyLine(poly,selection);
glFlush();
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0, 1.0, 0.0);
drawPolyLine(poly,selection);
glFlush();
}
void init(void)
{
glClearColor(0.0, 0.0, 1.0, 1.0);
glColor3f(0.0f,0.0f,0.0f);
glPointSize(2.0);
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(480,480);
glutInitWindowPosition(0, 0);
glutCreateWindow("Drawing a House,0409853F-I011-0032");
glutReshapeFunc(reshape);
glutDisplayFunc(display);
glutKeyboardFunc(mykey);
glutMouseFunc(mymouse);
init();
glutMainLoop();
return 0;
}
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