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7.4

draw line

Asked by valleytech in OpenGL Graphics & Game Programming

hi all,
I try to draw poly-line when user clicks on windows. however, i have this error

"GLUT: Warning in C:\OPENGL\Debug\Cpp1.exe: The following is a new check for GLUT
3.0; update your code.
GLUT: Fatal Error in C:\OPENGL\Debug\Cpp1.exe: redisplay needed for window 1, bu
t no display callback.
Press any key to continue"

please tell me what i did wrong. Thanks a lot.

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             #include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
 
#include <GL/glut.h>
 
 
  int ViewportXFirst  , ViewportYFirst ;
  int ViewportXSecond , ViewportYSecond;
 
  int flag =0; // count 2 clicks at a time.
               // flag = 0 : first time. flag =1 : second time
 
 
 
void init (void)
{
      glClearColor (1.0,1.0,1.0,0.0);
 
      glMatrixMode( GL_PROJECTION);
      gluOrtho2D(0.0,200.0,0.0,150.0);
}
 
void lineSegment (void)
{
      glClear (GL_COLOR_BUFFER_BIT);
 
      glColor3f(1.0,0.0,0.0);
      glBegin(GL_LINES);
            glVertex2i(ViewportXFirst,ViewportYFirst);
            glVertex2i(ViewportXSecond,ViewportYSecond);
      glEnd();
      
      glFlush();
}
 
void processMouse(int button, int state, int x, int y) {
 
      if (state == GLUT_DOWN)
      {      
            if(flag ==0)
            {
                  printf("flag is %d\n",flag);
                  ViewportXFirst = x;
                  ViewportYFirst = 512- y;
 
                  flag ++;
            }
            else
            {
				if(flag ==1)
				{
                  printf("flag is %d\n",flag);
 
                  ViewportXSecond = x;
                  ViewportYSecond = 512- y;
				}
				else
				{
					ViewportXFirst = ViewportXSecond;  // swap second point to first point 
					ViewportYFirst = ViewportYSecond;  //before obtain new point to second point
 
					ViewportXSecond = x;
					ViewportYSecond = 512- y;
 
				}
				flag++;
                  
            }
 
		
				printf("ViewportXFirst is %d   ",ViewportXFirst);
				printf("ViewportYFirst is %d",ViewportYFirst);
				printf("\n");
 
				printf("ViewportXSecond is %d   ",ViewportXSecond);
				printf("ViewportYSecond is %d",ViewportYSecond);
				printf("\n"); 
      }
	
	  if(flag >=2)
	  {
		glutDisplayFunc(lineSegment);
 
	  }
 
}
 
void main(int argc, char ** argv)
{
      glutInit(&argc, argv);
      glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
      glutInitWindowPosition(50,100);
      glutInitWindowSize(512,512);
      glutCreateWindow("An example openGL sample");
 
      init();
     
 
 
      //adding here the mouse processing callbacks
      glutMouseFunc(processMouse);
 
	  if( flag >=2)
	  {
	//	   glutDisplayFunc(lineSegment);
	  }
      
      //glutMotionFunc(processMouseActiveMotion);
      //glutPassiveMotionFunc(processMousePassiveMotion);
      //glutEntryFunc(processMouseEntry);
 
      glutMainLoop();
}

           
         

Keywords: draw line

	Title
1	render a mesh

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draw line

Asked by valleytech in OpenGL Graphics & Game Programming

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