I have designed a analog clock. How to run this clock using system time.

**waqar ahmad** · 06-24-2013, 01:34 PM

How to implement timing function in it:

Code :

#include<iostream>
#include<windows.h>
#include<gl/GLU.h>
#include<gl/GL.h>
#include<glut.h>
#include<math.h>
#define PI 3.141592653589793
 
GLfloat secAngle=0.0;
GLfloat minAngle=0.0;
GLfloat hourAngle=0.0;
GLfloat hour=0.0;
GLfloat x1=0.0;
GLfloat y2=0.0;
GLfloat z1=0.0;
GLfloat radius = 10.0;
GLfloat smallradius = 3.0;
int angle;
 
void smallLines(GLfloat,GLfloat,GLfloat,GLfloat,GLfloat,int);
void secondsLine(void);
void minutesLines(void);
void hourLine(void);
void centerpoint(void);
void cirlce(void);
 
void myInit(void)
{
	glColor3f(1.0f,0.0f,0.0f);
	glMatrixMode(GL_PROJECTION);
	gluOrtho2D(0.0, 640.0, 0.0, 480.0);
}
 
void DrawClock()
{
	char buff[100];
	glLoadIdentity();
	glClearColor(1.0, 1.0, 1.0, 1.0);
	glOrtho(0.0, 20.0, 0.0, 20.0, -10.0, 10.0);
	glClear(GL_COLOR_BUFFER_BIT);
}
 
	// -------------------------------   Circle  -------------------------------------------
 
void cirlce()
	{
	glClearColor(1.0, 1.0, 1.0, 1.0);
 
	glPushMatrix();
	glTranslatef(10.0, 10.0, 10.0);
	glColor3f(0.9,0.9,0.9);
	glBegin(GL_TRIANGLE_FAN);
	glVertex3f(x1, y2, z1);
	for(angle=0; angle <= 360; angle +=1)
		glVertex3f(x1 + cos(angle * PI/180.0f)* radius, y2 + sin(angle * PI/180.0f) * radius, z1);
	glEnd();
	glPopMatrix();
}
 
	// -------------------------------   Small Lines  ---------------------------------------	
 
void smallLines(GLfloat x1,GLfloat y2,GLfloat z1,GLfloat radius,GLfloat smallradiu,int angle)
{
	glPushMatrix();
	glTranslatef(10.0, 10.0, 0.0);
	glColor3f(0.2,0.2,0.2);
	glLineWidth(2);
	for(angle=0; angle <= 360; angle +=30)
	{
	glBegin(GL_LINES);
		if(angle == 0.0 || angle==90.0 || angle == 180.0 || angle == 270.0 || angle == 360.0 )
		{
		glColor3f(1.0,0.2,0.2);
		glVertex3f(x1 + cos(angle * PI/180.0f)* (radius-1.2), y2 + sin(angle * PI/180.0f) * (radius-1.2), z1+0.1);
		glVertex3f(x1 + cos(angle * PI/180.0f)* radius, y2 + sin(angle * PI/180.0f) * radius, z1+0.1);
		}
		else
		{
		glColor3f(0.2,0.2,0.2);
		glVertex3f(x1 + cos(angle * PI/180.0f)* (radius-0.5), y2 + sin(angle * PI/180.0f) * (radius-0.5), z1);
		glVertex3f(x1 + cos(angle * PI/180.0f)* radius, y2 + sin(angle * PI/180.0f) * radius, z1);
		}
	glEnd();
	}
	glPopMatrix();
}
 
	// -------------------------------   Center Point  ---------------------------------------
 
void centerpoint()
{
	glColor3f(0.0,0.0,0.0);
	glPointSize(8.0);
 
	glPushMatrix();
	glTranslatef(10.0, 10.0, 0.0);
	glBegin(GL_POINTS);
	glVertex3f(0.0,0.0,0.0);
	glEnd();
	glPopMatrix();
	//glFlush();
 
}
 
	// -------------------------------   Seconds Line  ---------------------------------------
 
void secondsLine()
{
	glColor3f(1.0,1.0,0.0);
	glLineWidth(2.0);
	glPushMatrix();
	glTranslatef(10.0, 10.0, 0.0);
	glRotatef(-secAngle,0.0,0.0,1.0);
	glBegin(GL_LINES);
	glVertex2f(0,0);
	glVertex2f(7,7);
	glEnd();
	glPopMatrix();
}
 
	// -------------------------------   Minutes Line  ---------------------------------------
 
void minutesLines()
{
	glColor3f(1.0,0.0,0.0);
	glLineWidth(2.0);
	glPushMatrix();
 
	glTranslatef(10.0, 10.0, 0.0);
	glRotatef(-minAngle, 0.0, 0.0, 1.0);
	glBegin(GL_LINES);
	glVertex3f(0.0, 0.0, 1.0);
	glVertex3f(0.0, 7.0, 1.0);
	glEnd();
	glPopMatrix();
}
 
	// -------------------------------   Hour Line  ------------------------------------------
 
void hourLine()
{
	glColor3f(0.0,1.0,0.0);
	glLineWidth(3.0);
	glPushMatrix();
 
	glTranslatef(10.0, 10.0, 0.0);
	glRotatef(-hourAngle, 0.0, 0.0, 1.0);
 
	glBegin(GL_LINES);
	glVertex3f(0.0, 0.0, 0.0);
	glVertex3f(0.0, 6.5, 0.0);
	glEnd();
	glPopMatrix();
}
 
	// -------------------------------   Idel Function  ---------------------------------------
 
void Idle(void)
{
	secAngle += 0.1;
	hourAngle += 0.01;
	minAngle += 0.2;
 
	cirlce();
	smallLines(x1,y2,z1,radius,smallradius,angle);
	centerpoint();
	secondsLine();
	minutesLines();
	hourLine();
	glFlush();
}
 
void main(int argc , char **argv)
{
	glutInit(&argc , argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutInitWindowSize(600,600);
	glutInitWindowPosition(200,300);
	glutCreateWindow("Analog Clock");
 
	glutDisplayFunc(DrawClock);
	glutIdleFunc(Idle);
	myInit();
	glutMainLoop();
}

**GClements** · 06-24-2013, 02:43 PM

Originally Posted by waqar ahmad

How to implement timing function in it

Use glutTimerFunc() to register a timer callback. Have the timer callback call glutPostRedisplay(). Have the display callback read the current time using e.g. time() and localtime() and use the results to position the hands.

**waqar ahmad** · 06-25-2013, 01:49 PM

if i will not use ( _CRT_SECURE_NO_WARNINGS) it gives error

Code :

 
#ifdef _MSC_VER
#define _CRT_SECURE_NO_WARNINGS
#endif
 
#include<iostream>
#include<windows.h>
#include<gl/GLU.h>
#include<gl/GL.h>
#include<glut.h>
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include<time.h>
#define PI 3.141592653589793
 
GLfloat secAngle=0.0;
GLfloat minAngle=0.0;
GLfloat hourAngle=0.0;
GLfloat hour=0.0;
GLfloat x1=0.0;
GLfloat y2=0.0;
GLfloat z1=0.0;
GLfloat radius = 10.0;
GLfloat smallradius = 3.0;
//int angle;
 
GLfloat rx, ry, rz, angle;
 
struct tm *newtime;
time_t ltime;
 
void smallLines(GLfloat,GLfloat,GLfloat,GLfloat,GLfloat,int);
void secondsLine(void);
void minutesLines(void);
void hourLine(void);
void centerpoint(void);
void cirlce(void);
 
static void TimeEvent(int te)
{
    //int timent;
    //int i;
 
    rx = 30 * cos( angle );
    ry = 30 * sin( angle );
    rz = 30 * cos( angle );
    angle += 0.01;
    //if (angle > M_TWOPI) angle = 0;
 
    glutPostRedisplay();
    glutTimerFunc( 100, TimeEvent, 1);
}
 
void myInit(void)
{
    glColor3f(1.0f,0.0f,0.0f);
    glMatrixMode(GL_PROJECTION);
    gluOrtho2D(0.0, 640.0, 0.0, 480.0);
}
 
void DrawClock()
{
    time(&ltime); // Get time
    newtime = localtime(&ltime); // Convert to local time
 
    char buff[100];
    glLoadIdentity();
    glClearColor(1.0, 1.0, 1.0, 1.0);
    glOrtho(0.0, 20.0, 0.0, 20.0, -10.0, 10.0);
    glClear(GL_COLOR_BUFFER_BIT);
}
 
    // -------------------------------   Circle  -------------------------------------------
 
void cirlce()
    {
    glClearColor(1.0, 1.0, 1.0, 1.0);
 
    glPushMatrix();
    glTranslatef(10.0, 10.0, 10.0);
    glColor3f(0.9,0.9,0.9);
    glBegin(GL_TRIANGLE_FAN);
    glVertex3f(x1, y2, z1);
    for(angle=0; angle <= 360; angle +=1)
        glVertex3f(x1 + cos(angle * PI/180.0f)* radius, y2 + sin(angle * PI/180.0f) * radius, z1);
    glEnd();
    glPopMatrix();
    //secondsLine();
}
 
    // -------------------------------   Small Lines  ---------------------------------------    
 
void smallLines(GLfloat x1,GLfloat y2,GLfloat z1,GLfloat radius,GLfloat smallradiu,int angle)
{
    glPushMatrix();
    glTranslatef(10.0, 10.0, 0.0);
    glColor3f(0.2,0.2,0.2);
    glLineWidth(2);
    for(angle=0; angle <= 360; angle +=30)
    {
    glBegin(GL_LINES);
        if(angle == 0.0 || angle==90.0 || angle == 180.0 || angle == 270.0 || angle == 360.0 )
        {
        glColor3f(1.0,0.2,0.2);
        glVertex3f(x1 + cos(angle * PI/180.0f)* (radius-1.2), y2 + sin(angle * PI/180.0f) * (radius-1.2), z1+0.1);
        glVertex3f(x1 + cos(angle * PI/180.0f)* radius, y2 + sin(angle * PI/180.0f) * radius, z1+0.1);
        }
        else
        {
        glColor3f(0.2,0.2,0.2);
        glVertex3f(x1 + cos(angle * PI/180.0f)* (radius-0.5), y2 + sin(angle * PI/180.0f) * (radius-0.5), z1);
        glVertex3f(x1 + cos(angle * PI/180.0f)* radius, y2 + sin(angle * PI/180.0f) * radius, z1);
        }
    glEnd();
    }
    glPopMatrix();
}
 
    // -------------------------------   Center Point  ---------------------------------------
 
void centerpoint()
{
    glColor3f(0.0,0.0,0.0);
    glPointSize(8.0);
 
    glPushMatrix();
    glTranslatef(10.0, 10.0, 0.0);
    glBegin(GL_POINTS);
    glVertex3f(0.0,0.0,0.0);
    glEnd();
    glPopMatrix();
    //glFlush();
 
}
 
    // -------------------------------   Seconds Line  ---------------------------------------
 
void secondsLine()
{
     int sec_ticks;
    secAngle += 0.1;
    glColor3f(1.0,1.0,0.0);
    glLineWidth(2.0);
    glPushMatrix();
    glTranslatef(10.0, 10.0, 0.0);
    glRotatef((360/60) * newtime->tm_sec,0.0,0.0,1.0);
    glBegin(GL_LINES);
    glVertex2f(0,0);
    glVertex2f(7,7);
    glEnd();
 
    for(sec_ticks = 0; sec_ticks < 60; sec_ticks++)
     {
       glPushMatrix();
    glTranslatef(0.0, 0.0, 0.0);
    glRotatef( (360/60) * sec_ticks, 0.0, 0.0, 1.0);
    glTranslatef(6.0, 0.0, 0.0);
    glutSolidCube(0.25);
    glPopMatrix();
    }
 
    glPopMatrix();
    glutPostRedisplay();
    //glutTimerFunc(10000,secondsLine,0);
 
}
    // -------------------------------   Minutes Line  ---------------------------------------
 
void minutesLines()
{
    glColor3f(1.0,0.0,0.0);
    glLineWidth(2.0);
    glPushMatrix();
 
    glTranslatef(10.0, 10.0, 0.0);
    glRotatef((360/60) * newtime->tm_min, 0.0, 0.0, 1.0);
    glBegin(GL_LINES);
    glVertex3f(0.0, 0.0, 1.0);
    glVertex3f(0.0, 7.0, 1.0);
    glEnd();
    glPopMatrix();
}
 
    // -------------------------------   Hour Line  ------------------------------------------
 
void hourLine()
{
     int hour_ticks;
 
    glColor3f(0.0,1.0,0.0);
    glLineWidth(3.0);
    glPushMatrix();
 
    glTranslatef(10.0, 10.0, 0.0);
    glRotatef((360/12) * newtime->tm_hour  + (360/60) * (60 / (newtime->tm_min+1)), 0.0, 0.0, 1.0);
 
    glBegin(GL_LINES);
    glVertex3f(0.0, 0.0, 0.0);
    glVertex3f(0.0, 6.5, 0.0);
    glEnd();
 
 
  for(hour_ticks = 0; hour_ticks < 12; hour_ticks++)
      {
      glPushMatrix();// Draw next arm axis.
      glColor3f(0.0, 1.0, 1.0); // give it a color
      glTranslatef(0.0, 0.0, 0.0);
      glRotatef( (360/12) * hour_ticks, 0.0, 0.0, 1.0);
      glTranslatef( 6.0, 0.0, 0.0);
      glutSolidCube(1.0);
 
      glPopMatrix();
  }
 
    glPopMatrix();
}
 
    // -------------------------------   Idel Function  ---------------------------------------
 
void Idle(void)
{
    //secAngle += 0.1;
    hourAngle += 0.01;
    minAngle += 0.2;
 
    cirlce();
    smallLines(x1,y2,z1,radius,smallradius,angle);
    centerpoint();
    secondsLine();
    minutesLines();
    hourLine();
    glFlush();
}
void main(int argc , char **argv)
{
    glutInit(&argc , argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(600,600);
    glutInitWindowPosition(200,300);
    glutCreateWindow("Analog Clock");
 
    glutDisplayFunc(DrawClock);
    glutIdleFunc(Idle);
    // glutTimerFunc( 10, TimeEvent, 1);
    myInit();
    glutMainLoop();
}

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I have designed a analog clock. How to run this clock using system time.

tm_sec <Unable to read memory> Error time function doesn't reading memory to get time

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