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## Wednesday, 2 October 2013

### Analog clock in c - Simplified

C program implement analog clock

#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include <graphics.h>
#include <dos.h>

/*
* calculates the position for minute and second needle.
* 360 to 90 degree is equivalent to 45 to 0 th minute
* in clock.  So, store the points in reverse direction(45 to 0)
* Once 0 is reached, we need to store points corresponds to
* 84th degree to 0 degree in reverse direction(59 to 46). So,
* totally we will get 60 points which corresponds to 60
* minute or second position in clock.
*/
void minSecCalc(int xrad, int midx, int midy, int x, int y) {
int i, j = 45;
for (i = 360; i >= 0; i = i - 6) {
x[j] = midx - (xrad * cos((i * 3.14) / 180));
y[j--] = midy - (xrad * sin((i * 3.14) / 180));
j = (j == -1) ? 59:j;
}
return;

}

/*
* find the points at 0, 30, 60,.., 360 degrees
* on the given circle.  x value correponds to
* radius * cos(angle) and y value corresponds
* to radius * sin(angle).  Numbers in the clock
* are written using the above manipulated x and
* y values.  And the hour needle movement
* is based on this
*/

void calcPoints(int radius, int midx, int midy, int x, int y) {
int x1, y1;
/* 90, 270, 0, 180 degrees */
x = midx, y = midy - radius;
x = midx, y = midy + radius;
x = midx + radius, y = midy;
x = midx - radius, y = midy;

/* 30, 150, 210, 330 degrees */
x1 = (int) ((radius / 2) * sqrt(3));
y1 = (radius / 2);
x = midx + x1, y = midy - y1;
x = midx + x1, y = midy + y1;
x = midx - x1, y = midy + y1;
x = midx - x1, y = midy - y1;

/* 60, 120, 210, 300 degrees */
x1 = radius / 2;
y1 = (int) ((radius / 2)  * sqrt(3));
x = midx + x1, y = midy - y1;
x = midx + x1, y = midy + y1;
x = midx - x1, y = midy + y1;
x = midx - x1, y = midy - y1;
return;
}

int main() {
/* request auto detection */
int gdriver = DETECT, gmode, err, tmp;
int i, j, midx, midy, radius, hr, min, sec;
int x, y, minx, miny;
int hrx, hry, secx, secy;
int secx1, secy1;
char str;
time_t t1;
struct tm *data;

/* initialize graphic mode */
initgraph(&gdriver, &gmode, "C:/TC/BGI");
err = graphresult();

if (err != grOk) {
/* error occurred */
printf("Graphics Error: %s",
grapherrormsg(err));
return 0;
}

/* mid position in x and y -axis */
midx = getmaxx() / 2;
midy = getmaxy() / 2;

radius = 200;

/* position to locate numbers in clock */
calcPoints(radius - 30, midx, midy, x, y);

/* gets position for hour needle */
calcPoints(radius - 90, midx, midy, hrx, hry);

/* gets position for minute needle */
minSecCalc(radius - 50, midx, midy, minx, miny);

/* gets position for second needle */
minSecCalc(radius - 70, midx, midy, secx, secy);

while (!kbhit()) {
setlinestyle(SOLID_LINE, 1, 3);
settextstyle(TRIPLEX_FONT, 0, 3);

/* draws frame of the clock */
circle(midx, midy, radius);

/* place the numbers  in clock */
for (j = 0; j < 12; j++) {
if (j == 0) {
sprintf(str, "%d", 12);
} else {
sprintf(str, "%d", j);
}
settextjustify(CENTER_TEXT, CENTER_TEXT);
moveto(x[j], y[j]);
outtext(str);
}

/* get the current time using time() API */
t1 = time(NULL);
data = localtime(&t1);

/* draw the second needle in clock */
sec = data->tm_sec % 60;
line(midx, midy, secx[sec], secy[sec]);

/* draw the minute needle in clock */
min = data->tm_min % 60;
line(midx, midy, minx[min], miny[min]);

/* draw the hour needle in clock */
hr = data->tm_hour % 12;
line(midx, midy, hrx[hr], hry[hr]);
delay(1000);
cleardevice();
}

getch();

/* deallocate memory allocated for graphic screen */
closegraph();
return 0;
}

Output: (analog clock in c)

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