Function TrackInterval

micropolis-activity/src/sim/w_inter.c:1465–1506

(intervalPtr, value)

	    ^ (intervalPtr->toValue < intervalPtr->fromValue)) {
	value = intervalPtr->toValue;
    }
    intervalPtr->trackValue = value;
    intervalPtr->trackWidth = intervalPtr->maxValue - intervalPtr->minValue;
    if (value <= intervalPtr->minValue) {
      intervalPtr->trackState = -1;
    } else if (value >= intervalPtr->maxValue) {
      intervalPtr->trackState = 1;
    } else {
      intervalPtr->trackState = 0;
    }
    SetInterval(intervalPtr, intervalPtr->minValue, intervalPtr->maxValue, 1);
}


static void
TrackInterval(intervalPtr, value)
    register Interval *intervalPtr;	/* Info about widget. */
    int value;
{
    int result;
    char string[20];
    int min, max, delta, lastmin, lastmax;


    delta = value - intervalPtr->trackValue;
    if (delta == 0) return;

    intervalPtr->trackValue = value;

    min = intervalPtr->minValue;
    max = intervalPtr->maxValue;

    switch (intervalPtr->trackState) {
    case -1: /* left trench */
      min += delta;
      if (min > max) max = min;
      break;
    case 1: /* right trench */
      max += delta;
      if (min > max) min = max;
      break;
    case 0: /* center slider */
      lastmin = min; lastmax = max;
      min += delta; max += delta;
      if ((max - min) != intervalPtr->trackWidth) { /* squished */