/** Rescales the axis to ensure that all data is visible. */
public void autoAdjustRange() {
Plot plot = getPlot();
if (plot == null) {
return; // no plot, no data.
}
if (plot instanceof ValueAxisPlot) {
ValueAxisPlot vap = (ValueAxisPlot) plot;
double lower;
Range r = vap.getDataRange(this);
if (r == null) {
// no real data present
r = getDefaultAutoRange();
lower = r.getLowerBound(); // get lower bound value
} else {
// actual data is present
lower = r.getLowerBound(); // get lower bound value
if (this.strictValuesFlag && !this.allowNegativesFlag && lower <= 0.0) {
// strict flag set, allow-negatives not set and values <= 0
throw new RuntimeException(
"Values less than or equal to " + "zero not allowed with logarithmic axis");
}
}
// apply lower margin by decreasing lower bound:
final double lowerMargin;
if (lower > 0.0 && (lowerMargin = getLowerMargin()) > 0.0) {
// lower bound and margin OK; get log10 of lower bound
final double logLower = (Math.log(lower) / LOG10_VALUE);
double logAbs; // get absolute value of log10 value
if ((logAbs = Math.abs(logLower)) < 1.0) {
logAbs = 1.0; // if less than 1.0 then make it 1.0
} // subtract out margin and get exponential value:
lower = Math.pow(10, (logLower - (logAbs * lowerMargin)));
}
// if flag then change to log version of lowest value
// to make range begin at a 10^n value:
if (this.autoRangeNextLogFlag) {
lower = computeLogFloor(lower);
}
if (!this.allowNegativesFlag && lower >= 0.0 && lower < SMALL_LOG_VALUE) {
// negatives not allowed and lower range bound is zero
lower = r.getLowerBound(); // use data range bound instead
}
double upper = r.getUpperBound();
// apply upper margin by increasing upper bound:
final double upperMargin;
if (upper > 0.0 && (upperMargin = getUpperMargin()) > 0.0) {
// upper bound and margin OK; get log10 of upper bound
final double logUpper = (Math.log(upper) / LOG10_VALUE);
double logAbs; // get absolute value of log10 value
if ((logAbs = Math.abs(logUpper)) < 1.0) {
logAbs = 1.0; // if less than 1.0 then make it 1.0
} // add in margin and get exponential value:
upper = Math.pow(10, (logUpper + (logAbs * upperMargin)));
}
if (!this.allowNegativesFlag && upper < 1.0 && upper > 0.0 && lower > 0.0) {
// negatives not allowed and upper bound between 0 & 1
// round up to nearest significant digit for bound:
// get negative exponent:
double expVal = Math.log(upper) / LOG10_VALUE;
expVal = Math.ceil(-expVal + 0.001); // get positive exponent
expVal = Math.pow(10, expVal); // create multiplier value
// multiply, round up, and divide for bound value:
upper = (expVal > 0.0) ? Math.ceil(upper * expVal) / expVal : Math.ceil(upper);
} else {
// negatives allowed or upper bound not between 0 & 1
// if flag then change to log version of highest value to
// make range begin at a 10^n value; else use nearest int
upper = (this.autoRangeNextLogFlag) ? computeLogCeil(upper) : Math.ceil(upper);
}
// ensure the autorange is at least <minRange> in size...
double minRange = getAutoRangeMinimumSize();
if (upper - lower < minRange) {
upper = (upper + lower + minRange) / 2;
lower = (upper + lower - minRange) / 2;
// if autorange still below minimum then adjust by 1%
// (can be needed when minRange is very small):
if (upper - lower < minRange) {
double absUpper = Math.abs(upper);
// need to account for case where upper==0.0
double adjVal = (absUpper > SMALL_LOG_VALUE) ? absUpper / 100.0 : 0.01;
upper = (upper + lower + adjVal) / 2;
lower = (upper + lower - adjVal) / 2;
}
}
setRange(new Range(lower, upper), false, false);
setupSmallLogFlag(); // setup flag based on bounds values
}
}
/**
* Overridden version that calls original and then sets up flag for log axis processing.
*
* @param range the new range.
*/
public void setRange(Range range) {
super.setRange(range); // call parent method
setupSmallLogFlag(); // setup flag based on bounds values
}
