package com.github.mikephil.charting.utils;
import java.text.DecimalFormat;
/**
* Predefined value-formatter that formats large numbers in a pretty way.
* Outputs: 856 = 856; 1000 = 1k; 5821 = 5.8k; 10500 = 10k; 101800 = 102k;
* 2000000 = 2m; 7800000 = 7.8m; 92150000 = 92m; 123200000 = 123m; 9999999 =
* 10m; 1000000000 = 1b; Special thanks to Roman Gromov
* (https://github.com/romangromov) for this piece of code.
*
* @author Philipp Jahoda
*/
public class LargeValueFormatter implements ValueFormatter {
private static String[] SUFFIX = new String[] {
"", "k", "m", "b", "t"
};
private static int MAX_LENGTH = 4;
private DecimalFormat mFormat;
public LargeValueFormatter() {
mFormat = new DecimalFormat("###E0");
}
@Override
public String getFormattedValue(float value) {
return makePretty(value);
}
/**
* Formats each number properly. Special thanks to Roman Gromov
* (https://github.com/romangromov) for this piece of code.
*/
private String makePretty(double number) {
String r = mFormat.format(number);
r = r.replaceAll("E[0-9]", SUFFIX[Character.getNumericValue(r.charAt(r.length() - 1)) / 3]);
while (r.length() > MAX_LENGTH || r.matches("[0-9]+\\.[a-z]")) {
r = r.substring(0, r.length() - 2) + r.substring(r.length() - 1);
}
return r;
}
}