private static double getAutomaticTint(final int index) {

		final double[] idxArray = { 0, 0.25, 0.5, -0.25, -0.5, 0.1, 0.3,
				-0.1, -0.3 };
		int i = index / AUTOCOLORSIZE;
		if (i >= idxArray.length) {
			return 0;
		} else {
			return idxArray[i];
		}
	}
private static double getAutomaticTint(final int index) {

		final double[] idxArray = { 0, 0.25, 0.5, -0.25, -0.5, 0.1, 0.3,
				-0.1, -0.3 };
		int i = index / AUTOCOLORSIZE;
		if (i >= idxArray.length) {
			return 0;
		} else {
			return idxArray[i];
		}
	}
private static double getAutomaticTint ( final int index ) { final double [ ] idxArray = { 0 , 0.25 , 0.5 , - 0.25 , - 0.5 , 0.1 , 0.3 , - 0.1 , - 0.3 } ; int i = index / AUTOCOLORSIZE ; if ( i >= idxArray . length ) { return 0 ; } else { return idxArray [ i ] ; } }
Get automatic tint number for specified index line. The default automatic
color only have 6 colors. If there are more than 6 lines then use tint
for next round, e.g. color7 = color1 + tint (0.25)

@param index
line index.
@return tint.
Get automatic tint number for specified index line . The default automatic color only have 6 colors . If there are more than 6 lines then use tint for next round e . g . color7 = color1 + tint ( 0 . 25 )