private Color interpolateColor(
final Stop LOWER_BOUND, final Stop UPPER_BOUND, final double POSITION) {
final double POS =
(POSITION - LOWER_BOUND.getOffset()) / (UPPER_BOUND.getOffset() - LOWER_BOUND.getOffset());
final double DELTA_RED =
(UPPER_BOUND.getColor().getRed() - LOWER_BOUND.getColor().getRed()) * POS;
final double DELTA_GREEN =
(UPPER_BOUND.getColor().getGreen() - LOWER_BOUND.getColor().getGreen()) * POS;
final double DELTA_BLUE =
(UPPER_BOUND.getColor().getBlue() - LOWER_BOUND.getColor().getBlue()) * POS;
final double DELTA_OPACITY =
(UPPER_BOUND.getColor().getOpacity() - LOWER_BOUND.getColor().getOpacity()) * POS;
double red = Helper.clamp(0d, 1d, (LOWER_BOUND.getColor().getRed() + DELTA_RED));
double green = Helper.clamp(0d, 1d, (LOWER_BOUND.getColor().getGreen() + DELTA_GREEN));
double blue = Helper.clamp(0d, 1d, (LOWER_BOUND.getColor().getBlue() + DELTA_BLUE));
double opacity = Helper.clamp(0d, 1d, (LOWER_BOUND.getColor().getOpacity() + DELTA_OPACITY));
return Color.color(red, green, blue, opacity);
}
// ******************** Methods *******************************************
public Color getColorAt(final double POSITION_OF_COLOR) {
if (stops.isEmpty()) return Color.BLACK;
final double POSITION = Helper.clamp(0d, 1d, POSITION_OF_COLOR);
final Color COLOR;
if (stops.size() == 1) {
final Map<Double, Color> ONE_ENTRY = (Map<Double, Color>) stops.entrySet().iterator().next();
COLOR = stops.get(ONE_ENTRY.keySet().iterator().next()).getColor();
} else {
Stop lowerBound = stops.get(0.0);
Stop upperBound = stops.get(1.0);
for (Double fraction : stops.keySet()) {
if (Double.compare(fraction, POSITION) < 0) {
lowerBound = stops.get(fraction);
}
if (Double.compare(fraction, POSITION) > 0) {
upperBound = stops.get(fraction);
break;
}
}
COLOR = interpolateColor(lowerBound, upperBound, POSITION);
}
return COLOR;
}
