/** Encodes a colorizer into a style Rule. */
public static Rule encode(Colorizer c, Rule rule) {
rule.put("raster-colorizer-default-mode", c.mode);
rule.put("raster-colorizer-default-color", c.color);
Mixed mixed = new Mixed();
for (Colorizer.Stop stop : c.stops()) {
Function f =
new Function("stop") {
@Override
public Object evaluate(Object obj) {
return null;
}
};
f.args().add(new Literal(stop.value));
f.args().add(new Literal(stop.color));
f.args().add(new Literal(stop.mode));
f.args().add(new Literal(stop.epsilon));
mixed.expressions().add(f);
}
rule.put("raster-colorizer-stops", mixed);
return rule;
}
/** Decodes a colorizer from a style Rule. */
public static Colorizer decode(Rule rule) {
Colorizer.Builder cb = Colorizer.build();
cb.mode(
Colorizer.Mode.valueOf(
rule.string(null, "raster-colorizer-default-mode", "linear").toUpperCase(Locale.ROOT)));
cb.color(rule.color(null, "raster-colorizer-default-color", RGB.black));
if (rule.has("raster-colorizer-stops")) {
// TODO: make this routine more robust
Mixed m = (Mixed) rule.get("raster-colorizer-stops");
for (Expression expr : m.expressions()) {
Function stop = (Function) expr;
List<Expression> args = stop.args();
Double value = Convert.toNumber(args.get(0).evaluate(null)).get().doubleValue();
RGB color = RGB.convert(args.get(1).evaluate(null)).get();
if (args.size() > 2) {
Mode mode = Mode.valueOf(args.get(2).evaluate(null).toString().toUpperCase(Locale.ROOT));
if (args.size() > 3) {
double epsilon = Convert.toNumber(args.get(3).evaluate(null), Double.class).get();
if (epsilon != 0d) {
cb.stop(value, color, epsilon);
} else {
cb.stop(value, color, mode);
}
} else {
cb.stop(value, color, mode);
}
} else {
cb.stop(value, color);
}
}
}
return cb.colorizer();
}