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Add lighten(), darken(), saturate(), desaturate().

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Natalie Weizenbaum 2016-09-21 10:22:46 -07:00 committed by Natalie Weizenbaum
parent d2591122db
commit 5873083110
1 changed files with 32 additions and 0 deletions
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32
lib/src/functions.dart
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@ -148,6 +148,38 @@ void defineCoreFunctions(Environment environment) {
return color.changeHsl(hue: color.hue + degrees.value);
}));
environment.setFunction(
new BuiltInCallable("lighten", r"$color, $amount", (arguments) {
var color = arguments[0].assertColor("color");
var amount = arguments[1].assertNumber("amount");
return color.changeHsl(
lightness: color.lightness + amount.valueInRange(0, 100, "amount"));
}));
environment.setFunction(
new BuiltInCallable("darken", r"$color, $amount", (arguments) {
var color = arguments[0].assertColor("color");
var amount = arguments[1].assertNumber("amount");
return color.changeHsl(
lightness: color.lightness - amount.valueInRange(0, 100, "amount"));
}));
environment.setFunction(
new BuiltInCallable("saturate", r"$color, $amount", (arguments) {
var color = arguments[0].assertColor("color");
var amount = arguments[1].assertNumber("amount");
return color.changeHsl(
saturation: color.saturation + amount.valueInRange(0, 100, "amount"));
}));
environment.setFunction(
new BuiltInCallable("desaturate", r"$color, $amount", (arguments) {
var color = arguments[0].assertColor("color");
var amount = arguments[1].assertNumber("amount");
return color.changeHsl(
saturation: color.saturation - amount.valueInRange(0, 100, "amount"));
}));
// ## Introspection
environment.setFunction(new BuiltInCallable("inspect", r"$value",