public <T> void removeAttribute(AttributeKey<T> key) {
if (hasAttribute(key)) {
T oldValue = key.get(this);
attributes.remove(key);
fireAttributeChanged(key, oldValue, key.getDefaultValue());
}
}
/** Gets an attribute from the figure. */
public <T> T getAttribute(AttributeKey<T> key) {
return hasAttribute(key) ? key.get(attributes) : key.getDefaultValue();
}