/**
* Copyright 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.waveprotocol.box.server.rpc.render.scroll;
/**
* An immutable, one-dimensional region.
*
* @author hearnden@google.com (David Hearnden)
*/
public final class Extent {
private final double start;
private final double end;
private Extent(double start, double end) {
this.start = start;
this.end = end;
}
public static Extent of(double start, double end) {
return new Extent(start, end);
}
public double getStart() {
return start;
}
public double getEnd() {
return end;
}
public double getSize() {
return end - start;
}
public Extent scale(double s) {
double mid = (end + start) / 2;
double half = s * (end - start) / 2;
return Extent.of(mid -half, mid + half);
}
@Override
public String toString() {
return "[" + start + ", " + end + "]";
}
}