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support library for libGDX
/** Copyright 2014 Robin Stumm ([email protected], http://dermetfan.net)
*
* 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 net.dermetfan.utils;
import net.dermetfan.utils.math.MathUtils;
/** Appends its {@link #appendices} to a {@code CharSequence}. Determines which is the current appendix from {@link #time} and {@link #durations}.
* @author dermetfan */
public class Appender {
/** @param seq the {@code CharSequence} on which to append {@code appendix}
* @param appendix the {@code CharSequence} to append
* @return {@code seq} with {@code appendix} appended */
public static CharSequence append(CharSequence seq, CharSequence appendix) {
return seq.toString() + appendix;
}
/** the appendix from {@code appendices} at the given {@code time} in {@code durations} */
public static CharSequence appendixAt(float time, CharSequence[] appendices, float[] durations) {
return MathUtils.elementAtSum(time, durations, appendices);
}
/** the {@code CharSequences} to append */
private CharSequence[] appendices;
/** the duration the appendix in {@link #appendices} at the same index is valid */
private float[] durations;
/** the time that passed since the current {@link #appendices appendix} has been selected / {@link #index} has been {@link #update(float) updated} */
private float time;
/** the current index of {@link #appendices} and {@link #durations} */
private int index;
/** instantiates a new {@code Appender} with both {@link #appendices} and {@link #durations} being 1 in length with the given value */
public Appender(CharSequence appendices, float durations) {
set(new CharSequence[] {appendices}, new float[] {durations});
}
/** instantiates a new {@code Appender} with the same {@link #durations duration} for each {@link #appendices appendix} */
public Appender(CharSequence[] appendices, float durations) {
this(appendices, new float[appendices.length]);
for(int i = 0; i < appendices.length; i++)
this.durations[i] = durations;
}
/** @param appendices the {@link #appendices}
* @param durations the {@link #durations} */
public Appender(CharSequence[] appendices, float[] durations) {
set(appendices, durations);
}
/** updates {@link #time} and {@link #index}
* @param delta the amount to add to {@link #time}
* @return the updated {@link #index} */
public float update(float delta) {
if((time += delta) > durations[index]) {
time -= durations[index];
if(++index >= appendices.length)
index = 0;
if(time > durations[index])
time -= (int) (time / durations[index]) * durations[index];
}
return index;
}
/** @return the appendix at the given {@link #time} */
public CharSequence appendixAt(float time) {
return appendixAt(time, appendices, durations);
}
/** @return a {@code CharSequence} representing the given {@code seq} with the value of {@link #appendices} at {@link #index} appended */
public CharSequence append(CharSequence seq) {
return append(seq, appendices[MathUtils.clamp(index, 0, appendices.length - 1)]);
}
/** @return a {@code CharSequence} representing the given {@code seq} with the {@link #appendixAt(float) appendix at} {@link #time} appended */
public CharSequence append(CharSequence seq, float time) {
return append(seq, appendixAt(time));
}
/** @see #update(float)
* @see #append(CharSequence) */
public CharSequence updateAndAppend(CharSequence seq, float delta) {
update(delta);
return append(seq);
}
/** {@code appendices} and {@code durations} must be of the same length
* @param appendices the {@link #appendices} to set
* @param durations the {@link #durations} to set */
public void set(CharSequence[] appendices, float[] durations) {
if(appendices.length != durations.length)
throw new IllegalArgumentException("appendices[] and durations[] must have the same length: " + appendices.length + ", " + durations.length);
this.appendices = appendices;
this.durations = durations;
}
/** sets the same {@link #durations duration} for each {@link #appendices appendix} */
public void set(CharSequence[] appendices, float durations) {
this.appendices = appendices;
this.durations = new float[appendices.length];
for(int i = 0; i < appendices.length; i++)
this.durations[i] = durations;
}
/** @return the {@link #appendices} */
public CharSequence[] getAppendices() {
return appendices;
}
/** @param appendices the {@link #appendices} to set */
public void setAppendices(CharSequence[] appendices) {
set(appendices, durations);
}
/** @return the {@link #durations} */
public float[] getDurations() {
return durations;
}
/** @param durations the {@link #durations} to set */
public void setDurations(float[] durations) {
set(appendices, durations);
}
/** @return the {@link #time} */
public float getTime() {
return time;
}
/** @param time the {@link #time} to set */
public void setTime(float time) {
this.time = time;
}
/** @return the {@link #index} */
public int getIndex() {
return index;
}
/** @param index the {@link #index} to set */
public void setIndex(int index) {
this.index = index;
}
}