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package shcm.shsupercm.util.logic;
import java.util.*;
/**
* This class(or class portion) is a part of SHCM's utilities. Feel free to use without credit.
*/
public class Loops {
/**
* Creates a loop of T with linked intensities allowing for fading between the elements.
* @param items list of items and pause durations(in time units) ordered as they are in the loop
* @param fade time in units to fade between each item
* @param ticks positive raising counter
* @param tpu the amount of ticks per time unit
* @param <T> element type
* @return map of elements and their respective intensities(between 0.0f and 1.0f)
*/
public static <T> Map<T, Float> statelessFadingLoop(List<Map.Entry<T, Float>> items, float fade, int ticks, int tpu) {
Map<T, Float> itemValues = new HashMap<>();
if (items == null || items.size() == 0)
return itemValues;
if (items.size() == 1) {
itemValues.put(items.get(0).getKey(), 1f);
return itemValues;
}
float totalUnitsInLoop = 0f;
for (Map.Entry<T, Float> item : items) {
itemValues.put(item.getKey(), 0f);
totalUnitsInLoop += item.getValue() + fade;
}
float unitInLoop = (ticks % (tpu * totalUnitsInLoop)) / tpu;
for (int i = 0; i < items.size(); i++) {
Map.Entry<T, Float> item = items.get(i);
if (unitInLoop < item.getValue()) {
itemValues.put(item.getKey(), 1f);
break;
} else
unitInLoop -= item.getValue();
if (unitInLoop < fade) {
Map.Entry<T, Float> nextItem = items.get(i + 1 >= items.size() ? 0 : i + 1);
unitInLoop /= fade;
itemValues.put(item.getKey(), 1f - unitInLoop);
itemValues.put(nextItem.getKey(), unitInLoop);
break;
} else
unitInLoop -= fade;
}
return itemValues;
}
}
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