processing/core/src/processing/data/FloatList.java at master · h2oop/processing · GitHub

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package processing.data;

import java.util.Arrays;

import java.util.Iterator;

import java.util.Random;

import processing.core.PApplet;

/**

* Helper class for a list of floats. Lists are designed to have some of the

* features of ArrayLists, but to maintain the simplicity and efficiency of

* working with arrays.

* Functions like sort() and shuffle() always act on the list itself. To get

* a sorted copy, use list.copy().sort().

* @webref data:composite

* @see IntList

* @see StringList

public class FloatList implements Iterable<Float> {

int count;

float[] data;

public FloatList() {

data = new float[10];

}

/**

* @nowebref

public FloatList(int length) {

data = new float[length];

}

/**

* @nowebref

public FloatList(float[] list) {

count = list.length;

data = new float[count];

System.arraycopy(list, 0, data, 0, count);

}

/**

* @nowebref

public FloatList(Iterable<Float> iter) {

this(10);

for (float v : iter) {

append(v);

}

/**

* Improve efficiency by removing allocated but unused entries from the

* internal array used to store the data. Set to private, though it could

* be useful to have this public if lists are frequently making drastic

* size changes (from very large to very small).

private void crop() {

if (count != data.length) {

data = PApplet.subset(data, 0, count);

}

/**

* Get the length of the list.

* @webref floatlist:method

* @brief Get the length of the list

public int size() {

return count;

}

public void resize(int length) {

if (length > data.length) {

float[] temp = new float[length];

System.arraycopy(data, 0, temp, 0, count);

data = temp;

} else if (length > count) {

Arrays.fill(data, count, length, 0);

}

count = length;

}

/**

* Remove all entries from the list.

* @webref floatlist:method

* @brief Remove all entries from the list

public void clear() {

count = 0;

}

/**

* Get an entry at a particular index.

* @webref floatlist:method

* @brief Get an entry at a particular index

public float get(int index) {

if (index >= count) {

throw new ArrayIndexOutOfBoundsException(index);

}

return data[index];

}

/**

* Set the entry at a particular index. If the index is past the length of

* the list, it'll expand the list to accommodate, and fill the intermediate

* entries with 0s.

* @webref floatlist:method

* @brief Set the entry at a particular index

public void set(int index, float what) {

if (index >= count) {

data = PApplet.expand(data, index+1);

for (int i = count; i < index; i++) {

data[i] = 0;

}

count = index+1;

}

data[index] = what;

}

/**

* Remove an element from the specified index.

* @webref floatlist:method

* @brief Remove an element from the specified index

public float remove(int index) {

if (index < 0 || index >= count) {

throw new ArrayIndexOutOfBoundsException(index);

}

float entry = data[index];

// int[] outgoing = new int[count - 1];

// System.arraycopy(data, 0, outgoing, 0, index);

// count--;

// System.arraycopy(data, index + 1, outgoing, 0, count - index);

// data = outgoing;

// For most cases, this actually appears to be faster

// than arraycopy() on an array copying into itself.

for (int i = index; i < count-1; i++) {

data[i] = data[i+1];

}

count--;

return entry;

}

// Remove the first instance of a particular value,

// and return the index at which it was found.

public int removeValue(int value) {

int index = index(value);

if (index != -1) {

remove(index);

return index;

}

return -1;

}

// Remove all instances of a particular value,

// and return the number of values found and removed

public int removeValues(int value) {

int ii = 0;

if (Float.isNaN(value)) {

for (int i = 0; i < count; i++) {

if (!Float.isNaN(data[i])) {

data[ii++] = data[i];

}

} else {

for (int i = 0; i < count; i++) {

if (data[i] != value) {

data[ii++] = data[i];

}

int removed = count - ii;

count = ii;

return removed;

}

/** Replace the first instance of a particular value */

public boolean replaceValue(float value, float newValue) {

if (Float.isNaN(value)) {

for (int i = 0; i < count; i++) {

if (Float.isNaN(data[i])) {

data[i] = newValue;

return true;

}

} else {

int index = index(value);

if (index != -1) {

data[index] = newValue;

return true;

}

return false;

}

/** Replace all instances of a particular value */

public boolean replaceValues(float value, float newValue) {

boolean changed = false;

if (Float.isNaN(value)) {

for (int i = 0; i < count; i++) {

if (Float.isNaN(data[i])) {

data[i] = newValue;

changed = true;

}

} else {

for (int i = 0; i < count; i++) {

if (data[i] == value) {

data[i] = newValue;

changed = true;

}

return changed;

}

/**

* Add a new entry to the list.

* @webref floatlist:method

* @brief Add a new entry to the list

public void append(float value) {

if (count == data.length) {

data = PApplet.expand(data);

}

data[count++] = value;

}

public void append(float[] values) {

for (float v : values) {

append(v);

}

public void append(FloatList list) {

for (float v : list.values()) { // will concat the list...

append(v);

}

// public void insert(int index, int value) {

// if (index+1 > count) {

// if (index+1 < data.length) {

// }

// if (index >= data.length) {

// data = PApplet.expand(data, index+1);

// data[index] = value;

// count = index+1;

// } else if (count == data.length) {

// if (index >= count) {

// //int[] temp = new int[count << 1];

// System.arraycopy(data, 0, temp, 0, index);

// temp[index] = value;

// System.arraycopy(data, index, temp, index+1, count - index);

// data = temp;

// } else {

// // data[] has room to grow

// // for() loop believed to be faster than System.arraycopy over itself

// for (int i = count; i > index; --i) {

// data[i] = data[i-1];

// }

// data[index] = value;

// count++;

// }

// same as splice

public void insert(int index, int[] values) {

if (index < 0) {

throw new IllegalArgumentException("insert() index cannot be negative: it was " + index);

}

if (index >= data.length) {

throw new IllegalArgumentException("insert() index " + index + " is past the end of this list");

}

float[] temp = new float[count + values.length];

// Copy the old values, but not more than already exist

System.arraycopy(data, 0, temp, 0, Math.min(count, index));

// Copy the new values into the proper place

System.arraycopy(values, 0, temp, index, values.length);

// if (index < count) {

// The index was inside count, so it's a true splice/insert

System.arraycopy(data, index, temp, index+values.length, count - index);

count = count + values.length;

// } else {

// // The index was past 'count', so the new count is weirder

// count = index + values.length;

// }

data = temp;

}

public void insert(int index, IntList list) {

insert(index, list.values());

}

// below are aborted attempts at more optimized versions of the code

// that are harder to read and debug...

// if (index + values.length >= count) {

// // We're past the current 'count', check to see if we're still allocated

// // index 9, data.length = 10, values.length = 1

// if (index + values.length < data.length) {

// // There's still room for these entries, even though it's past 'count'.

// // First clear out the entries leading up to it, however.

// for (int i = count; i < index; i++) {

// data[i] = 0;

// }

// data[index] =

// }

// if (index >= data.length) {

// int length = index + values.length;

// int[] temp = new int[length];

// System.arraycopy(data, 0, temp, 0, count);

// System.arraycopy(values, 0, temp, index, values.length);

// data = temp;

// count = data.length;

// } else {

// }

// } else if (count == data.length) {

// int[] temp = new int[count << 1];

// System.arraycopy(data, 0, temp, 0, index);

// temp[index] = value;

// System.arraycopy(data, index, temp, index+1, count - index);

// data = temp;

// } else {

// // data[] has room to grow

// // for() loop believed to be faster than System.arraycopy over itself

// for (int i = count; i > index; --i) {

// data[i] = data[i-1];

// }

// data[index] = value;

// count++;

// }

/** Return the first index of a particular value. */

public int index(float what) {

if (indexCache != null) {

try {

return indexCache.get(what);

} catch (Exception e) { // not there

return -1;

}

for (int i = 0; i < count; i++) {

if (data[i] == what) {

return i;

}

return -1;

}

/**

* @webref floatlist:method

* @brief Check if a number is a part of the list

public boolean hasValue(float value) {

if (Float.isNaN(value)) {

for (int i = 0; i < count; i++) {

if (Float.isNaN(data[i])) {

return true;

}

} else {

for (int i = 0; i < count; i++) {

if (data[i] == value) {

return true;

}

return false;

}

/**

* @webref floatlist:method

* @brief Add to a value

public void add(int index, float amount) {

data[index] += amount;

}

/**

* @webref floatlist:method

* @brief Subtract from a value

public void sub(int index, float amount) {

data[index] -= amount;

}

/**

* @webref floatlist:method

* @brief Multiply a value

public void mult(int index, float amount) {

data[index] *= amount;

}

/**

* @webref floatlist:method

* @brief Divide a value

public void div(int index, float amount) {

data[index] /= amount;

}

private void checkMinMax(String functionName) {

if (count == 0) {

String msg =

String.format("Cannot use %s() on an empty %s.",

functionName, getClass().getSimpleName());

throw new RuntimeException(msg);

}

/**

* @webref floatlist:method

* @brief Return the smallest value

public float min() {

checkMinMax("min");

int index = minIndex();

return index == -1 ? Float.NaN : data[index];

}

public int minIndex() {

checkMinMax("minIndex");

float m = Float.NaN;

int mi = -1;

for (int i = 0; i < count; i++) {

// find one good value to start

if (data[i] == data[i]) {

m = data[i];

mi = i;

// calculate the rest

for (int j = i+1; j < count; j++) {

float d = data[j];

if (!Float.isNaN(d) && (d < m)) {

m = data[j];

mi = j;

}

break;

}

return mi;

}

/**

* @webref floatlist:method

* @brief Return the largest value

public float max() {

checkMinMax("max");

int index = maxIndex();

return index == -1 ? Float.NaN : data[index];

}

public int maxIndex() {

checkMinMax("maxIndex");

float m = Float.NaN;

int mi = -1;

for (int i = 0; i < count; i++) {

// find one good value to start

if (data[i] == data[i]) {

m = data[i];

mi = i;

// calculate the rest

for (int j = i+1; j < count; j++) {

float d = data[j];

if (!Float.isNaN(d) && (d > m)) {

m = data[j];

mi = j;

}

break;

}

return mi;

}

public float sum() {

double outgoing = 0;

for (int i = 0; i < count; i++) {

outgoing += data[i];

}

return (float) outgoing;

}

/**

* Sorts the array in place.

* @webref floatlist:method

* @brief Sorts an array, lowest to highest

public void sort() {

Arrays.sort(data, 0, count);

}

/**

* Reverse sort, orders values from highest to lowest

* @webref floatlist:method

* @brief Reverse sort, orders values from highest to lowest

public void sortReverse() {

new Sort() {

@Override

public int size() {

// if empty, don't even mess with the NaN check, it'll AIOOBE

if (count == 0) {

return 0;

}

// move NaN values to the end of the list and don't sort them

int right = count - 1;

while (data[right] != data[right]) {

right--;

if (right == -1) { // all values are NaN

return 0;

}

for (int i = right; i >= 0; --i) {

float v = data[i];

if (v != v) {

data[i] = data[right];

data[right] = v;

--right;

}

return right + 1;

}

@Override

public float compare(int a, int b) {

return data[b] - data[a];

}

@Override

public void swap(int a, int b) {

float temp = data[a];

data[a] = data[b];

data[b] = temp;

}

}.run();

}

// use insert()

// public void splice(int index, int value) {

// }

// public void subset(int start) {

// subset(start, count - start);

// }

// public void subset(int start, int num) {

// for (int i = 0; i < num; i++) {

// data[i] = data[i+start];

// }

// count = num;

// }

/**

* @webref floatlist:method

* @brief Reverse the order of the list elements

public void reverse() {

int ii = count - 1;

for (int i = 0; i < count/2; i++) {

float t = data[i];

data[i] = data[ii];

data[ii] = t;

--ii;

}

/**

* Randomize the order of the list elements. Note that this does not

* obey the randomSeed() function in PApplet.

* @webref floatlist:method

* @brief Randomize the order of the list elements

public void shuffle() {

Random r = new Random();

int num = count;

while (num > 1) {

int value = r.nextInt(num);

num--;

float temp = data[num];

data[num] = data[value];

data[value] = temp;

}

/**

* Randomize the list order using the random() function from the specified

* sketch, allowing shuffle() to use its current randomSeed() setting.

public void shuffle(PApplet sketch) {

int num = count;

while (num > 1) {

int value = (int) sketch.random(num);

num--;

float temp = data[num];

data[num] = data[value];

data[value] = temp;

}

public FloatList copy() {

FloatList outgoing = new FloatList(data);

outgoing.count = count;

return outgoing;

}

/**

* Returns the actual array being used to store the data. For advanced users,

* this is the fastest way to access a large list. Suitable for iterating

* with a for() loop, but modifying the list will have terrible consequences.

public float[] values() {

crop();

return data;

}

/** Implemented this way so that we can use a FloatList in a for loop. */

@Override

public Iterator<Float> iterator() {

// }

// public Iterator<Float> valueIterator() {

return new Iterator<Float>() {

int index = -1;

public void remove() {

FloatList.this.remove(index);

}

public Float next() {

return data[++index];

}

public boolean hasNext() {

return index+1 < count;

}

};

}

/**

* Create a new array with a copy of all the values.

* @return an array sized by the length of the list with each of the values.

* @webref floatlist:method

* @brief Create a new array with a copy of all the values

public float[] array() {

return array(null);

}

/**

* Copy as many values as possible into the specified array.

* @param array

public float[] array(float[] array) {

if (array == null || array.length != count) {

array = new float[count];

}

System.arraycopy(data, 0, array, 0, count);

return array;

}

/**

* Returns a normalized version of this array. Called getPercent() for

* consistency with the Dict classes. It's a getter method because it needs

* to returns a new list (because IntList/Dict can't do percentages or

* normalization in place on int values).

public FloatList getPercent() {

double sum = 0;

for (float value : array()) {

sum += value;

}

FloatList outgoing = new FloatList(count);

for (int i = 0; i < count; i++) {

double percent = data[i] / sum;

outgoing.set(i, (float) percent);

}

return outgoing;

}

public FloatList getSubset(int start) {

return getSubset(start, count - start);

}

public FloatList getSubset(int start, int num) {

float[] subset = new float[num];

System.arraycopy(data, start, subset, 0, num);

return new FloatList(subset);

}

public String join(String separator) {

if (count == 0) {

return "";

}

StringBuilder sb = new StringBuilder();

sb.append(data[0]);

for (int i = 1; i < count; i++) {

sb.append(separator);

sb.append(data[i]);

}

return sb.toString();

}

public void print() {

for (int i = 0; i < size(); i++) {

System.out.format("[%d] %f%n", i, data[i]);

}

@Override

public String toString() {

StringBuilder sb = new StringBuilder();

sb.append(getClass().getSimpleName() + " size=" + size() + " [ ");

for (int i = 0; i < size(); i++) {

if (i != 0) {

sb.append(", ");

}

sb.append(i + ": " + data[i]);

}

sb.append(" ]");

return sb.toString();

}

processing/core/src/processing/data/FloatList.java at master · h2oop/processing · GitHub

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