Kumo - Java Word Cloud
Kumo's goal is to create a powerful and user friendly Word Cloud API in Java. Kumo directly generates an image file without the need to create an applet as many other libraries do.
Please feel free to jump in and help improve Kumo! There are many places for performance optimization in Kumo!
UPDATE: 2025-06-04. I plan on coming back to this project sometime to address issues, convert the project to Kotlin. Apologies for going dark com.kennycason kumo-core 1.28
Include `kumo-tokenizers` if you want Chinese serialization. More languages to come.
```xml
com.kennycason
kumo-tokenizers
1.28
Example to generate a Word Cloud on top of an image.
final FrequencyAnalyzer frequencyAnalyzer = new FrequencyAnalyzer();
frequencyAnalyzer.setWordFrequenciesToReturn(300);
frequencyAnalyzer.setMinWordLength(4);
frequencyAnalyzer.setStopWords(loadStopWords());
final List wordFrequencies = frequencyAnalyzer.load("text/datarank.txt");
final Dimension dimension = new Dimension(500, 312);
final WordCloud wordCloud = new WordCloud(dimension, CollisionMode.PIXEL_PERFECT);
wordCloud.setPadding(2);
wordCloud.setBackground(new PixelBoundryBackground("backgrounds/whale_small.png"));
wordCloud.setColorPalette(new ColorPalette(new Color(0x4055F1), new Color(0x408DF1), new Color(0x40AAF1), new Color(0x40C5F1), new Color(0x40D3F1), new Color(0xFFFFFF)));
wordCloud.setFontScalar(new LinearFontScalar(10, 40));
wordCloud.build(wordFrequencies);
wordCloud.writeToFile("kumo-core/output/whale_wordcloud_small.png");Example to generate a circular Word Cloud.
final FrequencyAnalyzer frequencyAnalyzer = new FrequencyAnalyzer();
final List wordFrequencies = frequencyAnalyzer.load("text/my_text_file.txt");
final Dimension dimension = new Dimension(600, 600);
final WordCloud wordCloud = new WordCloud(dimension, CollisionMode.PIXEL_PERFECT);
wordCloud.setPadding(2);
wordCloud.setBackground(new CircleBackground(300));
wordCloud.setColorPalette(new ColorPalette(new Color(0x4055F1), new Color(0x408DF1), new Color(0x40AAF1), new Color(0x40C5F1), new Color(0x40D3F1), new Color(0xFFFFFF)));
wordCloud.setFontScalar(new SqrtFontScalar(10, 40));
wordCloud.build(wordFrequencies);
wordCloud.writeToFile("kumo-core/output/datarank_wordcloud_circle_sqrt_font.png");Example to generate a rectangle Word Cloud
final FrequencyAnalyzer frequencyAnalyzer = new FrequencyAnalyzer();
final List wordFrequencies = frequencyAnalyzer.load("text/my_text_file.txt");
final Dimension dimension = new Dimension(600, 600);
final WordCloud wordCloud = new WordCloud(dimension, CollisionMode.RECTANGLE);
wordCloud.setPadding(0);
wordCloud.setBackground(new RectangleBackground(dimension));
wordCloud.setColorPalette(new ColorPalette(Color.RED, Color.GREEN, Color.YELLOW, Color.BLUE));
wordCloud.setFontScalar(new LinearFontScalar(10, 40));
wordCloud.build(wordFrequencies);
wordCloud.writeToFile("kumo-core/output/wordcloud_rectangle.png");Example using Linear Color Gradients
final FrequencyAnalyzer frequencyAnalyzer = new FrequencyAnalyzer();
frequencyAnalyzer.setWordFrequenciesToReturn(500);
frequencyAnalyzer.setMinWordLength(4);
final List wordFrequencies = frequencyAnalyzer.load("text/my_text_file.txt");
final Dimension dimension = new Dimension(600, 600);
final WordCloud wordCloud = new WordCloud(dimension, CollisionMode.PIXEL_PERFECT);
wordCloud.setPadding(2);
wordCloud.setBackground(new CircleBackground(300));
// colors followed by and steps between
wordCloud.setColorPalette(new LinearGradientColorPalette(Color.RED, Color.BLUE, Color.GREEN, 30, 30));
wordCloud.setFontScalar( new SqrtFontScalar(10, 40));
wordCloud.build(wordFrequencies);
wordCloud.writeToFile("kumo-core/output/wordcloud_gradient_redbluegreen.png");Example of tokenizing chinese text into a circle
final FrequencyAnalyzer frequencyAnalyzer = new FrequencyAnalyzer();
frequencyAnalyzer.setWordFrequenciesToReturn(600);
frequencyAnalyzer.setMinWordLength(2);
frequencyAnalyzer.setWordTokenizer(new ChineseWordTokenizer());
final List wordFrequencies = frequencyAnalyzer.load("text/chinese_language.txt");
final Dimension dimension = new Dimension(600, 600);
final WordCloud wordCloud = new WordCloud(dimension, CollisionMode.PIXEL_PERFECT);
wordCloud.setPadding(2);
wordCloud.setBackground(new CircleBackground(300));
wordCloud.setColorPalette(new ColorPalette(new Color(0xD5CFFA), new Color(0xBBB1FA), new Color(0x9A8CF5), new Color(0x806EF5)));
wordCloud.setFontScalar(new SqrtFontScalar(12, 45));
wordCloud.build(wordFrequencies);
wordCloud.writeToFile("kumo-core/output/chinese_language_circle.png");Create a polarity word cloud to contrast two datasets
final FrequencyAnalyzer frequencyAnalyzer = new FrequencyAnalyzer();
frequencyAnalyzer.setWordFrequenciesToReturn(750);
frequencyAnalyzer.setMinWordLength(4);
frequencyAnalyzer.setStopWords(loadStopWords());
final List wordFrequencies = frequencyAnalyzer.load("text/new_york_positive.txt");
final List wordFrequencies2 = frequencyAnalyzer.load("text/new_york_negative.txt");
final Dimension dimension = new Dimension(600, 600);
final PolarWordCloud wordCloud = new PolarWordCloud(dimension, CollisionMode.PIXEL_PERFECT, PolarBlendMode.BLUR);
wordCloud.setPadding(2);
wordCloud.setBackground(new CircleBackground(300));
wordCloud.setFontScalar(new SqrtFontScalar(10, 40));
wordCloud.build(wordFrequencies, wordFrequencies2);
wordCloud.writeToFile("kumo-core/output/polar_newyork_circle_blur_sqrt_font.png");Create a Layered Word Cloud from two images/two word sets
final FrequencyAnalyzer frequencyAnalyzer = new FrequencyAnalyzer();
frequencyAnalyzer.setWordFrequenciesToReturn(300);
frequencyAnalyzer.setMinWordLength(5);
frequencyAnalyzer.setStopWords(loadStopWords());
final List wordFrequencies = frequencyAnalyzer.load("text/new_york_positive.txt");
final List wordFrequencies2 = frequencyAnalyzer.load("text/new_york_negative.txt");
final Dimension dimension = new Dimension(600, 386);
final LayeredWordCloud layeredWordCloud = new LayeredWordCloud(2, dimension, CollisionMode.PIXEL_PERFECT);
layeredWordCloud.setPadding(0, 1);
layeredWordCloud.setPadding(1, 1);
layeredWordCloud.setFontOptions(0, new KumoFont("LICENSE PLATE", FontWeight.BOLD));
layeredWordCloud.setFontOptions(1, new KumoFont("Comic Sans MS", FontWeight.BOLD));
layeredWordCloud.setBackground(0, new PixelBoundryBackground("backgrounds/cloud_bg.bmp"));
layeredWordCloud.setBackground(1, new PixelBoundryBackground("backgrounds/cloud_fg.bmp"));
layeredWordCloud.setColorPalette(0, new ColorPalette(new Color(0xABEDFF), new Color(0x82E4FF), new Color(0x55D6FA)));
layeredWordCloud.setColorPalette(1, new ColorPalette(new Color(0xFFFFFF), new Color(0xDCDDDE), new Color(0xCCCCCC)));
layeredWordCloud.setFontScalar(0, new SqrtFontScalar(10, 40));
layeredWordCloud.setFontScalar(1, new SqrtFontScalar(10, 40));
layeredWordCloud.build(0, wordFrequencies);
layeredWordCloud.build(1, wordFrequencies2);
layeredWordCloud.writeToFile("kumo-core/output/layered_word_cloud.png");Create a ParallelLayeredWordCloud using 4 distinct Rectangles.
Every Rectangle will be processed in a separate thread, thus minimizing build-time significantly NOTE: This will eventually be natively handled along with better internal data structures.
final Dimension dimension = new Dimension(2000, 2000);
ParallelLayeredWordCloud parallelLayeredWordCloud = new ParallelLayeredWordCloud(4, dimension, CollisionMode.PIXEL_PERFECT);
// Setup parts for word clouds
final Normalizer[] NORMALIZERS = new Normalizer[] {
new UpperCaseNormalizer(),
new LowerCaseNormalizer(),
new BubbleTextNormalizer(),
new StringToHexNormalizer()
};
final Font[] FONTS = new Font[] {
new Font("Lucida Sans", Font.PLAIN, 10),
new Font("Comic Sans", Font.PLAIN, 10),
new Font("Yu Gothic Light", Font.PLAIN, 10),
new Font("Meiryo", Font.PLAIN, 10)
};
final List> listOfWordFrequencies = new ArrayList<>();
final Point[] positions = new Point][] { new Point(0, 0), new Point(0, 1000), new Point(1000, 0), new Point(1000, 1000) };
final Color[] colors = new Color[] { Color.RED, Color.WHITE, new Color(0x008080)/* TEAL */, Color.GREEN };
// set up word clouds
for (int i = 0; i ` yourself, or you can load in a text file containing the word frequency and word pairs.
The `FrequencyFileLoader` can be used to load such files. The required format is:100: frog 94: dog 43: cog 20: bog 3: fog 1: log 1: pog
Order does not matter as the `FrequencyFileLoader` will automatically sort the pairs.
### Tokenizers
Tokenizers are the code that splits a sentence/text into a list of words. Currently only two tokenizers are built into Kumo.
To add your own just create a class that override the `Tokenizer` interface and call the `FrequencyAnalyzer.setTokenizer()` or `FrequencyAnalyzer.addTokenizer()`.
| Tokenizer |
|-------------|
| WhiteSpaceWordTokenizer |
| ChineseWordTokenizer |
### Filters
After tokenization, filters are applied to each word to determine whether or not should be omitted from the word list.
To add set the filter, call `FrequencyAnalyzer.setFilter()` or `FrequencyAnalyzer.addFilter()`
| Tokenizer | Description |
|-------------|-------------|
| UrlFilter | A filter to remove words that are urls. |
| CompositeFilter | A wrapper of a collection of filters. |
| StopWordFilter | Internally used, the FrequencyAnalyzer makes this filter easy to use via `FrequencyAnalyzer.setStopWords()`. |
| WordSizeFilter | Internally used, the FrequencyAnalyzer makes this filter easy to use via `FrequencyAnalyzer.setMinWordLength()` and `FrequencyAnalyzer.setMaxWordLength()`. |
### Normalizers
After word tokenization and filtering has occurred you can further transform each word via a normalizer.
The default normalizer ia `lowerCase•characterStripping*trimToEmpty(word)`, the normalizer is even named `DefaultNormalizer`
To add set the normalizer, call `FrequencyAnalyzer.setNormalizer()` or `FrequencyAnalyzer.addNormalizer()`
| Normalizers | Description |
|-------------|-------------|
| CharacterStrippingNormalizer | Constructed with a Pattern, it will replace all matched occurrences with a configurable 'replaceWith' string. The default pattern is `\\.|:|;|\\(|\\)|\"|,|\\?|,|!||/`|
| LowerCaseNormalizer | Converts all text to lowercase. |
| UpperCaseNormalizer | Converts all text to uppercase. |
| TrimToEmptyNormalizer | Trims the text down to an empty string, even if null. |
| UpsideDownNormalizer | Converts A-Z,a-z,0-9 character to an upside-down variant. |
| StringToHexNormalizer | Converts each character to it's hex value and concatenates them. |
| DefaultNormalizer | Combines the TrimToEmptyNormalizer, CharacterStrippingNormalizer, and LowerCaseNormalizer. |
| BubbleTextNormalizer | Replaces A-Z,a-z with characters enclosed in Bubbles ⓐ-ⓩⒶ-Ⓩ (requires a supporting font) |
### Command Line Interface (CLI)
Kumo can now be accessed via CLI. It is not quite as flexible as the programmatic interface yet but should support most of the common needs.
The CLI Documentation can be found [here](https://github.com/kennycason/kumo/blob/master/CLI.md).
The below examples assume you have the jar installed under the name of "kumo". To install via Brew run the following command.
`brew install https://raw.githubusercontent.com/kennycason/kumo/master/script/kumo.rb`
Examples:
Create a standard word cloud.kumo --input "https://en.wikipedia.org/wiki/Nintendo" --output "/tmp/wordcloud.png"
Create a standard word cloud excluding stop words.kumo --input "https://en.wikipedia.org/wiki/Nintendo" --output "/tmp/wordcloud.png" --stop-words "nintendo,the"
Create a standard word cloud with a limited word count.kumo --input "https://en.wikipedia.org/wiki/Nintendo" --output "/tmp/wordcloud.png" --word-count 10
Create a staNo open issues yet, or sync has not completed.