Kumo

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!

Current Features

• Draw Rectangle, Circle or Image Overlay word clouds. Image Overlay will draw words over all non-transparent pixels.
• Linear, Square-Root Font Scalars. Fully extendable.
• Variable Font Sizes.
• Word Rotation. Just provide a Start Angle, End Angle, and number of slices.
• Custom BackGround Color. Fully customizable BackGrounds coming soon.
• Word Padding.
• Load Custom Color Palettes. Also supports color gradients.
• Two Modes that of Collision and Padding: PIXEL_PERFECT and RECTANGLE.
• Polar Word Clouds. Draw two opposing word clouds in one image to easily compare/contrast date sets.
• Layered Word Clouds. Overlay multiple word clouds.
• WhiteSpace and Chinese Word Tokenizer. Fully extendable.
• Frequency Analyzer to tokenize, filter and compute word counts.
• Command Line Interface

CLI Install via Brew (NEW!)

brew install kumo

Available from Maven Central

<dependency>
    <groupId>com.kennycason</groupId>
    <artifactId>kumo-core</artifactId>
    <version>1.28</version>
</dependency>

Include kumo-tokenizers if you want Chinese serialization. More languages to come.

<dependency>
    <groupId>com.kennycason</groupId>
    <artifactId>kumo-tokenizers</artifactId>
    <version>1.28</version>
</dependency>

Screenshots

Examples

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<WordFrequency> 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<WordFrequency> 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<WordFrequency> 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<WordFrequency> 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<WordFrequency> 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<WordFrequency> wordFrequencies = frequencyAnalyzer.load("text/new_york_positive.txt");
final List<WordFrequency> 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<WordFrequency> wordFrequencies = frequencyAnalyzer.load("text/new_york_positive.txt");
final List<WordFrequency> 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<List<WordFrequency>> 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 < lwc.getLayers(); i++) {
    final FrequencyAnalyzer frequencyAnalyzer = new FrequencyAnalyzer();
    frequencyAnalyzer.setMinWordLength(3);
    frequencyAnalyzer.setNormalizer(NORMALIZERS[i]);
    frequencyAnalyzer.setWordFrequenciesToReturn(1000);
    listOfWordFrequencies.add(frequencyAnalyzer.load("text/english_tide.txt"));

    final WordCloud worldCloud = parallelLayeredWordCloud.getAt(i);
    worldCloud.setAngleGenerator(new AngleGenerator(0));
    worldCloud.setPadding(3);
    worldCloud.setWordStartStrategy(new CenterWordStart());
    worldCloud.setKumoFont(new KumoFont(FONTS[i]));
    worldCloud.setColorPalette(new ColorPalette(colors[i]));

    worldCloud.setBackground(new RectangleBackground(positions[i], dimension));
    worldCloud.setFontScalar(new LinearFontScalar(10, 40));
}

// start building
for (int i = 0; i < lwc.getLayers(); i++) {
    parallelLayeredWordCloud.build(i, listOfWordFreqs.get(i));
}

parallelLayeredWordCloud.writeToFile("parallelBubbleText.png");

Refer to JPanelDemo.java for an example integrating into a JPanel.

Word Frequency File / Analyzer

The most common way to generate word frequencies is to pass a String of text directly to FrequencyAnalyzer. The FrequencyAnalyzer contains many options to process and normalize input text.

Sometimes the word counts and word frequencies are already known and a consumer would like to load them directly into Kumo. To do so, you can manually construct the List<WordFrequency> 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().

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()

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()

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.

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 standard word cloud with a custom width and height.

kumo --input "https://en.wikipedia.org/wiki/Nintendo" --output "/tmp/wordcloud.png" --width 256 --height 256

Create a standard word cloud with custom font configuration.

kumo --input "https://en.wikipedia.org/wiki/Nintendo" --output "/tmp/wordcloud.png" --font-scalar sqrt --font-type Impact --font-weight plain --font-size-min 4 --font-size-max 60

Create a standard word cloud with a custom shape.

kumo --input "https://en.wikipedia.org/wiki/Nintendo" --output "/tmp/wordcloud.png" --width 990 --height 618 --background "https://raw.githubusercontent.com/kennycason/kumo/master/src/test/resources/backgrounds/whale.png

Create a standard word cloud with a custom color palette.

kumo --input "https://en.wikipedia.org/wiki/Nintendo" --output "/tmp/wordcloud.png" --color "(255,0,0),(0,255,0),(0,0,255)"

kumo --input "https://en.wikipedia.org/wiki/Nintendo" --output "/tmp/wordcloud.png" --color "(0xffffff),(0xcccccc),(0x999999),(0x666666),(0x333333)"

Create a standard word cloud using a Chinese tokenizer

kumo --input "https://zh.wikipedia.org/wiki/%E4%BB%BB%E5%A4%A9%E5%A0%82" --output "/tmp/wordcloud.png" --tokenizer chinese

Create a polar word cloud

kumo --input "https://en.wikipedia.org/wiki/Nintendo,https://en.wikipedia.org/wiki/PlayStation" --output "/tmp/nintendo_vs_playstation.png" --type polar --color "(0x00ff00),(0x00dd00),(0x007700)|(0xff0000),(0xdd0000),(0x770000)"

Create a layered word cloud

kumo --input "https://www.haskell.org/, https://en.wikipedia.org/wiki/Haskell_(programming_language)" --output "/tmp/nintendo_vs_playstation.png" --type layered --background "https://raw.githubusercontent.com/kennycason/kumo/master/src/test/resources/backgrounds/haskell_1.bmp,https://raw.githubusercontent.com/kennycason/kumo/master/src/test/resources/backgrounds/haskell_2.bmp" --color "(0xFA6C07),(0xFF7614),(0xFF8936)|(0x080706),(0x3B3029),(0x47362A)"

Contributing

My primary IDE of choice is IntelliJ due to their robust tooling as well as code analysis/inspections. If using IntelliJ IDEA, I recommend importing KumoIntelliJInspections.xml. I am also considering adding Checkstyle support.

New tests that write images should write images out to kumo-core/output_test/ instead of kumo-core/output/ which is now used for images to showcase Kumo.