Colorbrewer

Create color blind friendly color palettes in Java.

The color palettes provided by this library are based on the colors provided by the [color brewer project] (http://colorbrewer.org/),

In principle there are three types of palettes provided:

Sequential
Diverging
Qualitative

For each palette any number of steps (=colors) in the palette can be requested.

How to Use

Show a user Dialog

    final ColorPaletteChooserDialog dialog = new ColorPaletteChooserDialog();
    dialog.show();
    if(dialog.wasOKPressed()) {
        Color c = dialog.getColor();
    }

will display this dialog:

Screenshot of a ColorPaletteChooserDIalog

Create a palette programmatically

Get a color palette with a specific number of color:

    boolean colorBlindSave = true;
        ColorBrewer[] sequentialPalettes = ColorBrewer.getSequentialColorPalettes(colorBlindSave);  

        ColorBrewer myBrewer = sequentialPalettes[0];

        System.out.println( "Name of this color brewer: " + myBrewer);

        // I want a gradient of 8 colors:
        Color[] myGradient = myBrewer.getColorPalette(8);

        // These are the color codes:
        for (Color color: myGradient){
            // convert to hex for web display:
            String hex = Integer.toHexString(color.getRGB() & 0xffffff);            
            System.out.println("#"+hex+";");
        }

        return myGradient;

This provides the following 8 blue colors: The 'Blues' color palette

Installation

This project is now hosted on Maven Central. You can install the jar file by adding this to your project configuration:

<dependencies>
 <dependency>
  <groupId>org.biojava</groupId>
  <artifactId>jcolorbrewer</artifactId>
  <version>5.2</version>
 </dependency>
</dependencies>

Example Application

Here we are coloring the various components of the virus structure of the human poliovirus ( PDB ID 3J69 ) .

PDB ID 3J69

Acknowledgments

Colors from www.ColorBrewer.org by Cynthia A. Brewer, Geography, Pennsylvania State University.