Spectrum.java

Below is the syntax highlighted version of Spectrum.java from §3.1 Using Data Types.

/******************************************************************************
 *  Compilation:  javac Spectrum.java
 *  Execution:    java Spectrum
 *  Dependencies: StdDraw.java
 *
 *  Plot all of the Color values, by drawing for each red value a
 *  256-by-256 array of color chips (one for each green and blue
 *  value).
 *
 ******************************************************************************/

import java.awt.Color;

public class Spectrum {

    public static void main(String[] args) {

        // set scale and turn on animation mode
        StdDraw.setXscale(-1, 256);
        StdDraw.setYscale(-1, 256);
        StdDraw.enableDoubleBuffering();

        // draw the color chips
        for (int r = 0; r < 255; r++) {
            StdOut.println("red = " + r);
            for (int g = 0; g < 255; g++) {
                for (int b = 0; b < 255; b++) {
                    Color c = new Color(r, g, b);
                    StdDraw.setPenColor(c);
                    StdDraw.filledSquare(g, b, 0.5);
                }
            }
            StdDraw.show();
            StdDraw.pause(10);
        }
    }
}