Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.LinearGradientPaint;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.awt.image.PixelGrabber;

public class Main {
    public static void main(String[] args) {
        int[] pallet = makeGradientPallet();
        System.out.println(getColorFromPallet(pallet, 0.5F));
    }

    private static int[] makeGradientPallet() {
        BufferedImage image = new BufferedImage(100, 1, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = image.createGraphics();
        Point2D start = new Point2D.Float(0f, 0f);
        Point2D end = new Point2D.Float(99f, 0f);
        float[] dist = { 0.0f, 0.5f, 1.0f };
        Color[] colors = { Color.RED, Color.YELLOW, Color.GREEN };
        g2.setPaint(new LinearGradientPaint(start, end, dist, colors));
        g2.fillRect(0, 0, 100, 1);
        g2.dispose();

        int width = image.getWidth(null);
        int[] pallet = new int[width];
        PixelGrabber pg = new PixelGrabber(image, 0, 0, width, 1, pallet, 0, width);
        try {
            pg.grabPixels();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return pallet;
    }

    private static Color getColorFromPallet(int[] pallet, float x) {
        if (x < 0.0 || x > 1.0) {
            throw new IllegalArgumentException("Parameter outside of expected range");
        }
        int i = (int) (pallet.length * x);
        int max = pallet.length - 1;
        int index = i < 0 ? 0 : i > max ? max : i;
        int pix = pallet[index] & 0x00ffffff | (0x64 << 24);
        return new Color(pix, true);
    }
}