APL/DEV 3.2/TP03/Luminance/LumPanel.java

import javax.swing.JPanel;
import java.awt.*;
import java.util.LinkedList;
import java.util.Random;

public class LumPanel extends JPanel {

    private LinkedList<Color> l;
    int width = 30;
    int offset = 30;
    int height = 60;
    int spacing = 5;

    int mx, my = 0;

    public LumPanel() {
        l = new LinkedList<Color>();

        Random r = new Random();
        for (int i = 0; i < 10; i++) {
            l.add(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));
        }
    }

    private double lerp(double a, double b, double t) {
        return a + (b - a) * t;
    }

    public void removeParralel(int x, int y) {
        double dx = (double)x;
        double dy = (double)y;

        dx -= lerp(offset, 0, dy / (double)height);
        dx -= spacing * Math.floor(dx / width);
        
        int index = (int)Math.floor(dx / width);
        
        if (index >= 0 && index < l.size()) {
            Color c = l.get(index);
            System.out.println("Luminance : " + (21 * c.getRed() + 72 * c.getGreen() + 7 * c.getBlue()));

            l.remove(index);
            repaint();
        }
    }

    public void setMCoords(int x, int y) {
        double dx = (double)x;
        double dy = (double)y;

        dx -= lerp(offset, 0, dy / (double)height);
        dx -= spacing * Math.floor(dx / width);

        this.mx = (int)dx;
        this.my = (int)dy;
        repaint();
    }

    @Override
    protected void paintComponent(Graphics g) {
        Graphics gg = g.create();

        if (isOpaque()) {
            gg.setColor(getBackground());
            gg.fillRect(getX(), getY(), getWidth(), getHeight());
        }

        int i = 0;
        for (Color c : l) {
            Polygon p = new Polygon();

            int x = getX() + spacing * i + width * i;

            p.addPoint(x + offset, getY());
            p.addPoint(x + offset + width, getY());
            p.addPoint(x + width, getY() + height);
            p.addPoint(x, getY() + height);

            gg.setColor(Color.BLACK);
            gg.fillOval(mx-3, my-3, 6, 6);

            gg.setColor(c);
            gg.fillPolygon(p);
            gg.setColor(Color.BLACK);
            gg.drawPolygon(p);
            i++;
        }
    }
}