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Demo applications for the 2D packing algorithms

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package de.sciss.packing2d.demo;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.util.ArrayList;
import java.util.List;

import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JPanel;
import javax.swing.border.Border;

class DrawCanvas extends JPanel{
    private Canvas canvas;

    public DrawCanvas(){
        this.canvas = new Canvas();
        this.add(canvas);
        this.setBackground(Color.white);
        Border border = BorderFactory.createLineBorder(Color.black);
        this.setBorder(border);
    }

    public void addRectangle(IndexedRectangle r){
        this.canvas.addRectangle(r);
    }
    public void clearRectangles(){
        this.canvas.clearRectangles();
    }
    public void setRectangles(List rectangles){
        this.canvas.setRectangles(rectangles);
        this.canvas.repaint();
    }

    private class Canvas extends JComponent{
        List rectangles;
        public Canvas(){
            this.rectangles = new ArrayList<>();
        }

        public void addRectangle(IndexedRectangle r){
            this.rectangles.add(r);
        }
        public void setRectangles(List rectangles){
            this.rectangles = rectangles;
        }
        public void clearRectangles(){
            this.rectangles.clear();
        }

        public void paintComponent(Graphics g){
            g.setColor(Color.blue);
            for (IndexedRectangle r : this.rectangles){
                int midX = r.x + r.width/2-5;
                int midY = r.y + r.height / 2+5;
                g.drawRect(r.x, r.y, r.width, r.height);
                g.drawString(r.getIndex()+ "", midX, midY);
            }
        }

        public Dimension getPreferredSize(){
            return new Dimension(513, 513);
        }
    }
}