boid/Display.java

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;

public class Display extends JFrame {
  private static final long serialVersionUID = 8274011568777903027L;
  private int width;
  private int height;
  private DrawableCollection dc;

  public Display(int width, int height, DrawableCollection dc) {
    this.width = width;
    this.height = height;
    this.dc = dc;
    this.setSize(width, height);
    this.setVisible(true);
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);
  }

  @Override
  public void paint(Graphics g) {
    // Doppelpuffer um Flackern zu verhindern
    BufferedImage b = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    Graphics bg = b.getGraphics();

    bg.setColor(Color.BLACK);
    bg.fillRect(0, 0, width, height);
    bg.setColor(Color.WHITE);
    for (Drawable d : dc.get_drawables()) {
      d.draw(bg);
    }

    g.drawImage(b,0, 0, width, height, Color.BLACK, this);
  }
}