Traffic simulation

import java.awt.*;

import java.awt.geom.*;

import java.awt.image.BufferedImage;

import javax.swing.*;

public class Traffic extends JPanel {

BufferedImage car;

GeneralPath truck;

int width = 80;

public Traffic() {

car = makeCar();

truck = new GeneralPath();

Dimension d = getPreferredSize();

float dx = (width/2 - 20)/2f;

truck.moveTo(d.width/2+dx, d.height-70);

truck.lineTo(d.width/2+dx+20, d.height-70);

truck.lineTo(d.width/2+dx+20, d.height-40);

truck.lineTo(d.width/2+dx, d.height-40);

truck.closePath();

}

protected void paintComponent(Graphics g) {

super.paintComponent(g);

Graphics2D g2 = (Graphics2D)g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

int w = getWidth();

int h = getHeight();

double x = (w - width)/2;

double y = (h - width)/2;

// Road boundries.

g2.draw(new Line2D.Double(x, 0, x, y));

g2.draw(new Line2D.Double(0, y, x, y));

g2.draw(new Line2D.Double(0, y+width, x, y+width));

g2.draw(new Line2D.Double(x, y+width, x, h));

g2.draw(new Line2D.Double(x+width, y+width, x+width, h));

g2.draw(new Line2D.Double(x+width, y+width, w, y+width));

g2.draw(new Line2D.Double(x+width, y, w, y));

g2.draw(new Line2D.Double(x+width, 0, x+width, y));

// Center stripes.

g2.setStroke(new BasicStroke(1.0f, BasicStroke.CAP_SQUARE,

BasicStroke.JOIN_MITER, 8f,

new float[] { 10f, 10f }, 0));

g2.draw(new Line2D.Double(w/2, 0, w/2, y));

g2.draw(new Line2D.Double(0, y+width/2, x, y+width/2));

g2.draw(new Line2D.Double(w/2, y+width, w/2, h));

g2.draw(new Line2D.Double(x+width, h/2, w, h/2));

// Vehicles.

g2.setPaint(Color.red);

g2.fill(truck);

int ix = w/2 - (width - car.getWidth())/2;

g2.drawImage(car, ix, 50, this);

}

public Dimension getPreferredSize() {

return new Dimension(400,400);

}

private BufferedImage makeCar() {

int w = 20, h = 40, type = BufferedImage.TYPE_INT_RGB;

BufferedImage car = new BufferedImage(w, h, type);

Graphics2D g2 = car.createGraphics();

g2.setBackground(Color.blue);

g2.clearRect(0,0,w,h);

g2.setPaint(Color.red);

g2.drawRect(0,0,w-1,h-1);

g2.dispose();

return car;

}

public static void main(String[] args) {

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.getContentPane().add(new Traffic());

f.pack();

f.setLocationRelativeTo(null);

f.setVisible(true);

}

}

crwooda at 2007-7-8 22:58:47 >