ecurve.java

JAVA编程百例书中各章节的所有例子的源代码,包括套接字编程

package ch06.section03;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;

public class ECurve
    extends JPanel {

  final static Color bg = Color.white;
  final static Color fg = Color.black;
  final static Color red = Color.red;
  final static Color white = Color.white;

  final static BasicStroke stroke = new BasicStroke(1.0f);
  final static float dash1[] = {
      10.0f};
  final static BasicStroke dashed = new BasicStroke(1.0f,
      BasicStroke.CAP_BUTT,
      BasicStroke.JOIN_MITER,
      10.0f, dash1, 0.0f);

  public ECurve() {
    setBackground(bg);
  }

  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D) g;
    drawShapes(g2);
  }

  static void drawShapes(Graphics2D g2) {
    int gridWidth = 600 / 6;
    int gridHeight = 250 / 2;

    int rowspacing = 5;
    int columnspacing = 7;
    int rectWidth = gridWidth - columnspacing;
    int rectHeight = gridHeight - rowspacing;

    Color fg3D = Color.lightGray;

    g2.setPaint(fg3D);
    g2.drawRect(50, 50, 505 - 1, 130);
    g2.setPaint(fg);

    int x = 55;
    int y = 57;

    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setStroke(stroke);

    // 画一个二次曲线
    g2.draw(new QuadCurve2D.Double(x, y, x + (int) (rectWidth / 2),
                                   y + rectHeight, x + rectWidth, y));
    x += gridWidth;

    //画一个三次曲线
    g2.draw(new CubicCurve2D.Double(x, y, x + (int) (rectWidth / 2),
                                    y + rectHeight, x + (int) (rectWidth / 2),
                                    y + rectHeight, x + rectWidth, y));
    x += gridWidth;

    // 画一段圆弧
    g2.draw(new Arc2D.Double(x, y, rectWidth, rectWidth, 90,
                             180, Arc2D.OPEN));
    x += gridWidth;

    // 画一个圆
    g2.draw(new Ellipse2D.Double(x, y, rectWidth, rectWidth));
    x += gridWidth;

    // 画一个椭圆
    g2.draw(new Ellipse2D.Double(x, y, rectWidth, rectHeight));
    x += gridWidth;
  }

  public static void main(String[] args) {
    WindowListener l = new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }

      public void windowClosed(WindowEvent e) {
        System.exit(0);
      }
    };
    JFrame f = new JFrame();
    f.addWindowListener(l);
    JPanel panel = new JPanel();
    f.getContentPane().add(BorderLayout.SOUTH, panel);
    f.getContentPane().add(BorderLayout.CENTER, new ECurve());
    f.setSize(610, 350);
    f.show();
  }

}