java2D

计算机图形学来日再战：（先立一个flag）

package com.java2d;

/**
 * 实现进行几何变换的圆与字符
 * @author Administrator
 */
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;

import javax.swing.JApplet;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Test1 extends JApplet {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setTitle("Hello 2D");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JApplet applet = new Test1();
        applet.init();
        frame.getContentPane().add(applet);
        frame.pack();
        frame.setVisible(true);
    }

    // 重写初始化函数
    public void init() {
        JPanel panel = new Hello();
        getContentPane().add(panel);
    }

    // 定义一个hello类
    class Hello extends JPanel {
        public Hello() {
            setPreferredSize(new Dimension(640, 480));
        }

        // 重写组件绘制函数
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D) g;
            g2.setColor(Color.blue);
            Ellipse2D e = new Ellipse2D.Double(-100, -50, 200, 100);
            AffineTransform tr = new AffineTransform();
            tr.rotate(Math.PI / 6.0);// 设置旋转变换
            Shape shape = tr.createTransformedShape(e);
            g2.translate(300, 300);
            g2.scale(2, 2);
            g2.draw(shape);
            g2.drawString("Hello 2D", 0, 0);
        }
    }
}

 修改后:

package com.java2d;

/**
 * 实现进行几何变换的圆与字符
 * @author Administrator
 */
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;

import javax.swing.JApplet;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Test1 extends JApplet {
    public static void main(String[] args) {
        JApplet applet = new Test1();
    }
    public Test1(){
        JFrame frame = new JFrame();
        frame.setTitle("Hello 2D");
        this.init();
        frame.getContentPane().add(this);
        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    // 重写初始化函数
    public void init() {
        JPanel panel = new Hello();
        getContentPane().add(panel);
    }

    // 定义一个hello类
    class Hello extends JPanel {
        public Hello() {
            setPreferredSize(new Dimension(640, 480));
        }

        // 重写组件绘制函数
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D) g;
            g2.setColor(Color.blue);
            Ellipse2D e = new Ellipse2D.Double(-100, -50, 200, 100);
            AffineTransform tr = new AffineTransform();
            tr.rotate(Math.PI / 6.0);// 设置旋转变换
            Shape shape = tr.createTransformedShape(e);
            g2.translate(300, 300);
            g2.scale(2, 2);
            g2.draw(shape);
            g2.drawString("Hello 2D", 0, 0);
        }
    }
}