GUI的基本使用方式之代码实例（二）

作者：叁念

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1.绘制一个会移动的圆

import java.awt.Color;import java.awt.Graphics;import javax.swing.JFrame;import javax.swing.JPanel;public class Demo05 {    // 1.设置坐标变量x,y    int x = 70;    int y = 70;    public static void main(String[] args) {        Demo05 gui = new Demo05();        gui.go();    }    public void go() {        JFrame jFrame = new JFrame();        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        MyDrawPanel myDrawPanel = new MyDrawPanel();        jFrame.getContentPane().add(myDrawPanel);        jFrame.setSize(300, 300);        jFrame.setVisible(true);        // 2.持续绘制        for (int i = 0; i < 130; i++) {            x++;            y++;            myDrawPanel.repaint();            // 3.设置绘制间隔            try {                Thread.sleep(100);            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }    class MyDrawPanel extends JPanel {        @Override        protected void paintComponent(Graphics g) {            // 4.每次绘制圆的时候将面板用black色的Rect覆盖            g.setColor(Color.black);            g.fillRect(0, 0, this.getWidth(), this.getHeight());            // 5.绘制Oval形状            g.setColor(Color.green);            g.fillOval(x, y, 40, 40);        }    }}

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演示结果：

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2.绘制一个依次减小的矩形/h3>

import java.awt.Color;import java.awt.Graphics;import javax.swing.JFrame;import javax.swing.JPanel;public class Demo06 {    // 1.坐标    int x = 1;    int y = 1;    public static void main(String[] args) {        Demo06 gui = new Demo06();        gui.go();    }    public void go() {        JFrame jFrame = new JFrame();        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        MyDrawP myDrawP = new MyDrawP();        jFrame.getContentPane().add(myDrawP);        jFrame.setSize(500, 270);        jFrame.setVisible(true);        // 2.改变形状以及位置        for (int i = 0; i < 124; i++, x++, y++) {            x++;            myDrawP.repaint();            try {                // 2.缓慢效果                Thread.sleep(50);            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }    class MyDrawP extends JPanel {        @Override        public void paint(Graphics g) {            g.setColor(Color.white);            g.fillRect(0, 0, 500, 250);            g.setColor(Color.blue);            g.fillRect(x, y, 500 - x * 2, 250 - y * 2);        }    }}

演示结果：

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3.绘制各种基本图形

import java.awt.BorderLayout;import java.awt.Color;import java.awt.Graphics;import java.awt.Image;import java.awt.Toolkit;import javax.swing.ImageIcon;import javax.swing.JFrame;import javax.swing.JPanel;public class Demo07 {    public static void main(String[] args) {        JFrame jFrame = new JFrame();        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        jFrame.setSize(300, 300);        jFrame.setVisible(true);        jFrame.getContentPane().add(BorderLayout.CENTER, new JPanel() {            @Override            protected void paintComponent(Graphics g) {                //// 1.绘制一个覆盖指定矩形的圆弧或椭圆弧边框. [x 坐标,y 坐标, 弧的宽度,弧的高度,开始角度,弧跨越的角度]//               g.drawArc(0,0, 100, 50, 0, 360);//               g.fillArc(0,0, 100, 50, 0, 360);                //// 2.绘制一条 直线 [x1 坐标,y1 坐标,x2 坐标,y2 坐标]//               g.drawLine(0, 100, 200, 100);                //// 3.绘制一个 椭圆 [x 左上角的 坐标,左上角坐标,width 宽度,height 高度]//               g.drawOval(0, 0, 100, 200);//               g.fillOval(0, 0, 100, 200);                //// 4.绘制一个 矩形 [x 坐标, y 坐标,width 宽度,height 高度]//               g.drawRect(0, 0, 100, 200);//               g.fillRect(0, 0, 100, 200);                //// 5.绘制一个 圆角矩形 [x 坐标,y 坐标,width 宽度,height高度,arcWidth - 4 个角弧度的水平直径,arcHeight -                //// 4 个角弧度的垂直直径]//               g.drawRoundRect(0, 0, 200, 100, 50, 50);//               g.fillRoundRect(0, 0, 200, 100, 50, 50);                //// 6.绘制一段 文本 [str 要绘制的 文本,x 坐标,y 坐标]//               g.drawString("这是一段文本", 50, 50);                //// 7.绘制一张 图片//               Image image = Toolkit.getDefaultToolkit().getImage("temp.jpg");//               g.drawImage(image, 0, 0, 200, 200, this);                // 8.绘制一个由 x 和 y 坐标数组定义的闭合多边形。每对 (x, y) 坐标定义一个点。                /**                 * 菱形                 *///               int[] xPoint = new int[] { 50, 100, 50, 0 };//               int[] yPoint = new int[] { 100, 50, 0, 50 };//               g.drawPolygon(xPoint, yPoint, 4);                /**                 * 三角形                 *///               int[] xPoint = new int[] { 50, 100, 0};//               int[] yPoint = new int[] { 100, 0, 0 };//               g.drawPolygon(xPoint, yPoint, 3);                /**                 * 不规则五角星                 *///              int[] xPoint = new int[] { 100, 120, 200, 140, 160, 100, 40, 60, 0, 80 };//              int[] yPoint = new int[] { 0, 80, 100, 150, 220, 180, 220, 150, 100, 80 };//              g.drawPolygon(xPoint, yPoint, 10);            }        });    }}

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演示结果：