java实现模拟进度计量器

本文实例为大家分享了java模拟进度计量器的具体代码，供大家参考，具体内容如下

一、程序说明

1、自定义模拟血压计外观图class MyCanvas 继承 Canvas类，重写其中的public void paint(Graphics g)方法，里边绘制详细的界面组件外观，包括边框、玻璃外壳、高压水银柱、低压高压水银柱、底部水银圆球、左右侧0刻度线、刻度线等。

2、主框架类Blood 继承 JFrame，设定布局，添加文本框和输入框用于为高、低压赋值。实例化MyCanvas类产生对象bloodCanvas，并将bloodCanvas添加到框架中央区。

3、高压、低压计时器highPressTimer, lowPressTimer用于每隔一定的时间去执行特定任务，高压与低压更新任务highPressTaskPerformer，lowPressTaskPerformer用于完成进度条更新。

4、程序中的重点：

（1）、绘制动态高压、低压进度条，其中低压水银柱计时器嵌套于高压计时器内部,有先后顺序，高压先上升,后低压下降。

（2）、绘制刻度线算法。

二、运行效果

三、源代码

package GraphicsCanvas;

import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.Timer;
import javax.swing.UIManager;

/**
 * 模拟血压计类,高压、低压
 *
 * @author Freedoman
 * @Time 2013-12-10
 */
public class Blood extends JFrame {

 private static final long serialVersionUID = 1L;
 private Image iBuffer;
 private MyCanvas bloodCanvas = new MyCanvas();
 private JTextField highPressText, lowPressText;

 // 画布长宽
 private final int CANVAS_WIDTH = 400;
 private final int CANVAS_HEIGHT = 800;

 // 玻璃外壳长宽与起始坐标
 private final int BLOOD_WIDTH = 30;
 private final int BLOOD_HEIGHT = 650;
 private final int BLOOD_X = CANVAS_WIDTH / 2 - BLOOD_WIDTH / 2;
 private final int BLOOD_Y = 50;

 // 框架大小与起始坐标
 private final int FRAME_WIDTH = 120;
 private final int FRAME_HEIGHT = 720;
 private final int FRAME_X = CANVAS_WIDTH / 2 - FRAME_WIDTH / 2;
 private final int FRAME_Y = BLOOD_Y - 20;

 // 0刻度线的横纵坐标与长度
 private final int ZORELINE_Y = BLOOD_Y + BLOOD_HEIGHT - 10;
 private final int ZORELINE_X = CANVAS_WIDTH / 2 + BLOOD_WIDTH / 2;
 private final int LINE_LENGTH = 8;

 // 输入的高压、低压
 private int highPressInput, lowPressInput;

 // 高、低压水银柱的动态高度
 int highPressHeight = 0;
 int lowPressHeight = 0;
 int startLow = BLOOD_Y;

 // 高、低水银计时器
 Timer highPressTimer, lowPressTimer;

 public Blood() {

 super("自定义血压计模型-FreeDoman");
 this.setDefaultCloseOperation(EXIT_ON_CLOSE);
 this.setBounds(300, 50, CANVAS_WIDTH, CANVAS_HEIGHT + 20);

 // 添加控制到框架北部区
 JPanel topPanel = new JPanel();
 this.add(topPanel, BorderLayout.NORTH);
 highPressText = new JTextField(5);
 lowPressText = new JTextField(5);

 JButton pressButton = new JButton("显示");
 pressButton.addActionListener(new ActionListener() {

  @Override
  public void actionPerformed(ActionEvent arg0) {
  highPressInput = Integer.parseInt(highPressText.getText());
  lowPressInput = Integer.parseInt(lowPressText.getText());

  ActionListener highPressTaskPerformer = new ActionListener() {
   public void actionPerformed(ActionEvent evt) {
   // 高度增加 1像素/0.01s,只到满足输入的要求,停止计时
   highPressHeight += 1;
   bloodCanvas.repaint();
   if (highPressHeight == highPressInput * 2) {
    highPressTimer.stop();

    // 低压水银柱计时器嵌套于高压计时器内部,有先后顺序(高压先走,后低压)
    startLow = ZORELINE_Y - highPressHeight;
    ActionListener lowPressTaskPerformer = new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
     lowPressHeight += 1;
     bloodCanvas.repaint();
     if (lowPressHeight == ZORELINE_Y
      - lowPressInput * 2 - startLow)
     lowPressTimer.stop();
    }
    };
    lowPressTimer = new Timer(10, lowPressTaskPerformer);
    lowPressTimer.start();
   }
   }
  };
  // 定义每0.01秒执行一次的事件监听器
  highPressTimer = new Timer(10, highPressTaskPerformer);
  highPressTimer.start();
  }
 });

 topPanel.add(new JLabel("高压值", JLabel.CENTER));
 topPanel.add(highPressText);
 topPanel.add(new JLabel("低压值", JLabel.CENTER));
 topPanel.add(lowPressText);
 // topPanel.add(new JLabel("心率", JLabel.CENTER));
 topPanel.add(pressButton);
 // 添加画布到中央区
 this.add(bloodCanvas, BorderLayout.CENTER);
 this.setResizable(false);
 this.setVisible(true);
 }

 /**
 * 画布重绘血压计
 */
 class MyCanvas extends Canvas {
 public void paint(Graphics g) {

  // 画边框
  g.setColor(Color.BLUE);
  g.draw3DRect(FRAME_X, FRAME_Y, FRAME_WIDTH, FRAME_HEIGHT, true);

  // 画玻璃外壳
  g.setColor(Color.ORANGE);
  g.fill3DRect(BLOOD_X, BLOOD_Y, BLOOD_WIDTH, BLOOD_HEIGHT, true);

  // 高压水银柱
  g.setColor(Color.RED);
  g.fill3DRect(BLOOD_X, ZORELINE_Y - highPressHeight, BLOOD_WIDTH,
   highPressHeight, true);

  // 低压高压水银柱
  g.setColor(Color.ORANGE);
  g.fill3DRect(BLOOD_X, startLow, BLOOD_WIDTH, lowPressHeight, true);

  // 画底部水银圆球
  g.setColor(Color.RED);
  g.fillOval(CANVAS_WIDTH / 2 - 30, ZORELINE_Y - 5, 60, 60);

  // 右侧0刻度线起始刻度与坐标(刻度线纵坐标以line_y渐变)
  int rightStartDegree = 0;

  int line_y = ZORELINE_Y;
  for (; line_y > BLOOD_Y; line_y -= 2) {

  // 2个像素点为一个最小分度 1度
  g.setColor(Color.BLACK);
  g.drawLine(ZORELINE_X, line_y, ZORELINE_X + LINE_LENGTH, line_y);

  // 每隔10最小分度个画10度刻度线
  if (line_y % 20 == 10) {
   g.setColor(Color.BLUE);
   g.drawLine(ZORELINE_X, line_y,
    ZORELINE_X + LINE_LENGTH * 2, line_y);
   g.drawString(rightStartDegree + "", ZORELINE_X
    + LINE_LENGTH * 3, line_y + 4);
   rightStartDegree += 10;
  }
  }

  // 左侧0刻度线起始刻度与坐标(刻度线纵坐标以line_y渐变)
  int leftStartDegree = 0;
  int leftLine_y = ZORELINE_Y;
  for (; leftLine_y > BLOOD_Y; leftLine_y -= 6) {

  // 6个像素点为一个最小分度 1度
  g.setColor(Color.BLACK);
  g.drawLine(BLOOD_X, leftLine_y, BLOOD_X - LINE_LENGTH,
   leftLine_y);

  // 每隔10最小分度个画10度刻度线
  if (leftLine_y % 20 == 10) {
   g.setColor(Color.BLUE);
   g.drawLine(BLOOD_X, leftLine_y, BLOOD_X - LINE_LENGTH * 2,
    leftLine_y);
   g.drawString(leftStartDegree + "", BLOOD_X - LINE_LENGTH
    * 4, leftLine_y + 4);
   leftStartDegree += 10;
  }
  }
 }

 /**
  * 双缓冲技术：复杂的计算速度慢于屏幕显示，用缓冲解决屏幕闪烁问题
  */

 @Override
 public void update(Graphics g) {
  if (iBuffer == null) {
  iBuffer = createImage(this.getSize().width,
   this.getSize().height);

  }
  Graphics gBuffer = iBuffer.getGraphics();
  gBuffer.setColor(getBackground());
  gBuffer.fillRect(0, 0, this.getSize().width, this.getSize().height);
  paint(gBuffer);
  gBuffer.dispose();
  g.drawImage(iBuffer, 0, 0, this);
 }
 }

 public static void main(String[] args) {

 // 设置界面的外观，为系统外观
 try {
  UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
 } catch (Exception e) {
  e.printStackTrace();
 }

 new Blood();
 }
}

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