Java实现的模拟进度计量器（模拟血压计实例）

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 樊俊彬 * @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() {@Overridepublic 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 */@Overridepublic 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();}}

本实例出自<宁夏大学创新实验项目之Android医疗客户端系统>项目一处，在此希望能和大家一起分享交流，旨在抛砖引玉，望各位大侠指导。版权所有，转载请注明出处，尊重知识，敬畏劳动。