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
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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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原文链接：https://blog.csdn.net/oFanJunBin/article/details/20289097
