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;
 
/**
 * 模擬血壓計類,高壓、低壓
 * 
 * @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;
 
 // 畫布長寬
 private final int CANVAS_WIDTH = 400;
 private final int CANVAS_HEIGHT = 800;
 
 // 玻璃外殼長寬與起始坐標
 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;
 
 // 框架大小與起始坐標
 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刻度線的橫縱坐標與長度
 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;
 
 // 輸入的高壓、低壓
 private int highPressInput, lowPressInput;
 
 // 高、低壓水銀柱的動態(tài)高度
 int highPressHeight = 0;
 int lowPressHeight = 0;
 int startLow = BLOOD_Y;
 
 // 高、低水銀計時器
 Timer highPressTimer, lowPressTimer;
 
 public Blood() {
 
 super("自定義血壓計模型-FreeDoman");
 this.setDefaultCloseOperation(EXIT_ON_CLOSE);
 this.setBounds(300, 50, CANVAS_WIDTH, CANVAS_HEIGHT + 20);
 
 // 添加控制到框架北部區(qū)
 JPanel topPanel = new JPanel();
 this.add(topPanel, BorderLayout.NORTH);
 highPressText = new JTextField(5);
 lowPressText = new JTextField(5);
 
 JButton pressButton = new JButton("顯示");
 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,只到滿足輸入的要求,停止計時
  highPressHeight += 1;
  bloodCanvas.repaint();
  if (highPressHeight == highPressInput * 2) {
  highPressTimer.stop();
 
  // 低壓水銀柱計時器嵌套于高壓計時器內部,有先后順序(高壓先走,后低壓)
  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();
  }
  }
 };
 // 定義每0.01秒執(zhí)行一次的事件監(jiān)聽器
 highPressTimer = new Timer(10, highPressTaskPerformer);
 highPressTimer.start();
 }
 });
 
 topPanel.add(new JLabel("高壓值", JLabel.CENTER));
 topPanel.add(highPressText);
 topPanel.add(new JLabel("低壓值", JLabel.CENTER));
 topPanel.add(lowPressText);
 // topPanel.add(new JLabel("心率", JLabel.CENTER));
 topPanel.add(pressButton);
 // 添加畫布到中央?yún)^(qū)
 this.add(bloodCanvas, BorderLayout.CENTER);
 this.setResizable(false);
 this.setVisible(true);
 }
 
 /**
 * 畫布重繪血壓計
 */
 class MyCanvas extends Canvas {
 public void paint(Graphics g) {
 
 // 畫邊框
 g.setColor(Color.BLUE);
 g.draw3DRect(FRAME_X, FRAME_Y, FRAME_WIDTH, FRAME_HEIGHT, true);
 
 // 畫玻璃外殼
 g.setColor(Color.ORANGE);
 g.fill3DRect(BLOOD_X, BLOOD_Y, BLOOD_WIDTH, BLOOD_HEIGHT, true);
 
 // 高壓水銀柱
 g.setColor(Color.RED);
 g.fill3DRect(BLOOD_X, ZORELINE_Y - highPressHeight, BLOOD_WIDTH,
  highPressHeight, true);
 
 // 低壓高壓水銀柱
 g.setColor(Color.ORANGE);
 g.fill3DRect(BLOOD_X, startLow, BLOOD_WIDTH, lowPressHeight, true);
 
 // 畫底部水銀圓球
 g.setColor(Color.RED);
 g.fillOval(CANVAS_WIDTH / 2 - 30, ZORELINE_Y - 5, 60, 60);
 
 // 右側0刻度線起始刻度與坐標(刻度線縱坐標以line_y漸變)
 int rightStartDegree = 0;
 
 int line_y = ZORELINE_Y;
 for (; line_y > BLOOD_Y; line_y -= 2) {
 
 // 2個像素點為一個最小分度 1度
 g.setColor(Color.BLACK);
 g.drawLine(ZORELINE_X, line_y, ZORELINE_X + LINE_LENGTH, line_y);
 
 // 每隔10最小分度個畫10度刻度線
 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;
 }
 }
 
 // 左側0刻度線起始刻度與坐標(刻度線縱坐標以line_y漸變)
 int leftStartDegree = 0;
 int leftLine_y = ZORELINE_Y;
 for (; leftLine_y > BLOOD_Y; leftLine_y -= 6) {
 
 // 6個像素點為一個最小分度 1度
 g.setColor(Color.BLACK);
 g.drawLine(BLOOD_X, leftLine_y, BLOOD_X - LINE_LENGTH,
  leftLine_y);
 
 // 每隔10最小分度個畫10度刻度線
 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;
 }
 }
 }
 
 /**
 * 雙緩沖技術：復雜的計算速度慢于屏幕顯示，用緩沖解決屏幕閃爍問題
 */
 
 @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) {
 
 // 設置界面的外觀，為系統(tǒng)外觀
 try {
 UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
 } catch (Exception e) {
 e.printStackTrace();
 }
 
 new Blood();
 }
}