java實現模擬進度計量器
阿新 • • 發佈:2020-07-17
本文例項為大家分享了java模擬進度計量器的具體程式碼,供大家參考,具體內容如下
一、程式說明
1、自定義模擬血壓計外觀圖classMyCanvas 繼承 Canvas類,重寫其中的public void paint(Graphics g)方法,裡邊繪製詳細的介面元件外觀,包括邊框、玻璃外殼、高壓水銀柱、低壓高壓水銀柱、底部水銀圓球、左右側0刻度線、刻度線等。
2、主框架類Blood 繼承 JFrame,設定佈局,新增文字框和輸入框用於為高、低壓賦值。例項化MyCanvas類產生物件bloodCanvas,並將bloodCanvas新增到框架中央區。
3、高壓、低壓計時器highPressTimer,lowPressTimer用於每隔一定的時間去執行特定任務,高壓與低壓更新任務highPressTaskPerformer,lowPressTaskPerformer用於完成進度條更新。
4、程式中的重點:
(1)、繪製動態高壓、低壓進度條,其中低壓水銀柱計時器巢狀於高壓計時器內部,有先後順序,高壓先上升,後低壓下降。
(2)、繪製刻度線演算法。
二、執行效果
三、原始碼
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座標 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; // 框架大小與起始座標 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刻度線的橫縱座標與長度 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); // 新增控制到框架北部區 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畫素/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(); // 低壓水銀柱計時器巢狀於高壓計時器內部,有先後順序(高壓先走,後低壓) 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秒執行一次的事件監聽器 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); // 新增畫布到中央區 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,highPressHeight,true); // 低壓高壓水銀柱 g.setColor(Color.ORANGE); g.fill3DRect(BLOOD_X,startLow,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刻度線起始刻度與座標(刻度線縱座標以line_y漸變) int rightStartDegree = 0; int line_y = ZORELINE_Y; for (; line_y > BLOOD_Y; line_y -= 2) { // 2個畫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,ZORELINE_X + LINE_LENGTH * 2,line_y); g.drawString(rightStartDegree + "",ZORELINE_X + LINE_LENGTH * 3,line_y + 4); rightStartDegree += 10; } } // 左側0刻度線起始刻度與座標(刻度線縱座標以line_y漸變) int leftStartDegree = 0; int leftLine_y = ZORELINE_Y; for (; leftLine_y > BLOOD_Y; leftLine_y -= 6) { // 6個畫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,BLOOD_X - LINE_LENGTH * 2,leftLine_y); g.drawString(leftStartDegree + "",BLOOD_X - LINE_LENGTH * 4,leftLine_y + 4); leftStartDegree += 10; } } } /** * 雙緩衝技術:複雜的計算速度慢於螢幕顯示,用緩衝解決螢幕閃爍問題 */ @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,this.getSize().width,this.getSize().height); paint(gBuffer); gBuffer.dispose(); g.drawImage(iBuffer,this); } } public static void main(String[] args) { // 設定介面的外觀,為系統外觀 try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception e) { e.printStackTrace(); } new Blood(); } }
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