Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

13.9 Case Study: The StillClock Class 503
34 public int getMinute() {
35 return minute;
36 }
37
38 /** Set a new minute */
39 public void setMinute(int minute) {
40 this.minute = minute;
41 repaint();
42 }
43
44 /** Return second */
45 public int getSecond() {
46 return second;
47 }
48
49 /** Set a new second */
50 public void setSecond(int second) {
51 this.second = second;
52 repaint();
53 }
54
55 @Override /** Draw the clock */
56 protected void paintComponent(Graphics g) {
57 super.paintComponent(g);
58
59 // Initialize clock parameters
60 int clockRadius =
61 (int)(Math.min(getWidth(), getHeight()) * 0.8 * 0.5);
62 int xCenter = getWidth() / 2;
63 int yCenter = getHeight() / 2;
64
65 // Draw circle
66 g.setColor(Color.BLACK);
67 g.drawOval(xCenter - clockRadius, yCenter - clockRadius,
68 2 * clockRadius, 2 * clockRadius);
69 g.drawString("12", xCenter - 5, yCenter - clockRadius + 12);
70 g.drawString("9", xCenter - clockRadius + 3, yCenter + 5);
71 g.drawString("3", xCenter + clockRadius - 10, yCenter + 3);
72 g.drawString("6", xCenter - 3, yCenter + clockRadius - 3);
73
74 // Draw second hand
75 int sLength = (int)(clockRadius * 0.8);
76 int xSecond = (int)(xCenter + sLength *
77 Math.sin(second * (2 * Math.PI / 60)));
78 int ySecond = (int)(yCenter - sLength *
79 Math.cos(second * (2 * Math.PI / 60)));
80 g.setColor(Color.red);
81 g.drawLine(xCenter, yCenter, xSecond, ySecond);
82
83 // Draw minute hand
84 int mLength = (int)(clockRadius * 0.65);
85 int xMinute = (int)(xCenter + mLength *
86 Math.sin(minute * (2 * Math.PI / 60)));
87 int yMinute = (int)(yCenter - mLength *
88 Math.cos(minute * (2 * Math.PI / 60)));
89 g.setColor(Color.blue);
90 g.drawLine(xCenter, yCenter, xMinute, yMinute);
91
92 // Draw hour hand
93 int hLength = (int)(clockRadius * 0.5);
repaint panel
repaint panel
override paintComponent