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1
21 package net.mlw.vlh.swing.support;
22
23 import java.awt.Color  ;
24 import java.awt.Component ;
25 import java.awt.Graphics ;
26
27 import javax.swing.Icon ;
28 import javax.swing.SwingConstants ;
29
30
34 public class ArrowIcon implements Icon
35 {
36 private int width = 4;
37
38 private int height = 8;
39
40 private int numberOfArrows;
41
42 private int[] xPoints = new int[4];
43
44 private int[] yPoints = new int[4];
45
46 public ArrowIcon(int direction)
47 {
48 this(direction, 1);
49 }
50
51 public ArrowIcon(int direction, int numberOfArrows)
52 {
53 this.numberOfArrows = numberOfArrows;
54 if (direction == SwingConstants.LEFT)
55 {
56 xPoints[0] = width;
57 yPoints[0] = -1;
58 xPoints[1] = width;
59 yPoints[1] = height;
60 xPoints[2] = 0;
61 yPoints[2] = height / 2;
62 xPoints[3] = 0;
63 yPoints[3] = height / 2 - 1;
64 }
65 else if (direction == SwingConstants.RIGHT)
66 {
67 xPoints[0] = 0;
68 yPoints[0] = -1;
69 xPoints[1] = 0;
70 yPoints[1] = height;
71 xPoints[2] = width;
72 yPoints[2] = height / 2;
73 xPoints[3] = width;
74 yPoints[3] = height / 2 - 1;
75 }
76 else
77 {
78 throw new RuntimeException ("Valid directions: SwingConstants.LEFT, SwingConstants.RIGHT.");
79 }
80 }
81
82 public int getIconHeight()
83 {
84 return height;
85 }
86
87 public int getIconWidth()
88 {
89 return (width * numberOfArrows);
90 }
91
92 public void paintIcon(Component c, Graphics g, int x, int y)
93 {
94 int length = xPoints.length;
95
96 for (int number = 0; number < numberOfArrows; number++)
97 {
98 int adjustedXPoints[] = new int[length];
99 int adjustedYPoints[] = new int[length];
100
101 for (int i = 0; i < length; i++)
102 {
103 adjustedXPoints[i] = xPoints[i] + x + (number*width);
104 adjustedYPoints[i] = yPoints[i] + y;
105 }
106
107 if (c.isEnabled())
108 {
109 g.setColor(Color.black);
110 }
111 else
112 {
113 g.setColor(Color.gray);
114 }
115
116 g.fillPolygon(adjustedXPoints, adjustedYPoints, length);
117 }
118 }
119
120 } |
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