1 /*
2 * File: DrawableStrings.java
3 *
4 * A DrawableStrings class with centering capability
5 *
6 * Copyright: Northeast Parallel Architectures Center
7 *
8 */
9
10 import java.awt.*;
11
12 public class DrawableStrings extends Font {
13
14 // Use mutators to set private class variables:
15 private int n = 0; // number of strings
16 private String[] string; // strings to be drawn
17 private Color color; // foreground color
18
19 // This constructor takes an array of strings:
20 public DrawableStrings( String[] string ) {
21 super( "SansSerif", Font.BOLD, 18 );
22 this.color = Color.black;
23 setString( string );
24 }
25
26 // To do: write a constructor that takes a single string...
27
28 // This mutator takes an array of strings:
29 public void setString( String[] string ) {
30 n = string.length;
31 this.string = new String[n];
32 for ( int i = 0; i < n; i++ ) {
33 this.string[i] = string[i];
34 }
35 }
36 // This mutator takes a single string:
37 public void setString( String string ) {
38 String[] s = { string };
39 setString( s );
40 }
41
42 // Color accessor and mutator:
43 public Color getColor() { return this.color; }
44 public void setColor( Color color ) {
45 if ( color != null ) this.color = color;
46 }
47
48 // Variables name, style, and size are inherited from Font:
49 public void setFontName( String name ) {
50 if ( name != null ) this.name = name;
51 }
52 public void setFontStyle( int style ) {
53 this.style = style;
54 }
55 public void setFontSize( int size ) {
56 this.size = size;
57 }
58
59 // Center the strings in the given component:
60 public void centerDraw( Component c ) {
61
62 // If there are no strings to draw, do nothing:
63 if ( n == 0 ) return;
64
65 // Save the current foreground color:
66 if ( this.color != null ) {
67 Color color = c.getForeground();
68 c.setForeground( this.color );
69 }
70
71 // Get a graphics object for this component:
72 Graphics g = c.getGraphics();
73
74 // Methods getName(), getStyle(), and getSize() are
75 // inherited from Font:
76 g.setFont( new Font( getName(), getStyle(), getSize() ) );
77
78 // Get a FontMetrics object:
79 FontMetrics fm = g.getFontMetrics();
80
81 // Determine the width of the component:
82 int componentWidth = c.getSize().width;
83
84 // Determine the width of the first string:
85 int stringWidth = fm.stringWidth( this.string[0] );
86
87 // Calculate the x-coordinate of the first string:
88 int x = ( componentWidth - stringWidth )/2;
89
90 // Determine the height of the component:
91 int componentHeight = c.getSize().height;
92
93 // Calculate the height of *any* string:
94 int ascent = fm.getAscent();
95 int descent = fm.getDescent();
96 int stringHeight = ascent + descent;
97
98 // Calculate the height of n strings:
99 int leading = fm.getLeading();
100 int height = n * stringHeight + (n - 1) * leading;
101
102 // Calculate the y-coordinate of the first string:
103 int y = ( componentHeight - height )/2 + ascent;
104
105 // Draw the first string at point (x,y):
106 g.drawString( this.string[0], x, y );
107
108 // Calculate the font height:
109 int fontHeight = stringHeight + leading;
110
111 for ( int i = 1; i < n; i++ ) {
112
113 // Calculate the width of this string:
114 stringWidth = fm.stringWidth( this.string[i] );
115
116 // Calculate the x-coordinate of this string:
117 x = ( componentWidth - stringWidth )/2;
118
119 // Calculate the y-coordinate of this string:
120 y += fontHeight;
121
122 // Draw the current string at point (x,y):
123 g.drawString( this.string[i], x, y );
124
125 }
126
127 // Restore the original foreground color:
128 c.setForeground( color );
129
130 }
131
132 }