/*
 *  File: DrawableStrings.java
 *
 *  A DrawableStrings class with centering capability
 *
 *  Copyright:  Northeast Parallel Architectures Center
 * 
 */

import java.awt.*;

public class DrawableStrings extends Font {

  // Use mutators to set private class variables:
  private int n = 0;        // number of strings
  private String[] string;  // strings to be drawn
  private Color color;      // foreground color
  
  // This constructor takes an array of strings:
  public DrawableStrings( String[] string ) {
    super( "SansSerif", Font.BOLD, 18 );
    this.color = Color.black;
    setString( string );
  }
  
  // To do:  write a constructor that takes a single string...
  
  // This mutator takes an array of strings:
  public void setString( String[] string ) {
    n = string.length;
    this.string = new String[n];
    for ( int i = 0; i < n; i++ ) {
      this.string[i] = string[i];
    }
  }
  // This mutator takes a single string:
  public void setString( String string ) {
    String[] s = { string };
    setString( s );
  }
  
  // Color accessor and mutator:
  public Color getColor() { return this.color; }
  public void setColor( Color color ) {
    if ( color != null ) this.color = color;
  }
  
  // Variables name, style, and size are inherited from Font:
  public void setFontName( String name ) {
    if ( name != null ) this.name = name;
  }
  public void setFontStyle( int style ) {
    this.style = style;
  }
  public void setFontSize( int size ) {
    this.size = size;
  }
  
  // Center the strings in the given component:
  public void centerDraw( Component c ) {
  
    // If there are no strings to draw, do nothing:
    if ( n == 0 ) return;

    // Save the current foreground color:
    if ( this.color != null ) {
      Color color = c.getForeground();
      c.setForeground( this.color );
    }
    
    // Get a graphics object for this component:
    Graphics g = c.getGraphics();
    
    // Methods getName(), getStyle(), and getSize() are
    // inherited from Font:
    g.setFont( new Font( getName(), getStyle(), getSize() ) );
    
    // Get a FontMetrics object:
    FontMetrics fm = g.getFontMetrics();
    
    // Determine the width of the component:
    int componentWidth = c.getSize().width;
    
    // Determine the width of the first string:
    int stringWidth = fm.stringWidth( this.string[0] );
    
    // Calculate the x-coordinate of the first string:
    int x = ( componentWidth - stringWidth )/2;
    
    // Determine the height of the component:
    int componentHeight = c.getSize().height;
    
    // Calculate the height of *any* string:
    int ascent = fm.getAscent();
    int descent = fm.getDescent();
    int stringHeight = ascent + descent;
    
    // Calculate the height of  n  strings:
    int leading = fm.getLeading();
    int height = n * stringHeight + (n - 1) * leading;
      
    // Calculate the y-coordinate of the first string:
    int y = ( componentHeight - height )/2 + ascent;
    
    // Draw the first string at point (x,y):
    g.drawString( this.string[0], x, y );
    
    // Calculate the font height:
    int fontHeight = stringHeight + leading;

    for ( int i = 1; i < n; i++ ) {
       
      // Calculate the width of this string:
      stringWidth = fm.stringWidth( this.string[i] );
      
      // Calculate the x-coordinate of this string:
      x = ( componentWidth - stringWidth )/2;
      
      // Calculate the y-coordinate of this string:
      y += fontHeight;
            
      // Draw the current string at point (x,y):
      g.drawString( this.string[i], x, y );
      
    }
    
    // Restore the original foreground color:
    c.setForeground( color );
      
  }
      
}