rectangle.java

java程序设计与问题解决的源代码 含书上程序的源代码和一些补充的程序源码

/**
 Class for drawing rectangles on the screen using keyboard
 characters. Each character is higher than it is wide, so
 these rectangles will look taller than you might expect.
 Inherits getOffset, setOffset, and drawAt from the class
 ShapeBase.
*/
public class Rectangle extends ShapeBase implements RectangleInterface
{
    private int height;
    private int width;
    
    public Rectangle( )
    {
        super( );
        height = 0;
        width = 0;
    }
    
    public Rectangle(int theOffset, int theHeight, int theWidth)
    {
        super(theOffset);
        height = theHeight;
        width = theWidth;
    }
    
    public void set(int newHeight, int newWidth)
    {
        height = newHeight;
        width = newWidth;
    }
    
    /**
     Draws the figure at the current line.
    */
    public void drawHere( )
    {
        drawHorizontalLine( );
        drawSides( );
        drawHorizontalLine( );
    }

    private void drawHorizontalLine( )
    {
        skipSpaces(getOffset( )); 
        for (int count = 0; count < width; count++)
            System.out.print('-');
        System.out.println( );        
    }
    
    private void drawSides( )
    {
        for (int count = 0; count < (height - 2); count++)
            drawOneLineOfSides( );
    }
    
    private void drawOneLineOfSides( )
    {
        skipSpaces(getOffset( )); 
        System.out.print('|');
        skipSpaces(width - 2);        
        System.out.println('|');
    }
    
    //Writes the indicated number of spaces.
    private static void skipSpaces(int number)
    {
        for (int count = 0; count < number; count++)
            System.out.print(' ');
    }
}