/* ComBox.java */import java.awt.*;import java.lang.*;/** * This class composes a commentary box to be drawn on any drawing panel/canvas. * The width of the commentary box will be determined by the length of the * text string being displayed. */public class ComBox implements DrawingObj {    private String str;    /**     * Top left position of the commentary box. This attribute consists     * of two components: <b>x</b> and <b>y</b> based on the Point class     * in <code>java.awt.*</code>.     * @see Point     */    private Point topLeft;    private int height, width;    private Font font;    private int[] xPts, yPts;    private int nPts;    /**     * Background color of the commentary box specified by <code>     * java.awt.Color</code>.     * @see Color     */    private Color bg;    /**     * Foreground color (text color) of the commentary box specified by <code>     * java.awt.Color</code>.     * @see Color     */    private Color fg;    /**     * Creates a commentary box with its topleft corner at (topLeftX, topLeftY)     * and commentary string specified by the third <code>String</code>     * parameter. By default, the background color is yellow and     * the text is displayed in blue.     * @param topLeftX Integer value specifying the horizontal position of the     * topleft corner of the commentary box.     * @param topLeftY Integer value specifying the vertical position of the     * topleft corner of the commentary box.     * @param str The text string to be displayed on the commentary box.     */    public ComBox(int topLeftX, int topLeftY, String str, Font font) {	this.topLeft = new Point(topLeftX, topLeftY);	this.str = str;	this.fg = Color.blue;	this.bg = Color.yellow;	this.font = font;	height = 30;	width = 7*str.length() + 6;	nPts = 8;	xPts = new int[nPts];	yPts = new int[nPts];	xPts[0] = topLeft.x + 4; xPts[1] = topLeft.x + width - 4;	xPts[2] = xPts[3] = topLeft.x + width;	xPts[4] = xPts[1]; xPts[5] = xPts[0];	xPts[6] = xPts[7] = topLeft.x;	yPts[0] = yPts[1] = topLeft.y;	yPts[2] = topLeft.y + 4;	yPts[3] = topLeft.y + height - 4;	yPts[4] = yPts[5] = topLeft.y + height;	yPts[6] = yPts[3];	yPts[7] = yPts[2];    }    /**     * Creates a commentary box with its topleft corner at (topLeftX, topLeftY)     * and commentary string specified by the third <code>String</code>     * parameter, using the foreground and background colors indicated by     * the fourth and fifth parameters.      *      * @param topLeftX Integer value specifying the horizontal position of the     * topleft corner of the commentary box.     * @param topLeftY Integer value specifying the vertical position of the     * topleft corner of the commentary box.     * @param str The text string to be displayed on the commentary box.     * @param fg Color of the text in the commentary box.     * @param bg Color of the commentary box background.     */    public ComBox(int topLeftX, int topLeftY, String str, Color fg, Color bg,		Font font) {	this.topLeft = new Point(topLeftX, topLeftY);	this.str = str;	this.fg = fg;	this.bg = bg;	this.font = font;	height = 30;	width = 7*str.length() + 6;	nPts = 8;	xPts = new int[nPts];	yPts = new int[nPts];	xPts[0] = topLeft.x + 4; xPts[1] = topLeft.x + width - 4;	xPts[2] = xPts[3] = topLeft.x + width;	xPts[4] = xPts[1]; xPts[5] = xPts[0];	xPts[6] = xPts[7] = topLeft.x;	yPts[0] = yPts[1] = topLeft.y;	yPts[2] = topLeft.y + 4;	yPts[3] = topLeft.y + height - 4;	yPts[4] = yPts[5] = topLeft.y + height;	yPts[6] = yPts[3];	yPts[7] = yPts[2];    }    /**     * Set the text string to be displayed on the commentary box.     * @param str Text string in the form of class String     */    public void setText(String str) {	this.str = str;        width = 7*str.length() + 6;        xPts[0] = topLeft.x + 4; xPts[1] = topLeft.x + width - 4;        xPts[2] = xPts[3] = topLeft.x + width;        xPts[4] = xPts[1]; xPts[5] = xPts[0];        xPts[6] = xPts[7] = topLeft.x;        yPts[0] = yPts[1] = topLeft.y;        yPts[2] = topLeft.y + 4;        yPts[3] = topLeft.y + height - 4;        yPts[4] = yPts[5] = topLeft.y + height;        yPts[6] = yPts[3];        yPts[7] = yPts[2];    }    /**     * Set the top left position of the commentary box.     * @param topLeftX Horizontal position of the top left corner.     * @param topLeftY Vertical position of the top left corner.     */    public void setTopLeft(int topLeftX, int topLeftY) {	this.topLeft = new Point(topLeftX, topLeftY);        xPts[0] = topLeft.x + 4; xPts[1] = topLeft.x + width - 4;        xPts[2] = xPts[3] = topLeft.x + width;        xPts[4] = xPts[1]; xPts[5] = xPts[0];        xPts[6] = xPts[7] = topLeft.x;        yPts[0] = yPts[1] = topLeft.y;        yPts[2] = topLeft.y + 4;        yPts[3] = topLeft.y + height - 4;        yPts[4] = yPts[5] = topLeft.y + height;        yPts[6] = yPts[3];        yPts[7] = yPts[2];    }    /**     * Set the background color of the commentary box.     * @param col Background color, instance of java.awt.color     */    public void setBackground(Color col) {	this.bg = col;    }    /**     * Set the text color of the commentary box.     * @param col Foreground color, instance of java.awt.color     */    public void setColor(Color col) {	this.fg = col;    }    /**     * This method is to be called from the <code>paint(Graphics g)</code>     * method of the drawing panel/canvas. It uses the graphical context     * of the drawing panel/canvas to construct the commentary box on     * the drawing panel/canvas.     * @param g Graphical context from the <code>paint(Graphics g)</code>     * method of the drawing panel/canvas.     * @see Graphics     */    public void draw(Graphics g) {	if (str.length() < 1) return;	g.setColor(bg);	g.fillPolygon(xPts, yPts, nPts);	g.setColor(Color.black);	g.drawPolygon(xPts, yPts, nPts);	g.setColor(fg);	g.setFont(font);	g.drawString(str, topLeft.x + 4, topLeft.y + height - 10);    }    /**     * Move the top left position of the commentary box.     * @param x Horizontal position of the top left corner.     * @param y Vertical position of the top left corner.     * @see setTopLeft     */    public void move(int x, int y) {	setTopLeft(x, y);    }    /**     * @return The X coordinate of the top left corner of the commentary     * box.     */    public int getX() {	return topLeft.x;    }    /**     * @return The Y coordinate of the top left corner of the commentary     * box.     */    public int getY() {	return topLeft.y;    }    /**     * @return The text string to be displayed on the commentary box.     */    public String getText() {	return str;    }}