Colony

import javax.swing.*;

import java.awt.*;

/**

*         BatteryIcon class

*         Graphical representation of battery level

*/

public class BatteryIcon implements Icon {

        private int width;

        private int height;

        private int level;

        /**

        * Constructs a new BatteryIcon with all default parameters.

        * Default width and height are 50.

        * Default level is 100.

        */

        public BatteryIcon(){

                this(100, 50, 50);

        }

        /**

        * Constructs a new BatteryIcon with default width and height, and with the specified level.

        * Default width and height are 50.

        */

        public BatteryIcon(int startLevel){

                this(startLevel, 50, 50);

        }

        /**

        * Constructs a new BatteryIcon with the specified level, width, and height.

        */

        public BatteryIcon(int startLevel, int w, int h){

                level = startLevel;

                width = w;

                height = h;

        }

        public void paintIcon(Component c, Graphics g, int x, int y) {

                Graphics2D g2d = (Graphics2D) g.create();

                //clear the background

                g2d.setColor(Color.WHITE);

                g2d.fillRect(x + 1, y + 1, width - 2, height - 2);

                //outline

                g2d.setColor(Color.BLACK);

                g2d.drawRect((int)(x + width*.3), y + 2, (int)(width*.4), height - 4);

                //battery life rectangle

                if (level > 50)

                        g2d.setColor(Color.GREEN);

                else if (level > 25)

                        g2d.setColor(Color.YELLOW);

                else

                        g2d.setColor(Color.RED);

                int greenX = (int)(x + 1 + width*.3);

                int greenY = (int)((y+3) + Math.abs(level-100.0)*(height-6)/(100));

                int greenWidth = (int)(width*.4 - 2)+1;

                int greenHeight = 1+(int)(level-0.0)*(height-6)/(100);

                g2d.fillRect(greenX, greenY, greenWidth, greenHeight);

                //text

                g2d.setColor(Color.BLACK);

                g2d.drawString(level + "%", greenX + greenWidth/2 - 10, greenY + greenHeight/2 + 5);

                g2d.dispose();

        }

        /**

        * Sets the battery level for this BatteryIcon. The level should be given in raw form, i.e. 0-255 directly

        * from the robot. The value will be converted to a representative percentage automatically.

        *

        * @param newLevel the new battery reading from the robot that this BatteryIcon will display.

        */

        public void setLevel(int newLevel) {

                level = convert(newLevel);

        }

        public int getIconWidth() {

                return width;

        }

        public int getIconHeight() {

                return height;

        }

        /**

        * Converts a robot battery reading into representable form.

        * Readings from the robot are returned as raw values, 0-255. This method converts the reading into a value

        * from 0 to 100 so that the practical remaining charge is represented.

        *

        * @param x The battery level as returned by the robot.

        * @return The representable battery percentage.

        */

        public int convert (int x) {

            final int DEAD = 110;

            final int FULL = 170;

            if (x < DEAD)

                return 1;

                return (int) ((x-DEAD) * 100 / (FULL-DEAD));

        }

}