import greenfoot.*;
import java.awt.Color;
/**
* <p>HealthBar class Creates a Health Bar that counts down the actor's health as he loses it. It can also add to the health, set the health or
* return the value.</p>
*
* <p>The basic constructor calls for two arguments, the actor and the health of the actor to be counted.By default it is located at the coordinates
* 100, 20. The default bar color is red and the border color is white. To use the health bar for an actor whose health is 20, use
* the following code:</p>
*
* <p style = "font-weight: bold">HealthBar healthbar = new HealthBar(this, 20);</p>
*
* <p>The intermediate constructor calls for the actor, the health and the x and y coordinates. To create the same health bar at the location x = 80,
* y = 40, use the following code:</p>
*
* <p style = "font-weight: bold">HealthBar healthbar = new HealthBar(this, 20, 80, 40);</p>
*
* <p>The advanced constructor calls for the actor, the health, the x and y coordinates, the border color, the bar color, the width of the health bar
* and the height of the health bar. To use the health bar above with a black border, a blue bar, a width of 100 and a height of 20, use the following
* code: </p>
*
* <p style = "font-weight: bold">HealthBar healthbar = new HealthBar(this, 20, 80, 40, Color.BLACK, Color.BLUE, 100, 20);</p>
*
* <p>HealthBar has a number of public methods. The ones you will need to use the health bar are displayHealth() and loseHealth().</p>
*
* <p>The <strong>displayHealth()</strong> method is necessary to show the health of your actor. It takes no arguments. When you use the HealthBar class, you must use
* the following code in your act() method:</p>
*
* <p style = "font-weight: bold">healthbar.displayHealth();</p>
*
* <p>The <strong>loseHealth()</strong> method makes your actor lose health when it is damaged by another actor. For example, if your actor loses health when it is hit by
* the Bomb class, you would use the following code:</p>
*
* <p>
* <div style = "font-weight: bold">Actor bomb = getOneIntersectingObject(Bomb.class); // See if you hit a bomb.</div>
* <div style = "font-weight: bold">if(bomb!=null) // If you did...</div>
* <div style = "font-weight: bold">{</div>
* <div style = "font-weight: bold; text-indent: 20px;"> healthbar.loseHealth(); // ...subtract one from your health...</div>
* <div style = "font-weight: bold; text-indent: 20px;"> getWorld().removeObject(bomb); // ...then remove the bomb so it won't take the rest of it. </div>
* <div style = "font-weight: bold">}</div>
* </p>
* <p>You can put an integer argument in the <strong>loseHealth()</strong> method. For example, <strong>losehealth(5)</strong> will make you lose 5 health.</p>
*
* <p>There are several other public methods: <strong>getHealth()</strong>, <strong>addHealth()</strong>, <strong>setHealth()</strong> and
* <strong>fullHealth()</strong>.</p>
*
*
* <p>The <strong>getHealth()</strong> method returns your health. You might use this to remove your actor when it loses all its health. For example, to remove your
* actor when all its health is gone, you could use the code:</p>
* <p>
* <div style = "font-weight: bold">if(healthbar.getHealth()<=0)// If all your health is gone</div>
* <div style = "font-weight: bold; text-indent: 20px;">getWorld().removeObject(this);// remove your actor from the game. </div>
* </p>
* <p>The <strong>addHealth()</strong> method increases your health by one. It can also have an integer argument. So <strong>addHealth(5)</strong> increases your health by 5. </p>
*
* <p>The <strong>setHealth()</strong> method sets your health to the given integer argument. So <strong>setHealth(10)</strong> sets your health to 10. </p>
*
* <p>The <strong>fullHealth()</strong> method sets your health back to the maximum health. </p>
*
* <p>HealthBar won't let your health go below 0 or above the passed maximum amount. </p>
*
* @author Jim Stewart
* @version 1
*/
public class HealthBar extends Actor
{
int health; // Change this to give the ship more or less health.
int maxHealth; //Maximum health you can have
int width = 80; //Default width is 82px
int height = 15; //Default height is 17 px
Color borderColor = Color.WHITE; //Default border color
Color barColor = Color.RED; //Default bar color
float pxPerPoint; //"Width" of each point, in fractional pixels. Will be rounded off when drawn.
Actor theActor; //Whoever's health we're counting
int xLocation = 100; //Default x location is 100 pixels over
int yLocation = 20; //Default y location is 20 pixels over
public HealthBar (Actor theActor, int health) // Simple constructor calls only for the actor and the health of the actor
{
this.theActor = theActor; // Set the actor whose health it is
this.health = health; // Set the health passed
this.maxHealth = health; // Set the maximum health for the fullHealth() reset method
pxPerPoint = ((float)width)/health; //This will give me decimal pixel amounts. It'll be rounded when we draw the bar in update()
}
public HealthBar (Actor theActor, int health, int xLocation, int yLocation)
{
this.theActor = theActor; // Set the actor whose health it is
this.health = health; // Set the health passed
this.maxHealth = health; // Set the maximum health for the fullHealth() reset method
this.xLocation = xLocation; // Set the x location
this.yLocation = yLocation; // Set the y location
pxPerPoint = ((float)width)/health; //This will give me decimal pixel amounts. It'll be rounded when we draw the bar in update()
}
public HealthBar (Actor theActor, int health, int xLocation, int yLocation, Color borderColor, Color barColor, int width, int height)
{
this.theActor = theActor; // Set the actor whose health it is
this.health = health; // Set the health passed
this.maxHealth = health; // Set the maximum health for the fullHealth() reset method
this.xLocation = xLocation; // Set the x location
this.yLocation = yLocation; // Set the y location
this.borderColor = borderColor; // Set the border color
this.barColor = barColor; // Set the bar color
this.width = width; // Set the width
this.height = height; // Set the height
pxPerPoint = ((float)width)/health; //This will give me decimal pixel amounts. It'll be rounded when we draw the bar in update()
}
/**
* Shows the health of the actor. Must be put in the act() method of the actor calling health bar.
*/
public void displayHealth()
{
update(); // Updates the image every turn as the health changes.
if(getWorld()==null) //If we're not in the world...
{
theActor.getWorld().addObject(this, xLocation, yLocation); //...add ourselves to it
}
}
private void update()
{
setImage(new GreenfootImage(width + 2, height + 2)); //Makes blank image of assigned width and height
GreenfootImage myImage = getImage(); //Assigns the image to the variable myImage
myImage.setColor(borderColor); // Sets the drawing color to white
myImage.drawRect(0, 0, width + 1, height + 1); // Draws an empty white 81x16 rectangle
myImage.setColor(barColor); // Sets the drawing color to red
int rectWidth = (int)Math.round(health * pxPerPoint); // rectWidth will be 20 pixels per health bar
myImage.fillRect(1, 1, rectWidth, height); //Draws a filled red rectangle 15 pixels high
// and a width of rectWidth variable
}
public void loseHealth()
{
health--; // Reduce the health by one
if(health<0) //health can't be less than 0.
health =0;
}
public void loseHealth(int amount)
{
health-=amount; // Reduce the health by passed amount
if(health<0) //health can't be less than 0.
health =0;
}
public void addHealth()
{
health++; // Increase the health by one
if(health > maxHealth) //Health can't be greater than max health
health = maxHealth;
}
public void addHealth(int amount)
{
health+=amount; // Increase the health by passed amount
if(health > maxHealth) //Health can't be greater than max health
health = maxHealth;
}
public void setHealth(int amount)
{
if(health>=0) //health can't be less than 0.
{
if(health<=maxHealth) // If the health amount is less than the maximum health
health=amount; // set the health to the passed amount.
else // If not
health = maxHealth; // set it to the max.
}
}
public void fullHealth()
{
health=maxHealth; //Set the health to the maximum
}
public int getHealth()
{
return health; //Return the health
}
}
