嗨，我的问题是，在我的代码我打电话的方法，计算2点之间的差异，然后如果该距离少于7，它会调用另一个类应该改变目标的颜色为红色的方法...我的问题是在我的arraylist我有3或5或取决于用户输入目标...所以我如何指定我的数组列表中的对象将要更改颜色> ???这是我的代码
package project1;
import java.util.*;
import javax.swing.*;
/**
*
* @author Elvis De Abreu
*/
public class TargetGallery
{
/**ArrayList of Targets initialize as a private*/
private ArrayList mytargets = new ArrayList<>();
/**Static object for the Target class*/
static Target tg = new Target();
/**Static object for the RifleSite class*/
static RifleSite rs = new RifleSite();
/**Static object for the TargetGallery class*/
static TargetGallery tgy = new TargetGallery();
/**the number of targets input by the user as private*/
private int number = 0;
/**array that store the distance between 2 point for each target*/
private double[] total;
/**
* Method that build the background of the canvas
* with a picture as a environment
*/
private void buildWorld()
{
StdDraw.setXscale(0, 250);
StdDraw.setYscale(0, 250);
StdDraw.picture(75, 130, "bath.jpeg", 450, 285);
}
/**
* Method that draw a weapon in the middle of the
* canvas as a shooter weapon
*/
private void drawShooter()
{
StdDraw.setXscale(0, 250);
StdDraw.setYscale(0, 250);
StdDraw.picture(125, 0, "weapon.png", 80, 45);
}
/**
* randomly generates X locations for the targets
* add them into the array list
*/
private void createTargets()
{
double x = 125;
double y = 175;
double radius = 7;
String input = JOptionPane.showInputDialog("Type a number" +
"between 2 and 5");
number = Integer.parseInt(input);
for(int i = 0; i < number; i++)
{
Target targ = new Target(x, y, radius);
mytargets.add(targ);
Random rand = new Random();
x = rand.nextInt(400) + 10;
for (Target e: mytargets)
{
if ((e.getX() <= (x+10)) || (e.getX() >= (x-10)))
{
mytargets.clear();
i--;
continue;
}
}
}
}
/**
* Method that run different methods which start the program
*/
public void run()
{
tgy.buildWorld(); //call the buildWorld method
tgy.drawShooter(); //call the drawShooter method
tgy.createTargets(); //call the createTarget method
tgy.simulate(); //call the simulate method
}
/**
* calculates the distance between the RifleSite and the Targets
*/
public void calcDistance()
{
//variable declaration/initialization
double distance;
double distance1;
int i = 0;
total = new double[number];
//for each loop to calculate x and y location of RifleSite and Targets
for (Target e: mytargets)
{
distance = Math.pow(e.getX()-rs.getX(), 2.0);
distance1 = Math.pow(e.getY()-rs.getY(), 2.0);
total[i++] = Math.sqrt(distance + distance1);
}
}
/**
* Method that simulates the game
*/
public void simulate()
{
//Variable declaration/initialization
boolean alive = true;
for(Target e: mytargets)
{
e.drawAlive();
}
rs.drawRifleSite();
//loop that will run while there is still targets alive or user press q
while(alive == true)
{
//if user press a key this
if (StdDraw.hasNextKeyTyped())
{
char ch = StdDraw.nextKeyTyped(); //store the key pressed
//if person press Q will quit the program
if (ch == 'q')
{
int done = JOptionPane.showConfirmDialog(null,
"The Program will close now bye :)");
System.exit(0);
}
else if (ch == 'f')
{
tgy.calcDistance(); //calculates the distance
//if statement to check if the distance if less than radius
for(int i = 0; i < number; i++)
{
if (total[i] <= 7)
{
//THIS IS WHERE MY METHOD SHOULD GO
//SHOULD BE SOMETHING LIKE E.drawDead
}
}
}
}
}
}
/**
* Method for the main of the Program
* @param args the command line arguments
*/
public static void main(String[] args)
{
}
}
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