每次尝试启动它时都会出错，它会出现一个空白窗口和这些错误消息。
Exception in thread "Thread-2" java.lang.IllegalArgumentException: Color parameter outside of expected range: Red Green
at java.awt.Color.testColorValueRange(Unknown Source)
at java.awt.Color.<init>(Unknown Source)
at java.awt.Color.<init>(Unknown Source)
at java.awt.Color.<init>(Unknown Source)
at com.tutorial.main.HUD.render(HUD.java:32)
at com.tutorial.main.Game.render(Game.java:118)
at com.tutorial.main.Game.run(Game.java:85)
at java.lang.Thread.run(Unknown Source)
我怀疑它与渲染有关，但不确定是否有人会帮助。
我已插入以下代码：
package com.tutorial.main;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
import java.util.Random;
public class Game extends Canvas implements Runnable {
private static final long serialVersionUID = 7580815534084638412L;
public static final int WIDTH = 640, HEIGHT = WIDTH / 12 * 9;
private Thread thread;
private boolean running = true;
private Random r;
private Handler handler;
private HUD hud;
private Spawn spawner;
public Game() {
new Window(WIDTH, HEIGHT, "Lets Build a Game!", this);
handler = new Handler();
hud = new HUD();
spawner = new Spawn(handler, hud);
this.addKeyListener(new KeyInput(handler));
r = new Random();
// for(int i = 0; i <1; i++){
//implementing Player1
handler.addObject(new Player(WIDTH / 2 - 32, HEIGHT / 2 - 32, ID.Player, handler));
handler.addObject(new BasicEnemy(r.nextInt(Game.WIDTH), r.nextInt(Game.HEIGHT), ID.BasicEnemy, handler));
//implementing Player2
//handler.addObject(new Player(WIDTH/2-32, HEIGHT/2+64, ID.Player2));
/*for (int i = 0; i < 1; i++){
//implementing BasicEnemy
handler.addObject(new BasicEnemy(r.nextInt(WIDTH), r.nextInt(HEIGHT), ID.BasicEnemy, handler));
}*/
}
public synchronized void start() {
thread = new Thread(this);
thread.start();
}
public synchronized void stop() {
try {
thread.join();
running = false;
} catch (Exception e) {
e.printStackTrace();
}
}
public void run() {
this.requestFocus();
long lastTime = System.nanoTime();
double amountOfTicks = 60.0;
double ns = 1000000000 / amountOfTicks;
double delta = 0;
long timer = System.currentTimeMillis();
int frames = 0;
while (running) {
long now = System.nanoTime();
delta += (now - lastTime) / ns;
lastTime = now;
while (delta >= 1) {
tick();
delta--;
}
if (running) {
render();
frames++;
if (System.currentTimeMillis() - timer > 1000) {
timer += 1000;
//System.out.println("FPS: " + frames);
frames = 0;
}
}
}
}
private void tick() {
handler.tick();
hud.tick();
spawner.tick();
}
private void render() {
BufferStrategy bs = this.getBufferStrategy();
if (bs == null) {
this.createBufferStrategy(3);
return;
}
Graphics g = bs.getDrawGraphics();
g.setColor(Color.BLACK);
g.fillRect(0, 0, WIDTH, HEIGHT);
handler.render(g);
hud.render(g);
g.dispose();
bs.show();
}
public static float clamp(float
var, float min, float max) {
if (var >= max) {
return var = max;
} else if (var <= min) {
return var = min;
} else {
return var;
}
}
public static void main(String args[]) {
Game game = new Game();
game.start();
}
}
package com.tutorial.main;
import java.awt.Canvas;
import javax.swing.*;
import java.awt.Dimension;
public class Window extends Canvas {
private static final long serialVersionUID = -240840600533728354L;
public Window(int width, int height, String title, Game game) {
JFrame frame = new JFrame(title);
frame.setPreferredSize(new Dimension(width, height));
frame.setMinimumSize(new Dimension(width, height));
frame.setMaximumSize(new Dimension(width, height));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.add(game);
frame.setVisible(true);
}
}
package com.tutorial.main;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
public class SmartEnemy extends GameObject{
private Handler handler;
private GameObject player;
public SmartEnemy(int x, int y, ID id, Handler handler) {
super(x, y, id);
this.handler = handler;
for(int i = 0; i < handler.object.size(); i++){
if(handler.object.get(i).getId() == ID.Player) player = handler.object.get(i);
}
}
public Rectangle getBounds(){
return new Rectangle((int)x, (int)y, 32, 32);
}
public void tick() {
handler.addObject(new Trail(x, y,ID.Trail, Color.GREEN, 16, 16, 0.02f, handler));
x += velX;
y += velY;
float diffX = x - player.getX() - 8;
float diffY = y - player.getY() - 8;
float distance = (float) Math.sqrt((x - player.getX()) * (x - player.getX()) + (y - player.getY()) * (y - player.getY()));
velX = (float) ((-1.0/distance) * diffX);
velY = (float) ((-1.0/distance) * diffY);
if (y <= 0 || y >= Game.HEIGHT - 37) velY *= -1;
if (x <= 0 || x >= Game.WIDTH - 16) velX*= -1;
}
public void render(Graphics g) {
g.setColor(Color.GREEN);
g.fillRect((int)x, (int)y, 16, 16);
}
}
package com.tutorial.main;
import java.awt.Graphics;
import java.util.LinkedList;
public class Handler {
LinkedList < GameObject > object = new LinkedList < GameObject > ();
public void tick() {
for (int i = 0; i < object.size(); i++) {
GameObject tempObject = object.get(i);
tempObject.tick();
}
};
public void render(Graphics g) {
for (int i = 0; i < object.size(); i++) {
GameObject tempObject = object.get(i);
tempObject.render(g);
}
}
public void addObject(GameObject object) {
this.object.add(object);
}
public void removeObject(GameObject object) {
this.object.remove(object);
}
}
package com.tutorial.main;
import java.awt.Color;
import java.awt.Graphics;
public class HUD {
public static float HEALTH = 100;
private float greenValue = 255;
private int level = 1;
private float score = 0;
public void tick(){
HEALTH = Game.clamp(HEALTH, 0, 100);
greenValue = Game.clamp(greenValue, 0, 255);
greenValue = HEALTH*2;
score++;
}
public void render(Graphics g){
//Background for Health bar
g.setColor(Color.gray);
g.fillRect(15, 15, 200, 32);
//Health Bar
g.setColor(new Color(75, (float) greenValue, 0));
g.fillRect(15, 15, (int) (HEALTH * 2), 32);
g.setColor(Color.WHITE);
g.drawRect(15, 15, 200, 32);
g.drawString("Score: " + score, 15, 60);
g.drawString("Level: " + level, 15, 75);
}
/*int level = 1, point = 0;
//point scoring system
for(int i = 2; i > 1; i++){
if(HEALTH > 0){
point++;
System.out.println(point);
}
}
}*/
private void score(float score){
this.score = score;
}
public float getScore(){
return score;
}
public int getLevel(){
return level;
}
public void setLevel(int level){
this.level = level;
}
}
package com.tutorial.main;
import java.awt.Graphics;
import java.awt.Rectangle;
public abstract class GameObject {
protected float x, y;
protected ID id;
protected float velX, velY;
public GameObject(float x, float y, ID id){
this.x = x;
this.y = y;
this.id = id;
}
public abstract void tick();
public abstract void render(Graphics g);
public abstract Rectangle getBounds();
public void setX(int x){
this.x = x;
}
public void setY(int y){
this.y = y;
}
public int getX(){
return (int) x;
}
public int getY(){
return (int) y;
}
public void setId(ID id){
this.id = id;
}
public ID getId(){
return id;
}
public void setVelX(int velX){
this.velX = velX;
}
public void setVelY(int velY){
this.velY = velY;
}
public float getVelX(){
return velX;
}
public float getVelY(){
return velY;
}
}
答案 0 :(得分：1)
这个构造函数调用导致了这个问题：
new Color(75, (float) greenValue, 0)
您使用Color(float, float, float)，因为第二个参数的类型为float。如javadocs中所述，此构造函数需要3个float来表示rgb组件。范围从0.0f到1.0f，而不是从0到255，这就是您收到错误的原因（75太大了。）
看起来您不应该使用第二个参数来使该语句使用Color(int, int, int)构造函数。