我的朋友和我是java编程的新手，并且正在尝试制作一个简单的游戏。我们的图像透明化了。当我们移动图像时，图像也会划过。任何帮助都会非常多。
package keelbird;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.TimerTask;
import javax.imageio.ImageIO;
public class KeelBird extends JApplet implements KeyListener, ActionListener {
// establish all key variables
private static final long serialVersionUID = 1L;
int changey, changex, changez;
int dump = 1500;
int x = 20, y = 180, z = 250, r = 700, hx = 700, hy = 0;
int gx = 720, gy = 0, ix = 740, iy = 0, jx = 760, jy = 0;
int qx = dump, qy = dump;
int j = dump, k = dump;
int backx = dump, backy = dump;
int rx = 160, ry = 0, grx = dump, gry = dump;
int thealth = 5;
int reload = 0;
int rely = 0;
javax.swing.Timer timer;
BufferedImage yo, bird, explode, health, win, green, red, relImage;
public void init() {
// initialize applet processes, create applet
start();
setSize(800, 400);
setFocusable(true);
setFocusTraversalKeysEnabled(true);
addKeyListener(this);
repaint();
}
public void start() {
// start timer
if (timer == null) {
timer = new javax.swing.Timer(2, this);
timer.start();
} else {
timer.restart();
}
}
public void fire() {
// fire missle method
for(int j = 0; j < 100; j++) {
changex = 4;
repaint();
}
}
public void refire() {
// bring missle back
x = 20;
y = 180;
backx = 0;
backy = 0;
changex = 0;
System.out.println("RELOAD");
repaint();
}
public void paint(Graphics g) {
// paint graphics
int width = 80;
int height = 40;
yo = null;
bird = null;
explode = null;
health = null;
win = null;
BufferedImage background = null;
try {
File u = new File("the missel.png");
yo = ImageIO.read(u);
File w = new File("the dang bird.png");
bird = ImageIO.read(w);
File v = new File("explotions.png");
explode = ImageIO.read(v);
File t = new File("killdatbird.png");
background = ImageIO.read(t);
File h = new File("healthbar.png");
health = ImageIO.read(h);
File q = new File("winner.png");
win = ImageIO.read(q);
File re = new File("red.png");
red = ImageIO.read(re);
File gre = new File("green.png");
green = ImageIO.read(gre);
File rel = new File("reload.png");
relImage = ImageIO.read(rel);
} catch (IOException e) {
System.err.println("You made a Boo-boo");
}
g.drawImage(relImage, 20, rely, 40, 16, null);
g.drawImage(red, rx, ry, 80, 20, null);
g.drawImage(green, grx, gry, 80, 20, null);
g.drawImage(background, backx, backy, 800, 400, null);
g.drawImage(win, qx, qy, 800, 400, null);
g.drawImage(yo, x , y, width, height, null);
g.drawImage(bird, r, z, 40, 40, null);
g.drawImage(explode, j, k, 95, 95, null);
g.drawImage(health, hx,hy , 20, 10, this);
g.drawImage(health, gx,gy , 20, 10, this);
g.drawImage(health, ix,iy , 20, 10, this);
g.drawImage(health, jx,jy , 20, 10, this);
repaint();
}
public void keyPressed(KeyEvent e) {
// move missle up and down
if (e.getKeyCode() == KeyEvent.VK_UP) {
changey = -1;
}
if (e.getKeyCode() == KeyEvent.VK_DOWN) {
changey = 1;
}
// fire the missle
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
fire();
}
// allow reloading of missle
if (reload == 0) {
if(e.getKeyCode() == KeyEvent.VK_R) {
// do nothing
}
}
if (reload == 1) {
if (e.getKeyCode() == KeyEvent.VK_R) {
refire();
java.util.Timer tim = new java.util.Timer();
tim.schedule(new TimerTask() {
public void run() {
backx = dump;
backy = dump;
repaint();
reload = 0;
}
}, 100);
if (thealth == 0) {
thealth = 5;
qx = dump;
qy = dump;
hx = 700;
hy = 0;
gx = 720;
gy = 0;
ix = 740;
iy = 0;
jx = 760;
jy = 0;
}
}
}
repaint(1);
}
public void keyTyped(KeyEvent e) {
// do nothing
}
public void keyReleased(KeyEvent e) {
// no change in missle position if key is released
changey = 0;
}
public void actionPerformed(ActionEvent e) {
changez = (int) (((Math.random() * 4) - 2) * 2);
// set bounds for missle
if (y > 400) {
changey = 0;
y = 400;
}
if (y < 0 ) {
changey = 0;
y = 0;
}
if (x > 700) {
changex = 0;
}
// if max is hit
if (x == 680) {
j = x;
k = y - 20;
x = dump;
y = dump;
changex = 0;
java.util.Timer time = new java.util.Timer();
time.schedule(new TimerTask()
{
public void run() {
j = dump;
k = dump;
repaint();
reload = 1;
}}, 1000);
}
// set bounds for bird
if (z < 0) {
z = 0;
changez = 0;
}
if (z > 370) {
z = 370;
changez = 0;
}
if (reload == 0) {
rx = 160;
ry = 0;
grx = dump;
gry = dump;
repaint();
}
if (reload == 1) {
grx = 160;
gry = 0;
rx = dump;
ry = dump;
repaint();
}
// if bird is hit
if (Math.abs(k - z) <= 30) {
if(Math.abs(j - 700) <= 30) {
// hit casts missle and bird away
changez = 0;
x = dump;
y = dump;
z = dump;
r = dump;
// initiate timer after hit
java.util.Timer time = new java.util.Timer();
time.schedule(new TimerTask()
{
public void run() {
// throw explotion to side
j = dump;
k = dump;
// bird respawns
z = 250;
r = 700;
if (thealth == 4){
jx = dump;
jy = dump;
}
if (thealth == 3){
ix = dump;
iy = dump;
}
if (thealth == 2){
gx = dump;
gy = dump;
}
if (thealth == 1){
hx = dump;
hy = dump;
}
if (thealth == 0) {
qx = 0;
qy = 0;
grx = dump;
gry = dump;
rx = dump;
ry = dump;
rely = dump;
}
System.out.println("GOOD JOB!!!");
repaint();
reload = 1;
}},
1000);
thealth = thealth - 1;
repaint();
}
}
// constant changes in position
x = changex + x;
y = changey + y;
z = changez + z;
repaint(1);
}
}
答案 0 :(得分：2)
这不是您的图片的问题，但是您通过不调用paint来打破super.paint链
paint的一项工作是清除准备绘画的Graphics背景。这很重要，因为Graphics上下文是一个共享资源，这意味着在您之前绘制的所有内容仍然位于Graphics上。
绘画的出现有很多原因，反复出现。您应避免在任何paint方法中加载资源，还应避免在任何repaint方法中调用repaint或任何可能调用paint的方法。这会设置一个讨厌的递归循环，最终会消耗你的CPU周期。
最好避免覆盖paint，尤其是顶级容器。相反，你应该将绘制逻辑（可能是你的程序的其余部分）转移到像JPanel这样的东西，然后覆盖它的paintComponent方法，然后在那里进行绘画。
然后，您可以将面板添加到您喜欢的任何顶级容器中，使其更加便携
请查看Performing Custom Painting了解更多详情......