我的问题是，当一个球物体与屏幕的左侧，右侧或顶部碰撞时，或者与任一块砖块碰撞时，它都会反转所有球的速度，例如，如果球1撞击左壁，它将在相反的X方向弹回。但是，即使第2球不与任何东西碰撞，第2球也会做同样的事情（第2球碰到东西时第1球也会发生同样的事情）。
我正在使用Processing开发环境。但是，它使用Java，特别是PApplet类
这是我移动球的方法：
void moveBalls(){
PVector ballPos;
for(balls b : ballsCollection){
ballPos = b.getPos();
if(b.isMoving()) {
//make the ball bounce off the walls
if(ballPos.y > height - blockSize){ //bottom
if(ballsInMotion == ballsCollection.size()){
ballPos.y = height - ballSize/2 - blockSize - 3;
ballStartX = ballPos.x;
ballStartY = height - blockSize - ballSize - ballSize/2;
b.invertMoving();
ballsInMotion -=1;
println("FirstBall down" + ballPos);
} else {
b.invertMoving();
ballsInMotion -=1;
PVector p = new PVector(ballStartX,ballStartY);
b.setPos(p);
println("Next ball Down new P: " + p);
}
if(ballsInMotion == 0){
setUpNextRound = true;
}
}
if (ballPos.y < ballSize + blockSize){ //top
b.invertV("y");
ballPos.y = ballSize+blockSize;
println("ball " + b.getIndex() + " hit Top");
}
if (ballPos.x > width - ballSize/2){ //right
b.invertV("x");
ballPos.x = 2*width-ballSize-ballPos.x;
println("ball " + b.getIndex() + " hit right");
}
if (ballPos.x < ballSize/2){ //left
b.invertV("x");
ballPos.x = ballSize-ballPos.x;
println("ball " + b.getIndex() + " hit left");
}
for(blocks block : blocksCollection){
int blockHealth = block.getBlockHealth();
int blockX = block.getX();
int blockY = block.getY();
boolean hit = false;
if(blockHealth > 0){
// Bottom of the block Top of the Block
if(!hit && (blockBallCollision(blockX+blockSize/2, blockY+blockSize, blockSize-blockCournerSize, 0, ballPos.x-b.getV().x, ballPos.y-b.getV().y, 2*(ballSize)) || blockBallCollision(blockX+blockSize/2, blockY, blockSize-blockCournerSize, 0, ballPos.x-b.getV().x, ballPos.y-b.getV().y, 2*(ballSize)))) {
println("Block Collision Top/Bottom: " + block.getIndex() + " by Ball: " + b.getIndex());
b.invertV("y");
block.blockHit();
hit = true;
// Left of the block Right of the Block
} else if ( !hit && (blockBallCollision(blockX, blockY+blockSize/2, 0, blockSize-blockCournerSize, ballPos.x-b.getV().x, ballPos.y-b.getV().y, 2*(ballSize)) || blockBallCollision(blockX+blockSize, blockY+blockSize/2, 0, blockSize-blockCournerSize, ballPos.x-b.getV().x, ballPos.y-b.getV().y, 2*(ballSize)))){
println("Block Collision Left/Right: " + block.getIndex() + " by Ball: " + b.getIndex());
b.invertV("x");
block.blockHit();
hit = true;
}
}
}
b.movePosV();
drawBalls();
}
}
}
存储球对象：
public class balls{
private int index;
private PVector b = new PVector();
private PVector bV = new PVector();
private boolean moving, needMoving;
public balls(int Index, float X, float Y, boolean m, PVector ballV){
index = Index;
b.x = X;
b.y = Y;
moving = m;
bV = ballV;
}
public void movePosV(){
b.sub(bV);
}
public void invertV(String xy){
if(xy.equals("x")){
bV.x = -bV.x;
} else {
bV.y = -bV.y;
}
}
public void setPos(PVector newB){
b = newB;
}
public void setV(PVector newV){
bV = newV;
}
public boolean getNeedMoving(){
return needMoving;
}
public PVector getV(){
return bV;
}
public PVector getPos(){
return b;
}
public int getIndex(){
return index;
}
public boolean isMoving(){
return moving;
}
public void invertMoving(){
moving = !moving;
}
public void invertNeedMoving(){
needMoving = !needMoving;
}
}