我现在正在编写一个 Android 游戏，我需要一些帮助来解决屏幕上墙壁的碰撞问题。当我在顶部和右侧拖动球时，它能够与墙壁发生碰撞，但是当我更快地拖动它时，它能够在墙壁上重叠
public boolean onTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
switch (event.getAction()) {
// if the player moves
case MotionEvent.ACTION_MOVE: {
if (playerTouchRect.contains(x, y)) {
boolean left = false;
boolean right = false;
boolean up = false;
boolean down = false;
boolean canMove = false;
boolean foundFinish = false;
if (x != pLastXPos) {
if (x < pLastXPos) {
left = true;
} else {
right = true;
}
pLastXPos = x;
}
if (y != pLastYPos) {
if (y < pLastYPos) {
up = true;
} else {
down = true;
}
pLastYPos = y;
}
plCellRect = getRectFromPos(x, y);
newplRect.set(playerRect);
newplRect.left = x - (int) (playerRect.width() / 2);
newplRect.right = x + (int) (playerRect.width() / 2);
newplRect.top = y - (int) (playerRect.height() / 2);
newplRect.bottom = y + (int) (playerRect.height() / 2);
int currentRow = 0;
int currentCol = 0;
currentRow = getRowFromYPos(newplRect.top);
currentCol = getColFromXPos(newplRect.right);
if(!canMove){
canMove = mapManager.getCurrentTile().pMaze[currentRow][currentCol] == Cell.wall;
canMove =true;
}
finishTest = mapManager.getCurrentTile().pMaze[currentRow][currentCol];
foundA = finishTest == Cell.valueOf(letterNotGet + "");
canMove = mapManager.getCurrentTile().pMaze[currentRow][currentCol] != Cell.wall;
canMove = (finishTest == Cell.floor || finishTest == Cell.pl) && canMove;
if (canMove) {
invalidate();
setTitle();
}
if (foundA) {
mapManager.getCurrentTile().pMaze[currentRow][currentCol] = Cell.floor;
// finishTest
letterGotten.add(letterNotGet);
playCurrentLetter();
/*sounds.play(sExplosion, 1.0f, 1.0f, 0, 0, 1.5f);*/
foundS = letterNotGet == 's';
letterNotGet++;
}if(foundS){
AlertDialog.Builder builder = new AlertDialog.Builder(mainActivity);
builder.setTitle(mainActivity.getText(R.string.finished_title));
LayoutInflater inflater = mainActivity.getLayoutInflater();
View view = inflater.inflate(R.layout.finish, null);
builder.setView(view);
View closeButton =view.findViewById(R.id.closeGame);
closeButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View clicked) {
if(clicked.getId() == R.id.closeGame) {
mainActivity.finish();
}
}
});
AlertDialog finishDialog = builder.create();
finishDialog.show();
}
else {
Log.d(TAG, "INFO: updated player position");
playerRect.set(newplRect);
setTouchZone();
updatePlayerCell();
}
} // end of (CASE) if playerTouch
break;
} // end of (SWITCH) Case motion
}//end of Switch
return true;
}//end of TouchEvent
private void finish() {
// TODO Auto-generated method stub
}
public int getColFromXPos(int xPos) {
val = xPos / (pvWidth / mapManager.getCurrentTile().pCols);
if (val == mapManager.getCurrentTile().pCols) {
val = mapManager.getCurrentTile().pCols - 1;
}
return val;
}
/**
* Given a y pixel position, return the row of the cell it is in This is
* used when determining the type of adjacent Cells.
*
* @param yPos
* y position in pixels
* @return The cell this position is in
*/
public int getRowFromYPos(int yPos) {
val = yPos / (pvHeight / mapManager.getCurrentTile().pRows);
if (val == mapManager.getCurrentTile().pRows) {
val = mapManager.getCurrentTile().pRows - 1;
}
return val;
}
/**
* When preserving the position we need to know which cell the player is in,
* so calculate it from the centre on its Rect
*/
public void updatePlayerCell() {
plCell.x = (playerRect.left + (playerRect.width() / 2))
/ (pvWidth / mapManager.getCurrentTile().pCols);
plCell.y = (playerRect.top + (playerRect.height() / 2))
/ (pvHeight / mapManager.getCurrentTile().pRows);
if (mapManager.getCurrentTile().pMaze[plCell.y][plCell.x] == Cell.floor) {
for (int row = 0; row < mapManager.getCurrentTile().pRows; row++) {
for (int col = 0; col < mapManager.getCurrentTile().pCols; col++) {
if (mapManager.getCurrentTile().pMaze[row][col] == Cell.pl) {
mapManager.getCurrentTile().pMaze[row][col] = Cell.floor;
break;
}
}
}
mapManager.getCurrentTile().pMaze[plCell.y][plCell.x] = Cell.pl;
}
}
public Rect getRectFromPos(int x, int y) {
calcCell.left = ((x / cellWidth) + 0) * cellWidth;
calcCell.right = calcCell.left + cellWidth;
calcCell.top = ((y / cellHeight) + 0) * cellHeight;
calcCell.bottom = calcCell.top + cellHeight;
Log.d(TAG, "Rect: " + calcCell + " Player: " + playerRect);
return calcCell;
}
public void setPlayerRect(Rect newplRect) {
playerRect.set(newplRect);
}
private void setTouchZone() {
playerTouchRect.set(
playerRect.left - playerRect.width() / TOUCH_ZONE,
playerRect.top - playerRect.height() / TOUCH_ZONE,
playerRect.right + playerRect.width() / TOUCH_ZONE,
playerRect.bottom + playerRect.height() / TOUCH_ZONE);
}
public Rect getPlayerRect() {
return playerRect;
}
public Point getPlayerCell() {
return plCell;
}
public void setPlayerCell(Point cell) {
plCell = cell;
}
}*