宠物蛇的实现

这个宠物蛇会跟踪人的手指，并且能随着不断移动而长大。当然如果他得不到锻炼，也会随着时间的推移而不断缩小。其主界面如下：

菜单部分，它实现了根据程序状态显示菜单内容，代码如下：

@Override

public boolean onPrepareOptionsMenu(Menu menu) {

boolean bOpenInfo = mSnakeView.getInfoState();

MenuItem infoItem = menu.findItem(R.id.action_info);

infoItem.setTitle(bOpenInfo ? R.string.action_info_close : R.string.action_info_show);

return super.onPrepareOptionsMenu(menu);

}

宠物蛇活动部分，它会根据移动的方位来确定自己的走向。需要注意的是，蛇的起点也是在Canvas缩放中会改变的。这段代码如下，

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

float scale = getFactor();

int x = (int)(mSnakeCoor.x/scale);

int y = (int)(mSnakeCoor.y/scale);

Matrix matrix = new Matrix();

int degree = 0;

if( mNextCoor.y!=0 || mNextCoor.x !=0){

degree = (int) (Math.atan2(mNextCoor.y, mNextCoor.x) * 180.0 / Math.PI) - 90;

}

matrix.preRotate( degree, mBitmap.getWidth() / 2, mBitmap.getHeight() / 2);

matrix.postTranslate(x, y);

matrix.postScale(scale, scale);

canvas.drawBitmap(mBitmap, matrix, null);

matrix = null;

}

消息处理部分，它分两部分，一部分是定时移动宠物，另一部分是有按键或触摸是实时处理消息。前者代码为：

class SnakeHandler extends Handler {

@Override

public void handleMessage(Message msg) {

super.handleMessage(msg);

if ( msg.what == SNAKE_MSG ) {

Bundle data = msg.getData();

int x = data.getInt("x");

int y = data.getInt("y");

if ( x != 0 || y!= 0) {

setSnakeOffset(x, y);

float factor = getFactor();

if ((mSnakeCoor.x + x < 0) && x < 0 ||

(mBitmap.getWidth() * factor + mSnakeCoor.x + x > mScreen.widthPixels) && x > 0) {

data.putInt("x", -x);

}

if ((mSnakeCoor.y + y < 0) && y < 0 ||

(mBitmap.getHeight() * factor + mSnakeCoor.y + y > mScreen.heightPixels) && y > 0) {

data.putInt("y", -y);

}

mSnakeEnergy++;

Message newMsg = Message.obtain();

newMsg.what = SNAKE_MSG;

newMsg.setData(data);

mHandler.sendMessageDelayed(newMsg, 1000);

}

}

}

}

后者如按键处理的代码为：

@Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

Bundle data = new Bundle();

Message msg = Message.obtain();

int degree = 0;

int x = 0;

int y = 0;

switch( keyCode ){

case KeyEvent.KEYCODE_DPAD_UP:

Log.i(TAG, "key code:up");

x = 0;

y = -10;

break;

case KeyEvent.KEYCODE_DPAD_DOWN:

Log.i(TAG, "key code:down");

x = 0;

y = 10;

break;

case KeyEvent.KEYCODE_DPAD_LEFT:

Log.i(TAG, "key code:left");

x = -10;

y = 0;

break;

case KeyEvent.KEYCODE_DPAD_RIGHT:

Log.i(TAG, "key code:right");

x = 10;

y = 0;

break;

default:

break;

}

if ( x != 0 || y != 0 ) {

msg.what = SNAKE_MSG;

data.putInt("x", x);

data.putInt("y", y);

msg.setData(data);

mHandler.removeMessages(SNAKE_MSG);

mHandler.sendMessage(msg);

}

return true;

}

工程源代码：petsnake.rar

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网址: 宠物蛇的实现 https://www.mcbbbk.com/newsview650498.html