Androidx学习笔记（76）--- 撕衣服

来源：互联网发布：如何化行最简形矩阵编辑：程序博客网时间：2024/04/20 16:29

撕衣服

原理：把穿内衣和穿外衣的照片重叠显示，内衣照在下面，用户滑动屏幕时，触摸的是外衣照，把手指经过的像素都置为透明，内衣照就显示出来了

 iv.setOnTouchListener(new OnTouchListener() {    @Override    public boolean onTouch(View v, MotionEvent event) {        switch (event.getAction()) {        case MotionEvent.ACTION_MOVE:            int newX = (int) event.getX();            int newY = (int) event.getY();            //把指定的像素变成透明            copyBm.setPixel(newX, newY, Color.TRANSPARENT);            iv.setImageBitmap(copyBm);            break;        }        return true;    }});

每次只设置一个像素点太慢，以触摸的像素为圆心，半径为5画圆，圆内的像素全部置为透明

for (int i = -5; i < 6; i++) {    for (int j = -5; j < 6; j++) {        if(Math.sqrt(i * i + j * j) <= 5)            copyBm.setPixel(newX + i, newY + j, Color.TRANSPARENT);    }}

public class MainActivity extends Activity {
 
private Bitmap bmCopy;
private ImageView iv;
 
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Bitmap bmSrc = BitmapFactory.decodeResource(getResources(), R.drawable.awaiyi);
bmCopy = Bitmap.createBitmap(bmSrc.getWidth(), bmSrc.getHeight(), bmSrc.getConfig());
Paint paint = new Paint();
Canvas canvas = new Canvas(bmCopy);
canvas.drawBitmap(bmSrc, new Matrix(), paint);
iv = (ImageView) findViewById(R.id.iv);
iv.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
int x = (int) event.getX();
int y = (int) event.getY();
for(int i = -5; i <= 5; i++){
for(int j = -5; j <= 5; j++){
//把用户划过的坐标置为透明色
//改变指定的像素颜色
if(Math.sqrt(i*i + j*j) <= 5){
if(x + i < bmCopy.getWidth() && y + j < bmCopy.getHeight() && x + i >= 0 && y + j >= 0){
bmCopy.setPixel(x + i, y + j, Color.TRANSPARENT);
iv.setImageBitmap(bmCopy);
}
}
}
}
break;
 
}
return true;
}
});
}
 
 
}

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