我有一个用于擦除背景的应用程序,我使用了一个搜索栏来改变橡皮擦的大小。但是当我改变SeekBar的进度时,之前的路径发生了变化。 我想更改路径大小而不更改以前的路径
主要活动
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.image_overlay_bitmap);
scratchView = (WScratchView) findViewById(R.id.scratch_view);
global = ((Global) getApplicationContext());
scratchView.setRevealSize(1);
SeekBar seekbar = (SeekBar) findViewById(R.id.myseek);
seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
scratchView.setRevealSize(progress);
}
});
if (getIntent().getExtras().getBoolean("isFromCrop")) {
Log.i("width", "" + global.getBitmap().getWidth());
Log.i("height", "" + global.getBitmap().getHeight());
// set bitmap to scratchview
// Bitmap bitmap =
// BitmapFactory.decodeResource(getResources(),R.drawable.test);
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
/*
* int height = displaymetrics.heightPixels; int width =
* displaymetrics.widthPixels;
*/
int height = global.getBitmap().getHeight();
int width = global.getBitmap().getWidth();
Bitmap scaledBitmap = Bitmap.createBitmap(width, height,
Config.ARGB_8888);
float ratioX = width / (float) global.getBitmap().getWidth();
float ratioY = height / (float) global.getBitmap().getHeight();
float middleX = width / 2.0f;
float middleY = height / 2.0f;
Matrix scaleMatrix = new Matrix();
scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);
Canvas canvas = new Canvas(scaledBitmap);
canvas.setMatrix(scaleMatrix);
canvas.drawBitmap(global.getBitmap(), middleX
- global.getBitmap().getWidth() / 2, middleY
- global.getBitmap().getHeight() / 2, new Paint(
Paint.FILTER_BITMAP_FLAG));
i = seekbar.getProgress();
scratchView.setRevealSize(i);
} else {
SharedPreferences settings = getApplicationContext()
.getSharedPreferences("pref", 0);
settings = getApplicationContext().getSharedPreferences("pref", 0);
String picture = settings.getString("file_path", "");
Bitmap mbitmap = BitmapFactory.decodeFile(picture);
scratchView.setScratchBitmap(mbitmap);
}
/*
* scratchView.setScratchBitmap(getResizedBitmap(global.getBitmap(),
* width, height));
*/
// scratchView.setOverlayColor(1);
//i = seekbar.getProgress();
// seekbar.setMax(100);
}
public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {
int width = bm.getWidth();
int height = bm.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Log.i("scalewidth", "" + scaleWidth);
Log.i("scaleheight", "" + scaleHeight);
// CREATE A MATRIX FOR THE MANIPULATION
Matrix matrix = new Matrix();
// RESIZE THE BIT MAP
matrix.postScale(scaleWidth, scaleHeight);
// RECREATE THE NEW BITMAP
Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height,
matrix, false);
return resizedBitmap;
}
private File captureImage() {
// TODO Auto-generated method stub
OutputStream output;
Calendar cal = Calendar.getInstance();
Bitmap bitmap = Bitmap.createBitmap(scratchView.getWidth(),
scratchView.getHeight(), Config.ARGB_8888);
bitmap = ThumbnailUtils.extractThumbnail(bitmap,
scratchView.getWidth(), scratchView.getHeight());
Canvas b = new Canvas(bitmap);
scratchView.draw(b);
// Find the SD Card path
File filepath = Environment.getExternalStorageDirectory();
// Create a new folder in SD Card
File dir = new File(filepath.getAbsolutePath() + "/demotemp/");
dir.mkdirs();
mImagename = "imageTemp" + ".png";
// Create a name for the saved image
file = new File(dir, mImagename);
// Show a toast message on successful save
Toast.makeText(ImageOverlayBitmap.this, "Image Saved to SD Card",
Toast.LENGTH_SHORT).show();
try {
output = new FileOutputStream(file);
// Compress into png format image from 0% - 100%
bitmap.compress(Bitmap.CompressFormat.PNG, 100, output);
output.flush();
output.close();
}
catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return file;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public void onClickHandler(View view) {
switch (view.getId()) {
case R.id.reset_button:
captureImage();
SharedPreferences settings = getApplicationContext()
.getSharedPreferences("pref", 0);
settings = getApplicationContext().getSharedPreferences("pref", 0);
SharedPreferences.Editor editor = settings.edit();
editor.putString("file_path", file.getPath());
editor.commit();
Intent i = new Intent(ImageOverlayBitmap.this,
SelectedImgActivity.class);
global.setfile_path(file.getPath());
i.putExtra("isBackgroundSet", false);
startActivity(i);
finish();
// scratchView.resetView();
break;
}
} }
绘制活动
public WScratchView(Context ctx, AttributeSet attrs) {
super(ctx, attrs);
init(ctx, attrs);
}
public WScratchView(Context context) {
super(context);
init(context, null);
}
private void init(Context context, AttributeSet attrs) {
mContext = context;
// default value
mOverlayColor = DEFAULT_COLOR;
mRevealSize = DEFAULT_REVEAL_SIZE;
setZOrderOnTop(true);
SurfaceHolder holder = getHolder();
holder.addCallback(this);
holder.setFormat(PixelFormat.TRANSPARENT);
mOverlayPaint = new Paint();
mOverlayPaint.setXfermode(new PorterDuffXfermode(Mode.CLEAR));
mOverlayPaint.setStyle(Paint.Style.STROKE);
mOverlayPaint.setStrokeCap(Paint.Cap.ROUND);
mOverlayPaint.setStrokeJoin(Paint.Join.ROUND);
// convert drawable to bitmap if drawable already set in xml
if (mScratchDrawable != null) {
mScratchBitmap = ((BitmapDrawable) mScratchDrawable).getBitmap();
}
mBitmapPaint = new Paint();
mBitmapPaint.setAntiAlias(true);
mBitmapPaint.setFilterBitmap(true);
mBitmapPaint.setDither(true);
}
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mScratchBitmap != null) {
if (mMatrix == null) {
float scaleWidth = (float) canvas.getWidth() / mScratchBitmap.getWidth();
float scaleHeight = (float) canvas.getHeight() / mScratchBitmap.getHeight();
mMatrix = new Matrix();
mMatrix.postScale(scaleWidth, scaleHeight);
}
canvas.drawBitmap(mScratchBitmap, mMatrix, mBitmapPaint);
} else {
canvas.drawColor(mOverlayColor);
}
for (Path path : mPathList) {
mOverlayPaint.setAntiAlias(mIsAntiAlias);
mOverlayPaint.setStrokeWidth(mRevealSize);
canvas.drawPath(path, mOverlayPaint);
}
}
private void updateScratchedPercentage() {
if(mOnScratchCallback == null) return;
mOnScratchCallback.onScratch(getScratchedRatio());
}
@Override
public boolean onTouchEvent(MotionEvent me) {
synchronized (mThread.getSurfaceHolder()) {
if (!mIsScratchable) {
return true;
}
switch (me.getAction()) {
case MotionEvent.ACTION_DOWN:
path = new Path();
path.moveTo(me.getX(), me.getY());
startX = me.getX();
startY = me.getY();
mPathList.add(path);
break;
case MotionEvent.ACTION_MOVE:
//if (mScratchStart) {
if (path.isEmpty()) {
path.lineTo(me.getX(), me.getY());
} else {
if (isScratch(startX, me.getX(), startY, me.getY())) {
mScratchStart = true;
}
updateScratchedPercentage();
break;
case MotionEvent.ACTION_UP:
mPathList.add(path);
// mScratchStart = false;
break;
}
return true;
}
}
private boolean isScratch(float oldX, float x, float oldY, float y) {
float distance = (float) Math.sqrt(Math.pow(oldX - x, 2) + Math.pow(oldY - y, 2));
if (distance > mRevealSize * 2) {
return true;
} else {
return false;
}
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
// do nothing
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mScratchedTestBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mScratchedTestCanvas = new Canvas(mScratchedTestBitmap);
}
@Override
public void surfaceCreated(SurfaceHolder arg0) {
mThread = new WScratchViewThread(getHolder(), this);
mThread.setRunning(true);
mThread.start();
mScratchedTestBitmap = Bitmap.createBitmap(arg0.getSurfaceFrame().width(), arg0.getSurfaceFrame().height(), Bitmap.Config.ARGB_8888);
mScratchedTestCanvas = new Canvas(mScratchedTestBitmap);
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
boolean retry = true;
mThread.setRunning(false);
while (retry) {
try {
mThread.join();
retry = false;
} catch (InterruptedException e) {
// do nothing but keep retry
}
}
}
class WScratchViewThread extends Thread {
private SurfaceHolder mSurfaceHolder;
private WScratchView mView;
private boolean mRun = false;
public WScratchViewThread(SurfaceHolder surfaceHolder, WScratchView view) {
mSurfaceHolder = surfaceHolder;
mView = view;
}
public void setRunning(boolean run) {
mRun = run;
}
public SurfaceHolder getSurfaceHolder() {
return mSurfaceHolder;
}
@Override
public void run() {
Canvas c;
while (mRun) {
c = null;
try {
c = mSurfaceHolder.lockCanvas(null);
synchronized (mSurfaceHolder) {
if (c != null) {
mView.draw(c);
}
}
} finally {
if (c != null) {
mSurfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
@Override
public void resetView() {
synchronized (mThread.getSurfaceHolder()) {
mPathList.clear();
}
}
@Override
public boolean isScratchable() {
return mIsScratchable;
}
@Override
public void setScratchable(boolean flag) {
mIsScratchable = flag;
}
@Override
public void setOverlayColor(int ResId) {
mOverlayColor = ResId;
}
@Override
public void setRevealSize(int size) {
Canvas canvas = new Canvas();
//mScratchedTestBitmap = Bitmap.createBitmap(mScratchedTestBitmap.getWidth(), mScratchedTestBitmap.getWidth(), Bitmap.Config.ARGB_8888);
//mScratchedTestCanvas = new Canvas(mScratchedTestBitmap);
canvas.drawBitmap(mScratchBitmap,mMatrix, mBitmapPaint);
mRevealSize = size;
}
@Override
public void setAntiAlias(boolean flag) {
mIsAntiAlias = flag;
}
@Override
public void setScratchDrawable(Drawable d) {
mScratchDrawable = d;
if (mScratchDrawable != null) {
mScratchBitmap = ((BitmapDrawable) mScratchDrawable).getBitmap();
}
}
@Override
public void setScratchBitmap(Bitmap b) {
mScratchBitmap = b;
}
@Override
public float getScratchedRatio() {
return getScratchedRatio(DEFAULT_SCRATCH_TEST_SPEED);
}
/**
* thanks to https://github.com/daveyfong for providing this method
*/
@Override
public float getScratchedRatio(int speed) {
if (null == mScratchedTestBitmap) {
return 0;
}
draw(mScratchedTestCanvas);
final int width = mScratchedTestBitmap.getWidth();
final int height = mScratchedTestBitmap.getHeight();
int count = 0;
for (int i = 0; i < width; i += speed) {
for (int j = 0; j < height; j += speed) {
if (0 == Color.alpha(mScratchedTestBitmap.getPixel(i, j))) {
count++;
}
}
}
float completed = (float) count / ((width / speed) * (height / speed)) * 100;
return completed;
}
public void setOnScratchCallback(OnScratchCallback callback) {
mOnScratchCallback = callback;
}
public static abstract class OnScratchCallback{
public abstract void onScratch(float percentage);
}
@Override
public void setScratchAll(boolean scratchAll) {
// TODO Auto-generated method stub
}
@Override
public void setBackgroundClickable(boolean clickable) {
// TODO Auto-generated method stub
} }
答案 0 :(得分:0)
我注意到,在onDraw()
例程中,您将每个路径的笔触宽度设置为mRevealSize
。此外,此mRevealSize
是由SeekBar
更改的内容。
我认为您需要做的是每次用户做出擦除路径时捕获笔划宽度mRevealSize
,并将该笔划宽度存储在补充mPathList
的列表中。那么您的onDraw()
就会:
for (int i = 0; i < mPathList.size(); i++) {
mOverlayPaint.setAntiAlias(mIsAntiAlias);
mOverlayPaint.setStrokeWidth(mStrokeList.get(i));
canvas.drawPath(mPathList.get(i), mOverlayPaint);
}