StackOverflow2013

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plurals

PO
primarykey
Id
13795745
data
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0
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4
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2012-12-10T05:54:23.937
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2012-12-10T05:54:23.937
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text
Body
Change your code like this.... <pre><code>public MyView(Context context, Object object) { super(context); setFocusable(true); setFocusableInTouchMode(true); mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setColor(0xFFFFFF00); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStrokeWidth(3); mCanvas = new Canvas(); mPath = new Path(); mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888); mCanvas = new Canvas(mBitmap); selectedcolor=context.getResources().getColor(com.example.videoapp.R.color.red); } protected void onDraw(Canvas canvas) { canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); for (Path p : paths) { mPaint.setColor(colorsMap.get(p)); canvas.drawPath(p, mPaint); } mPaint.setColor(selectedcolor); canvas.drawPath(mPath, mPaint); } </code></pre> In ontouch event.. ACTION_DOWN: <pre><code>undonePaths.clear(); mPath.reset(); mPath.moveTo(x, y); mX = x; mY = y; invalidate(); </code></pre> ACTION_MOVE: <pre><code>float dx = Math.abs(x - mX); float dy = Math.abs(y - mY); if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2); mX = x; mY = y; } invalidate(); </code></pre> ACTION_UP: <pre><code>mPath.lineTo(mX, mY); paths.add(mPath); colorsMap.put(mPath,selectedcolor); mPath = new Path(); mPath.reset(); invalidate(); </code></pre> Dont put this paths.add(mPath) in context and oncreate also... <pre><code> public MyView(Context context, Object object) { super(context); // paths.add(mPath); // Dont put this line... } </code></pre> Undo and Redo.... <pre><code> undo.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { if(MyView.paths.size()> 0) { MyView.undonePaths.add(MyView.paths.remove(MyView.paths.size() - 1)); mview.invalidate(); } } }); redo.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { if (MyView.undonePaths.size()>0) { MyView.paths.add(MyView.undonePaths.remove(MyView.undonePaths.size()-1)); mview.invalidate(); } } }); </code></pre> I hope this code is really veryuseful to u.. all the best
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Title
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1. This table or related slice is empty.
PostParentId
1. POHow to perform Undo and Redo operation on canvas in android
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PostTypePostTypeId
1. PTAnswer
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1. This table or related slice is empty.
UserOwnerUserId
1. USKevin Rameshwaran
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1. This table or related slice is empty.
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1. VO
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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