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POGetting all points in Path in android - FingerPaint.java
 

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  1. POGetting all points in Path in android - FingerPaint.java
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    <p>I tried to get all the x,y coordinates that are drawn in the path on the canvas. But i couldn't get the points. I am getting only a few points. Why is that?</p> <p>Is there any way i can get all the x and y points?</p> <p>I use FingerPaint.java as a starting point.</p> <p><a href="http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/FingerPaint.html" rel="nofollow">Link to Original FingerPaint.java</a></p> <p>Here is the code i modified and using:</p> <pre><code>package com.schogini.whiteboard; import java.util.ArrayList; import java.util.StringTokenizer; import android.app.Activity; import android.content.Context; import android.graphics.*; import android.os.Bundle; import android.util.DisplayMetrics; import android.util.Log; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; //import android.widget.Toast; public class FingerPaint extends Activity implements ColorPickerDialog.OnColorChangedListener { //color - ARGB int a = 255; int r = 255; int g = 0; int b = 0; //erase Flag boolean eraseFlag=false; //Internet Posting static String toSend; static String parseStr; //array for storing x,y,r,g,b,a static ArrayList&lt;String&gt; rArray,gArray,bArray,alphaArray,xPointArray,yPointArray; //ArrayList&lt;String&gt; rArray_in,gArray_in,bArray_in,alphaArray_in,xPointArray_in,yPointArray_in; //Drawing types private static Paint mPaint; private MaskFilter mEmboss; private MaskFilter mBlur; //touch - Path Coordinates private static float mX; private static float mY; //MyView object MyView m; //point populate float dx,dy,distance; int dd,ii; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); m = new MyView(FingerPaint.this); setContentView(m); //move to appropriate module rArray = new ArrayList&lt;String&gt;(); gArray = new ArrayList&lt;String&gt;(); bArray = new ArrayList&lt;String&gt;(); alphaArray = new ArrayList&lt;String&gt;(); xPointArray = new ArrayList&lt;String&gt;(); yPointArray = new ArrayList&lt;String&gt;(); mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setDither(true); mPaint.setColor(0xFFFF0000); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeCap(Paint.Cap.ROUND); //width of the drawing brush mPaint.setStrokeWidth(12); mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 }, 0.4f, 6, 3.5f); mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL); } public void parsing(String str22){ //example string received from server // parseStr = "255,0,0,1.0,88.0,100.0||255,0,0,1.0,88.0,101.0||255,0,0,1.0,88.0,102.0||255,0,0,1.0,88.0,103.0||255,0,0,1.0,88.0,104.0||255,0,0,1.0,88.0,105.0||255,0,0,1.0,88.0,106.0||255,0,0,1.0,88.0,107.0||255,0,0,1.0,88.0,108.0," + // "||255,0,0,1.0,88.0,109.0||255,0,0,1.0,88.0,110.0||255,0,0,1.0,88.0,111.0||255,0,0,1.0,88.0,112.0||255,0,0,1.0,88.0,113.0||255,0,0,1.0,88.0,114.0||255,0,0,1.0,88.0,115.0||255,0,0,1.0,88.0,116.0||255,0,0,1.0,88.0,117.0," + // "||255,0,0,1.0,88.0,118.0||255,0,0,1.0,88.0,119.0||255,0,0,1.0,88.0,120.0||255,0,0,1.0,80.0,100.0||255,0,0,1.0,81.0,100.0||255,0,0,1.0,82.0,100.0||255,0,0,1.0,83.0,100.0||255,0,0,1.0,84.0,100.0||255,0,0,1.0,85.0,100.0," + // "||255,0,0,1.0,86.0,100.0||255,0,0,1.0,87.0,100.0||255,0,0,1.0,88.0,100.0||255,0,0,1.0,89.0,100.0||255,0,0,1.0,91.0,100.0||255,0,0,1.0,92.0,100.0||255,0,0,1.0,93.0,100.0||255,0,0,1.0,94.0,100.0||255,0,0,1.0,95.0,100.0," + // "||255,0,0,1.0,96.0,100.0||255,0,0,1.0,97.0,100.0||255,0,0,1.0,98.0,100.0||255,0,0,1.0,99.0,100.0||255,0,0,1.0,100.0,100.0||255,0,0,1.0,101.0,100.0||255,0,0,1.0,102.0,100.0||255,0,0,1.0,103.0,100.0,"; parseStr="255,0,0,255,85.351585,90.17996||255,0,0,255,85.351585,90.17996||255,0,0,255,123.97784,80.883064||255,0,0,255,164.47311,71.58616||255,0,0,255,182.22874,65.543175||255,0,0,255,233.9381,48.3439||255,0,0,255,247.95567,42.30091||255,0,0,255,252.62822,40.441532||255,0,0,255,252.62822,40.441532||255,0,0,255,86.9091,167.34427||255,0,0,255,86.9091,167.34427||255,0,0,255,86.9091,167.34427||255,0,0,255,151.70154,133.41057||255,0,0,255,190.3278,118.07068||255,0,0,255,235.18411,98.54717||255,0,0,255,248.57867,92.03935||255,0,0,255,256.36627,89.71512||255,0,0,255,257.30078,89.250275||255,0,0,255,257.30078,89.250275||255,0,0,255,82.548065,277.97742||255,0,0,255,82.548065,277.97742||255,0,0,255,82.548065,277.97742||255,0,0,255,116.50179,258.91876||255,0,0,255,152.63605,240.7898||255,0,0,255,209.95244,215.68816||255,0,0,255,239.23363,199.41858||255,0,0,255,249.8247,192.4459||255,0,0,255,261.35028,186.86777||255,0,0,255,261.9733,186.86777||255,0,0,255,261.9733,186.86777||255,0,0,255,50.77485,53.92204||255,0,0,255,50.77485,53.92204||255,0,0,255,50.77485,53.92204||255,0,0,255,50.77485,53.92204||255,0,0,255,48.905834,62.7541||255,0,0,255,39.56077,133.87541||255,0,0,255,44.856304,185.93808||255,0,0,255,53.578365,266.82114||255,0,0,255,53.578365,287.27435||255,0,0,255,51.70935,301.6845||255,0,0,255,51.39785,303.07904||255,0,0,255,51.086346,303.5439||255,0,0,255,51.086346,303.5439||255,0,0,255,90.02411,362.57922||255,0,0,255,88.155106,355.14172||255,0,0,255,109.02575,317.0244||255,0,0,255,133.01141,323.53226||255,0,0,255,155.43958,340.26666||255,0,0,255,166.65363,344.91513||255,0,0,255,185.03226,338.4073||255,0,0,255,193.13133,326.78616||255,0,0,255,210.26395,292.38763||255,0,0,255,228.01956,296.10638||255,0,0,255,259.7928,283.09073||255,0,0,255,266.33432,263.5672||255,0,0,255,267.58032,258.91876||255,0,0,255,269.76086,256.1297||255,0,0,255,271.94138,255.20001||255,0,0,255,284.71295,248.22733||255,0,0,255,294.3695,232.42259||255,0,0,255,297.48453,212.8991||255,0,0,255,297.48453,212.8991||255,0,0,255,101.86119,202.67252||255,0,0,255,101.86119,202.67252||255,0,0,255,101.86119,202.67252||255,0,0,255,113.07527,194.77013||255,0,0,255,141.73346,178.9654||255,0,0,255,144.8485,179.43024||255,0,0,255,166.96513,192.4459||255,0,0,255,170.70317,195.23497||255,0,0,255,193.75432,195.69983||255,0,0,255,201.85338,185.93808||255,0,0,255,212.75597,146.42624||255,0,0,255,217.4285,136.19965||255,0,0,255,231.44609,135.26996||255,0,0,255,241.41415,136.66449||255,0,0,255,250.13622,136.19965||255,0,0,255,279.41742,128.76212||255,0,0,255,312.12512,100.406555||255,0,0,255,312.12512,100.406555||255,0,0,255,92.20462,52.527508||255,0,0,255,92.20462,52.527508||255,0,0,255,159.48909,44.160294||255,0,0,255,186.90128,34.398544||255,0,0,255,242.97165,20.918034||255,0,0,255,269.13785,13.48051||255,0,0,255,288.76245,11.62113||255,0,0,255,288.76245,11.62113,"; StringTokenizer tokens = new StringTokenizer(parseStr, "||"); while(tokens.hasMoreTokens()) { String second = tokens.nextToken(); StringTokenizer tempTokens = new StringTokenizer(second, ","); int index = 0; while(tempTokens.hasMoreTokens()) { String splitStr = tempTokens.nextToken(); switch (index%6) { case 0: rArray.add(splitStr); break; case 1: gArray.add(splitStr); break; case 2: bArray.add(splitStr); break; case 3: alphaArray.add(splitStr); break; case 4: xPointArray.add(splitStr); break; case 5: yPointArray.add(splitStr); break; default: break; } index++; Log.v("String44"," value = "+splitStr); } } m.redraw(); } public void colorChanged(int color) { mPaint.setColor(color); //method to convert integer color to r g b a b = (color)&amp;0xFF; g = (color&gt;&gt;8)&amp;0xFF; r = (color&gt;&gt;16)&amp;0xFF; a = Math.round(((color&gt;&gt;&gt;24)/255)*10); } public class MyView extends View { private Bitmap mBitmap; private Canvas mCanvas; public Path mPath; public Paint mBitmapPaint; public MyView(Context c) { super(c); // reading screen size (for device Independence) DisplayMetrics displaymetrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(displaymetrics); mBitmap = Bitmap.createBitmap(displaymetrics.widthPixels,displaymetrics.heightPixels, Bitmap.Config.ARGB_8888); mCanvas = new Canvas(mBitmap); mPath = new Path(); mBitmapPaint = new Paint(Paint.DITHER_FLAG); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); } @Override protected void onDraw(Canvas canvas) { //background -- White canvas.drawColor(0xFFFFFFFF); //draw the bitmap from 0,0 the firstpoint in device's screen canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); canvas.drawPath(mPath, mPaint); } public void touch_start(float x, float y) { //reset touch so that a new path is to be drawn mPath.reset(); mPath.moveTo(x, y); mX = x; mY = y; } public void touch_move(float x, float y) { mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2); //point tracing tracePoints((int)x, (int)y,(int)mX,(int)mY); mX = x; mY = y; } public void touch_up() { mPath.lineTo(mX, mY); // commit the path to our offscreen mCanvas.drawPath(mPath, mPaint); // kill this so we don't double draw mPath.reset(); } public void arrayPopulate(float atx,float aty){ if(eraseFlag==false){ //entering points into arrayLists xPointArray.add(""+atx); yPointArray.add(""+aty); //add color as well alphaArray.add(""+a); rArray.add(""+r); gArray.add(""+g); bArray.add(""+b); // if(toSend==null){ // toSend=""+r+","+g+","+b+","+a+","+atx+","+aty+"||"; // } // else{ // toSend+=""+r+","+g+","+b+","+a+","+atx+","+aty+"||"; // } //add data to a queue for sending to server // Log.v("touch", toSend); //send data here to server //eraseFlag is true ends } } @Override public boolean onTouchEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: touch_start(x, y); arrayPopulate(x, y); invalidate(); break; case MotionEvent.ACTION_MOVE: touch_move(x, y); invalidate(); break; case MotionEvent.ACTION_UP: touch_up(); arrayPopulate(x, y); invalidate(); break; } return true; } public void redraw() { int arraysize = FingerPaint.rArray.size(); int index=0; float xx,yy; //setting properties of tPaint Paint tPaint= new Paint(); tPaint.setAntiAlias(true); tPaint.setDither(true); tPaint.setStyle(Paint.Style.STROKE); tPaint.setStrokeJoin(Paint.Join.ROUND); tPaint.setStrokeCap(Paint.Cap.ROUND); tPaint.setColor(-16777216); tPaint.setStrokeWidth(12); while(index&lt;arraysize){ //tPaint.setARGB(Integer.parseInt(alphaArray.get(0)), Integer.parseInt(rArray.get(0)), Integer.parseInt(gArray.get(0)), Integer.parseInt(bArray.get(0))); //tPaint.setColor(Color.argb(Integer.parseInt(alphaArray.get(0)), Integer.parseInt(rArray.get(0)), Integer.parseInt(gArray.get(0)), Integer.parseInt(bArray.get(0)))); xx=Float.parseFloat(xPointArray.get(index)); yy=Float.parseFloat(yPointArray.get(index)); m.mCanvas.drawPoint(xx,yy,tPaint); m.invalidate(); index++; Log.d("__REDRAW__", "X="+xx+" Y="+yy); } } } //creating Options Menu - Inflater @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu, menu); return true; } //Option Menu Selection - Actions @Override public boolean onOptionsItemSelected(MenuItem item) { mPaint.setXfermode(null); mPaint.setAlpha(255); switch (item.getItemId()) { case R.id.COLOR: this.eraseFlag=false; new ColorPickerDialog(this, this, mPaint.getColor()).show(); return true; case R.id.EMBOSS: this.eraseFlag=false; if (mPaint.getMaskFilter() != mEmboss) { mPaint.setMaskFilter(mEmboss); } else { mPaint.setMaskFilter(null); } return true; case R.id.BLUR: this.eraseFlag=false; if (mPaint.getMaskFilter() != mBlur) { mPaint.setMaskFilter(mBlur); } else { mPaint.setMaskFilter(null); } return true; case R.id.ERASE: //for toggle detection this.eraseFlag=true; //reset blurr &amp; Emboss mPaint.setMaskFilter(null); mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR)); return true; case R.id.REDRAW: this.eraseFlag=false; //redraw the drawn points m.redraw(); return true; } return super.onOptionsItemSelected(item); } //Bressenham's mid-point algorithm for finding all points between any two points --- Straight line public void tracePoints(int xxx,int yyy,int x2, int y2) { int w = x2 - xxx ; int h = y2 - yyy ; int dx1 = 0, dy1 = 0, dx2 = 0, dy2 = 0 ; if (w&lt;0) dx1 = -1 ; else if (w&gt;0) dx1 = 1 ; if (h&lt;0) dy1 = -1 ; else if (h&gt;0) dy1 = 1 ; if (w&lt;0) dx2 = -1 ; else if (w&gt;0) dx2 = 1 ; int longest = Math.abs(w) ; int shortest = Math.abs(h) ; if (!(longest&gt;shortest)) { longest = Math.abs(h) ; shortest = Math.abs(w) ; if (h&lt;0) dy2 = -1 ; else if (h&gt;0) dy2 = 1 ; dx2 = 0 ; } int numerator = longest &gt;&gt; 1 ; for (int i=0;i&lt;=longest;i++) { m.arrayPopulate((float)xxx,(float)yyy) ; numerator += shortest ; if (!(numerator&lt;longest)) { numerator -= longest ; xxx += dx1 ; yyy += dy1 ; } else { xxx += dx2 ; yyy += dy2 ; } } } } </code></pre>
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    1. COif i draw slowly i am getting all the points....
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      1. POGetting all points in Path in android - FingerPaint.java
      1. USAnoop CH
    2. COOne possible solution is using quadratic beizer curve(this is what the quadTo() does). But it is super-slow even on a real device. Any suggestion on this.
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      1. USAnoop CH
    3. COUpon going through the source of quadTo().. It is done by a native method call...
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