Develop Reference

PorterDuff.Mode.CLEAR draws black on canvas

I want to implement eraser in my paint app. But the code
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
draws black line on canvas. If I am changing the background color the canvas draws black on it too.
I have also tried using setLayerType() but it draws white on any color background.
// In constructor
setLayerType(View.LAYER_TYPE_SOFTWARE, null);
Below is the code for my PaintView.
public class PaintView extends View {
private Bitmap bitmapBackground,bitmapView;
private int backgroundColor;
private int brushSize;
private int eraserSize;
private float mX,mY;
private Canvas canvas=null;
private final int TOUCH_TOLERANCE=4;
private int paintColor;
private int modeStatus;
/*
1 for brush
2 for eraser
*/
private ArrayList<Paint> paints = new ArrayList<>();
private ArrayList<Path> paths = new ArrayList<>();
private int historyPointer=0;
public PaintView(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
initialise();
}
private void initialise() {
eraserSize=12;
brushSize=12;
backgroundColor= Color.WHITE;
paintColor = Color.BLACK;
modeStatus = 1;
paints.add(createPaint());
paths.add(new Path());
historyPointer++;
}
private float toPx(int brushSize) {
return brushSize*(getResources().getDisplayMetrics().density);
}
public void init(int width,int height) {
bitmapBackground=Bitmap.createBitmap(width,height, Bitmap.Config.ARGB_8888);
bitmapView=Bitmap.createBitmap(width,height, Bitmap.Config.ARGB_8888);
canvas=new Canvas(bitmapView);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(backgroundColor);
canvas.drawBitmap(bitmapBackground,0,0,null);
for (int i=0;i<historyPointer;i++) {
Path path = paths.get(i);
Paint paint = paints.get(i);
canvas.drawPath(path,paint);
}
}
private Paint createPaint() {
Paint paint = new Paint();
paint.setColor(paintColor);
paint.setAntiAlias(true);
paint.setDither(true);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeCap(Paint.Cap.ROUND);
paint.setStrokeJoin(Paint.Join.ROUND);
if (modeStatus==1) {
paint.setXfermode(null);
paint.setShader(null);
paint.setMaskFilter(null);
paint.setStrokeWidth(toPx(brushSize));
}
else {
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
paint.setStrokeWidth(toPx(eraserSize));
}
return paint;
}
private Path createPath(float x,float y) {
Path path = new Path();
path.moveTo(x,y);
return path;
}
public void setBackgroundColor(int backgroundColor) {
this.backgroundColor=backgroundColor;
invalidate(); //Redraw
}
public void setBrushSize(int brushSize) {
this.brushSize=brushSize;
modeStatus=1;
}
public void setBrushColor(int color) {
paintColor=color;
}
public void setEraserSize(int eraserSize) {
this.eraserSize=eraserSize;
modeStatus=2;
}
public int getBrushSize() {
return this.brushSize;
}
public int getEraserSize() {
return this.eraserSize;
}
private void updateHistory(Path path) {
if (historyPointer==paths.size()) {
paths.add(path);
paints.add(createPaint());
historyPointer++;
}
else {
// For undo and redo
paths.set(historyPointer,path);
paints.set(historyPointer,createPaint());
historyPointer++;
for (int i=historyPointer,size=paths.size();i<size;i++) {
paths.remove(historyPointer);
paints.remove(historyPointer);
}
}
}
private Path getCurrentPath() {
return paths.get(historyPointer-1);
}
private Paint getCurrentPaint() {
return paints.get(historyPointer-1);
}
#SuppressLint("ClickableViewAccessibility")
#Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
// Case when finger touches the screen
case MotionEvent.ACTION_DOWN:
touchStart(x,y);
break;
// Case when finger moves on screen
case MotionEvent.ACTION_MOVE:
touchMove(x,y);
break;
// Case when finger is taken away from screen
case MotionEvent.ACTION_UP:
touchUp();
break;
default :
return false;
}
return true;
}
private void touchStart(float x, float y) {
mX=x;
mY=y;
updateHistory(createPath(x,y));
}
private void touchMove(float x, float y) {
float dx = Math.abs(x-mX);
float dy = Math.abs(y-mY);
Path path = getCurrentPath();
if (dx>=TOUCH_TOLERANCE || dy>=TOUCH_TOLERANCE) {
path.quadTo(x,y,(x+mX)/2,(y+mY)/2);
mX=x;
mY=y;
}
invalidate();;
}
private void touchUp() {
}
}

I got the answer after many research and the following worked.
Just save the canvas layer after setting the background color and at last restore to count.
The onDraw method is as follows -
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(backgroundColor);
canvas.drawBitmap(bitmapBackground,0,0,null);
int layerId = canvas.saveLayer(0, 0, canvas.getWidth(), canvas.getHeight(), null, Canvas.ALL_SAVE_FLAG); // Line 1 added
for (int i=0;i<historyPointer;i++) {
Path path = paths.get(i);
Paint paint = paints.get(i);
canvas.drawPath(path,paint);
}
canvas.restoreToCount(layerId); // Line 2 added
}

for loop in run() SurfaceView Runnable Android

Hi I am trying to make an application that draws lines based on points a user enters. A user may input as many points possible and the object will draw these lines based on their x and y values. I have looked into many drawing tutorials and found that using a SurfaceView Runnable is the best way to do any kind of drawing or animation in Android. I have run into a problem where the run() function does not draw with for loops. Is there a way to get loops working in run() or somewhere else? My code is below.
public class draw extends SurfaceView implements Runnable {
Thread thread = null;
updateDraw draw = null;
boolean canDraw = false;
Path path;
Bitmap bitmap;
SurfaceHolder surfaceHolder;
Context mContext;
Paint paint;
int bitmapX;
int bitmapY;
int viewWidth;
int viewHeight;
ArrayList<ArrayList<Double>> XY;
Paint blue_paintbrush_stroke
public draw(Context context, ArrayList<ArrayList<Double>> XY) {
super(context);
mContext = context;
surfaceHolder = getHolder();
paint = new Paint();
path = new Path();
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
viewWidth = w;
viewHeight = h;
draw = new updateDraw(viewWidth, viewHeight);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inScaled = true;
options.inMutable = true;
bitmap = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.bitmap, options);
setUpBitmap();
}
#Override
public void run() {
Canvas canvas;
prepPaintBrushes();
while (canDraw) {
//draw stuff
if (surfaceHolder.getSurface().isValid()) {
int x = draw.getX();
int y = draw.getY();
canvas = surfaceHolder.lockCanvas();
canvas.save();
canvas.drawBitmap(bitmap, bitmapX, bitmapY, paint);
canvas.drawPath(path, blue_paintbrush_stroke);
for(int i = 0; i < XY.size()-1; i++){
float aX = (XY.get(i).get(0), XY.get(i).get(1)).get(0) + bitmapX;
float aY = (XY.get(i).get(0), XY.get(i).get(1)).get(1) + bitmapY;
float bX = (XY.get(i+1).get(0), XY.get(i+1).get(0)).get(0) + bitmapX;
float bY = (XY.get(i+1).get(0), XY.get(i+1).get(1)).get(1) + bitmapY;
canvas.drawLine(aX, aY, bX, bY, blue_paintbrush_stroke);
}
path.rewind();
canvas.restore();
surfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
private void updateFrame(int newX, int newY) {
draw.update(newX, newY);
}
private void setUpBitmap() {
bitmapX = (int) Math.floor(
Math.random() * (viewWidth - backGround.getWidth()));
bitmapY = (int) Math.floor(
Math.random() * (viewHeight - backGround.getHeight()));
}
public void pause() {
canDraw = false;
while (true) {
try {
thread.join();
break;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public void resume() {
canDraw = true;
thread = new Thread(this);
thread.start();
}
private void prepPaintBrushes() {
blue_paintbrush_stroke = new Paint();
blue_paintbrush_stroke.setColor(Color.BLUE);
blue_paintbrush_stroke.setStyle(Paint.Style.STROKE);
blue_paintbrush_stroke.setStrokeWidth(10);
}
#Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
setUpBitmap();
// Set coordinates of map.
updateFrame((int) x, (int) y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
// Updated coordinates for map.
updateFrame((int) x, (int) y);
invalidate();
break;
default:
// Do nothing.
}
return true;
}
}

Is better to override onDraw method and draw directly from it.
Create your custom class and extend from SurfaceView but is not
necessary to implement Runnable
Override onDraw(Canvas canvas)
remove run() method (use onDraw instead)

please make sure that you are calling the resume() method from the parent activity.
something like
#Override
protected void onResume(){
super.onResume();
customDraw.resume();
}

SurfaceView canvas drawing path with transparency

I have problems with my drawing application. I need to catch the correct touch screen and draw them to the canvas. Changing the size of the brush is working properly. But when I change the transparency setting, the program does not work correctly. It imposes a new path on top of the previous one, and the transparency is lost. Screenshot. Where could I go wrong? I need your help. Thank you.
This is my SurfaceView code:
public class PainterView extends SurfaceView implements SurfaceHolder.Callback {
private PainterThread painterThread;
private BrushParameters brushParameters;
private Bitmap bitmap;
public PainterView(Context context, AttributeSet attrs) {
super(context, attrs);
SurfaceHolder holder = getHolder();
holder.addCallback(this);
brushParameters = new BrushParameters();
}
#Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
setWillNotDraw(false);
getThread().setRunning(true);
getThread().start();
}
#Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int width, int height) {
if (bitmap == null) {
bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
getThread().setBitmap(bitmap, true);
} else {
getThread().setBitmap(bitmap, false);
}
}
#Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
getThread().setRunning(false);
boolean retry = true;
while (retry) {
try {
getThread().join();
retry = false;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
painterThread = null;
}
#Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
painterThread.startDraw(x, y);
break;
case MotionEvent.ACTION_MOVE:
painterThread.continueDraw(x, y);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
painterThread.finishDraw(x, y);
break;
}
return true;
}
#Override
protected void onDraw(Canvas canvas) {
canvas.drawBitmap(bitmap, 0, 0, null);
}
public BrushParameters getBrushParameters() {
return brushParameters;
}
public void setBrushColor(int color) {
brushParameters.setColor(color);
getThread().setBrushParameters(brushParameters);
}
public void setBrushSize(int size) {
brushParameters.setSize(size);
getThread().setBrushParameters(brushParameters);
}
public void setBrushAlpha(int alpha) {
brushParameters.setAlpha(alpha);
getThread().setBrushParameters(brushParameters);
}
public PainterThread getThread() {
if (painterThread == null) {
painterThread = new PainterThread(getHolder(), this);
}
return painterThread;
}
}
And my Thread class:
public class PainterThread extends Thread {
private SurfaceHolder surfaceHolder;
private PainterView painterView;
private boolean running = false;
private Paint paint;
private Path path;
private Bitmap mBitmap;
private Canvas mCanvas;
private float lastX, lastY;
private static float TOUCH_TOLERANCE = 4;
public PainterThread(SurfaceHolder surfaceHolder, PainterView painterView) {
this.surfaceHolder = surfaceHolder;
this.painterView = painterView;
path = new Path();
paint = new Paint();
paint.setAntiAlias(true);
paint.setDither(true);
paint.setColor(Color.BLACK);
paint.setAlpha(255);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(5);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeCap(Paint.Cap.ROUND);
}
public void setRunning(boolean running) {
this.running = running;
}
#Override
public void run() {
Canvas mCanvas;
while (running) {
mCanvas = null;
try {
mCanvas = surfaceHolder.lockCanvas(null);
synchronized (surfaceHolder) {
if (mCanvas != null) {
mCanvas.drawBitmap(mBitmap, 0, 0, paint);
painterView.postInvalidate();
}
}
} finally {
if (mCanvas != null) {
surfaceHolder.unlockCanvasAndPost(mCanvas);
}
}
}
}
public void setBitmap(Bitmap bitmap, boolean clear) {
mBitmap = bitmap;
if (clear) {
mBitmap.eraseColor(Color.WHITE);
}
mCanvas = new Canvas(mBitmap);
}
public void setBrushParameters(BrushParameters brushParameters) {
paint.setColor(brushParameters.getColor());
paint.setAlpha(brushParameters.getAlpha());
paint.setStrokeWidth(brushParameters.getSize());
}
public void startDraw(float x, float y) {
path.reset();
path.moveTo(x, y);
lastX = x;
lastY = y;
}
public void continueDraw(float x, float y) {
float dx = Math.abs(x - lastX);
float dy = Math.abs(y - lastY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
path.quadTo(lastX, lastY, (x + lastX) / 2, (y + lastY) / 2);
mCanvas.drawPath(path, paint);
lastX = x;
lastY = y;
}
}
public void finishDraw(float x, float y) {
path.moveTo(x, y);
mCanvas.drawPath(path, paint);
}
}
Thanks for help. I lost fiew days for find a cause of the problem...

I recommend getting rid of SurfaceView. You've got some confused-looking code (e.g. setBitmap() sets mCanvas, but that's getting overwritten in a loop by run()), and I think you're just making life harder on yourself.
SurfaceViews have two parts, the Surface and the View. The Surface is a separate layer that (by default) sits behind the View layer. The View part of the SurfaceView is normally just a transparent hole that lets you "see through" to the Surface layer behind.
In your case, you've overridden onDraw() in the View object, so you're actually drawing in the View. Over in your other thread you're drawing that same Bitmap onto the Surface. Even if your Bitmap has transparent pixels, you'll be seeing two identical Bitmaps layered on top of each other.
It looks like you're sharing a Bitmap and possibly a Canvas between two simultaneously-executing threads, which is a recipe for unhappiness.
If you get rid of the SurfaceView, and just use a custom View, I think everything will make more sense. The other approach is to get rid of onDraw() and the call to postInvalidate() and do everything on the Surface, but to take advantage of hardware-accelerated rendering it's better to use the custom View.

android SurfaceView onDraw Method Stop processing randomly

I have created SurfaceView class for drawing on the view by onTouch method... i have read and learned some sample codes about the SurfaceView and Drawing Activity and created the following class:
public class DrawingSurface extends SurfaceView implements
SurfaceHolder.Callback{
private DrawingThread drawingthread;
public Paint mPaint;
private Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
private float cx = 0, cy = 0;
private boolean easer = false;
private boolean touch = false;
private Paint mEarserPaint;
int count = 0;
public DrawingSurface(Context context, AttributeSet attrs) {
super(context, attrs);
getHolder().addCallback(this);
}
public DrawingSurface(Context context) {
super(context);
getHolder().addCallback(this);
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
System.out.println("onSizeChange");
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
System.out.println("onSurfaceChange");
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
System.out.println("onSurfaceCreated");
// For drawing that is called in the onDraw method
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(0xF0000000);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(12);
mEarserPaint = new Paint();
mEarserPaint.setAntiAlias(true);
mEarserPaint.setDither(true);
mEarserPaint.setColor(0xF0000000);
mEarserPaint.setStyle(Paint.Style.STROKE);
mEarserPaint.setStrokeJoin(Paint.Join.ROUND);
mEarserPaint.setStrokeCap(Paint.Cap.ROUND);
mEarserPaint.setStrokeWidth(12);
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
drawingthread = new DrawingThread(getHolder(), this);
drawingthread.setRunning(true);
drawingthread.start();
setFocusable(true);
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
System.out.println("OnDestroy");
boolean retry = true;
drawingthread.setRunning(false);
while (retry) {
try {
drawingthread.join();
retry = false;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
#Override
public void onDraw(Canvas canvas) {
// on earser mode draw circal on touch
if (easer && touch) {
canvas.drawColor(0xFFAAAAAA);
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawCircle(cx, cy, 50, mEarserPaint);
} else {
canvas.drawColor(0xFFAAAAAA);
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
}
}
#Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
// get the touch postion for drawing the circal
cx = event.getX();
cy = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touch_start(x, y);
touch = true;
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touch_move(x, y);
invalidate();
touch = true;
break;
case MotionEvent.ACTION_UP:
touch_up();
invalidate();
touch = false;
break;
}
return true;
}
private float mX, mY;
private static final float TOUCH_TOLERANCE = 4;
private void touch_start(float x, float y) {
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touch_move(float x, float y) {
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;
}
if (easer)
mCanvas.drawPath(mPath, mPaint);
}
private void touch_up() {
mPath.lineTo(mX, mY);
mCanvas.drawPath(mPath, mPaint);
mPath.reset();
}
public void onAttributeChange(Paint paint, boolean e) {
mPaint = paint;
easer = e;
}
public Bitmap getDrawingSurface() {
return mBitmap;
}
}
And this is the thread class for SurfaceView:
public class DrawingThread extends Thread {
private SurfaceHolder drawingHolder;
private DrawingSurface drawingSurface;
private boolean run = false;
public DrawingThread(SurfaceHolder surfaceholder, DrawingSurface surfaceview) {
drawingHolder = surfaceholder;
drawingSurface = surfaceview;
}
public void setRunning(boolean running) {
run = running;
}
#Override
public void run() {
Canvas c;
while (run) {
c = null;
try {
c = drawingHolder.lockCanvas(null);
if (c != null) {
synchronized (drawingHolder) {
drawingSurface.onDraw(c);
}
}
}finally {
if (c != null)
drawingHolder.unlockCanvasAndPost(c);
}
}
}
}
This is working fine form the start but it stop drawing randomly on the view (not crashing) after while (between 5 sec to 3 min) when i keep drawing .. what i figure is that onDraw method stop processing and i don't know why, there is no exception in the log and the onDestory method is not called when onDraw stop responding to my touch's.
hope you can help me with this problem.

I'm not sure why you have the DrawingThread. Your DrawingSurface class overrides onDraw and you call invalidate() to ask for it to be redrawn. That should be sufficient to do what you are trying to do.
I would comment out the DrawingThread and see if it magically comes together for you. I wrote a network whiteboarding app that started from the same sample code that looks like you started from.

How to draw a bitmap from sdcard to custom ondraw method

I have a image on sdcard can anyone tell me how to draw the image from sdcard onto the custom ondraw method

I got the answer actually to draw a image from sdcard we have to intialize the image again in the function below
public void surfaceCreated(SurfaceHolder holder)
{
ball=BitmapFactory.createScaledBitmap(src,width,height,true);
bgr=BitmapFactory.decodeFile("/sdcard/1364275090569.jpg");
}

Actually this is my code and in this i am able to draw and customly move the image over background through the images placed in the resource folder but when i load a image instead from the sdcard and then implement it the application gives error
public class Preview extends Activity{
BallBounces ball;
public static int wd;
public static int ht;
public static String txt;
public static String path;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
Intent i=getIntent();
ball = new BallBounces(this);
setContentView(ball);
txt=i.getStringExtra("bpath");
path=i.getStringExtra("path");
wd= getWindowManager().getDefaultDisplay().getWidth();
ht=getWindowManager().getDefaultDisplay().getHeight();
}
}
class BallBounces extends SurfaceView implements SurfaceHolder.Callback {
private int mActivePointerId = INVALID_POINTER_ID;
private static final int INVALID_POINTER_ID = -1;
private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.f;
public float mPosX=0;
public float mPosY=0;
public float mLastTouchX;
public float mLastTouchY;
//For Fetching image
private Bitmap bmp;
private Drawable image;
private byte[] byteArray;
private ByteArrayBuffer baf = null;
int wid =Preview.wd, hght = Preview.ht;
//For Rotation
int direction = 0;
int degree = 0;
String twxt=Preview.txt;
String pth=Preview.path;
float wdth,hgt;
private float newX ;
public float newY ;
private float rotateX;
private float rotateY;
private float imgX;
private float imgY;
GameThread thread;
public int screenW; //Device's screen width.
public int screenH; //Devices's screen height.
public int ballX; //Ball x position.
public int ballY; //Ball y position.
int initialY ;
float dY; //Ball vertical speed.
int ballW;
int ballH;
int bgrW;
int bgrH;
int angle;
int bgrScroll;
int dBgrY; //Background scroll speed.
float acc;
Bitmap ball, bgr, bgrReverse;
boolean reverseBackroundFirst;
boolean ballFingerMove;
Bitmap d;
//Measure frames per second.
long now;
int framesCount=0;
int framesCountAvg=0;
long framesTimer=0;
Paint fpsPaint=new Paint();
//Frame speed
long timeNow;
long timePrev = 0;
long timePrevFrame = 0;
long timeDelta;
public BallBounces(Context context) {
super(context);
ball = BitmapFactory.decodeResource(getResources(), R.drawable.bubble);//load image
bgr = BitmapFactory.decodeResource(getResources(), R.drawable.grd); //Load a background.
bgrW = bgr.getWidth();
bgrH = bgr.getHeight();
ballW = ball.getWidth();
ballH = ball.getHeight();
image =new BitmapDrawable(context.getResources() , ball);
imgX=image.getIntrinsicWidth();
imgY=image.getIntrinsicHeight();
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
//Set thread
getHolder().addCallback(this);
setFocusable(true);
}
#Override
public void onSizeChanged (int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//This event-method provides the real dimensions of this custom view.
screenW = w;
screenH = h;
System.out.println(w+" X "+h);
bgr = Bitmap.createScaledBitmap(bgr, w, h, true); //Scale background to fit the screen.
bgrW = bgr.getWidth();
bgrH = bgr.getHeight();
}
//***************************************
//************* TOUCH *****************
//***************************************
#Override
public synchronized boolean onTouchEvent(MotionEvent ev) {
mScaleDetector.onTouchEvent(ev);
final int action = ev.getActionMasked();
if (action == MotionEvent.ACTION_DOWN) {
System.out.println("DOWN");
final float x = ev.getX();
final float y = ev.getY();
mLastTouchX = x;
mLastTouchY = y;
System.out.println("DOWN-POSITION--"+x+" X "+y);
mActivePointerId = ev.getPointerId(0);
}
if (action == MotionEvent.ACTION_MOVE) {
System.out.println("MOVE");
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
final float x = ev.getX(pointerIndex);
final float y = ev.getY(pointerIndex);
System.out.println("Moving points" +x+" X "+y);
if (!mScaleDetector.isInProgress()) {
final float dx = x - mLastTouchX;
final float dy=y-mLastTouchY;
mPosX += dx;
mPosY += dy;
newX=ev.getRawX();
newY=ev.getRawY();
System.out.println("Image Config" +newX+" X "+newY);
invalidate();
}
mLastTouchX = x;
mLastTouchY = y;
}
if (action == MotionEvent.ACTION_UP) {
System.out.println("UP");
mActivePointerId = INVALID_POINTER_ID;
}
if (action == MotionEvent.ACTION_CANCEL) {
System.out.println("CANCEL");
mActivePointerId = INVALID_POINTER_ID;
}
if (action == MotionEvent.ACTION_POINTER_UP) {
System.out.println("ACTN_POINTER_UP");
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK)
>> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
}
return true;
}
public BitmapDrawable writeOnDrawable(int drawableId, String text){
Rect bounds = new Rect();
Paint textPaint = new Paint();
textPaint.getTextBounds(twxt,0,twxt.length(),bounds);
float height = bounds.height();
float width = bounds.width();
wdth=width/2;
hgt=height/2;
Bitmap bm = BitmapFactory.decodeResource(getResources(), drawableId).copy(Bitmap.Config.ARGB_8888, true);
Paint paint = new Paint();
paint.setStyle(Style.FILL_AND_STROKE);
paint.setColor(Color.WHITE);
paint.setTextSize(15);
Canvas canvas = new Canvas(bm);
int xPos =(int) ((bm.getWidth()/2)-wdth);
int yPos = (int) ((bm.getHeight()/2)-hgt) ;
canvas.drawText(text, xPos-(wdth/8),yPos+hgt, paint);
return new BitmapDrawable(bm);
}
#Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
Rect fromRect1 = new Rect(0, 0, bgrW - bgrScroll, bgrH);
Rect toRect1 = new Rect(bgrScroll, 0, bgrW, bgrH);
Rect fromRect2 = new Rect(bgrW - bgrScroll, 0, bgrW, bgrH);
Rect toRect2 = new Rect(0, 0, bgrScroll, bgrH);
if (!reverseBackroundFirst) {
canvas.drawBitmap(bgr, fromRect1, toRect1, null);
}
else{
canvas.drawBitmap(bgr, fromRect2, toRect2, null);
}
if(mPosX<0)
{
mPosX=0;
}
if(mPosX>screenW-ballW)
{
mPosX=screenW-ballW;
}
if(mPosY>screenH-ballH)
{
mPosY=screenH-ballH;
}
if(mPosY<0)
{
mPosY=0;
}
canvas.drawBitmap(ball, mPosX, mPosY, null);
canvas.drawText(mPosX+ " X "+mPosY, 40, 70, fpsPaint);
canvas.drawText(ballW+ " X "+ballH, 40, 100, fpsPaint);
canvas.drawText(screenW+ " X "+screenH, 40, 150, fpsPaint);
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
public void surfaceCreated(SurfaceHolder holder) {
thread = new GameThread(getHolder(), this);
thread.setRunning(true);
thread.start();
}
public void surfaceDestroyed(SurfaceHolder holder) {
boolean retry = true;
thread.setRunning(false);
while (retry) {
try {
thread.join();
retry = false;
} catch (InterruptedException e) {
}
}
}
class GameThread extends Thread {
private SurfaceHolder surfaceHolder;
private BallBounces gameView;
private boolean run = false;
public GameThread(SurfaceHolder surfaceHolder, BallBounces gameView) {
this.surfaceHolder = surfaceHolder;
this.gameView = gameView;
}
public void setRunning(boolean run) {
this.run = run;
}
public SurfaceHolder getSurfaceHolder() {
return surfaceHolder;
}
#Override
public void run() {
Canvas c;
while (run) {
c = null;
//limit frame rate to max 60fps
timeNow = System.currentTimeMillis();
timeDelta = timeNow - timePrevFrame;
if ( timeDelta < 16) {
try {
Thread.sleep(16 - timeDelta);
}
catch(InterruptedException e) {
}
}
timePrevFrame = System.currentTimeMillis();
try {
c = surfaceHolder.lockCanvas(null);
synchronized (surfaceHolder) {
//call methods to draw and process next fame
gameView.onDraw(c);
}
} finally {
if (c != null) {
surfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
#Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor();
// Don't let the object get too small or too large.
mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 5.0f));
invalidate();
return true;
}
}
}