com.octo.android.robospice.sample.offline.MandelbrotView Maven / Gradle / Ivy
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package com.octo.android.robospice.sample.offline;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PointF;
import android.util.AttributeSet;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import com.octo.android.robospice.SpiceManager;
import com.octo.android.robospice.persistence.exception.SpiceException;
import com.octo.android.robospice.request.SpiceRequest;
import com.octo.android.robospice.request.listener.RequestListener;
import com.octo.android.robospice.sample.model.FractalOperator;
import com.octo.android.robospice.sample.model.OptimizedMandelbrotOperator;
import com.octo.android.robospice.sample.request.FractalRequest;
/**
* From
* http://www.java2s.com/Open-Source/Android/UnTagged/android-mandelbrot-set/org/girino/frac/android/MandelbrotView.
* java.htm
*
* @author sni
*/
public class MandelbrotView extends ImageView implements OnTouchListener {
private static final int ROW_HEIGHT = 32;
private static final int VERTICAL_MARGIN = 50;
private static final String TAG = "Touch";
private double x0 = 0.0;
private double y0 = 0.0;
private int width = 320;
private int height = 480;
private double scale = 100.0 * 300.0 / width;
private float xoffset = 0;
private float yoffset = 0;
private Bitmap mBitmap;
private Canvas mCanvas;
private Paint mBitmapPaint;
// The 3 states (events) which the user is trying to perform
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
// these PointF objects are used to record the point(s) the user is touching
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
private float scaleFactor = 1.0f;
private FractalOperator fractalOperator = new OptimizedMandelbrotOperator();
private SpiceManager spiceManager;
private double oldScale = scale;
private SpiceRequest< Bitmap > fractalRequest;
public MandelbrotView( Context context, AttributeSet attrs, int defStyle ) {
super( context, attrs, defStyle );
initialize();
}
public MandelbrotView( Context context, AttributeSet attrs ) {
super( context, attrs );
initialize();
}
public MandelbrotView( Context context ) {
super( context );
initialize();
}
private void initialize() {
rescale( getWidth(), getHeight() );
mBitmapPaint = new Paint( Paint.DITHER_FLAG );
// draws first mandelbrot
mCanvas.drawARGB( 0xff, 10, 10, 10 );
setOnTouchListener( this );
}
public void setSpiceManager( SpiceManager spiceManager ) {
this.spiceManager = spiceManager;
}
private void rescale( int w, int h ) {
w = w > 0 ? w : 1;
width = w;
scale *= (double) w / (double) width;
height = h > 0 ? h : 1;
mBitmap = Bitmap.createBitmap( width, height, Bitmap.Config.ARGB_8888 );
mCanvas = new Canvas( mBitmap );
}
public void start() {
Log.d( "MandelbrotView", "starting..." );
fractalRequest = new FractalRequest( x0, y0, width, height, scale, fractalOperator, mBitmap );
// spiceManager.execute( fractalRequest, "fractal", DurationInMillis.ALWAYS, new FractalResultListener() );
spiceManager.execute( fractalRequest, new FractalResultListener() );
invalidate();
Log.d( "MandelbrotView", "started..." );
}
public void stop() {
Log.d( "MandelbrotView", "stoping..." );
if ( fractalRequest != null ) {
fractalRequest.cancel();
}
Log.d( "MandelbrotView", "stoped..." );
}
@Override
protected void onSizeChanged( int w, int h, int oldw, int oldh ) {
Log.d( "MandelbrotView", "onSizeChanged begin..." );
Log.d( "MandelbrotView", "Size: " + w + "x" + h );
super.onSizeChanged( w, h, oldw, oldh );
stop();
rescale( w, h );
start();
Log.d( "MandelbrotView", "onSizeChanged end..." );
}
@Override
protected void onDraw( Canvas canvas ) {
// avoids drawing too much
canvas.drawBitmap( mBitmap, xoffset, yoffset, mBitmapPaint );
Paint paintBlue = new Paint();
paintBlue.setStyle( Paint.Style.STROKE );
paintBlue.setStrokeWidth( 3 );
paintBlue.setTextSize( ROW_HEIGHT );
paintBlue.setColor( Color.WHITE );
canvas.drawText( "X:" + x0, 10, VERTICAL_MARGIN, paintBlue );
canvas.drawText( "Y:" + y0, 10, VERTICAL_MARGIN + 32, paintBlue );
canvas.drawText( "scale:" + scale, 10, VERTICAL_MARGIN + 32 * 2, paintBlue );
if ( mode == ZOOM ) {
float w = width / scaleFactor;
float h = height / scaleFactor;
Paint paint = new Paint();
paint.setStyle( Paint.Style.STROKE );
paint.setStrokeWidth( 3 );
paint.setTextSize( ROW_HEIGHT );
paint.setColor( Color.RED );
canvas.drawCircle( mid.x, mid.y, Math.min( w, h ), paint );
canvas.drawCircle( mid.x, mid.y, 5, paint );
canvas.drawText( "Scale:" + scale * scaleFactor, width / 2, height * 0.95f, paint );
canvas.drawText( "Mid:" + mid.x + "," + mid.y, width / 2, height * 0.95f + ROW_HEIGHT, paint );
}
// stops only after drawing a last time
invalidate();
}
@Override
public boolean onTouch( View v, MotionEvent event ) {
ImageView view = (ImageView) v;
view.setScaleType( ImageView.ScaleType.MATRIX );
dumpState();
dumpEvent( event );
// Handle touch events here...
switch ( event.getAction() & MotionEvent.ACTION_MASK ) {
case MotionEvent.ACTION_DOWN: // first finger down only
start.set( event.getX(), event.getY() );
Log.d( TAG, "mode=DRAG" ); // write to LogCat
mode = DRAG;
break;
case MotionEvent.ACTION_UP: // first finger lifted
case MotionEvent.ACTION_POINTER_UP: // second finger lifted
if ( mode == ZOOM ) {
stop();
zoom( scaleFactor );
moveTo( mid.x, mid.y );
scaleFactor = 1.0f;
start();
} else if ( mode == DRAG ) {
stop();
moveBy( event.getX(), event.getY() );
Log.d( TAG, "x0=" + x0 );
Log.d( TAG, "y0=" + y0 );
start();
}
mode = NONE;
Log.d( TAG, "mode=NONE" );
break;
case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down
oldDist = spacing( event );
Log.d( TAG, "oldDist=" + oldDist );
if ( oldDist > 5f ) {
mode = ZOOM;
oldScale = scale;
Log.d( TAG, "mode=ZOOM" );
}
break;
case MotionEvent.ACTION_MOVE:
if ( mode == DRAG ) {
// in the matrix of points
} else if ( mode == ZOOM ) {
// pinch zooming
float newDist = spacing( event );
Log.d( TAG, "newDist=" + newDist );
if ( newDist > 5f ) {
midPoint( mid, event );
scaleFactor = newDist / oldDist; // setting the scaling of the
}
}
break;
}
return true; // indicate event was handled
}
private void moveTo( float x, float y ) {
x0 += (float) ( ( x - width / 2 ) / scale );
y0 += (float) ( ( y - height / 2 ) / scale );
}
private void moveBy( float x, float y ) {
float translateX = (float) ( ( x - start.x ) / scale );
float translateY = (float) ( ( y - start.y ) / scale );
x0 -= translateX;
y0 -= translateY;
}
/*
* -------------------------------------------------------------------------- Method: spacing Parameters:
* MotionEvent Returns: float Description: checks the spacing between the two fingers on touch
* ----------------------------------------------------
*/
private float spacing( MotionEvent event ) {
float x = event.getX( 0 ) - event.getX( 1 );
float y = event.getY( 0 ) - event.getY( 1 );
return FloatMath.sqrt( x * x + y * y );
}
/*
* -------------------------------------------------------------------------- Method: midPoint Parameters: PointF
* object, MotionEvent Returns: void Description: calculates the midpoint between the two fingers
* ------------------------------------------------------------
*/
private void midPoint( PointF point, MotionEvent event ) {
float x = event.getX( 0 ) + event.getX( 1 );
float y = event.getY( 0 ) + event.getY( 1 );
point.set( x / 2, y / 2 );
}
/** Show an event in the LogCat view, for debugging */
private void dumpEvent( MotionEvent event ) {
String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE", "POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
StringBuilder sb = new StringBuilder();
int action = event.getAction();
int actionCode = action & MotionEvent.ACTION_MASK;
sb.append( "event ACTION_" ).append( names[ actionCode ] );
if ( actionCode == MotionEvent.ACTION_POINTER_DOWN || actionCode == MotionEvent.ACTION_POINTER_UP ) {
sb.append( "(pid " ).append( action >> MotionEvent.ACTION_POINTER_ID_SHIFT );
sb.append( ")" );
}
sb.append( "[" );
for ( int i = 0; i < event.getPointerCount(); i++ ) {
sb.append( "#" ).append( i );
sb.append( "(pid " ).append( event.getPointerId( i ) );
sb.append( ")=" ).append( (int) event.getX( i ) );
sb.append( "," ).append( (int) event.getY( i ) );
if ( i + 1 < event.getPointerCount() ) {
sb.append( ";" );
}
}
sb.append( "]" );
Log.d( "Touch Events ---------", sb.toString() );
}
/** Show an event in the LogCat view, for debugging */
private void dumpState() {
StringBuilder sb = new StringBuilder();
sb.append( "x0=" + x0 ).append( "\ny0=" + y0 );
sb.append( "\nscale=" + scale ).append( "\noldScale=" + oldScale );
sb.append( "\nscaleFactor=" + scaleFactor );
sb.append( "\nmidPoint=" + mid.x + " " + mid.y );
Log.d( "Fractal state ---------", sb.toString() );
}
public void zoom( double factor ) {
scale *= factor;
Log.d( TAG, "Zooming factor :" + factor );
}
public void reset() {
stop();
x0 = 0;
y0 = 0;
scale = 100.0 * 300.0 / width;
start();
}
private class FractalResultListener implements RequestListener< Bitmap > {
@Override
public void onRequestFailure( SpiceException spiceException ) {
}
@Override
public void onRequestSuccess( Bitmap result ) {
mBitmap = result;
invalidate();
}
}
}
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