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Параллакс в живых обоях
20.10.2013, 01:22. Показов 831. Ответов 0
есть ли у кого исходник работающего простейшего кода параллакс-эффектом?
или помогите в моем, не знаю почему, не работающем примере:
Кликните здесь для просмотра всего текста
| Java | 1
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| package live.wallpaper.parall;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Handler;
import android.service.wallpaper.WallpaperService;
import android.view.SurfaceHolder;
public class DemoWallpaperService extends WallpaperService {
@Override
public Engine onCreateEngine() {
return new DemoWallpaperEngine();
}
private class DemoWallpaperEngine extends Engine {
Bitmap pic = BitmapFactory.decodeResource(getResources(), R.drawable.gear);
Bitmap bg = BitmapFactory.decodeResource(getResources(), R.drawable.bg7);
private boolean mVisible = false;
private final Handler mHandler = new Handler();
private final Runnable mUpdateDisplay = new Runnable() {
public void run() {
draw();
}
};
int offsetX;
@Override
public void onOffsetsChanged(float xOffset, float yOffset,
float xOffsetStep, float yOffsetStep, int xPixelOffset,
int yPixelOffset) {
this.offsetX = xPixelOffset;
super.onOffsetsChanged(xOffset, yOffset, xOffsetStep, yOffsetStep,
xPixelOffset, yPixelOffset);
}
@Override
public void onVisibilityChanged(boolean visible) {
mVisible = visible;
if (visible) {
draw();
} else {
mHandler.removeCallbacks(mUpdateDisplay);
}
}
@Override
public void onSurfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
draw();
}
@Override
public void onSurfaceDestroyed(SurfaceHolder holder) {
super.onSurfaceDestroyed(holder);
mVisible = false;
mHandler.removeCallbacks(mUpdateDisplay);
}
@Override
public void onDestroy() {
super.onDestroy();
mVisible = false;
mHandler.removeCallbacks(mUpdateDisplay);
}
int rotation = 1;
int bmpWidth = pic.getWidth();
private void draw() {
SurfaceHolder holder = getSurfaceHolder();
setTouchEventsEnabled(true);
Canvas c = null;
try {
c = holder.lockCanvas();
if (c != null) {
Paint p = new Paint();
p.setAntiAlias(false);
rotation += 8;
if (rotation > 360) {rotation = 1;}
c.drawBitmap(bg, this.offsetX, 0, p);
c.rotate(rotation, 170+bmpWidth/2+this.offsetX, 100+bmpWidth/2);
c.drawBitmap(pic, 170+this.offsetX, 100, p);
c.rotate(-rotation);
}
} finally {
if (c != null)
holder.unlockCanvasAndPost(c);
}
mHandler.removeCallbacks(mUpdateDisplay);
if (mVisible) {
mHandler.postDelayed(mUpdateDisplay, 20);
}
}
}
} |
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| package live.wallpaper.parall;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Point;
import android.os.Build;
import android.os.Handler;
import android.view.Display;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.ViewConfiguration;
import android.view.WindowManager;
import android.view.animation.Interpolator;
import android.widget.Scroller;
public class ZTouchMove {
public interface ZTouchMoveListener {
public void onTouchOffsetChanged(float xOffset);
}
private List<ZTouchMoveListener> mListeners = new ArrayList<ZTouchMoveListener>();
public class ZInterpolator implements Interpolator {
public float getInterpolation(float input) {
// f(x) = ax^3 + bx^2 + cx + d
// a = x - 2
// b = 3 - 2x
// c = x
// d = 0
// where x = derivative in point 0
//input = (float)(-Math.cos(10*((double)input/Math.PI)) + 1) / 2;
input = (mVelocity - 2) * (float) Math.pow(input, 3) + (3 - 2 * mVelocity) * (float) Math.pow(input, 2) + mVelocity * input;
return input;
}
}
Handler mHandler = new Handler();
final Runnable mRunnable = new Runnable()
{
public void run()
{
if(onMovingToPosition())
mHandler.postDelayed(this, 20);
}
};
private float mPosition = 0.5f;
private float mPositionDelta = 0;
private float mTouchDownX;
private int xDiff;
private VelocityTracker mVelocityTracker;
private float mVelocity = 0;
private Scroller mScroller;
private final static int TOUCH_STATE_REST = 0;
private final static int TOUCH_STATE_SCROLLING = 1;
private static final int SCROLLING_TIME = 300;
private static final int SNAP_VELOCITY = 350;
private int mTouchSlop;
private int mMaximumVelocity;
private int mTouchState = TOUCH_STATE_REST;
private int mWidth;
private int mNumVirtualScreens = 5;
@SuppressLint("NewApi")
@SuppressWarnings("deprecation")
public void init(Context ctx) {
mScroller = new Scroller(ctx, new ZInterpolator());
final ViewConfiguration configuration = ViewConfiguration.get(ctx);
mTouchSlop = configuration.getScaledTouchSlop();
mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
WindowManager wm = (WindowManager) ctx.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
// API Level 13
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
Point size = new Point();
display.getSize(size);
mWidth = size.x;
} else {
// API Level <13
mWidth = display.getWidth();
}
}
public void onTouchEvent(MotionEvent e) {
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(e);
final float x = e.getX();
final int action = e.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST : TOUCH_STATE_SCROLLING;
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
mTouchDownX = x;
break;
case MotionEvent.ACTION_MOVE:
xDiff = (int) (x - mTouchDownX);
if (Math.abs(xDiff) > mTouchSlop && mTouchState != TOUCH_STATE_SCROLLING) {
mTouchState = TOUCH_STATE_SCROLLING;
if(xDiff < 0)
mTouchDownX = mTouchDownX - mTouchSlop;
else
mTouchDownX = mTouchDownX + mTouchSlop;
xDiff = (int) (x - mTouchDownX);
}
if (mTouchState == TOUCH_STATE_SCROLLING) {
mPositionDelta = -(float)xDiff / (mWidth * mNumVirtualScreens);
}
break;
case MotionEvent.ACTION_UP:
if (mTouchState == TOUCH_STATE_SCROLLING) {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
float velocityX = velocityTracker.getXVelocity() / (float)(mNumVirtualScreens * mWidth);
mPosition = mPosition + mPositionDelta;
mPositionDelta = 0;
if(!returnSpring()) {
mVelocity = Math.min(3, Math.abs(velocityX * mNumVirtualScreens)) ;
// deaccelerate();
// Inertion
if(Math.abs(velocityX) * (float)(mNumVirtualScreens * mWidth) > SNAP_VELOCITY)
moveToPosition(mPosition, mPosition - (velocityX > 0 ? 1 : -1) * 1 / (float) mNumVirtualScreens );
else
moveToPosition(mPosition, mPosition - 0.7f * velocityX * ((float)SCROLLING_TIME / 1000) );
}
}
mTouchState = TOUCH_STATE_REST;
break;
case MotionEvent.ACTION_CANCEL:
mTouchState = TOUCH_STATE_REST;
mPositionDelta = 0;
break;
}
dispatchMoving();
}
private boolean returnSpring() {
mVelocity = 0;
if(mPositionDelta + mPosition > 1 - 0.5 / (float) mNumVirtualScreens)
moveToPosition(mPosition, (float) (1 - 0.5 / (float) mNumVirtualScreens));
else if(mPositionDelta + mPosition < 0.5 / (float) mNumVirtualScreens)
moveToPosition(mPosition, (float) 0.5 / (float) mNumVirtualScreens);
else
return false;
return true;
}
private void moveToPosition(float current_position, float desired_position) {
mScroller.startScroll((int)(current_position * 1000), 0, (int)((desired_position - current_position) * 1000), 0, SCROLLING_TIME);
mHandler.postDelayed(mRunnable, 20);
}
private boolean onMovingToPosition() {
if(mScroller.computeScrollOffset()) {
mPosition = (float)mScroller.getCurrX() / 1000;
dispatchMoving();
return true;
} else {
returnSpring();
return false;
}
}
private float normalizePosition(float xOffset) {
final float springZone = 1 / (float) mNumVirtualScreens;
// Normalized offset is from 0 to 0.5
float xOffsetNormalized = Math.abs(xOffset - 0.5f);
if(xOffsetNormalized + springZone / 2 > 0.5f) {
// Spring formula
// (0.5 - 2 * (1 - (x / (2 * springZone) + 0.5))^2) * springZone
// where x >=0 and <= springZone
// delta y = springZone / 2, y >=0 and y <= springZone / 2
xOffsetNormalized = 0.5f - springZone / 2 +
(0.5f - 2 * (float)Math.pow( (double)(1 - ( (xOffsetNormalized - 0.5f + springZone / 2) / (2 * springZone) + 0.5)), 2 ) ) * springZone;
if(xOffset < 0.5f)
xOffset = 0.5f - xOffsetNormalized;
else
xOffset = 0.5f + xOffsetNormalized;
}
return xOffset;
}
public synchronized void addMovingListener(ZTouchMoveListener listener) {
mListeners.add(listener);
}
private synchronized void dispatchMoving() {
Iterator<ZTouchMoveListener> iterator = mListeners.iterator();
while(iterator.hasNext()) {
((ZTouchMoveListener) iterator.next()).onTouchOffsetChanged(normalizePosition(mPosition + mPositionDelta));
}
}
} |
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