Java Code Examples for android.util.FloatMath#sqrt()
The following examples show how to use
android.util.FloatMath#sqrt() .
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Example 1
| Source File: TwoFingerGestureDetector.java From OpenMapKitAndroid with BSD 3-Clause "New" or "Revised" License | 5 votes |
|
/**
* Return the current distance between the two pointers forming the
* gesture in progress.
*
* @return Distance between pointers in pixels.
*/
public float getCurrentSpan() {
if (mCurrLen == -1) {
final float cvx = mCurrFingerDiffX;
final float cvy = mCurrFingerDiffY;
mCurrLen = FloatMath.sqrt(cvx * cvx + cvy * cvy);
}
return mCurrLen;
}
Example 2
| Source File: BitmapUtils.java From android-open-project-demo with Apache License 2.0 | 5 votes |
|
public static BitmapSize getScaledSize(int originalWidth, int originalHeight, int numPixels) {
float ratio = (float)originalWidth/originalHeight;
int scaledHeight = (int)FloatMath.sqrt((float)numPixels/ratio);
int scaledWidth = (int)(ratio * FloatMath.sqrt((float)numPixels/ratio));
return new BitmapSize(scaledWidth, scaledHeight);
}
Example 3
| Source File: Shake2Share.java From ShareSDKShareDifMsgDemo-Android with MIT License | 5 votes |
|
public void onSensorChanged(SensorEvent event) {
long currentTime = System.currentTimeMillis();
long diffTime = currentTime - mLastUpdateTime;
if (diffTime > UPDATE_INTERVAL) {
if(mLastUpdateTime != 0) {
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
float deltaX = x - mLastX;
float deltaY = y - mLastY;
float deltaZ = z - mLastZ;
float delta = FloatMath.sqrt(deltaX * deltaX + deltaY * deltaY + deltaZ * deltaZ) / diffTime * 10000;
if (delta > SHAKE_THRESHOLD) {
if (!shaken) {
shaken = true;
finish();
}
if (listener != null) {
listener.onShake();
}
}
mLastX = x;
mLastY = y;
mLastZ = z;
}
mLastUpdateTime = currentTime;
}
}
Example 4
| Source File: PicViewer.java From BigApp_Discuz_Android with Apache License 2.0 | 5 votes |
|
/**
* 两点的距离
*/
@SuppressLint("FloatMath")
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);
}
Example 5
| Source File: TwoFingerGestureDetector.java From UltimateAndroid with Apache License 2.0 | 5 votes |
|
/**
* Return the current distance between the two pointers forming the
* gesture in progress.
*
* @return Distance between pointers in pixels.
*/
public float getCurrentSpan() {
if (mCurrLen == -1) {
final float cvx = mCurrFingerDiffX;
final float cvy = mCurrFingerDiffY;
mCurrLen = FloatMath.sqrt(cvx*cvx + cvy*cvy);
}
return mCurrLen;
}
Example 6
| Source File: Shake2Share.java From BigApp_Discuz_Android with Apache License 2.0 | 5 votes |
|
public void onSensorChanged(SensorEvent event) {
long currentTime = System.currentTimeMillis();
long diffTime = currentTime - mLastUpdateTime;
if (diffTime > UPDATE_INTERVAL) {
if(mLastUpdateTime != 0) {
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
float deltaX = x - mLastX;
float deltaY = y - mLastY;
float deltaZ = z - mLastZ;
float delta = FloatMath.sqrt(deltaX * deltaX + deltaY * deltaY + deltaZ * deltaZ) / diffTime * 10000;
if (delta > SHAKE_THRESHOLD) {
if (!shaken) {
shaken = true;
finish();
}
if (listener != null) {
listener.onShake();
}
}
mLastX = x;
mLastY = y;
mLastZ = z;
}
mLastUpdateTime = currentTime;
}
}
Example 7
| Source File: PLMath.java From PanoramaGL with Apache License 2.0 | 4 votes |
|
/**distance methods*/
public static float distanceBetweenPoints(CGPoint point1, CGPoint point2)
{
return FloatMath.sqrt(((point2.x - point1.x) * (point2.x - point1.x)) + ((point2.y - point1.y) * (point2.y - point1.y)));
}
Example 8
| Source File: EaseCircularIn.java From 30-android-libraries-in-30-days with Apache License 2.0 | 4 votes |
|
public static float getValue(final float pPercentage) {
return -(FloatMath.sqrt(1 - pPercentage * pPercentage) - 1.0f);
}
Example 9
| Source File: PhotoViewAttacher.java From light-novel-library_Wenku8_Android with GNU General Public License v2.0 | 4 votes |
|
@Override
public float getScale() {
return FloatMath.sqrt((float) Math.pow(getValue(mSuppMatrix, Matrix.MSCALE_X), 2) + (float) Math.pow(getValue(mSuppMatrix, Matrix.MSKEW_Y), 2));
}
Example 10
| Source File: VersionedGestureDetector.java From WifiChat with GNU General Public License v2.0 | 4 votes |
|
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN: {
mVelocityTracker = VelocityTracker.obtain();
mVelocityTracker.addMovement(ev);
mLastTouchX = getActiveX(ev);
mLastTouchY = getActiveY(ev);
mIsDragging = false;
break;
}
case MotionEvent.ACTION_MOVE: {
final float x = getActiveX(ev);
final float y = getActiveY(ev);
final float dx = x - mLastTouchX, dy = y - mLastTouchY;
if (!mIsDragging) {
// Use Pythagoras to see if drag length is larger than
// touch slop
mIsDragging = FloatMath.sqrt((dx * dx) + (dy * dy)) >= mTouchSlop;
}
if (mIsDragging) {
mListener.onDrag(dx, dy);
mLastTouchX = x;
mLastTouchY = y;
if (null != mVelocityTracker) {
mVelocityTracker.addMovement(ev);
}
}
break;
}
case MotionEvent.ACTION_CANCEL: {
// Recycle Velocity Tracker
if (null != mVelocityTracker) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
break;
}
case MotionEvent.ACTION_UP: {
if (mIsDragging) {
if (null != mVelocityTracker) {
mLastTouchX = getActiveX(ev);
mLastTouchY = getActiveY(ev);
// Compute velocity within the last 1000ms
mVelocityTracker.addMovement(ev);
mVelocityTracker.computeCurrentVelocity(1000);
final float vX = mVelocityTracker.getXVelocity(), vY = mVelocityTracker
.getYVelocity();
// If the velocity is greater than minVelocity, call
// listener
if (Math.max(Math.abs(vX), Math.abs(vY)) >= mMinimumVelocity) {
mListener.onFling(mLastTouchX, mLastTouchY, -vX, -vY);
}
}
}
// Recycle Velocity Tracker
if (null != mVelocityTracker) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
break;
}
}
return true;
}
Example 11
| Source File: CropPhotoViewAttacher.java From ImageSelector with Apache License 2.0 | 4 votes |
|
@Override
public float getScale() {
return FloatMath.sqrt((float) Math.pow(getValue(mSuppMatrix, Matrix.MSCALE_X), 2) + (float) Math.pow(getValue(mSuppMatrix, Matrix.MSKEW_Y), 2));
}
Example 12
| Source File: Scroller.java From UltimateAndroid with Apache License 2.0 | 4 votes |
|
/**
* Start scrolling based on a fling gesture. The distance travelled will
* depend on the initial velocity of the fling.
*
* @param startX Starting point of the scroll (X)
* @param startY Starting point of the scroll (Y)
* @param velocityX Initial velocity of the fling (X) measured in pixels per
* second.
* @param velocityY Initial velocity of the fling (Y) measured in pixels per
* second
* @param minX Minimum X value. The scroller will not scroll past this
* point.
* @param maxX Maximum X value. The scroller will not scroll past this
* point.
* @param minY Minimum Y value. The scroller will not scroll past this
* point.
* @param maxY Maximum Y value. The scroller will not scroll past this
* point.
*/
public void fling(int startX, int startY, int velocityX, int velocityY,
int minX, int maxX, int minY, int maxY) {
// Continue a scroll or fling in progress
if (mFlywheel && !mFinished) {
float oldVel = getCurrVelocity();
float dx = (float) (mFinalX - mStartX);
float dy = (float) (mFinalY - mStartY);
float hyp = FloatMath.sqrt(dx * dx + dy * dy);
float ndx = dx / hyp;
float ndy = dy / hyp;
float oldVelocityX = ndx * oldVel;
float oldVelocityY = ndy * oldVel;
if (Math.signum(velocityX) == Math.signum(oldVelocityX) &&
Math.signum(velocityY) == Math.signum(oldVelocityY)) {
velocityX += oldVelocityX;
velocityY += oldVelocityY;
}
}
mMode = FLING_MODE;
mFinished = false;
float velocity = FloatMath.sqrt(velocityX * velocityX + velocityY * velocityY);
mVelocity = velocity;
final double l = Math.log(START_TENSION * velocity / ALPHA);
mDuration = (int) (1000.0 * Math.exp(l / (DECELERATION_RATE - 1.0)));
mStartTime = AnimationUtils.currentAnimationTimeMillis();
mStartX = startX;
mStartY = startY;
float coeffX = velocity == 0 ? 1.0f : velocityX / velocity;
float coeffY = velocity == 0 ? 1.0f : velocityY / velocity;
int totalDistance =
(int) (ALPHA * Math.exp(DECELERATION_RATE / (DECELERATION_RATE - 1.0) * l));
mMinX = minX;
mMaxX = maxX;
mMinY = minY;
mMaxY = maxY;
mFinalX = startX + Math.round(totalDistance * coeffX);
// Pin to mMinX <= mFinalX <= mMaxX
mFinalX = Math.min(mFinalX, mMaxX);
mFinalX = Math.max(mFinalX, mMinX);
mFinalY = startY + Math.round(totalDistance * coeffY);
// Pin to mMinY <= mFinalY <= mMaxY
mFinalY = Math.min(mFinalY, mMaxY);
mFinalY = Math.max(mFinalY, mMinY);
}
Example 13
| Source File: Scroller.java From zen4android with MIT License | 4 votes |
|
/**
* Start scrolling based on a fling gesture. The distance travelled will
* depend on the initial velocity of the fling.
*
* @param startX Starting point of the scroll (X)
* @param startY Starting point of the scroll (Y)
* @param velocityX Initial velocity of the fling (X) measured in pixels per
* second.
* @param velocityY Initial velocity of the fling (Y) measured in pixels per
* second
* @param minX Minimum X value. The scroller will not scroll past this
* point.
* @param maxX Maximum X value. The scroller will not scroll past this
* point.
* @param minY Minimum Y value. The scroller will not scroll past this
* point.
* @param maxY Maximum Y value. The scroller will not scroll past this
* point.
*/
public void fling(int startX, int startY, int velocityX, int velocityY,
int minX, int maxX, int minY, int maxY) {
// Continue a scroll or fling in progress
if (mFlywheel && !mFinished) {
float oldVel = getCurrVelocity();
float dx = (float) (mFinalX - mStartX);
float dy = (float) (mFinalY - mStartY);
float hyp = FloatMath.sqrt(dx * dx + dy * dy);
float ndx = dx / hyp;
float ndy = dy / hyp;
float oldVelocityX = ndx * oldVel;
float oldVelocityY = ndy * oldVel;
if (Math.signum(velocityX) == Math.signum(oldVelocityX) &&
Math.signum(velocityY) == Math.signum(oldVelocityY)) {
velocityX += oldVelocityX;
velocityY += oldVelocityY;
}
}
mMode = FLING_MODE;
mFinished = false;
float velocity = FloatMath.sqrt(velocityX * velocityX + velocityY * velocityY);
mVelocity = velocity;
final double l = Math.log(START_TENSION * velocity / ALPHA);
mDuration = (int) (1000.0 * Math.exp(l / (DECELERATION_RATE - 1.0)));
mStartTime = AnimationUtils.currentAnimationTimeMillis();
mStartX = startX;
mStartY = startY;
float coeffX = velocity == 0 ? 1.0f : velocityX / velocity;
float coeffY = velocity == 0 ? 1.0f : velocityY / velocity;
int totalDistance =
(int) (ALPHA * Math.exp(DECELERATION_RATE / (DECELERATION_RATE - 1.0) * l));
mMinX = minX;
mMaxX = maxX;
mMinY = minY;
mMaxY = maxY;
mFinalX = startX + Math.round(totalDistance * coeffX);
// Pin to mMinX <= mFinalX <= mMaxX
mFinalX = Math.min(mFinalX, mMaxX);
mFinalX = Math.max(mFinalX, mMinX);
mFinalY = startY + Math.round(totalDistance * coeffY);
// Pin to mMinY <= mFinalY <= mMaxY
mFinalY = Math.min(mFinalY, mMaxY);
mFinalY = Math.max(mFinalY, mMinY);
}
Example 14
| Source File: PhotoViewAttacher.java From Tweetin with Apache License 2.0 | 4 votes |
|
@Override
public float getScale() {
return FloatMath.sqrt((float) Math.pow(getValue(mSuppMatrix, Matrix.MSCALE_X), 2) + (float) Math.pow(getValue(mSuppMatrix, Matrix.MSKEW_Y), 2));
}
Example 15
| Source File: ScaleImageView.java From ImageChoose with MIT License | 4 votes |
|
private float distance(float x0, float x1, float y0, float y1) {
float x = x0 - x1;
float y = y0 - y1;
return FloatMath.sqrt(x * x + y * y);
}
Example 16
| Source File: Scroller.java From WayHoo with Apache License 2.0 | 4 votes |
|
/**
* Start scrolling based on a fling gesture. The distance travelled will
* depend on the initial velocity of the fling.
*
* @param startX Starting point of the scroll (X)
* @param startY Starting point of the scroll (Y)
* @param velocityX Initial velocity of the fling (X) measured in pixels per
* second.
* @param velocityY Initial velocity of the fling (Y) measured in pixels per
* second
* @param minX Minimum X value. The scroller will not scroll past this
* point.
* @param maxX Maximum X value. The scroller will not scroll past this
* point.
* @param minY Minimum Y value. The scroller will not scroll past this
* point.
* @param maxY Maximum Y value. The scroller will not scroll past this
* point.
*/
public void fling(int startX, int startY, int velocityX, int velocityY,
int minX, int maxX, int minY, int maxY) {
// Continue a scroll or fling in progress
if (mFlywheel && !mFinished) {
float oldVel = getCurrVelocity();
float dx = (float) (mFinalX - mStartX);
float dy = (float) (mFinalY - mStartY);
float hyp = FloatMath.sqrt(dx * dx + dy * dy);
float ndx = dx / hyp;
float ndy = dy / hyp;
float oldVelocityX = ndx * oldVel;
float oldVelocityY = ndy * oldVel;
if (Math.signum(velocityX) == Math.signum(oldVelocityX)
&& Math.signum(velocityY) == Math.signum(oldVelocityY)) {
velocityX += oldVelocityX;
velocityY += oldVelocityY;
}
}
mMode = FLING_MODE;
mFinished = false;
float velocity = FloatMath.sqrt(velocityX * velocityX + velocityY * velocityY);
mVelocity = velocity;
final double l = Math.log(START_TENSION * velocity / ALPHA);
mDuration = (int) (1000.0 * Math.exp(l / (DECELERATION_RATE - 1.0)));
mStartTime = AnimationUtils.currentAnimationTimeMillis();
mStartX = startX;
mStartY = startY;
float coeffX = velocity == 0 ? 1.0f : velocityX / velocity;
float coeffY = velocity == 0 ? 1.0f : velocityY / velocity;
int totalDistance =
(int) (ALPHA * Math.exp(DECELERATION_RATE / (DECELERATION_RATE - 1.0) * l));
mMinX = minX;
mMaxX = maxX;
mMinY = minY;
mMaxY = maxY;
mFinalX = startX + Math.round(totalDistance * coeffX);
// Pin to mMinX <= mFinalX <= mMaxX
mFinalX = Math.min(mFinalX, mMaxX);
mFinalX = Math.max(mFinalX, mMinX);
mFinalY = startY + Math.round(totalDistance * coeffY);
// Pin to mMinY <= mFinalY <= mMaxY
mFinalY = Math.min(mFinalY, mMaxY);
mFinalY = Math.max(mFinalY, mMinY);
}
Example 17
| Source File: PhotoViewAttacher.java From UltimateAndroid with Apache License 2.0 | 4 votes |
|
@Override
public float getScale() {
return FloatMath.sqrt((float) Math.pow(getValue(mSuppMatrix, Matrix.MSCALE_X), 2) + (float) Math.pow(getValue(mSuppMatrix, Matrix.MSKEW_Y), 2));
}
Example 18
| Source File: CupcakeGestureDetector.java From narrate-android with Apache License 2.0 | 4 votes |
|
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN: {
mVelocityTracker = VelocityTracker.obtain();
if (null != mVelocityTracker) {
mVelocityTracker.addMovement(ev);
} else {
Log.i(LOG_TAG, "Velocity tracker is null");
}
mLastTouchX = getActiveX(ev);
mLastTouchY = getActiveY(ev);
mIsDragging = false;
break;
}
case MotionEvent.ACTION_MOVE: {
final float x = getActiveX(ev);
final float y = getActiveY(ev);
final float dx = x - mLastTouchX, dy = y - mLastTouchY;
if (!mIsDragging) {
// Use Pythagoras to see if drag length is larger than
// touch slop
mIsDragging = FloatMath.sqrt((dx * dx) + (dy * dy)) >= mTouchSlop;
}
if (mIsDragging) {
mListener.onDrag(dx, dy);
mLastTouchX = x;
mLastTouchY = y;
if (null != mVelocityTracker) {
mVelocityTracker.addMovement(ev);
}
}
break;
}
case MotionEvent.ACTION_CANCEL: {
// Recycle Velocity Tracker
if (null != mVelocityTracker) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
break;
}
case MotionEvent.ACTION_UP: {
if (mIsDragging) {
if (null != mVelocityTracker) {
mLastTouchX = getActiveX(ev);
mLastTouchY = getActiveY(ev);
// Compute velocity within the last 1000ms
mVelocityTracker.addMovement(ev);
mVelocityTracker.computeCurrentVelocity(1000);
final float vX = mVelocityTracker.getXVelocity(), vY = mVelocityTracker
.getYVelocity();
// If the velocity is greater than minVelocity, call
// listener
if (Math.max(Math.abs(vX), Math.abs(vY)) >= mMinimumVelocity) {
mListener.onFling(mLastTouchX, mLastTouchY, -vX,
-vY);
}
}
}
// Recycle Velocity Tracker
if (null != mVelocityTracker) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
break;
}
}
return true;
}
Example 19
| Source File: OverScroller.java From Klyph with MIT License | 4 votes |
|
/**
* Returns the absolute value of the current velocity.
*
* @return The original velocity less the deceleration, norm of the X and Y velocity vector.
*/
public float getCurrVelocity() {
float squaredNorm = mScrollerX.mCurrVelocity * mScrollerX.mCurrVelocity;
squaredNorm += mScrollerY.mCurrVelocity * mScrollerY.mCurrVelocity;
return FloatMath.sqrt(squaredNorm);
}
Example 20
| Source File: PointF.java From letv with Apache License 2.0 | 4 votes |
|
public static float length(float x, float y) {
return FloatMath.sqrt((x * x) + (y * y));
}
