android.view.animation
Class ScaleAnimation

java.lang.Object
  android.view.animation.Animation
      android.view.animation.ScaleAnimation

public class ScaleAnimation
extends Animation

An animation that controls the scale of an object. You can specify the point to use for the center of scaling.

Nested Class Summary

Nested classes/interfaces inherited from class android.view.animation.Animation

Animation.AnimationListener, Animation.Description

Field Summary

Fields inherited from class android.view.animation.Animation

ABSOLUTE, INFINITE, mCycleFlip, mDuration, mEnded, mFillAfter, mFillBefore, mInitialized, mInterpolator, mListener, mRepeatCount, mRepeated, mRepeatMode, mStarted, mStartOffset, mStartTime, RELATIVE_TO_PARENT, RELATIVE_TO_SELF, RESTART, REVERSE, START_ON_FIRST_FRAME, ZORDER_BOTTOM, ZORDER_NORMAL, ZORDER_TOP

Constructor Summary

ScaleAnimation(Context context, AttributeSet attrs)
Constructor used whan an ScaleAnimation is loaded from a resource.

ScaleAnimation(float fromX, float toX, float fromY, float toY)
Constructor to use when building a ScaleAnimation from code

ScaleAnimation(float fromX, float toX, float fromY, float toY, float pivotX, float pivotY)
Constructor to use when building a ScaleAnimation from code

ScaleAnimation(float fromX, float toX, float fromY, float toY, int pivotXType, float pivotXValue, int pivotYType, float pivotYValue)
Constructor to use when building a ScaleAnimation from code

Method Summary

protected void	applyTransformation(float interpolatedTime, Transformation t) Helper for getTransformation.
void	initialize(int width, int height, int parentWidth, int parentHeight) Initialize this animation with the dimensions of the object being animated as well as the objects parents.

Methods inherited from class android.view.animation.Animation

ensureInterpolator, getDuration, getFillAfter, getFillBefore, getInterpolator, getRepeatCount, getRepeatMode, getStartOffset, getStartTime, getTransformation, getZAdjustment, hasEnded, hasStarted, isInitialized, reset, resolveSize, restrictDuration, scaleCurrentDuration, setAnimationListener, setDuration, setFillAfter, setFillBefore, setInterpolator, setInterpolator, setRepeatCount, setRepeatMode, setStartOffset, setStartTime, setZAdjustment, start, startNow, willChangeBounds, willChangeTransformationMatrix

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ScaleAnimation

public ScaleAnimation(Context context,
                      AttributeSet attrs)

Constructor used whan an ScaleAnimation is loaded from a resource.

Parameters:

context - Application context to use

attrs - Attribute set from which to read values

ScaleAnimation

public ScaleAnimation(float fromX,
                      float toX,
                      float fromY,
                      float toY)

Constructor to use when building a ScaleAnimation from code

Parameters:

fromX - Horizontal scaling factor to apply at the start of the animation

toX - Horizontal scaling factor to apply at the end of the animation

fromY - Vertical scaling factor to apply at the start of the animation

toY - Vertical scaling factor to apply at the end of the animation

ScaleAnimation

public ScaleAnimation(float fromX,
                      float toX,
                      float fromY,
                      float toY,
                      float pivotX,
                      float pivotY)

Constructor to use when building a ScaleAnimation from code

Parameters:

fromX - Horizontal scaling factor to apply at the start of the animation

toX - Horizontal scaling factor to apply at the end of the animation

fromY - Vertical scaling factor to apply at the start of the animation

toY - Vertical scaling factor to apply at the end of the animation

pivotX - The X coordinate of the point about which the object is being scaled, specified as an absolute number where 0 is the left edge. (This point remains fixed while the object changes size.)

pivotY - The Y coordinate of the point about which the object is being scaled, specified as an absolute number where 0 is the top edge. (This point remains fixed while the object changes size.)

ScaleAnimation

public ScaleAnimation(float fromX,
                      float toX,
                      float fromY,
                      float toY,
                      int pivotXType,
                      float pivotXValue,
                      int pivotYType,
                      float pivotYValue)

Constructor to use when building a ScaleAnimation from code

Parameters:

fromX - Horizontal scaling factor to apply at the start of the animation

toX - Horizontal scaling factor to apply at the end of the animation

fromY - Vertical scaling factor to apply at the start of the animation

toY - Vertical scaling factor to apply at the end of the animation

pivotXType - Specifies how pivotXValue should be interpreted. One of Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or Animation.RELATIVE_TO_PARENT.

pivotXValue - The X coordinate of the point about which the object is being scaled, specified as an absolute number where 0 is the left edge. (This point remains fixed while the object changes size.) This value can either be an absolute number if pivotXType is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.

pivotYType - Specifies how pivotYValue should be interpreted. One of Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or Animation.RELATIVE_TO_PARENT.

pivotYValue - The Y coordinate of the point about which the object is being scaled, specified as an absolute number where 0 is the top edge. (This point remains fixed while the object changes size.) This value can either be an absolute number if pivotYType is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.

Method Detail

applyTransformation

protected void applyTransformation(float interpolatedTime,
                                   Transformation t)

Description copied from class: Animation

Helper for getTransformation. Subclasses should implement this to apply their transforms given an interpolation value. Implementations of this method should always replace the specified Transformation or document they are doing otherwise.

Overrides:

applyTransformation in class Animation

Parameters:

interpolatedTime - The value of the normalized time (0.0 to 1.0) after it has been run through the interpolation function.

t - The Transofrmation object to fill in with the current transforms.

initialize

public void initialize(int width,
                       int height,
                       int parentWidth,
                       int parentHeight)

Description copied from class: Animation

Initialize this animation with the dimensions of the object being animated as well as the objects parents. (This is to support animation sizes being specifed relative to these dimensions.)

Objects that interpret a Animations should call this method when the sizes of the object being animated and its parent are known, and before calling Animation.getTransformation(long, android.view.animation.Transformation).

Overrides:

initialize in class Animation

Parameters:

width - Width of the object being animated

height - Height of the object being animated

parentWidth - Width of the animated object's parent

parentHeight - Height of the animated object's parent