/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.view.animation;
import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.util.TypedValue;
/**
* An animation that controls the scale of an object. You can specify the point
* to use for the center of scaling.
*
*/
public class ScaleAnimation extends Animation {
private final Resources mResources;
private float mFromX;
private float mToX;
private float mFromY;
private float mToY;
private int mFromXType = TypedValue.TYPE_NULL;
private int mToXType = TypedValue.TYPE_NULL;
private int mFromYType = TypedValue.TYPE_NULL;
private int mToYType = TypedValue.TYPE_NULL;
private int mFromXData = 0;
private int mToXData = 0;
private int mFromYData = 0;
private int mToYData = 0;
private int mPivotXType = ABSOLUTE;
private int mPivotYType = ABSOLUTE;
private float mPivotXValue = 0.0f;
private float mPivotYValue = 0.0f;
private float mPivotX;
private float mPivotY;
/**
* Constructor used when a ScaleAnimation is loaded from a resource.
*
* @param context Application context to use
* @param attrs Attribute set from which to read values
*/
public ScaleAnimation(Context context, AttributeSet attrs) {
super(context, attrs);
mResources = context.getResources();
TypedArray a = context.obtainStyledAttributes(attrs,
com.android.internal.R.styleable.ScaleAnimation);
TypedValue tv = a.peekValue(
com.android.internal.R.styleable.ScaleAnimation_fromXScale);
mFromX = 0.0f;
if (tv != null) {
if (tv.type == TypedValue.TYPE_FLOAT) {
// This is a scaling factor.
mFromX = tv.getFloat();
} else {
mFromXType = tv.type;
mFromXData = tv.data;
}
}
tv = a.peekValue(
com.android.internal.R.styleable.ScaleAnimation_toXScale);
mToX = 0.0f;
if (tv != null) {
if (tv.type == TypedValue.TYPE_FLOAT) {
// This is a scaling factor.
mToX = tv.getFloat();
} else {
mToXType = tv.type;
mToXData = tv.data;
}
}
tv = a.peekValue(
com.android.internal.R.styleable.ScaleAnimation_fromYScale);
mFromY = 0.0f;
if (tv != null) {
if (tv.type == TypedValue.TYPE_FLOAT) {
// This is a scaling factor.
mFromY = tv.getFloat();
} else {
mFromYType = tv.type;
mFromYData = tv.data;
}
}
tv = a.peekValue(
com.android.internal.R.styleable.ScaleAnimation_toYScale);
mToY = 0.0f;
if (tv != null) {
if (tv.type == TypedValue.TYPE_FLOAT) {
// This is a scaling factor.
mToY = tv.getFloat();
} else {
mToYType = tv.type;
mToYData = tv.data;
}
}
Description d = Description.parseValue(a.peekValue(
com.android.internal.R.styleable.ScaleAnimation_pivotX));
mPivotXType = d.type;
mPivotXValue = d.value;
d = Description.parseValue(a.peekValue(
com.android.internal.R.styleable.ScaleAnimation_pivotY));
mPivotYType = d.type;
mPivotYValue = d.value;
a.recycle();
initializePivotPoint();
}
/**
* Constructor to use when building a ScaleAnimation from code
*
* @param fromX Horizontal scaling factor to apply at the start of the
* animation
* @param toX Horizontal scaling factor to apply at the end of the animation
* @param fromY Vertical scaling factor to apply at the start of the
* animation
* @param toY Vertical scaling factor to apply at the end of the animation
*/
public ScaleAnimation(float fromX, float toX, float fromY, float toY) {
mResources = null;
mFromX = fromX;
mToX = toX;
mFromY = fromY;
mToY = toY;
mPivotX = 0;
mPivotY = 0;
}
/**
* Constructor to use when building a ScaleAnimation from code
*
* @param fromX Horizontal scaling factor to apply at the start of the
* animation
* @param toX Horizontal scaling factor to apply at the end of the animation
* @param fromY Vertical scaling factor to apply at the start of the
* animation
* @param toY Vertical scaling factor to apply at the end of the animation
* @param 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.)
* @param 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.)
*/
public ScaleAnimation(float fromX, float toX, float fromY, float toY,
float pivotX, float pivotY) {
mResources = null;
mFromX = fromX;
mToX = toX;
mFromY = fromY;
mToY = toY;
mPivotXType = ABSOLUTE;
mPivotYType = ABSOLUTE;
mPivotXValue = pivotX;
mPivotYValue = pivotY;
initializePivotPoint();
}
/**
* Constructor to use when building a ScaleAnimation from code
*
* @param fromX Horizontal scaling factor to apply at the start of the
* animation
* @param toX Horizontal scaling factor to apply at the end of the animation
* @param fromY Vertical scaling factor to apply at the start of the
* animation
* @param toY Vertical scaling factor to apply at the end of the animation
* @param pivotXType Specifies how pivotXValue should be interpreted. One of
* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
* Animation.RELATIVE_TO_PARENT.
* @param 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.
* @param pivotYType Specifies how pivotYValue should be interpreted. One of
* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
* Animation.RELATIVE_TO_PARENT.
* @param 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.
*/
public ScaleAnimation(float fromX, float toX, float fromY, float toY,
int pivotXType, float pivotXValue, int pivotYType, float pivotYValue) {
mResources = null;
mFromX = fromX;
mToX = toX;
mFromY = fromY;
mToY = toY;
mPivotXValue = pivotXValue;
mPivotXType = pivotXType;
mPivotYValue = pivotYValue;
mPivotYType = pivotYType;
initializePivotPoint();
}
/**
* Called at the end of constructor methods to initialize, if possible, values for
* the pivot point. This is only possible for ABSOLUTE pivot values.
*/
private void initializePivotPoint() {
if (mPivotXType == ABSOLUTE) {
mPivotX = mPivotXValue;
}
if (mPivotYType == ABSOLUTE) {
mPivotY = mPivotYValue;
}
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
float sx = 1.0f;
float sy = 1.0f;
float scale = getScaleFactor();
if (mFromX != 1.0f || mToX != 1.0f) {
sx = mFromX + ((mToX - mFromX) * interpolatedTime);
}
if (mFromY != 1.0f || mToY != 1.0f) {
sy = mFromY + ((mToY - mFromY) * interpolatedTime);
}
if (mPivotX == 0 && mPivotY == 0) {
t.getMatrix().setScale(sx, sy);
} else {
t.getMatrix().setScale(sx, sy, scale * mPivotX, scale * mPivotY);
}
}
float resolveScale(float scale, int type, int data, int size, int psize) {
float targetSize;
if (type == TypedValue.TYPE_FRACTION) {
targetSize = TypedValue.complexToFraction(data, size, psize);
} else if (type == TypedValue.TYPE_DIMENSION) {
targetSize = TypedValue.complexToDimension(data, mResources.getDisplayMetrics());
} else {
return scale;
}
if (size == 0) {
return 1;
}
return targetSize/(float)size;
}
@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
mFromX = resolveScale(mFromX, mFromXType, mFromXData, width, parentWidth);
mToX = resolveScale(mToX, mToXType, mToXData, width, parentWidth);
mFromY = resolveScale(mFromY, mFromYType, mFromYData, height, parentHeight);
mToY = resolveScale(mToY, mToYType, mToYData, height, parentHeight);
mPivotX = resolveSize(mPivotXType, mPivotXValue, width, parentWidth);
mPivotY = resolveSize(mPivotYType, mPivotYValue, height, parentHeight);
}
}