/*
* Copyright (C) 2015 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.graphics.Matrix;
/**
* Special case of TranslateAnimation that translates only vertically, picking up the
* horizontal values from whatever is set on the Transformation already. When used in
* conjunction with a TranslateXAnimation, allows independent animation of x and y
* position.
* @hide
*/
public class TranslateYAnimation extends TranslateAnimation {
float[] mTmpValues = new float[9];
/**
* Constructor. Passes in 0 for the x parameters of TranslateAnimation
*/
public TranslateYAnimation(float fromYDelta, float toYDelta) {
super(0, 0, fromYDelta, toYDelta);
}
/**
* Constructor. Passes in 0 for the x parameters of TranslateAnimation
*/
public TranslateYAnimation(int fromYType, float fromYValue, int toYType, float toYValue) {
super(ABSOLUTE, 0, ABSOLUTE, 0, fromYType, fromYValue, toYType, toYValue);
}
/**
* Calculates and sets y translation values on given transformation.
*/
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
Matrix m = t.getMatrix();
m.getValues(mTmpValues);
float dy = mFromYDelta + ((mToYDelta - mFromYDelta) * interpolatedTime);
t.getMatrix().setTranslate(mTmpValues[Matrix.MTRANS_X], dy);
}
}