ViewAnimation3.java

/*
 * Copyright (C) 2007 Google Inc.
 *
 * 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 com.google.mcommerce.sample.android.chapter13.view;

import android.graphics.Matrix;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.Transformation;

public class ViewAnimation3 extends Animation {
	float centerX, centerY;

	public ViewAnimation3() {
	}

	@Override
	public void initialize(int width, int height, int parentWidth,
			int parentHeight) {
		super.initialize(width, height, parentWidth, parentHeight);
		centerX = width / 2.0f;
		centerY = height / 2.0f;
		setDuration(2500);
		setFillAfter(true);
		setInterpolator(new LinearInterpolator());
	}

	@Override
	protected void applyTransformation(float interpolatedTime, Transformation t) {
		final Matrix matrix = t.getMatrix();
		matrix.setScale(interpolatedTime, interpolatedTime);
		matrix.preTranslate(-centerX, -centerY);
		matrix.postTranslate(centerX, centerY);
	}
}