49 lines
1.4 KiB
Java
49 lines
1.4 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.hippo.glview.anim;
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import com.hippo.glview.glrenderer.GLCanvas;
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import com.hippo.yorozuya.MathUtils;
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public class AlphaAnimation extends CanvasAnimation {
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private final float mStartAlpha;
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private final float mEndAlpha;
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private float mCurrentAlpha;
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public AlphaAnimation(float from, float to) {
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mStartAlpha = from;
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mEndAlpha = to;
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mCurrentAlpha = from;
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}
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@Override
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public void apply(GLCanvas canvas) {
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canvas.multiplyAlpha(mCurrentAlpha);
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}
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@Override
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public int getCanvasSaveFlags() {
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return GLCanvas.SAVE_FLAG_ALPHA;
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}
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@Override
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protected void onCalculate(float progress) {
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mCurrentAlpha = MathUtils.clamp(mStartAlpha +
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(mEndAlpha - mStartAlpha) * progress, 0f, 1f);
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}
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}
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