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/*
* Copyright (C) 2013 The CyanogenMod 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 org.cyanogenmod.wallpapers.photophase.transitions;
import android.content.Context;
import android.opengl.GLException;
import android.os.SystemClock;
import org.cyanogenmod.wallpapers.photophase.Colors;
import org.cyanogenmod.wallpapers.photophase.PhotoFrame;
import org.cyanogenmod.wallpapers.photophase.TextureManager;
import org.cyanogenmod.wallpapers.photophase.shapes.ColorShape;
import org.cyanogenmod.wallpapers.photophase.transitions.Transitions.TRANSITIONS;
/**
* A transition that applies a fade transition to the picture.
*/
public class FadeTransition extends NullTransition {
private static final float TRANSITION_TIME = 600.0f;
private boolean mRunning;
private long mTime;
ColorShape mOverlay;
/**
* Constructor of <code>FadeTransition</code>
*
* @param ctx The current context
* @param tm The texture manager
*/
public FadeTransition(Context ctx, TextureManager tm) {
super(ctx, tm);
}
/**
* {@inheritDoc}
*/
@Override
public TRANSITIONS getType() {
return TRANSITIONS.FADE;
}
/**
* {@inheritDoc}
*/
@Override
public boolean hasTransitionTarget() {
return true;
}
/**
* {@inheritDoc}
*/
@Override
public boolean isRunning() {
return mRunning;
}
/**
* {@inheritDoc}
*/
@Override
public void reset() {
super.reset();
mTime = -1;
mRunning = true;
}
/**
* {@inheritDoc}
*/
@Override
public void select(PhotoFrame target) {
super.select(target);
mOverlay = new ColorShape(mContext, target.getFrameVertex(), Colors.getBackground());
mOverlay.setAlpha(0);
}
/**
* {@inheritDoc}
*/
@Override
public void apply(float[] matrix) throws GLException {
// Check internal vars
if (mTarget == null ||
mTarget.getPositionBuffer() == null ||
mTarget.getTextureBuffer() == null) {
return;
}
if (mTransitionTarget == null ||
mTransitionTarget.getPositionBuffer() == null ||
mTransitionTarget.getTextureBuffer() == null) {
return;
}
// Set the time the first time
if (mTime == -1) {
mTime = SystemClock.uptimeMillis();
}
final float delta = Math.min(SystemClock.uptimeMillis() - mTime, TRANSITION_TIME) / TRANSITION_TIME;
if (delta <= 0.5) {
// Draw the src target
draw(mTarget, matrix);
mOverlay.setAlpha(delta * 2.0f);
} else {
// Draw the dst target
draw(mTransitionTarget, matrix);
mOverlay.setAlpha((1 - delta) * 2.0f);
}
mOverlay.draw(matrix);
// Transition ended
if (delta == 1) {
mRunning = false;
}
}
}
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