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/*
* Copyright (C) 2014 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 com.android.camera.ui.focus;
import android.graphics.Canvas;
import android.graphics.Paint;
import com.android.camera.ui.motion.InterpolateUtils;
import com.android.camera.ui.motion.Invalidator;
/**
* Manual focus ring animation renderer.
*/
class ManualFocusRing extends FocusRingRenderer {
/**
* The manual focus ring encapsulates the animation logic for visualizing
* a focus event when triggered by a physical screen touch.
*
* @param invalidator the object to invalidate while running.
* @param ringPaint the paint to draw the ring with.
* @param exitDurationMillis the fade out time in milliseconds.
*/
public ManualFocusRing(Invalidator invalidator, Paint ringPaint,
float exitDurationMillis) {
super(invalidator, ringPaint, 0.0f, exitDurationMillis);
}
@Override
public void draw(long t, long dt, Canvas canvas) {
float ringRadius = mRingRadius.update(dt);
processStates(t);
if (!isActive()) {
return;
}
mInvalidator.invalidate();
int ringAlpha = 255;
if (mFocusState == FocusState.STATE_FADE_OUT) {
float rFade = InterpolateUtils.unitRatio(t, mExitStartMillis, mExitDurationMillis);
ringAlpha = (int) InterpolateUtils.lerp(255, 0, mExitOpacityCurve.valueAt(rFade));
} else if (mFocusState == FocusState.STATE_HARD_STOP) {
float rFade = InterpolateUtils.unitRatio(t, mHardExitStartMillis,
mHardExitDurationMillis);
ringAlpha = (int) InterpolateUtils.lerp(255, 0, mExitOpacityCurve.valueAt(rFade));
} else if (mFocusState == FocusState.STATE_INACTIVE) {
ringAlpha = 0;
}
mRingPaint.setAlpha(ringAlpha);
canvas.drawCircle(getCenterX(), getCenterY(), ringRadius, mRingPaint);
}
private void processStates(long t) {
if (mFocusState == FocusState.STATE_INACTIVE) {
return;
}
if (mFocusState == FocusState.STATE_ENTER
&& (t > mEnterStartMillis + mEnterDurationMillis)) {
mFocusState = FocusState.STATE_ACTIVE;
}
if (mFocusState == FocusState.STATE_ACTIVE && !mRingRadius.isActive()) {
mFocusState = FocusState.STATE_FADE_OUT;
mExitStartMillis = t;
}
if (mFocusState == FocusState.STATE_FADE_OUT && t > mExitStartMillis + mExitDurationMillis) {
mFocusState = FocusState.STATE_INACTIVE;
}
if (mFocusState == FocusState.STATE_HARD_STOP
&& t > mHardExitStartMillis + mHardExitDurationMillis) {
mFocusState = FocusState.STATE_INACTIVE;
}
}
}
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