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/*
* Copyright (C) 2009 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;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
/**
* A @{code ImageView} which can rotate it's content.
*/
public class RotateImageView extends ImageView {
@SuppressWarnings("unused")
private static final String TAG = "RotateImageView";
private static final int ANIMATION_SPEED = 180; // 180 deg/sec
private int mCurrentDegree = 0; // [0, 359]
private int mStartDegree = 0;
private int mTargetDegree = 0;
private boolean mClockwise = false;
private long mAnimationStartTime = 0;
private long mAnimationEndTime = 0;
public RotateImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void setDegree(int degree) {
// make sure in the range of [0, 359]
degree = degree >= 0 ? degree % 360 : degree % 360 + 360;
if (degree == mTargetDegree) return;
mTargetDegree = degree;
mStartDegree = mCurrentDegree;
mAnimationStartTime = AnimationUtils.currentAnimationTimeMillis();
int diff = mTargetDegree - mCurrentDegree;
diff = diff >= 0 ? diff : 360 + diff; // make it in range [0, 359]
// Make it in range [-179, 180]. That's the shorted distance between the
// two angles
diff = diff > 180 ? diff - 360 : diff;
mClockwise = diff >= 0;
mAnimationEndTime = mAnimationStartTime
+ Math.abs(diff) * 1000 / ANIMATION_SPEED;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if (drawable == null) return;
Rect bounds = drawable.getBounds();
int w = bounds.right - bounds.left;
int h = bounds.bottom - bounds.top;
if (w == 0 || h == 0) return; // nothing to draw
if (mCurrentDegree != mTargetDegree) {
long time = AnimationUtils.currentAnimationTimeMillis();
if (time < mAnimationEndTime) {
int deltaTime = (int)(time - mAnimationStartTime);
int degree = mStartDegree + ANIMATION_SPEED
* (mClockwise ? deltaTime : -deltaTime) / 1000;
degree = degree >= 0 ? degree % 360 : degree % 360 + 360;
mCurrentDegree = degree;
invalidate();
} else {
mCurrentDegree = mTargetDegree;
}
}
int saveCount = canvas.getSaveCount();
canvas.translate(getPaddingLeft(), getPaddingTop());
canvas.rotate(-mCurrentDegree, w / 2, h / 2);
drawable.draw(canvas);
canvas.restoreToCount(saveCount);
}
}
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