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/*
* Copyright (C) 2010 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.gallery3d.ui;
import android.content.Context;
import org.codeaurora.gallery.R;
import com.android.gallery3d.glrenderer.GLCanvas;
import com.android.gallery3d.glrenderer.ResourceTexture;
public class ProgressSpinner {
private static float ROTATE_SPEED_OUTER = 1080f / 3500f;
private static float ROTATE_SPEED_INNER = -720f / 3500f;
private final ResourceTexture mOuter;
private final ResourceTexture mInner;
private final int mWidth;
private final int mHeight;
private float mInnerDegree = 0f;
private float mOuterDegree = 0f;
private long mAnimationTimestamp = -1;
public ProgressSpinner(Context context) {
mOuter = new ResourceTexture(context, R.drawable.spinner_76_outer_holo);
mInner = new ResourceTexture(context, R.drawable.spinner_76_inner_holo);
mWidth = Math.max(mOuter.getWidth(), mInner.getWidth());
mHeight = Math.max(mOuter.getHeight(), mInner.getHeight());
}
public int getWidth() {
return mWidth;
}
public int getHeight() {
return mHeight;
}
public void startAnimation() {
mAnimationTimestamp = -1;
mOuterDegree = 0;
mInnerDegree = 0;
}
public void draw(GLCanvas canvas, int x, int y) {
long now = AnimationTime.get();
if (mAnimationTimestamp == -1) mAnimationTimestamp = now;
mOuterDegree += (now - mAnimationTimestamp) * ROTATE_SPEED_OUTER;
mInnerDegree += (now - mAnimationTimestamp) * ROTATE_SPEED_INNER;
mAnimationTimestamp = now;
// just preventing overflow
if (mOuterDegree > 360) mOuterDegree -= 360f;
if (mInnerDegree < 0) mInnerDegree += 360f;
canvas.save(GLCanvas.SAVE_FLAG_MATRIX);
canvas.translate(x + mWidth / 2, y + mHeight / 2);
canvas.rotate(mInnerDegree, 0, 0, 1);
mOuter.draw(canvas, -mOuter.getWidth() / 2, -mOuter.getHeight() / 2);
canvas.rotate(mOuterDegree - mInnerDegree, 0, 0, 1);
mInner.draw(canvas, -mInner.getWidth() / 2, -mInner.getHeight() / 2);
canvas.restore();
}
}