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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.gallery3d.ui;
     18 
     19 import com.android.gallery3d.R;
     20 
     21 import android.content.Context;
     22 
     23 public class ProgressSpinner {
     24     private static float ROTATE_SPEED_OUTER = 1080f / 3500f;
     25     private static float ROTATE_SPEED_INNER = -720f / 3500f;
     26     private final ResourceTexture mOuter;
     27     private final ResourceTexture mInner;
     28     private final int mWidth;
     29     private final int mHeight;
     30 
     31     private float mInnerDegree = 0f;
     32     private float mOuterDegree = 0f;
     33     private long mAnimationTimestamp = -1;
     34 
     35     public ProgressSpinner(Context context) {
     36         mOuter = new ResourceTexture(context, R.drawable.spinner_76_outer_holo);
     37         mInner = new ResourceTexture(context, R.drawable.spinner_76_inner_holo);
     38 
     39         mWidth = Math.max(mOuter.getWidth(), mInner.getWidth());
     40         mHeight = Math.max(mOuter.getHeight(), mInner.getHeight());
     41     }
     42 
     43     public int getWidth() {
     44         return mWidth;
     45     }
     46 
     47     public int getHeight() {
     48         return mHeight;
     49     }
     50 
     51     public void startAnimation() {
     52         mAnimationTimestamp = -1;
     53         mOuterDegree = 0;
     54         mInnerDegree = 0;
     55     }
     56 
     57     public void draw(GLCanvas canvas, int x, int y) {
     58         long now = canvas.currentAnimationTimeMillis();
     59         if (mAnimationTimestamp == -1) mAnimationTimestamp = now;
     60         mOuterDegree += (now - mAnimationTimestamp) * ROTATE_SPEED_OUTER;
     61         mInnerDegree += (now - mAnimationTimestamp) * ROTATE_SPEED_INNER;
     62 
     63         mAnimationTimestamp = now;
     64 
     65         // just preventing overflow
     66         if (mOuterDegree > 360) mOuterDegree -= 360f;
     67         if (mInnerDegree < 0) mInnerDegree += 360f;
     68 
     69         canvas.save(GLCanvas.SAVE_FLAG_MATRIX);
     70 
     71         canvas.translate(x + mWidth / 2, y + mHeight / 2, 0);
     72         canvas.rotate(mInnerDegree, 0, 0, 1);
     73         mOuter.draw(canvas, -mOuter.getWidth() / 2, -mOuter.getHeight() / 2);
     74         canvas.rotate(mOuterDegree - mInnerDegree, 0, 0, 1);
     75         mInner.draw(canvas, -mInner.getWidth() / 2, -mInner.getHeight() / 2);
     76         canvas.restore();
     77     }
     78 }
     79