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
17package com.android.gallery3d.ui;
18
19import android.content.Context;
20
21import com.android.gallery3d.R;
22import com.android.gallery3d.glrenderer.GLCanvas;
23import com.android.gallery3d.glrenderer.ResourceTexture;
24
25public class ProgressSpinner {
26    private static float ROTATE_SPEED_OUTER = 1080f / 3500f;
27    private static float ROTATE_SPEED_INNER = -720f / 3500f;
28    private final ResourceTexture mOuter;
29    private final ResourceTexture mInner;
30    private final int mWidth;
31    private final int mHeight;
32
33    private float mInnerDegree = 0f;
34    private float mOuterDegree = 0f;
35    private long mAnimationTimestamp = -1;
36
37    public ProgressSpinner(Context context) {
38        mOuter = new ResourceTexture(context, R.drawable.spinner_76_outer_holo);
39        mInner = new ResourceTexture(context, R.drawable.spinner_76_inner_holo);
40
41        mWidth = Math.max(mOuter.getWidth(), mInner.getWidth());
42        mHeight = Math.max(mOuter.getHeight(), mInner.getHeight());
43    }
44
45    public int getWidth() {
46        return mWidth;
47    }
48
49    public int getHeight() {
50        return mHeight;
51    }
52
53    public void startAnimation() {
54        mAnimationTimestamp = -1;
55        mOuterDegree = 0;
56        mInnerDegree = 0;
57    }
58
59    public void draw(GLCanvas canvas, int x, int y) {
60        long now = AnimationTime.get();
61        if (mAnimationTimestamp == -1) mAnimationTimestamp = now;
62        mOuterDegree += (now - mAnimationTimestamp) * ROTATE_SPEED_OUTER;
63        mInnerDegree += (now - mAnimationTimestamp) * ROTATE_SPEED_INNER;
64
65        mAnimationTimestamp = now;
66
67        // just preventing overflow
68        if (mOuterDegree > 360) mOuterDegree -= 360f;
69        if (mInnerDegree < 0) mInnerDegree += 360f;
70
71        canvas.save(GLCanvas.SAVE_FLAG_MATRIX);
72
73        canvas.translate(x + mWidth / 2, y + mHeight / 2);
74        canvas.rotate(mInnerDegree, 0, 0, 1);
75        mOuter.draw(canvas, -mOuter.getWidth() / 2, -mOuter.getHeight() / 2);
76        canvas.rotate(mOuterDegree - mInnerDegree, 0, 0, 1);
77        mInner.draw(canvas, -mInner.getWidth() / 2, -mInner.getHeight() / 2);
78        canvas.restore();
79    }
80}
81