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 android.content.Context; 20 21 import com.android.gallery3d.R; 22 import com.android.gallery3d.glrenderer.GLCanvas; 23 import com.android.gallery3d.glrenderer.ResourceTexture; 24 25 public 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 ProgressSpinner(Context context)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 getWidth()45 public int getWidth() { 46 return mWidth; 47 } 48 getHeight()49 public int getHeight() { 50 return mHeight; 51 } 52 startAnimation()53 public void startAnimation() { 54 mAnimationTimestamp = -1; 55 mOuterDegree = 0; 56 mInnerDegree = 0; 57 } 58 draw(GLCanvas canvas, int x, int y)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