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Diffstat (limited to 'src/com/android/gallery3d/ui/Paper.java')
| -rw-r--r-- | src/com/android/gallery3d/ui/Paper.java | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/src/com/android/gallery3d/ui/Paper.java b/src/com/android/gallery3d/ui/Paper.java deleted file mode 100644 index b36f5c3a2..000000000 --- a/src/com/android/gallery3d/ui/Paper.java +++ /dev/null @@ -1,183 +0,0 @@ -/* - * 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.graphics.Rect; -import android.opengl.Matrix; -import android.view.animation.DecelerateInterpolator; -import android.view.animation.Interpolator; - -import com.android.gallery3d.common.Utils; - -// This class does the overscroll effect. -class Paper { - @SuppressWarnings("unused") - private static final String TAG = "Paper"; - private static final int ROTATE_FACTOR = 4; - private EdgeAnimation mAnimationLeft = new EdgeAnimation(); - private EdgeAnimation mAnimationRight = new EdgeAnimation(); - private int mWidth; - private float[] mMatrix = new float[16]; - - public void overScroll(float distance) { - distance /= mWidth; // make it relative to width - if (distance < 0) { - mAnimationLeft.onPull(-distance); - } else { - mAnimationRight.onPull(distance); - } - } - - public void edgeReached(float velocity) { - velocity /= mWidth; // make it relative to width - if (velocity < 0) { - mAnimationRight.onAbsorb(-velocity); - } else { - mAnimationLeft.onAbsorb(velocity); - } - } - - public void onRelease() { - mAnimationLeft.onRelease(); - mAnimationRight.onRelease(); - } - - public boolean advanceAnimation() { - // Note that we use "|" because we want both animations get updated. - return mAnimationLeft.update() | mAnimationRight.update(); - } - - public void setSize(int width, int height) { - mWidth = width; - } - - public float[] getTransform(Rect rect, float scrollX) { - float left = mAnimationLeft.getValue(); - float right = mAnimationRight.getValue(); - float screenX = rect.centerX() - scrollX; - // We linearly interpolate the value [left, right] for the screenX - // range int [-1/4, 5/4]*mWidth. So if part of the thumbnail is outside - // the screen, we still get some transform. - float x = screenX + mWidth / 4; - int range = 3 * mWidth / 2; - float t = ((range - x) * left - x * right) / range; - // compress t to the range (-1, 1) by the function - // f(t) = (1 / (1 + e^-t) - 0.5) * 2 - // then multiply by 90 to make the range (-45, 45) - float degrees = - (1 / (1 + (float) Math.exp(-t * ROTATE_FACTOR)) - 0.5f) * 2 * -45; - Matrix.setIdentityM(mMatrix, 0); - Matrix.translateM(mMatrix, 0, mMatrix, 0, rect.centerX(), rect.centerY(), 0); - Matrix.rotateM(mMatrix, 0, degrees, 0, 1, 0); - Matrix.translateM(mMatrix, 0, mMatrix, 0, -rect.width() / 2, -rect.height() / 2, 0); - return mMatrix; - } -} - -// This class follows the structure of frameworks's EdgeEffect class. -class EdgeAnimation { - @SuppressWarnings("unused") - private static final String TAG = "EdgeAnimation"; - - private static final int STATE_IDLE = 0; - private static final int STATE_PULL = 1; - private static final int STATE_ABSORB = 2; - private static final int STATE_RELEASE = 3; - - // Time it will take the effect to fully done in ms - private static final int ABSORB_TIME = 200; - private static final int RELEASE_TIME = 500; - - private static final float VELOCITY_FACTOR = 0.1f; - - private final Interpolator mInterpolator; - - private int mState; - private float mValue; - - private float mValueStart; - private float mValueFinish; - private long mStartTime; - private long mDuration; - - public EdgeAnimation() { - mInterpolator = new DecelerateInterpolator(); - mState = STATE_IDLE; - } - - private void startAnimation(float start, float finish, long duration, - int newState) { - mValueStart = start; - mValueFinish = finish; - mDuration = duration; - mStartTime = now(); - mState = newState; - } - - // The deltaDistance's magnitude is in the range of -1 (no change) to 1. - // The value 1 is the full length of the view. Negative values means the - // movement is in the opposite direction. - public void onPull(float deltaDistance) { - if (mState == STATE_ABSORB) return; - mValue = Utils.clamp(mValue + deltaDistance, -1.0f, 1.0f); - mState = STATE_PULL; - } - - public void onRelease() { - if (mState == STATE_IDLE || mState == STATE_ABSORB) return; - startAnimation(mValue, 0, RELEASE_TIME, STATE_RELEASE); - } - - public void onAbsorb(float velocity) { - float finish = Utils.clamp(mValue + velocity * VELOCITY_FACTOR, - -1.0f, 1.0f); - startAnimation(mValue, finish, ABSORB_TIME, STATE_ABSORB); - } - - public boolean update() { - if (mState == STATE_IDLE) return false; - if (mState == STATE_PULL) return true; - - float t = Utils.clamp((float)(now() - mStartTime) / mDuration, 0.0f, 1.0f); - /* Use linear interpolation for absorb, quadratic for others */ - float interp = (mState == STATE_ABSORB) - ? t : mInterpolator.getInterpolation(t); - - mValue = mValueStart + (mValueFinish - mValueStart) * interp; - - if (t >= 1.0f) { - switch (mState) { - case STATE_ABSORB: - startAnimation(mValue, 0, RELEASE_TIME, STATE_RELEASE); - break; - case STATE_RELEASE: - mState = STATE_IDLE; - break; - } - } - - return true; - } - - public float getValue() { - return mValue; - } - - private long now() { - return AnimationTime.get(); - } -} |