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Diffstat (limited to 'src/com/android/gallery3d/util/MotionEventHelper.java')
-rw-r--r-- | src/com/android/gallery3d/util/MotionEventHelper.java | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/src/com/android/gallery3d/util/MotionEventHelper.java b/src/com/android/gallery3d/util/MotionEventHelper.java deleted file mode 100644 index 715f7fa69..000000000 --- a/src/com/android/gallery3d/util/MotionEventHelper.java +++ /dev/null @@ -1,120 +0,0 @@ -/* - * Copyright (C) 2012 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.util; - -import android.annotation.TargetApi; -import android.graphics.Matrix; -import android.util.FloatMath; -import android.view.MotionEvent; -import android.view.MotionEvent.PointerCoords; - -import com.android.gallery3d.common.ApiHelper; - -public final class MotionEventHelper { - private MotionEventHelper() {} - - public static MotionEvent transformEvent(MotionEvent e, Matrix m) { - // We try to use the new transform method if possible because it uses - // less memory. - if (ApiHelper.HAS_MOTION_EVENT_TRANSFORM) { - return transformEventNew(e, m); - } else { - return transformEventOld(e, m); - } - } - - @TargetApi(ApiHelper.VERSION_CODES.HONEYCOMB) - private static MotionEvent transformEventNew(MotionEvent e, Matrix m) { - MotionEvent newEvent = MotionEvent.obtain(e); - newEvent.transform(m); - return newEvent; - } - - // This is copied from Input.cpp in the android framework. - private static MotionEvent transformEventOld(MotionEvent e, Matrix m) { - long downTime = e.getDownTime(); - long eventTime = e.getEventTime(); - int action = e.getAction(); - int pointerCount = e.getPointerCount(); - int[] pointerIds = getPointerIds(e); - PointerCoords[] pointerCoords = getPointerCoords(e); - int metaState = e.getMetaState(); - float xPrecision = e.getXPrecision(); - float yPrecision = e.getYPrecision(); - int deviceId = e.getDeviceId(); - int edgeFlags = e.getEdgeFlags(); - int source = e.getSource(); - int flags = e.getFlags(); - - // Copy the x and y coordinates into an array, map them, and copy back. - float[] xy = new float[pointerCoords.length * 2]; - for (int i = 0; i < pointerCount;i++) { - xy[2 * i] = pointerCoords[i].x; - xy[2 * i + 1] = pointerCoords[i].y; - } - m.mapPoints(xy); - for (int i = 0; i < pointerCount;i++) { - pointerCoords[i].x = xy[2 * i]; - pointerCoords[i].y = xy[2 * i + 1]; - pointerCoords[i].orientation = transformAngle( - m, pointerCoords[i].orientation); - } - - MotionEvent n = MotionEvent.obtain(downTime, eventTime, action, - pointerCount, pointerIds, pointerCoords, metaState, xPrecision, - yPrecision, deviceId, edgeFlags, source, flags); - - return n; - } - - private static int[] getPointerIds(MotionEvent e) { - int n = e.getPointerCount(); - int[] r = new int[n]; - for (int i = 0; i < n; i++) { - r[i] = e.getPointerId(i); - } - return r; - } - - private static PointerCoords[] getPointerCoords(MotionEvent e) { - int n = e.getPointerCount(); - PointerCoords[] r = new PointerCoords[n]; - for (int i = 0; i < n; i++) { - r[i] = new PointerCoords(); - e.getPointerCoords(i, r[i]); - } - return r; - } - - private static float transformAngle(Matrix m, float angleRadians) { - // Construct and transform a vector oriented at the specified clockwise - // angle from vertical. Coordinate system: down is increasing Y, right is - // increasing X. - float[] v = new float[2]; - v[0] = FloatMath.sin(angleRadians); - v[1] = -FloatMath.cos(angleRadians); - m.mapVectors(v); - - // Derive the transformed vector's clockwise angle from vertical. - float result = (float) Math.atan2(v[0], -v[1]); - if (result < -Math.PI / 2) { - result += Math.PI; - } else if (result > Math.PI / 2) { - result -= Math.PI; - } - return result; - } -} |