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/*
* Copyright (C) 2013 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.filtershow.crop;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import com.android.gallery3d.R;
public class CropView extends View {
private static final String LOGTAG = "CropView";
Bitmap mImage = null;
CropObject mCropObj = null;
private final Drawable mCropIndicator;
private final int mIndicatorSize;
private float mPrevX = 0;
private float mPrevY = 0;
private int mMinSideSize = 45;
private int mTouchTolerance = 20;
private boolean mMovingBlock = false;
private Matrix mDisplayMatrix = null;
private Matrix mDisplayMatrixInverse = null;
private enum Mode {
NONE, MOVE
}
private Mode mState = Mode.NONE;
public CropView(Context context, AttributeSet attrs) {
super(context, attrs);
Resources resources = context.getResources();
mCropIndicator = resources.getDrawable(R.drawable.camera_crop);
mIndicatorSize = (int) resources.getDimension(R.dimen.crop_indicator_size);
}
// For unchanging parameters
public void setup(Bitmap image, int minSideSize, int touchTolerance) {
mImage = image;
mMinSideSize = minSideSize;
mTouchTolerance = touchTolerance;
reset();
}
@Override
public void onDraw(Canvas canvas) {
if (mImage == null) {
return;
}
int displayWidth = getWidth();
int displayHeight = getHeight();
Rect imageBoundsOriginal = new Rect(0, 0, mImage.getWidth(), mImage.getHeight());
Rect displayBoundsOriginal = new Rect(0, 0, displayWidth, displayHeight);
if (mCropObj == null) {
reset();
mCropObj = new CropObject(imageBoundsOriginal, imageBoundsOriginal, 0);
}
RectF imageBounds = mCropObj.getInnerBounds();
RectF displayBounds = mCropObj.getOuterBounds();
// If display matrix doesn't exist, create it and its dependencies
if (mDisplayMatrix == null || mDisplayMatrixInverse == null) {
mDisplayMatrix = CropDrawingUtils.getBitmapToDisplayMatrix(displayBounds, new RectF(
displayBoundsOriginal));
mDisplayMatrixInverse = new Matrix();
mDisplayMatrixInverse.reset();
if (!mDisplayMatrix.invert(mDisplayMatrixInverse)) {
Log.w(LOGTAG, "could not invert display matrix");
}
// Scale min side and tolerance by display matrix scale factor
mCropObj.setMinInnerSideSize(mDisplayMatrixInverse.mapRadius(mMinSideSize));
mCropObj.setTouchTolerance(mDisplayMatrixInverse.mapRadius(mTouchTolerance));
}
canvas.drawBitmap(mImage, mDisplayMatrix, new Paint());
if (mDisplayMatrix.mapRect(imageBounds)) {
CropDrawingUtils.drawCropRect(canvas, imageBounds);
CropDrawingUtils.drawRuleOfThird(canvas, imageBounds);
CropDrawingUtils.drawIndicators(canvas, mCropIndicator, mIndicatorSize, imageBounds,
mCropObj.isFixedAspect(), mCropObj.getSelectState());
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
if (mDisplayMatrix == null || mDisplayMatrixInverse == null) {
return true;
}
float[] touchPoint = {
x, y
};
mDisplayMatrixInverse.mapPoints(touchPoint);
x = touchPoint[0];
y = touchPoint[1];
switch (event.getActionMasked()) {
case (MotionEvent.ACTION_DOWN):
if (mState == Mode.NONE) {
if (!mCropObj.selectEdge(x, y)) {
mMovingBlock = mCropObj.selectEdge(CropObject.MOVE_BLOCK);
}
mPrevX = x;
mPrevY = y;
mState = Mode.MOVE;
} else {
reset();
}
break;
case (MotionEvent.ACTION_UP):
if (mState == Mode.MOVE) {
mCropObj.selectEdge(CropObject.MOVE_NONE);
mMovingBlock = false;
mPrevX = x;
mPrevY = y;
mState = Mode.NONE;
} else {
reset();
}
break;
case (MotionEvent.ACTION_MOVE):
if (mState == Mode.MOVE) {
float dx = x - mPrevX;
float dy = y - mPrevY;
mCropObj.moveCurrentSelection(dx, dy);
mPrevX = x;
mPrevY = y;
} else {
reset();
}
break;
default:
reset();
break;
}
invalidate();
return true;
}
public void reset() {
Log.w(LOGTAG, "reset called");
mState = Mode.NONE;
mCropObj = null;
mDisplayMatrix = null;
mDisplayMatrixInverse = null;
mMovingBlock = false;
invalidate();
}
public boolean getCropBounds(RectF out_crop, RectF in_newContaining) {
Matrix m = new Matrix();
RectF inner = mCropObj.getInnerBounds();
RectF outer = mCropObj.getOuterBounds();
if (!m.setRectToRect(outer, in_newContaining, Matrix.ScaleToFit.FILL)) {
Log.w(LOGTAG, "failed to make transform matrix");
return false;
}
if (!m.mapRect(inner)) {
Log.w(LOGTAG, "failed to transform crop bounds");
return false;
}
out_crop.set(inner);
return true;
}
}
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