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/*
* 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.filtershow.imageshow;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.MotionEvent;
import com.android.gallery3d.filtershow.cache.ImageLoader;
public class ImageZoom extends ImageSlave {
private static final String LOGTAG = "ImageZoom";
private boolean mTouchDown = false;
private boolean mZoomedIn = false;
private Rect mZoomBounds = null;
private static float mMaxSize = 512;
public ImageZoom(Context context) {
super(context);
}
public ImageZoom(Context context, AttributeSet attrs) {
super(context, attrs);
}
public static void setZoomedSize(float size) {
mMaxSize = size;
}
@Override
public void resetParameter() {
super.resetParameter();
mZoomedIn = false;
mTouchDown = false;
}
@Override
public void onTouchDown(float x, float y) {
super.onTouchDown(x, y);
if (mZoomedIn || mTouchDown) {
return;
}
mTouchDown = true;
GeometryMetadata geo = getImagePreset().mGeoData;
Matrix originalToScreen = geo.getOriginalToScreen(true,
mImageLoader.getOriginalBounds().width(),
mImageLoader.getOriginalBounds().height(),
getWidth(), getHeight());
float[] point = new float[2];
point[0] = x;
point[1] = y;
Matrix inverse = new Matrix();
originalToScreen.invert(inverse);
inverse.mapPoints(point);
float ratio = (float) getWidth() / (float) getHeight();
float mh = mMaxSize;
float mw = ratio * mh;
RectF zoomRect = new RectF(mTouchX - mw, mTouchY - mh, mTouchX + mw, mTouchY + mw);
inverse.mapRect(zoomRect);
zoomRect.set(zoomRect.centerX() - mw, zoomRect.centerY() - mh,
zoomRect.centerX() + mw, zoomRect.centerY() + mh);
mZoomBounds = new Rect((int) zoomRect.left, (int) zoomRect.top,
(int) zoomRect.right, (int) zoomRect.bottom);
invalidate();
}
@Override
public void onTouchUp() {
mTouchDown = false;
}
@Override
public void onDraw(Canvas canvas) {
drawBackground(canvas);
Bitmap filteredImage = null;
if ((mZoomedIn || mTouchDown) && mImageLoader != null) {
filteredImage = mImageLoader.getScaleOneImageForPreset(this, getImagePreset(),
mZoomBounds, false);
} else {
requestFilteredImages();
filteredImage = getFilteredImage();
}
canvas.save();
if (mZoomedIn || mTouchDown) {
int orientation = ImageLoader.getZoomOrientation();
switch (orientation) {
case ImageLoader.ORI_ROTATE_90: {
canvas.rotate(90, getWidth() / 2, getHeight() / 2);
break;
}
case ImageLoader.ORI_ROTATE_270: {
canvas.rotate(270, getWidth() / 2, getHeight() / 2);
break;
}
case ImageLoader.ORI_TRANSPOSE: {
canvas.rotate(90, getWidth() / 2, getHeight() / 2);
canvas.scale(1, -1);
break;
}
case ImageLoader.ORI_TRANSVERSE: {
canvas.rotate(270, getWidth() / 2, getHeight() / 2);
canvas.scale(1, -1);
break;
}
}
}
drawImage(canvas, filteredImage);
canvas.restore();
if (showControls()) {
mSliderController.onDraw(canvas);
}
drawToast(canvas);
}
@Override
public boolean onDoubleTap(MotionEvent event) {
if (!mZoomedIn) {
onTouchDown(event.getX(), event.getY());
} else {
onTouchUp();
}
mZoomedIn = !mZoomedIn;
invalidate();
return false;
}
}
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