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/*
* 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.photoeditor.actions;
import android.content.Context;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
/**
* Full-screen tool view that gets photo display bounds and maps positions on photo display bounds
* back to exact coordinates on photo.
*/
abstract class FullscreenToolView extends View {
protected final RectF displayBounds = new RectF();
private final Matrix photoMatrix = new Matrix();
private RectF photoBounds;
public FullscreenToolView(Context context, AttributeSet attrs) {
super(context, attrs);
}
/**
* Photo bounds must be set before onSizeChanged() and all other instance methods are invoked.
*/
public void setPhotoBounds(RectF photoBounds) {
this.photoBounds = photoBounds;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
displayBounds.setEmpty();
photoMatrix.reset();
if (photoBounds.isEmpty()) {
return;
}
// Assumes photo-view is also full-screen as this tool-view and centers/scales photo to fit.
Matrix matrix = new Matrix();
if (matrix.setRectToRect(photoBounds, new RectF(0, 0, w, h), Matrix.ScaleToFit.CENTER)) {
matrix.mapRect(displayBounds, photoBounds);
}
matrix.invert(photoMatrix);
}
protected float getPhotoWidth() {
return photoBounds.width();
}
protected float getPhotoHeight() {
return photoBounds.height();
}
protected void mapPhotoPoint(float x, float y, PointF dst) {
if (photoBounds.isEmpty()) {
dst.set(0, 0);
} else {
float[] point = new float[] {x, y};
photoMatrix.mapPoints(point);
dst.set(point[0] / photoBounds.width(), point[1] / photoBounds.height());
}
}
protected void mapPhotoRect(RectF src, RectF dst) {
if (photoBounds.isEmpty()) {
dst.setEmpty();
} else {
photoMatrix.mapRect(dst, src);
dst.set(dst.left / photoBounds.width(), dst.top / photoBounds.height(),
dst.right / photoBounds.width(), dst.bottom / photoBounds.height());
}
}
}
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