/***************************************************************************

* QGeoView is a Qt / C ++ widget for visualizing geographic data.

* Copyright (C) 2018-2025 Andrey Yaroshenko.

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public License

* along with this program; if not, see https://www.gnu.org/licenses.

****************************************************************************/

#include "QGVWidgetZoom.h"

#include <QHBoxLayout>

#include <QIcon>

#include <QImage>

#include <QPainter>

#include <QVBoxLayout>

#include <QtMath>

namespace {

QSize iconSize = QSize(24, 24);

double zoomExponentDown = qPow(2, 1.0 / 5.0);

double zoomExponentUp = 1.0 / qPow(2, 1.0 / 5.0);

}

QGVWidgetZoom::QGVWidgetZoom()

{

mButtonPlus.reset(new QToolButton());

mButtonPlus->setAutoRepeat(true);

mButtonPlus->setIconSize(iconSize);

mButtonPlus->setToolButtonStyle(Qt::ToolButtonIconOnly);

mButtonPlus->setIcon(QIcon(createPixmap(iconSize * 0.75, "+")));

connect(mButtonPlus.data(), &QToolButton::clicked, this, &QGVWidgetZoom::zoomPlus);

mButtonMinus.reset(new QToolButton());

mButtonMinus->setAutoRepeat(true);

mButtonMinus->setIconSize(iconSize);

mButtonMinus->setToolButtonStyle(Qt::ToolButtonIconOnly);

mButtonMinus->setIcon(QIcon(createPixmap(iconSize * 0.75, "-")));

connect(mButtonMinus.data(), &QToolButton::clicked, this, &QGVWidgetZoom::zoomMinus);

setOrientation(Qt::Vertical);

setAnchor(QPoint(10, 0), { Qt::LeftEdge });

}

void QGVWidgetZoom::setOrientation(Qt::Orientation orientation)

{

if (layout() != nullptr) {

delete layout();

}

mOrientation = orientation;

if (mOrientation == Qt::Horizontal) {

setLayout(new QHBoxLayout(this));

} else {

setLayout(new QVBoxLayout(this));

}

layout()->setSpacing(0);

layout()->setSizeConstraint(QLayout::SetMinimumSize);

layout()->setContentsMargins(0, 0, 0, 0);

layout()->addWidget(mButtonPlus.data());

layout()->addWidget(mButtonMinus.data());

}

Qt::Orientation QGVWidgetZoom::getOrientation() const

{

return mOrientation;

}

QToolButton* QGVWidgetZoom::plus()

{

return mButtonPlus.data();

}

QToolButton* QGVWidgetZoom::minus()

{

return mButtonMinus.data();

}

QPixmap QGVWidgetZoom::createPixmap(const QSize& size, const QString& text)

{

QImage image(size, QImage::Format_ARGB32_Premultiplied);

image.fill(qRgba(0, 0, 0, 0));

QPixmap pixmap = QPixmap::fromImage(image, Qt::NoFormatConversion);

QPainter painter(&pixmap);

QPen pen = QPen(Qt::black);

pen.setWidth(1);

pen.setCosmetic(true);

painter.setPen(pen);

QBrush brush = QBrush(Qt::blue);

painter.setBrush(brush);

const auto path = QGV::createTextPath(QRect(QPoint(0, 0), size), text, font(), pen.width());

painter.drawPath(path);

return pixmap;

}

void QGVWidgetZoom::zoomPlus()

{

getMap()->cameraTo(QGVCameraActions(getMap()).scaleBy(zoomExponentDown));

}

void QGVWidgetZoom::zoomMinus()

{

getMap()->cameraTo(QGVCameraActions(getMap()).scaleBy(zoomExponentUp));

}