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/* This file is part of the KDE project
* SPDX-FileCopyrightText: 2014 Dan Leinir Turthra Jensen <admin@leinir.dk>
*
* SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*
*/
#include "ScribbleArea.h"
#include <QMouseEvent>
#include <QPainter>
ScribbleArea::ScribbleArea(QQuickItem *parent)
: QQuickPaintedItem(parent)
, scribbling(false)
, myPenWidth(10)
, myPenColor(QColor(242, 178, 0))
{
setAcceptedMouseButtons(Qt::LeftButton);
image = QImage(width(), height(), QImage::Format_ARGB32_Premultiplied);
image.fill(Qt::transparent);
}
ScribbleArea::~ScribbleArea() = default;
void ScribbleArea::clear()
{
image.fill(Qt::transparent);
}
QColor ScribbleArea::color() const
{
return myPenColor;
}
void ScribbleArea::setColor(const QColor &newColor)
{
myPenColor = newColor;
emit colorChanged();
}
int ScribbleArea::penWidth() const
{
return myPenWidth;
}
void ScribbleArea::setPenWidth(const int &newWidth)
{
myPenWidth = newWidth;
emit penWidthChanged();
}
bool ScribbleArea::event(QEvent *event)
{
if (event->type() == QEvent::Resize) {
image = QImage(width(), height(), QImage::Format_ARGB32_Premultiplied);
image.fill(Qt::transparent);
}
return QQuickPaintedItem::event(event);
}
void ScribbleArea::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton) {
lastPoint = event->pos();
scribbling = true;
emit paintingStarted();
}
}
void ScribbleArea::mouseMoveEvent(QMouseEvent *event)
{
if ((event->buttons() & Qt::LeftButton) && scribbling)
drawLineTo(event->pos());
}
void ScribbleArea::mouseReleaseEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton && scribbling) {
drawLineTo(event->pos());
scribbling = false;
emit paintingStopped();
}
}
void ScribbleArea::paint(QPainter *painter)
{
painter->drawImage(boundingRect(), image);
}
void ScribbleArea::drawLineTo(const QPointF &endPoint)
{
if (image.isNull()) {
image = QImage(width(), height(), QImage::Format_ARGB32_Premultiplied);
image.fill(Qt::transparent);
}
QPainter painter(&image);
painter.setPen(QPen(myPenColor, myPenWidth, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
painter.setRenderHint(QPainter::Antialiasing, true);
painter.drawLine(lastPoint, endPoint);
painter.end();
int rad = (myPenWidth / 2) + 2;
update(QRectF(lastPoint, endPoint).normalized().adjusted(-rad, -rad, +rad, +rad).toRect());
lastPoint = endPoint;
}
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