radialoffsettool.cpp

/*
 
Pencil2D - Traditional Animation Software
Copyright (C) 2005-2007 Patrick Corrieri & Pascal Naidon
Copyright (C) 2012-2020 Matthew Chiawen Chang
Copyright (C) 2025-2099 Oliver S. Larsen
 
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; version 2 of the License.
 
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.
 
*/
 
#include "radialoffsettool.h"
 
#include "pointerevent.h"
 
#include <QLineF>
 
RadialOffsetTool::RadialOffsetTool(QObject* parent) : QObject(parent)
{
 
}
 
RadialOffsetTool::~RadialOffsetTool()
{
}
 
void RadialOffsetTool::pointerEvent(PointerEvent* event)
{
    if (event->eventType() == PointerEvent::Press) {
        startAdjusting(event);
    } else if (event->eventType() == PointerEvent::Move) {
        if (event->buttons() & Qt::LeftButton && mIsAdjusting) {
            adjust(event);
        }
    } else if (event->eventType() == PointerEvent::Release && mIsAdjusting) {
        stopAdjusting();
    }
}
 
void RadialOffsetTool::adjust(PointerEvent* event)
{
    const qreal newValue = QLineF(mAdjustPoint, event->canvasPos()).length();
 
    emit offsetChanged(newValue);
}
 
bool RadialOffsetTool::startAdjusting(PointerEvent* event)
{
    const qreal rad = mOffset;
 
    QPointF directionDelta;
    if (mAdjustPoint.isNull()) {
        directionDelta = QPointF(-1, -1); // 45 deg back
    } else {
        directionDelta = -(event->canvasPos() - mAdjustPoint);
    }
 
    QLineF line(event->canvasPos(), event->canvasPos() + directionDelta);
    line.setLength(rad);
 
    mAdjustPoint = line.p2(); // Adjusted point on circle boundary
 
    mIsAdjusting = true;
    return true;
}
 
void RadialOffsetTool::stopAdjusting()
{
    mIsAdjusting = false;
}