hoverpoints.cpp

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/*=========================================================================
 Modifications were made by the GoFigure Dev. Team.
 while at Megason Lab, Systems biology, Harvard Medical school, 2009-11

 Copyright (c) 2009-11, President and Fellows of Harvard College.
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:

 Redistributions of source code must retain the above copyright notice,
 this list of conditions and the following disclaimer.
 Redistributions in binary form must reproduce the above copyright notice,
 this list of conditions and the following disclaimer in the documentation
//  and/or other materials provided with the distribution.
 Neither the name of the  President and Fellows of Harvard College
 nor the names of its contributors may be used to endorse or promote
 products derived from this software without specific prior written
 permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 =========================================================================*/

#ifdef QT_OPENGL_SUPPORT
#include <QGLWidget>
#endif

#include "hoverpoints.h"

#define printf

HoverPoints::HoverPoints(QWidget *widget, PointShape shape)
    : QObject(widget)
{
    m_widget = widget;
    widget->installEventFilter(this);
    widget->setAttribute(Qt::WA_AcceptTouchEvents);

    m_oldSize[0] = -1;
    m_oldSize[1] = -1;
    m_connectionType = CurveConnection;
    m_sortType = NoSort;
    m_shape = shape;
    m_pointPen = QPen(QColor(255, 255, 255, 191), 1);
    m_connectionPen = QPen(QColor(255, 255, 255, 127), 2);
    m_pointBrush = QBrush(QColor(191, 191, 191, 127));
    m_pointSize = QSize(11, 11);
    m_currentIndex = -1;
    m_editable = true;
    m_enabled = true;

    if(shape == HoverPoints::CircleShape){
      m_pointPen = QPen(QColor(50, 50, 50, 191), 1);
      m_connectionPen = QPen(QColor(0, 0, 0, 127), 2);
      m_enabled = false;
    }

    connect(this, SIGNAL(pointsChanged(QPolygonF)),
            m_widget, SLOT(update()));
}


void HoverPoints::setEnabled(bool enabled)
{
    if (m_enabled != enabled) {
        m_enabled = enabled;
        m_widget->update();
    }
}


bool HoverPoints::eventFilter(QObject *object, QEvent *event)
{
    if (object == m_widget) {
        switch (event->type()) {

        case QEvent::MouseButtonPress:
        {
            if(m_shape != CircleShape || !m_enabled)
              break;

            if (!m_fingerPointMapping.isEmpty())
                return true;
            QMouseEvent *me = (QMouseEvent *) event;

            QPointF clickPos = me->pos();
            int index = -1;
            for (int i=0; i<m_points.size(); ++i) {
                QPainterPath path;
                path.addEllipse(pointBoundingRect(i));

                if (path.contains(clickPos)) {
                    index = i;
                    break;
                }
            }

            if (me->button() == Qt::LeftButton) {
                if (index == -1) {
                    if (!m_editable)
                        return false;
                    int pos = 0;
                    // Insert sort for x or y
                    if (m_sortType == XSort) {
                        for (int i=0; i<m_points.size(); ++i)
                            if (m_points.at(i).x() > clickPos.x()) {
                                pos = i;
                                break;
                            }
                    } else if (m_sortType == YSort) {
                        for (int i=0; i<m_points.size(); ++i)
                            if (m_points.at(i).y() > clickPos.y()) {
                                pos = i;
                                break;
                            }
                    }

                    m_points.insert(pos, clickPos);
                    m_locks.insert(pos, 0);
                    m_currentIndex = pos;
                    firePointChange();
                } else {
                    m_currentIndex = index;
                }
                return true;

            } else if (me->button() == Qt::RightButton) {
                if (index >= 0 && m_editable) {
                    if (m_locks[index] == 0) {
                        m_locks.remove(index);
                        m_points.remove(index);
                    }
                    firePointChange();
                    return true;
                }
            }

        }
        break;

        case QEvent::MouseButtonRelease:

            if(m_shape != CircleShape || !m_enabled)
              break;

            if (!m_fingerPointMapping.isEmpty())
                return true;
            m_currentIndex = -1;
            break;

        case QEvent::MouseMove:

            if(m_shape != CircleShape || !m_enabled)
              break;

            if (!m_fingerPointMapping.isEmpty())
                return true;
            if (m_currentIndex >= 0)
                movePoint(m_currentIndex, ((QMouseEvent *)event)->pos());
            break;
        case QEvent::TouchBegin:
        case QEvent::TouchUpdate:
            {
                if(m_shape != CircleShape || !m_enabled)
                  break;

                const QTouchEvent *const touchEvent = static_cast<const QTouchEvent*>(event);
                const QList<QTouchEvent::TouchPoint> points = touchEvent->touchPoints();
                const qreal pointSize = qMax(m_pointSize.width(), m_pointSize.height());
                foreach (const QTouchEvent::TouchPoint &touchPoint, points) {
                    const int id = touchPoint.id();
                    switch (touchPoint.state()) {
                    case Qt::TouchPointPressed:
                        {
                            // find the point, move it
                            QSet<int> activePoints = QSet<int>::fromList(m_fingerPointMapping.values());
                            int activePoint = -1;
                            qreal distance = -1;
                            const int pointsCount = m_points.size();
                            const int activePointCount = activePoints.size();
                            if (pointsCount == 2 && activePointCount == 1) { // only two points
                                activePoint = activePoints.contains(0) ? 1 : 0;
                            } else {
                                for (int i=0; i<pointsCount; ++i) {
                                    if (activePoints.contains(i))
                                        continue;

                                    qreal d = QLineF(touchPoint.pos(), m_points.at(i)).length();
                                    if ((distance < 0 && d < 12 * pointSize) || d < distance) {
                                        distance = d;
                                        activePoint = i;
                                    }

                                }
                            }
                            if (activePoint != -1) {
                                m_fingerPointMapping.insert(touchPoint.id(), activePoint);
                                movePoint(activePoint, touchPoint.pos());
                            }
                        }
                        break;
                    case Qt::TouchPointReleased:
                        {
                            // move the point and release
                            QHash<int,int>::iterator it = m_fingerPointMapping.find(id);
                            movePoint(it.value(), touchPoint.pos());
                            m_fingerPointMapping.erase(it);
                        }
                        break;
                    case Qt::TouchPointMoved:
                        {
                            // move the point
                            const int pointIdx = m_fingerPointMapping.value(id, -1);
                            if (pointIdx >= 0) // do we track this point?
                                movePoint(pointIdx, touchPoint.pos());
                        }
                        break;
                    default:
                        break;
                    }
                }
                if (m_fingerPointMapping.isEmpty()) {
                    event->ignore();
                    return false;
                } else {
                    return true;
                }
            }
            break;
        case QEvent::TouchEnd:

            if(m_shape != CircleShape || !m_enabled)
              break;

            if (m_fingerPointMapping.isEmpty()) {
                event->ignore();
                return false;
            }
            return true;
            break;

        // even if !enable, we should update the position of the points on
        // resize event
        case QEvent::Resize:
        {
            QResizeEvent *e = (QResizeEvent *) event;
            if (m_oldSize[0] == 0 || m_oldSize[1] == 0)
                break;

            qreal stretch_x = e->size().width() / qreal(m_oldSize[0]);
            qreal stretch_y = e->size().height() / qreal(m_oldSize[1]);

            for (int i=0; i<m_points.size(); ++i) {
                QPointF p = m_points[i];
                movePoint(i, QPointF(p.x() * stretch_x, p.y() * stretch_y), false);
            }

            this->m_oldSize[0] = e->size().width();
            m_oldSize[1] = e->size().height();
            break;
        }

        case QEvent::Paint:
        {
            if(!m_enabled)
              break;

            QWidget *that_widget = m_widget;
            m_widget = 0;
            QApplication::sendEvent(object, event);
            m_widget = that_widget;
            paintPoints();
            return true;
        }
        default:
            break;
        }
    }

    return false;
}


void HoverPoints::paintPoints()
{
    QPainter p;
    p.begin(m_widget);

    p.setRenderHint(QPainter::Antialiasing);

    if (m_connectionPen.style() != Qt::NoPen && m_connectionType != NoConnection)
      {
      p.setPen(m_connectionPen);
      p.drawPolyline(m_points);
      }

    if(m_shape != CircleShape)
      return;

    p.setPen(m_pointPen);
    p.setBrush(m_pointBrush);

    for (int i=0; i<m_points.size(); ++i) {
        QRectF bounds = pointBoundingRect(i);
        p.drawEllipse(bounds);
    }
}

static QPointF bound_point(const QPointF &point, const QRectF &bounds, int lock)
{
    QPointF p = point;

    qreal left = bounds.left();
    qreal right = bounds.right();
    qreal top = bounds.top();
    qreal bottom = bounds.bottom();

    if (p.x() < left || (lock & HoverPoints::LockToLeft)) p.setX(left);
    else if (p.x() > right || (lock & HoverPoints::LockToRight)) p.setX(right);

    if (p.y() < top || (lock & HoverPoints::LockToTop)) p.setY(top);
    else if (p.y() > bottom || (lock & HoverPoints::LockToBottom)) p.setY(bottom);

    return p;
}

void HoverPoints::setPoints(const QPolygonF &points)
{
    if (points.size() != m_points.size())
        m_fingerPointMapping.clear();
    m_points.clear();
    for (int i=0; i<points.size(); ++i)
        m_points << bound_point(points.at(i), boundingRect(), 0);

    m_locks.clear();
    if (m_points.size() > 0) {
        m_locks.resize(m_points.size());

        m_locks.fill(0);
    }
}


void HoverPoints::movePoint(int index, const QPointF &point, bool emitUpdate)
{
    m_points[index] = bound_point(point, boundingRect(), m_locks.at(index));
    if (emitUpdate)
        firePointChange();
}


inline static bool x_less_than(const QPointF &p1, const QPointF &p2)
{
    return p1.x() < p2.x();
}


inline static bool y_less_than(const QPointF &p1, const QPointF &p2)
{
    return p1.y() < p2.y();
}

void HoverPoints::firePointChange()
{
    if (m_sortType != NoSort) {

        QPointF oldCurrent;
        if (m_currentIndex != -1) {
            oldCurrent = m_points[m_currentIndex];
        }

        if (m_sortType == XSort)
            qSort(m_points.begin(), m_points.end(), x_less_than);
        else if (m_sortType == YSort)
            qSort(m_points.begin(), m_points.end(), y_less_than);

        // Compensate for changed order...
        if (m_currentIndex != -1) {
            for (int i=0; i<m_points.size(); ++i) {
                if (m_points[i] == oldCurrent) {
                    m_currentIndex = i;
                    break;
                }
            }
        }
    }

    emit pointsChanged(m_points);
}