nodes are scalable with ctrl + plus/minus

edge.cpp

@@ -38,30 +38,6 @@ Node *Edge::destNode() const
     return m_destNode;
 }
 
-/** @note This is brute force. Isn't there a simple fv for this?
-  * The precision is not the best either
-  */
-QPointF firstNotContainedPoint(const QLineF &line,
-                               const QRectF &rect,
-                               bool reverse = false)
-{
-    if (reverse)
-    {
-        for (qreal t = 1; t!=0; t-=0.01)
-        {
-            if (!rect.contains(line.pointAt(t))) return line.pointAt(t);
-        }
-    }
-    else
-    {
-        for (qreal t = 0; t!=1; t+=0.01)
-        {
-            if (!rect.contains(line.pointAt(t))) return line.pointAt(t);
-        }
-    }
-    return QPoint(0,0);
-}
-
 double Edge::getAngle() const
 {
     return m_angle;
@@ -74,16 +50,14 @@ void Edge::adjust()
 
     prepareGeometryChange();
 
-    QLineF line(mapFromItem(m_sourceNode, 0, 0) +
+    QLineF line(m_sourceNode->sceneBoundingRect().center(),
-                m_sourceNode->boundingRect().center(),
+                m_destNode->sceneBoundingRect().center());
-                mapFromItem(m_destNode, 0, 0)  +
+
-                m_destNode->boundingRect().center());
+    if (line.length() > qreal(20.))
+    {
+        m_sourcePoint = m_sourceNode->intersect(line);
+        m_destPoint = m_destNode->intersect(line,true);
 
-    if (line.length() > qreal(20.)) {
-        m_sourcePoint = firstNotContainedPoint(line,
-                            m_sourceNode->sceneBoundingRect());
-        m_destPoint = firstNotContainedPoint(line,
-                            m_destNode->sceneBoundingRect(),true);
     } else {
         m_sourcePoint = m_destPoint = line.p1();
     }

graphwidget.cpp

@@ -5,6 +5,7 @@
 #include <QMessageBox>
 #include <QFileDialog>
 #include <QtXml>
+#include <QColorDialog>
 
 #include "node.h"
 #include "edge.h"
@@ -84,6 +85,8 @@ void GraphWidget::readContentFromXmlFile(const QString &fileName)
             m_scene->addItem(node);
             node->setPos(e.attribute("x").toFloat(),
                          e.attribute("y").toFloat());
+            node->setScale(e.attribute("scale").toFloat());
+
             m_nodeList.append(node);
         }
     }
@@ -120,10 +123,13 @@ void GraphWidget::writeContentToXmlFile(const QString &fileName)
     foreach(Node *node, m_nodeList)
     {
         QDomElement cn = doc.createElement("nodes");
-//        cn.setAttribute( "id", QString::number(m_nodeList.indexOf(node)));
+
+        // no need to store ID: parsing order is preorder.
+        // cn.setAttribute( "id", QString::number(m_nodeList.indexOf(node)));
         cn.setAttribute( "x", QString::number(node->pos().x()));
         cn.setAttribute( "y", QString::number(node->pos().y()));
         cn.setAttribute( "htmlContent", node->toHtml());
+        cn.setAttribute("scale", QString::number(((QGraphicsTextItem*)node)->scale()));
         nodes_root.appendChild(cn);
     }
 
@@ -176,8 +182,6 @@ void GraphWidget::writeContentToPngFile(const QString &fileName)
 
 void GraphWidget::keyPressEvent(QKeyEvent *event)
 {
-    qDebug() << __PRETTY_FUNCTION__;
-
     // esc leaves node editing mode
     if (event->key() == Qt::Key_Escape && m_editingNode)
     {
@@ -199,11 +203,13 @@ void GraphWidget::keyPressEvent(QKeyEvent *event)
              event->key() == Qt::Key_Delete ||      // delete node
              event->key() == Qt::Key_A ||           // add edge
              event->key() == Qt::Key_D ||           // remove edge
-             ( event->modifiers() ==  Qt::ControlModifier &&  // moving node
+             ( event->modifiers() &  Qt::ControlModifier &&  // moving node
                ( event->key() == Qt::Key_Up ||
                  event->key() == Qt::Key_Down ||
                  event->key() == Qt::Key_Left ||
-               event->key() == Qt::Key_Right))))
+                 event->key() == Qt::Key_Right ||
+                 event->key() == Qt::Key_Plus ||
+                 event->key() == Qt::Key_Minus ))))
     {
         m_parent->statusBarMsg(tr("No active node."));
         return;
@@ -254,10 +260,24 @@ void GraphWidget::keyPressEvent(QKeyEvent *event)
 
         // zoom in/out
     case Qt::Key_Plus:
+        if (event->modifiers() &  Qt::ControlModifier)
+        {
+            m_activeNode->scale(qreal(1.2));
+        }
+        else
+        {
             scaleView(qreal(1.2));
+        }
         break;
     case Qt::Key_Minus:
+        if (event->modifiers() &  Qt::ControlModifier)
+        {
+            m_activeNode->scale(qreal(1 / 1.2));
+        }
+        else
+        {
             scaleView(1 / qreal(1.2));
+        }
         break;
 
         // Hint mode: select a node vimperator style
@@ -359,6 +379,14 @@ void GraphWidget::keyPressEvent(QKeyEvent *event)
         m_edgeDeleting = true;
         break;
 
+    case Qt::Key_C:
+    {
+        QColorDialog dialog(this);
+        if (dialog.exec())
+            QColor color = dialog.selectedColor();
+
+        break;
+    }
     default:
         QGraphicsView::keyPressEvent(event);
     }
@@ -554,6 +582,7 @@ void GraphWidget::addFirstNode()
     m_scene->addItem(node);
     node->setPos(-25, -25);
     node->setBorder(false);
+
     m_nodeList.append(node);
 
     m_activeNode = m_nodeList.first();

graphwidget.h

@@ -35,12 +35,11 @@ protected:
 
     void keyPressEvent(QKeyEvent *event);
     void wheelEvent(QWheelEvent *event);
-    void scaleView(qreal scaleFactor);
     void drawBackground(QPainter *painter, const QRectF &rect);
 
-
 private:
 
+    void scaleView(qreal scaleFactor);
     void showNodeNumbers();
     void showingAllNodeNumbers(const bool &show = true);
     void showingNodeNumbersBeginWithNumber(const int &number,

node.cpp

@@ -16,7 +16,7 @@ Node::Node(GraphWidget *parent) :
     m_graph(parent),
     m_isActive(false),
     m_number(-1),
-    m_hasBorder(false),
+    m_hasBorder(true),
     m_numberIsSpecial(false)
 {
     setFlag(ItemIsMovable);
@@ -66,6 +66,11 @@ void Node::removeEdgeFromList(Edge *edge)
     }
 }
 
+void Node::adjustEdges()
+{
+    foreach (EdgeElement element, m_edgeList) element.edge->adjust();
+}
+
 void Node::setBorder(const bool &hasBorder)
 {
    m_hasBorder = hasBorder;
@@ -90,6 +95,21 @@ void Node::setEditable(const bool &editable)
     setTextCursor(c);
 }
 
+void Node::scale(const qreal &factor)
+{
+    qDebug() << factor * QGraphicsTextItem::scale();
+
+    if (factor * QGraphicsTextItem::scale() < 0.3 ||
+        factor * QGraphicsTextItem::scale() > 5 )
+        return;
+
+    // it would make stuff difficult, like limiting the pos. inside scene
+//    setTransformOriginPoint(boundingRect().center());
+
+    QGraphicsTextItem::setScale(factor * QGraphicsTextItem::scale());
+    adjustEdges();
+}
+
 void Node::showNumber(const int &number,
                       const bool& show,
                       const bool &numberIsSpecial)
@@ -197,6 +217,40 @@ bool Node::isConnected(const Node *node) const
     return false;
 }
 
+QPointF Node::intersect(const QLineF &line, const bool &reverse) const
+{
+//    QPainterPath shape;
+//    shape.addRoundedRect(sceneBoundingRect(), 20.0, 15.0);
+
+//    QPainterPath l;
+//    l.moveTo(sceneBoundingRect().center());
+//    l.lineTo(line.p2());
+
+//    return shape.intersected(l).pointAtPercent(0.5);
+
+
+    /// @but this just does not work, doing it with brute force
+    QPainterPath path;
+    path.addRoundedRect(sceneBoundingRect(), 28.0, 28.0);
+
+    if (reverse)
+    {
+        for (qreal t = 1; t!=0; t-=0.01)
+        {
+            if (!path.contains(line.pointAt(t))) return line.pointAt(t);
+        }
+    }
+    else
+    {
+        for (qreal t = 0; t!=1; t+=0.01)
+        {
+            if (!path.contains(line.pointAt(t))) return line.pointAt(t);
+        }
+    }
+
+    return QPointF(0,0);
+}
+
 QList<Edge *> Node::edgesFrom() const
 {
     QList<Edge *> list;
@@ -219,29 +273,25 @@ void Node::paint(QPainter *painter,
         painter->setPen(Qt::transparent);
         painter->setBrush(m_numberIsSpecial ? Qt::green : Qt::yellow);
 
-        painter->drawRoundedRect(QRect(boundingRect().topLeft().toPoint(),
+        painter->drawRoundedRect(boundingRect(), 20.0, 15.0);
-                          boundingRect().bottomRight().toPoint()), 20.0, 15.0);
-        painter->setBrush(Qt::NoBrush);
     }
-    else if (m_isActive) // draw background for active node
+    else
     {
+        m_hasBorder ?
+            painter->setPen(m_isActive ? Qt::red : Qt::blue) :
             painter->setPen(Qt::transparent);
+
+        if (m_isActive)
                 painter->setBrush(Node::m_orange);
-        painter->drawRoundedRect(QRect(boundingRect().topLeft().toPoint(),
+
-                          boundingRect().bottomRight().toPoint()), 20.0, 15.0);
+        painter->drawRoundedRect(boundingRect(), 20.0, 15.0);
-        painter->setBrush(Qt::NoBrush);
     }
+    painter->setBrush(Qt::NoBrush);
+
 
     // the text itself
     QGraphicsTextItem::paint(painter, option, w);
 
-    if (m_hasBorder)
-    {
-        painter->setPen(m_isActive ? Qt::red : Qt::blue);
-        painter->drawRect(QRect(boundingRect().topLeft().toPoint(),
-                          boundingRect().bottomRight().toPoint() -
-                          QPoint(1,1)));
-    }
 
     // print num to topleft corner in hint mode.
     if (m_number != -1)
@@ -268,7 +318,7 @@ QVariant Node::itemChange(GraphicsItemChange change, const QVariant &value)
             // the fence is reduced with the size of the node
             QRectF rect (scene()->sceneRect().topLeft(),
                          scene()->sceneRect().bottomRight() -
-                            boundingRect().bottomRight());
+                         boundingRect().bottomRight() * QGraphicsTextItem::scale() );
 
             if (!rect.contains(newPos))
             {
@@ -316,6 +366,14 @@ void Node::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
     QGraphicsItem::mouseMoveEvent(event);
 }
 
+/// @bug it seems sceneBoundingRect().contains doesn't care about path retval...
+QPainterPath Node::shape () const
+{
+    QPainterPath path;
+    path.addRoundedRect(boundingRect(), 20.0, 15.0);
+    return path;
+}
+
 double Node::doubleModulo(const double &devided, const double &devisor)
 {
     return devided - static_cast<double>(devisor * static_cast<int>(devided

node.h

@@ -19,10 +19,12 @@ public:
     void addEdge(Edge *edge, bool startsFromThisNode);
     void deleteEdge(Node *otherEnd);
     void removeEdgeFromList(Edge *edge);
+    void adjustEdges();
 
     void setBorder(const bool &hasBorder);
     void setActive(const bool &active = true);
     void setEditable(const bool &editable = true);
+    void scale(const qreal &factor);
 
     void showNumber(const int &number, const bool& show = true,
                     const bool &numberIsSpecial = false);
@@ -31,6 +33,7 @@ public:
     // changing visibility from prot to pub
     void keyPressEvent(QKeyEvent *event);
     bool isConnected(const Node *node) const;
+    QPointF intersect(const QLineF &line, const bool &reverse = false) const;
 
     QList<Edge *> edgesFrom() const;
 
@@ -43,6 +46,7 @@ protected:
     void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
     void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
     void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
+    QPainterPath shape () const;
 
 private: