Allow to render to file and add setNodePositionAttribute

QGVCore/QGVNode.cpp

@@ -100,6 +100,14 @@ QString QGVNode::getAttribute(const QString &name) const
     return QString();
 }
 
+QString QGVNode::posToAttributeString() const
+{
+    qreal gheight = QGVCore::graphHeight(_scene->_graph->graph());
+    qreal width = ND_width(_node->node())*DotDefaultDPI;
+    qreal height = ND_height(_node->node())*DotDefaultDPI;
+    return QGVCore::qtToGvPos (QGVCore::centerToOrigin (pos(), -width, -height), gheight);
+}
+
 void QGVNode::setIcon(const QImage &icon)
 {
     _icon = icon;

QGVCore/QGVNode.h

@@ -43,6 +43,8 @@ public:
     void setAttribute(const QString &label, const QString &value);
     QString getAttribute(const QString &name) const;
 
+    QString posToAttributeString () const;
+
     void setIcon(const QImage &icon);
 
     enum { Type = UserType + 2 };

QGVCore/QGVScene.cpp

@@ -120,6 +120,14 @@ void QGVScene::setRootNode(QGVNode *node)
 		agset(_graph->graph(), root, node->label().toLocal8Bit().data());
 }
 
+void QGVScene::setNodePositionAttribute()
+{
+  foreach(QGVNode* node, _nodes) {
+    node->setAttribute("pos", node->posToAttributeString().toLocal8Bit().constData());
+    node->setAttribute ("pin", "true");
+  }
+}
+
 void QGVScene::loadLayout(const QString &text)
 {
 		_graph->setGraph(QGVCore::agmemread2(text.toLocal8Bit().constData()));
@@ -199,6 +207,12 @@ void QGVScene::render (const QString &algorithm) {
       algorithm.toLocal8Bit().data(), NULL);
 }
 
+void QGVScene::render (const QString algorithm, const QString filename) {
+  gvRenderFilename(_context->context(), _graph->graph(),
+      algorithm.toLocal8Bit().data(),
+      filename.toLocal8Bit().data());
+}
+
 void QGVScene::freeLayout() {
   gvFreeLayout(_context->context(), _graph->graph());
 }

QGVCore/QGVScene.h

@@ -50,9 +50,12 @@ public:
 
     void setRootNode(QGVNode *node);
 
+    void setNodePositionAttribute();
+
     void loadLayout(const QString &text);
     void applyLayout(const QString &algorithm = "dot");
     void render (const QString &algorithm);
+    void render (const QString algorithm, const QString file);
     void freeLayout();
     void clear();