nodes can now be connected through the node editor

ui/nodeedgeui.cpp

@@ -0,0 +1,67 @@
+#include "nodeedgeui.h"
+
+#include <QPen>
+#include <QGraphicsScene>
+
+#include "global/math.h"
+#include "ui/effectui.h"
+
+NodeEdgeUI::NodeEdgeUI(NodeEdge* edge) :
+  edge_(edge),
+  output_node_(nullptr),
+  input_node_(nullptr)
+{
+  setPen(QPen(Qt::white, 2));
+}
+
+void NodeEdgeUI::adjust()
+{
+  if (output_node_ == nullptr) {
+    // Locate the output and input nodes' UIs
+
+    QList<QGraphicsItem*> all_items = scene()->items();
+
+    for (int j=0;j<all_items.size();j++) {
+      NodeUI* node = dynamic_cast<NodeUI*>(all_items.at(j));
+      if (node != nullptr) {
+
+        // Check if this node has the output row
+        int row_index = node->Widget()->GetEffect()->IndexOfRow(edge_->output());
+
+        if (row_index > -1) {
+          output_node_ = node;
+          output_index_ = row_index;
+        }
+
+        // Check if this node has the input row
+        row_index = node->Widget()->GetEffect()->IndexOfRow(edge_->input());
+
+        if (row_index > -1) {
+          input_node_ = node;
+          input_index_ = row_index;
+        }
+      }
+    }
+  }
+
+  setPath(GetEdgePath(output_node_->pos() + output_node_->GetNodeSocketRects().at(output_index_).center(),
+                      input_node_->pos() + input_node_->GetNodeSocketRects().at(input_index_).center()));
+}
+
+NodeEdge *NodeEdgeUI::edge()
+{
+  return edge_;
+}
+
+QPainterPath NodeEdgeUI::GetEdgePath(const QPointF &start_pos, const QPointF &end_pos)
+{
+  double mid_x = double_lerp(start_pos.x(), end_pos.x(), 0.5);
+
+  QPainterPath path_;
+  path_.moveTo(start_pos);
+  path_.cubicTo(QPointF(mid_x, start_pos.y()),
+                QPointF(mid_x, end_pos.y()),
+                end_pos);
+
+  return path_;
+}