Scenario: Fix line display.

src/View/Scenarios/GraphWidget.py

@@ -80,6 +80,9 @@ class ScenarioItem(QGraphicsTextItem):
 
         super(ScenarioItem, self).paint(painter, option, widget)
 
+    def itemChange(self, change, value):
+        self.graph.edges_display_update()
+        return super(ScenarioItem, self).itemChange(change, value)
 
 class EdgeItem(QGraphicsItem):
     Type = QGraphicsItem.UserType + 11
@@ -97,9 +100,14 @@ class EdgeItem(QGraphicsItem):
         return EdgeItem.Type
 
     def boundingRect(self):
-        pen_width = 2.0
-        extra = (pen_width + 5) / 2.0
+        extra = 0.0
+        for item in [self.item, self.parent_item]:
+            rect = item.boundingRect()
+            extra = max(
+                [rect.width(), rect.height(), extra]
+            )
 
+        extra /= 2
         return QRectF(
             self.parent_item.pos(),
             QSizeF(
@@ -108,50 +116,42 @@ class EdgeItem(QGraphicsItem):
             )
         ).normalized().adjusted(-extra, -extra, extra, extra)
 
-    def shape(self):
-        vec = self.item.pos() - self.parent_item.pos()
-        vec = vec * (5 / math.sqrt(QPointF.dotProduct(vec, vec)))
-        extra = QPointF(vec.y(), -vec.x())
-
-        result = QPainterPath(self.parent_item.pos() - vec + extra)
-        result.lineTo(self.parent_item.pos() - vec - extra)
-        result.lineTo(self.item.pos() + vec - extra)
-        result.lineTo(self.item.pos() + vec + extra)
-        result.closeSubpath()
-
-        return result
-
     @timer
     def paint(self, painter, option, widget):
-        line = QLineF(self.parent_item.pos(), self.item.pos())
+        line = QLineF(
+            self.get_line_item_point(self.parent_item),
+            self.get_line_item_point(self.item)
+        )
+
         if line.length() == 0.0:
             return
 
         color = Qt.black
+        arrow = self.get_arrow_path(line, color)
+
+        brush = QBrush()
+        path = QPainterPath()
+        brush.setColor(color)
+        brush.setStyle(Qt.SolidPattern)
+
         painter.setPen(
             QPen(
                 color, 2, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin
             )
         )
-        # Draw the line
         painter.drawLine(line)
-
-        arrow = self.get_arrow_path(line, color)
-
-        brush = QBrush()
-        brush.setColor(color)
-        brush.setStyle(Qt.SolidPattern)
-
-        path = QPainterPath()
         path.addPolygon(arrow)
 
         painter.drawPolygon(arrow)
         painter.fillPath(path, brush)
 
     def get_arrow_path(self, line, color):
+        pp = self.get_line_item_point(self.parent_item)
+        p = self.get_line_item_point(self.item)
+
         line_center = QPointF(
-            (self.parent_item.pos().x() + self.item.pos().x()) / 2,
-            (self.parent_item.pos().y() + self.item.pos().y()) / 2,
+            (pp.x() + p.x()) / 2,
+            (pp.y() + p.y()) / 2,
         )
 
         angle = math.acos(line.dx() / line.length())
@@ -171,6 +171,13 @@ class EdgeItem(QGraphicsItem):
 
         return poly
 
+    def get_line_item_point(self, item):
+        rect = item.boundingRect()
+        return QPointF(
+            item.pos().x() + (rect.width() / 2.0),
+            item.pos().y() + (rect.height() / 2.0)
+        )
+
 
 class GraphWidget(QGraphicsView):
     changeEdge = pyqtSignal(object)
@@ -193,7 +200,6 @@ class GraphWidget(QGraphicsView):
 
         self.scenarios_items = {}
         self.edge_items = []
-        self.texts = {}
 
         self.m_origin_x = 0.0
         self.m_origin_y = 0.0
@@ -249,6 +255,10 @@ class GraphWidget(QGraphicsView):
                 self.scene().addItem(iedge)
                 self.edge_items.append(iedge)
 
+    def edges_display_update(self):
+        for e in self.edge_items:
+            e.update()
+
     def display_update(self):
         """Clear the scene and redraw it