Merge pull request 'vertical_horizontal' (#2) from vertical_horizontal into master

Reviewed-on: #2

Canvas.cpp

@@ -75,15 +75,29 @@ void Canvas::mousePressEvent(QMouseEvent* event)
 	#ifdef _DEBUG
 		qDebug() << "Scene point in" << scene.x() << scene.y();
 	#endif
-	
+
 	if (mode == Mode::None){
 		Point* p = findPointAt(scene);
 		if (p) {
 			draggedPoint = p;
 			dragOffset = scene - QPointF(*p->x, *p->y);
-			return;
 		}
 	}
+
+	else if (mode == Mode::Horizontal || mode == Mode::Vertical) {
+		Line* found = findAt(scene);
+
+		if (found) {
+			if (mode == Mode::Horizontal)
+				sys.addConstraintHorizontal(*found, constraints_count++);
+			else
+				sys.addConstraintVertical(*found, constraints_count++);
+			update();
+		}
+		mode = Mode::None;
+		after_constraint = true;
+	}
+
 	else if (mode == Mode::DrawingLine) {
 		if (!current_line) {
 			current_line = new Line();