finalizes resizing. adds centerdrag: when not clicking the corners, the plane...

finalizes resizing. adds centerdrag: when not clicking the corners, the plane itself will be translated while preserving normal direction

PlanePlugin.cc

@@ -204,12 +204,10 @@ void PlanePlugin::slotMouseEvent(QMouseEvent *_event) {
               wMouseDownPosition_ = (w * p0) + (u * p1) + (v * p2);
             }
 
-            if (target_idx == 0)
-              return;
+            pickedCorner_ = target_idx;
 
             // We hit a corner so start dragging
             dragging_ = true;
-            pickedCorner_ = target_idx;
           }
         }
       }
@@ -219,7 +217,6 @@ void PlanePlugin::slotMouseEvent(QMouseEvent *_event) {
 
     case QEvent::MouseMove: {
 
-      // We are actually dragging a corner
       if (dragging_ && curPlane_) {
 
         QPoint position = _event->pos();
@@ -227,8 +224,8 @@ void PlanePlugin::slotMouseEvent(QMouseEvent *_event) {
         /// matrix to transform points from image plane to curPlane_
         auto plane = origPlane_;
 
-        /// get the world position of the projected cursor by intersecting plane
-        /// equation with ray
+        /// get the world position of the projected cursor by intersecting
+        /// plane equation with ray
         {
           /// view coords in worldspace, with flipped y-axis
           const auto viewCoord = ACG::Vec3d(
@@ -259,12 +256,16 @@ void PlanePlugin::slotMouseEvent(QMouseEvent *_event) {
         }
 
         /// relative to plane
-        const auto wCurrMousePos = wCurrMousePos_ - plane.position;
         const auto wMouseDownPosition = wMouseDownPosition_ - plane.position;
+        /// relative to plane
+        const auto wCurrMousePos = wCurrMousePos_ - plane.position;
 
         /// update vector in worldspace
         const auto worldSpaceUpdate = (wCurrMousePos - wMouseDownPosition) / 2.;
 
+        if (pickedCorner_ != 0) {
+          /// We are actually dragging a corner
+
           const auto distClickOrigin = wMouseDownPosition;
 
           /// scale by half updates length
@@ -274,10 +275,15 @@ void PlanePlugin::slotMouseEvent(QMouseEvent *_event) {
           const auto xscale = scale[0] * plane.xDirection.length();
           const auto yscale = scale[1] * plane.yDirection.length();
           plane.setSize(xscale, yscale);
+        }
+
+        /// we are just dragging the plane along (also happens when scaling,
+        /// dont worry)
         plane.position += worldSpaceUpdate;
 
         curPlane_->plane() = plane; /// overwrite plane
 
+        /// signal for updates
         if (lastObjId_ > 0)
           emit updatedObject(lastObjId_, UPDATE_GEOMETRY);
         else