Fixes for older campaign compatibility issues.

src/main/java/net/rptools/maptool/model/Zone.java

@@ -2296,7 +2296,11 @@ public ZoneDto toDto() {
     dto.setExposedArea(Mapper.map(exposedArea));
     dto.setHasFog(hasFog);
     dto.setTopology(Mapper.map(topology));
-    dto.setFogPaint(fogPaint.toDto());
+    if (fogPaint == null) { // Account for old campaigns without fog paint
+      dto.setFogPaint(DEFAULT_FOG.toDto());
+    } else {
+      dto.setFogPaint(fogPaint.toDto());
+    }
     dto.setHillVbl(Mapper.map(hillVbl));
     dto.setPitVbl(Mapper.map(pitVbl));
     dto.setTopologyTerrain(Mapper.map(topologyTerrain));

src/main/java/net/rptools/maptool/model/drawing/AbstractTemplate.java

@@ -188,9 +188,13 @@ public void setZoneId(GUID zoneId) {
    * @param area Paint the area?
    */
   protected void paint(Graphics2D g, boolean border, boolean area) {
-    if (radius == 0) return;
+    if (radius == 0) {
+      return;
+    }
     Zone zone = MapTool.getCampaign().getZone(zoneId);
-    if (zone == null) return;
+    if (zone == null) {
+      return;
+    }
 
     // Find the proper distance
     int gridSize = zone.getGrid().getSize();

src/main/java/net/rptools/maptool/model/drawing/Drawable.java

@@ -139,11 +139,15 @@ static Drawable fromDto(DrawableDto drawableDto) {
         drawable.setRadius(dto.getRadius());
         var vertex = dto.getVertex();
         drawable.setVertex(new ZonePoint(vertex.getX(), vertex.getY()));
-        drawable.setQuadrant(AbstractTemplate.Quadrant.valueOf(dto.getQuadrant()));
+        if (!dto.getQuadrant().isEmpty()) {
+          drawable.setQuadrant(AbstractTemplate.Quadrant.valueOf(dto.getQuadrant()));
+        }
         drawable.setMouseSlopeGreater(dto.getMouseSlopeGreater());
         var pathVertex = dto.getPathVertex();
         drawable.setPathVertex(new ZonePoint(pathVertex.getX(), pathVertex.getY()));
-        if (dto.hasName()) drawable.setName(dto.getName().getValue());
+        if (dto.hasName()) {
+          drawable.setName(dto.getName().getValue());
+        }
         drawable.setLayer(Zone.Layer.valueOf(dto.getLayer()));
         return drawable;
       }

src/main/java/net/rptools/maptool/model/drawing/LineCellTemplate.java

@@ -122,9 +122,15 @@ protected void paint(Graphics2D g, boolean border, boolean area) {
       return;
     }
     // Need to paint? We need a line and to translate the painting
-    if (pathVertex == null) return;
-    if (getRadius() == 0) return;
-    if (calcPath() == null) return;
+    if (pathVertex == null) {
+      return;
+    }
+    if (getRadius() == 0) {
+      return;
+    }
+    if (calcPath() == null) {
+      return;
+    }
 
     // Paint each element in the path
     int gridSize = MapTool.getCampaign().getZone(getZoneId()).getGrid().getSize();
@@ -164,7 +170,9 @@ public void setVertex(ZonePoint vertex) {
   /** @see net.rptools.maptool.model.drawing.AbstractTemplate#setRadius(int) */
   @Override
   public void setRadius(int squares) {
-    if (squares == getRadius()) return;
+    if (squares == getRadius()) {
+      return;
+    }
     clearPath();
     super.setRadius(squares);
   }
@@ -179,13 +187,19 @@ public void setRadius(int squares) {
    * @return The new path or <code>null</code> if there is no path.
    */
   protected List<CellPoint> calcPath() {
-    if (getRadius() == 0) return null;
-    if (pathVertex == null) return null;
+    if (getRadius() == 0) {
+      return null;
+    }
+    if (pathVertex == null) {
+      return null;
+    }
     int radius = getRadius();
 
     // Is there a slope?
     ZonePoint vertex = getVertex();
-    if (vertex.equals(pathVertex)) return null;
+    if (vertex.equals(pathVertex)) {
+      return null;
+    }
 
     double dx = pathVertex.x - vertex.x;
     double dy = pathVertex.y - vertex.y;
@@ -298,14 +312,18 @@ public ZonePoint getPathVertex() {
    * @param pathVertex The pathVertex to set.
    */
   public void setPathVertex(ZonePoint pathVertex) {
-    if (pathVertex.equals(this.pathVertex)) return;
+    if (pathVertex.equals(this.pathVertex)) {
+      return;
+    }
     clearPath();
     this.pathVertex = pathVertex;
   }
 
   /** Clear the current path. This will cause it to be recalculated during the next draw. */
   public void clearPath() {
-    if (path != null) pool = path;
+    if (path != null) {
+      pool = path;
+    }
     path = null;
   }
 
@@ -315,7 +333,9 @@ public void clearPath() {
    * @return Returns the current value of quadrant.
    */
   public Quadrant getQuadrant() {
-    if (quadrant != null) return Quadrant.valueOf(quadrant);
+    if (quadrant != null) {
+      return Quadrant.valueOf(quadrant);
+    }
     return null;
   }
 
@@ -325,8 +345,11 @@ public Quadrant getQuadrant() {
    * @param quadrant The quadrant to set.
    */
   public void setQuadrant(Quadrant quadrant) {
-    if (quadrant != null) this.quadrant = quadrant.name();
-    else this.quadrant = null;
+    if (quadrant != null) {
+      this.quadrant = quadrant.name();
+    } else {
+      this.quadrant = null;
+    }
   }
 
   /**
@@ -461,17 +484,29 @@ public Area getArea() {
 
   @Override
   public DrawableDto toDto() {
+
+    if (getQuadrant() == null) {
+      calcPath(); // force calculation of the quadrent
+    }
+
     var dto = LineCellTemplateDto.newBuilder();
     dto.setId(getId().toString())
         .setLayer(getLayer().name())
         .setZoneId(getZoneId().toString())
         .setRadius(getRadius())
         .setVertex(getVertex().toDto())
-        .setQuadrant(getQuadrant().name())
-        .setMouseSlopeGreater(isMouseSlopeGreater())
-        .setPathVertex(getPathVertex().toDto());
+        .setMouseSlopeGreater(isMouseSlopeGreater());
+
+    if (getQuadrant() != null) {
+      dto.setQuadrant(getQuadrant().name());
+    }
+    if (getPathVertex() != null) {
+      dto.setPathVertex(getPathVertex().toDto());
+    }
 
-    if (getName() != null) dto.setName(StringValue.of(getName()));
+    if (getName() != null) {
+      dto.setName(StringValue.of(getName()));
+    }
 
     return DrawableDto.newBuilder().setLineCellTemplate(dto).build();
   }