Added argument for catenary direction

core/src/main/java/com/boydti/fawe/config/BBC.java

@@ -131,6 +131,7 @@ public enum BBC {
     BRUSH_SMOOTH("Note: Use the blend brush if you want to smooth overhangs or caves.", "WorldEdit.Brush"),
     BRUSH_SPLINE("Click to add a point, click the same spot to finish", "WorldEdit.Brush"),
     BRUSH_LINE_PRIMARY("Added point %s0, click another position to create the line", "WorldEdit.Brush"),
+    BRUSH_CATENARY_DIRECTION("Added point %s0, click the direction you want to create the spline", "WorldEdit.Brush"),
     BRUSH_LINE_SECONDARY("Created spline", "WorldEdit.Brush"),
     BRUSH_SPLINE_PRIMARY_2("Added position, Click the same spot to join!", "WorldEdit.Brush"),
     BRUSH_SPLINE_SECONDARY_ERROR("Not enough positions set!", "WorldEdit.Brush"),

core/src/main/java/com/boydti/fawe/object/brush/CatenaryBrush.java

@@ -7,18 +7,24 @@ import com.sk89q.worldedit.MaxChangedBlocksException;
 import com.sk89q.worldedit.Vector;
 import com.sk89q.worldedit.command.tool.brush.Brush;
 import com.sk89q.worldedit.function.pattern.Pattern;
+import com.sk89q.worldedit.util.Location;
+
 import java.util.Arrays;
 import java.util.List;
 
 public class CatenaryBrush implements Brush, ResettableTool {
 
-    private final boolean shell, select;
+    private final boolean shell, select, direction;
     private final double slack;
-    private Vector pos1;
 
-    public CatenaryBrush(boolean shell, boolean select, double lengthFactor) {
+    private Vector pos1;
+    private Vector pos2;
+    private Vector vertex;
+
+    public CatenaryBrush(boolean shell, boolean select, boolean direction, double lengthFactor) {
         this.shell = shell;
         this.select = select;
+        this.direction = direction;
         this.slack = lengthFactor;
     }
 
@@ -32,8 +38,21 @@ public class CatenaryBrush implements Brush, ResettableTool {
             }
             return;
         }
-        Vector vertex = getVertex(pos1, pos2, slack);
+        if (this.vertex == null) {
+            vertex = getVertex(pos1, pos2, slack);
+            if (this.direction) {
+                BBC.BRUSH_CATENARY_DIRECTION.send(editSession.getPlayer(), 2);
+                return;
+            }
+        } else if (this.direction) {
+            Location loc = editSession.getPlayer().getPlayer().getLocation();
+            Vector facing = loc.getDirection().normalize();
+            Vector midpoint = pos1.add(pos2).divide(2);
+            Vector offset = midpoint.subtract(vertex);
+            vertex = midpoint.add(facing.multiply(offset.length()));
+        }
         List<Vector> nodes = Arrays.asList(pos1, vertex, pos2);
+        vertex = null;
         editSession.drawSpline(pattern, nodes, 0, 0, 0, 10, size, !shell);
         if (!visual) {
             BBC.BRUSH_LINE_SECONDARY.send(editSession.getPlayer());

core/src/main/java/com/sk89q/worldedit/command/BrushCommands.java

@@ -221,15 +221,16 @@ public class BrushCommands extends BrushProcessor {
             help = "Create a hanging line between two points.\n" +
                     "The lengthFactor controls how long the line is\n" +
                     "The -h flag creates only a shell\n" +
-                    "The -s flag selects the clicked point after drawing\n",
+                    "The -s flag selects the clicked point after drawing\n" +
+                    "The -d flag sags the catenary toward the facing direction\n",
             min = 1,
             max = 3
     )
     @CommandPermissions("worldedit.brush.spline")
-    public BrushSettings catenaryBrush(Player player, EditSession editSession, LocalSession session, Pattern fill, @Optional("1.2") @Range(min=1) double lengthFactor, @Optional("0") double radius, @Switch('h') boolean shell, @Switch('s') boolean select, CommandContext context) throws WorldEditException {
+    public BrushSettings catenaryBrush(Player player, EditSession editSession, LocalSession session, Pattern fill, @Optional("1.2") @Range(min=1) double lengthFactor, @Optional("0") double radius, @Switch('h') boolean shell, @Switch('s') boolean select, @Switch('d') boolean facingDirection, CommandContext context) throws WorldEditException {
         getWorldEdit().checkMaxBrushRadius(radius);
         return set(session, context,
-                new CatenaryBrush(shell, select, lengthFactor))
+                new CatenaryBrush(shell, select, facingDirection, lengthFactor))
                 .setSize(radius)
                 .setFill(fill);
     }