Conveyor upgrade system (#3912)

* conveyor/conduit upgrading system

* style

core/src/mindustry/input/InputHandler.java

@@ -32,6 +32,7 @@ import mindustry.ui.fragments.*;
 import mindustry.world.*;
 import mindustry.world.blocks.*;
 import mindustry.world.blocks.ConstructBlock.*;
+import mindustry.world.blocks.distribution.*;
 import mindustry.world.blocks.payloads.*;
 import mindustry.world.blocks.power.*;
 import mindustry.world.blocks.storage.CoreBlock.*;
@@ -1161,7 +1162,15 @@ public abstract class InputHandler implements InputProcessor, GestureListener{
         }
 
         if(diagonal){
-            points = Placement.pathfindLine(block != null && block.conveyorPlacement, startX, startY, endX, endY);
+            Tile start = world.tile(startX, startY);
+            Tile end = world.tile(endX, endY);
+            if(block != null && block instanceof Autotiler
+                    && start.build instanceof ChainedBuilding && end.build instanceof ChainedBuilding
+                    && block.canReplace(end.build.block) && block.canReplace(start.build.block)){
+                points = Placement.upgradeLine(startX, startY, endX, endY);
+            }else{
+                points = Placement.pathfindLine(block != null && block.conveyorPlacement, startX, startY, endX, endY);
+            }
         }else{
             points = Placement.normalizeLine(startX, startY, endX, endY);
         }

core/src/mindustry/input/Placement.java

@@ -5,7 +5,9 @@ import arc.math.*;
 import arc.math.geom.*;
 import arc.struct.*;
 import arc.util.pooling.*;
+import mindustry.gen.*;
 import mindustry.world.*;
+import mindustry.world.blocks.distribution.*;
 
 import static mindustry.Vars.*;
 
@@ -23,7 +25,6 @@ public class Placement{
     /** Normalize a diagonal line into points. */
     public static Seq<Point2> pathfindLine(boolean conveyors, int startX, int startY, int endX, int endY){
         Pools.freeAll(points);
-
         points.clear();
         if(conveyors && Core.settings.getBool("conveyorpathfinding")){
             if(astar(startX, startY, endX, endY)){
@@ -54,6 +55,20 @@ public class Placement{
         return points;
     }
 
+    public static Seq<Point2> upgradeLine(int startX, int startY, int endX, int endY){
+        Pools.freeAll(points);
+        points.clear();
+        Building building = world.tile(startX, startY).build;
+        points.add(Pools.obtain(Point2.class, Point2::new).set(startX, startY));
+        while(building.tile.x != endX || building.tile.y != endY){
+            ChainedBuilding chained = (ChainedBuilding)building;
+            if(chained.next() == null) return pathfindLine(true, startX, startY, endX, endY);
+            building = chained.next();
+            points.add(Pools.obtain(Point2.class, Point2::new).set(building.tile.x, building.tile.y));
+        }
+        return points;
+    }
+
     private static float tileHeuristic(Tile tile, Tile other){
         Block block = control.input.block;
 

core/src/mindustry/world/blocks/distribution/ChainedBuilding.java

@@ -0,0 +1,7 @@
+package mindustry.world.blocks.distribution;
+
+import mindustry.gen.*;
+
+public interface ChainedBuilding{
+    Building next();
+}

core/src/mindustry/world/blocks/distribution/Conveyor.java

@@ -91,7 +91,7 @@ public class Conveyor extends Block implements Autotiler{
             Mathf.mod(req.tile().build.rotation - req.rotation, 2) == 1 ? Blocks.junction : this;
     }
 
-    public class ConveyorBuild extends Building{
+    public class ConveyorBuild extends Building implements ChainedBuilding{
         //parallel array data
         public Item[] ids = new Item[capacity];
         public float[] xs = new float[capacity];
@@ -391,5 +391,11 @@ public class Conveyor extends Block implements Autotiler{
 
             len--;
         }
+
+        @Nullable
+        @Override
+        public Building next(){
+            return nextc;
+        }
     }
 }

core/src/mindustry/world/blocks/liquid/Conduit.java

@@ -16,6 +16,7 @@ import mindustry.graphics.*;
 import mindustry.type.*;
 import mindustry.world.*;
 import mindustry.world.blocks.*;
+import mindustry.world.blocks.distribution.*;
 
 import static mindustry.Vars.*;
 
@@ -73,7 +74,7 @@ public class Conduit extends LiquidBlock implements Autotiler{
         return new TextureRegion[]{Core.atlas.find("conduit-bottom"), topRegions[0]};
     }
 
-    public class ConduitBuild extends LiquidBuild{
+    public class ConduitBuild extends LiquidBuild implements ChainedBuilding{
         public float smoothLiquid;
         public int blendbits, xscl, yscl, blending;
 
@@ -137,5 +138,15 @@ public class Conduit extends LiquidBlock implements Autotiler{
                 sleep();
             }
         }
+
+        @Nullable
+        @Override
+        public Building next(){
+            Tile next = tile.nearby(rotation);
+            if(next != null && next.build instanceof ConduitBuild){
+                return next.build;
+            }
+            return null;
+        }
     }
 }