Tungsten walls

core/src/mindustry/entities/comp/TankComp.java

@@ -3,20 +3,24 @@ package mindustry.entities.comp;
 import arc.math.*;
 import arc.math.geom.*;
 import arc.util.*;
+import mindustry.*;
 import mindustry.annotations.Annotations.*;
+import mindustry.content.*;
 import mindustry.entities.*;
 import mindustry.gen.*;
 import mindustry.type.*;
+import mindustry.world.*;
 import mindustry.world.blocks.environment.*;
 
 import static mindustry.Vars.*;
 
 @Component
 abstract class TankComp implements Posc, Flyingc, Hitboxc, Unitc, ElevationMovec{
-    @Import float x, y, hitSize, rotation;
+    @Import float x, y, hitSize, rotation, speedMultiplier;
+    @Import boolean hovering;
     @Import UnitType type;
 
-    transient private float treadEffectTime;
+    transient private float treadEffectTime, lastSlowdown = 1f;
 
     transient float treadTime;
     transient boolean walked;
@@ -43,6 +47,22 @@ abstract class TankComp implements Posc, Flyingc, Hitboxc, Unitc, ElevationMovec
             }
         }
 
+        //calculate overlapping tiles so it slows down when going "over" walls
+        //TODO is this a necessary mechanic?
+        int r = Math.max(Math.round(hitSize * 0.6f / tilesize), 1);
+
+        int solids = 0, total = (r*2+1)*(r*2+1);
+        for(int dx = -r; dx <= r; dx++){
+            for(int dy = -r; dy <= r; dy++){
+                Tile t = Vars.world.tileWorld(x + dx*tilesize, y + dy*tilesize);
+                if(t == null ||  t.solid()){
+                    solids ++;
+                }
+            }
+        }
+
+        lastSlowdown = Mathf.lerp(1f, type.crawlSlowdown, Mathf.clamp((float)solids / total / type.crawlSlowdownFrac));
+
         //trigger animation only when walking manually
         if(walked || net.client()){
             float len = deltaLen();
@@ -51,6 +71,14 @@ abstract class TankComp implements Posc, Flyingc, Hitboxc, Unitc, ElevationMovec
         }
     }
 
+    @Override
+    @Replace
+    public float floorSpeedMultiplier(){
+        Floor on = isFlying() || hovering ? Blocks.air.asFloor() : floorOn();
+        //TODO take into account extra blocks
+        return on.speedMultiplier * speedMultiplier * lastSlowdown;
+    }
+
     @Replace
     @Override
     public @Nullable Floor drownFloor(){