it is done

core/src/mindustry/entities/traits/SolidTrait.java

@@ -0,0 +1,38 @@
+package mindustry.entities.traits;
+
+
+import arc.math.geom.*;
+import arc.math.geom.QuadTree.QuadTreeObject;
+import mindustry.Vars;
+
+public interface SolidTrait extends QuadTreeObject, MoveTrait, VelocityTrait, Entity, Position{
+
+    void hitbox(Rectangle rectangle);
+
+    void hitboxTile(Rectangle rectangle);
+
+    Vector2 lastPosition();
+
+    default boolean collidesGrid(int x, int y){
+        return true;
+    }
+
+    default float getDeltaX(){
+        return getX() - lastPosition().x;
+    }
+
+    default float getDeltaY(){
+        return getY() - lastPosition().y;
+    }
+
+    default boolean collides(SolidTrait other){
+        return true;
+    }
+
+    default void collision(SolidTrait other, float x, float y){
+    }
+
+    default void move(float x, float y){
+        Vars.collisions.move(this, x, y);
+    }
+}