CrawlComp progress

core/src/mindustry/content/Fx.java

@@ -313,6 +313,13 @@ public class Fx{
         Lines.poly(e.x, e.y, 4, 13f * e.fout());
     }).layer(Layer.debris),
 
+    crawlDust = new Effect(30, e -> {
+        color(Tmp.c1.set(e.color).mul(1.1f));
+        randLenVectors(e.id, 2, 10f * e.finpow(), (x, y) -> {
+            Fill.circle(e.x + x, e.y + y, e.fslope() * 3f + 0.3f);
+        });
+    }).layer(Layer.debris),
+
     landShock = new Effect(12, e -> {
         color(Pal.lancerLaser);
         stroke(e.fout() * 3f);

core/src/mindustry/content/UnitTypes.java

@@ -2412,10 +2412,16 @@ public class UnitTypes implements ContentList{
         //region neoplasm
 
         scuttler = new UnitType("scuttler"){{
-            hitSize = 30f;
+            hitSize = 44f;
             omniMovement = false;
-            rotateSpeed = 1f;
+            rotateSpeed = 2f;
             drawCell = false;
+            segments = 4;
+            drawBody = false;
+
+            segmentScl = 4f;
+            segmentPhase = 5f;
+            speed = 1f;
         }};
 
         //endregion

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

@@ -1,6 +1,8 @@
 package mindustry.entities.comp;
 
+import arc.math.*;
 import arc.math.geom.*;
+import mindustry.*;
 import mindustry.ai.*;
 import mindustry.annotations.Annotations.*;
 import mindustry.content.*;
@@ -8,18 +10,21 @@ import mindustry.entities.*;
 import mindustry.entities.EntityCollisions.*;
 import mindustry.gen.*;
 import mindustry.type.*;
+import mindustry.world.*;
 import mindustry.world.blocks.environment.*;
 
+import static mindustry.Vars.*;
+
 //TODO
 @Component
 abstract class CrawlComp implements Posc, Rotc, Hitboxc, Unitc{
-    @Import float x, y, speedMultiplier;
+    @Import float x, y, speedMultiplier, rotation, hitSize;
     @Import UnitType type;
     @Import Vec2 vel;
 
     //TODO segments
-    float segmentRot;
-    float crawlTime;
+    transient float lastCrawlSlowdown = 1f;
+    transient float segmentRot, crawlTime;
 
     @Replace
     @Override
@@ -38,11 +43,49 @@ abstract class CrawlComp implements Posc, Rotc, Hitboxc, Unitc{
     public float floorSpeedMultiplier(){
         Floor on = isFlying() ? Blocks.air.asFloor() : floorOn();
         //TODO take into account extra blocks
-        return on.speedMultiplier * speedMultiplier;
+        return on.speedMultiplier * speedMultiplier * lastCrawlSlowdown;
+    }
+
+    @Override
+    public void add(){
+        //reset segment rotation on add
+        segmentRot = rotation;
     }
 
     @Override
     public void update(){
+        if(moving()){
+            segmentRot = Angles.moveToward(segmentRot, rotation, type.segmentRotSpeed);
+
+            int radius = (int)Math.max(0, hitSize / tilesize);
+            int count = 0, solids = 0;
+
+            //calculate tiles under this unit, and apply slowdown + particle effects
+            for(int cx = -radius; cx <= radius; cx++){
+                for(int cy = -radius; cy <= radius; cy++){
+                    if(cx*cx + cy*cy <= radius){
+                        count ++;
+                        Tile t = Vars.world.tileWorld(x + cx*tilesize, y + cy*tilesize);
+                        if(t != null){
+
+                            if(t.solid()){
+                                solids ++;
+                            }
+
+                            if(Mathf.chanceDelta(0.04)){
+                                Fx.crawlDust.at(t.worldx(), t.worldy(), t.floor().mapColor);
+                            }
+                        }else{
+                            solids ++;
+                        }
+                    }
+                }
+            }
+
+            lastCrawlSlowdown = Mathf.lerp(1f, type.crawlSlowdown, Mathf.clamp((float)solids / count / type.crawlSlowdownFrac));
+        }
+        segmentRot = Angles.clampRange(segmentRot, rotation, type.segmentMaxRot);
+
         crawlTime += vel.len();
     }
 }

core/src/mindustry/type/UnitType.java

@@ -118,7 +118,7 @@ public class UnitType extends UnlockableContent{
     public float itemOffsetY = 3f;
     public float lightRadius = -1f, lightOpacity = 0.6f;
     public Color lightColor = Pal.powerLight;
-    public boolean drawCell = true, drawItems = true, drawShields = true;
+    public boolean drawCell = true, drawItems = true, drawShields = true, drawBody = true;
     public int trailLength = 3;
     public float trailX = 4f, trailY = -3f, trailScl = 1f;
     /** Whether the unit can heal blocks. Initialized in init() */
@@ -127,6 +127,14 @@ public class UnitType extends UnlockableContent{
     public boolean singleTarget = false;
     public boolean forceMultiTarget = false;
 
+    //for crawlers
+    public int segments = 0;
+    public float segmentSpacing = 2f;
+    public float segmentScl = 4f, segmentPhase = 5f;
+    public float segmentRotSpeed = 1f, segmentMaxRot = 30f;
+    public float crawlSlowdown = 0.45f;
+    public float crawlSlowdownFrac = 0.4f;
+
     public ObjectSet<StatusEffect> immunities = new ObjectSet<>();
     public Sound deathSound = Sounds.bang;
 
@@ -134,6 +142,7 @@ public class UnitType extends UnlockableContent{
     public TextureRegion baseRegion, legRegion, region, shadowRegion, cellRegion,
         softShadowRegion, jointRegion, footRegion, legBaseRegion, baseJointRegion, outlineRegion;
     public TextureRegion[] wreckRegions;
+    public TextureRegion[] segmentRegions, segmentOutlineRegions;
 
     protected float buildTime = -1f;
     protected @Nullable ItemStack[] cachedRequirements;
@@ -442,6 +451,13 @@ public class UnitType extends UnlockableContent{
             wreckRegions[i] = Core.atlas.find(name + "-wreck" + i);
         }
 
+        segmentRegions = new TextureRegion[segments];
+        segmentOutlineRegions = new TextureRegion[segments];
+        for(int i = 0; i < segments; i++){
+            segmentRegions[i] = Core.atlas.find(name + "-segment" + i);
+            segmentOutlineRegions[i] = Core.atlas.find(name + "-segment-outline" + i);
+        }
+
         clipSize = Math.max(region.width * 2f, clipSize);
     }
 
@@ -603,10 +619,14 @@ public class UnitType extends UnlockableContent{
 
         Draw.z(z);
 
-        drawOutline(unit);
+        if(unit instanceof Crawlc c){
+            drawCrawl(c);
+        }
+
+        if(drawBody) drawOutline(unit);
         drawWeaponOutlines(unit);
         if(engineSize > 0) drawEngine(unit);
-        drawBody(unit);
+        if(drawBody) drawBody(unit);
         if(drawCell) drawCell(unit);
         drawWeapons(unit);
         if(drawItems) drawItems(unit);
@@ -873,6 +893,26 @@ public class UnitType extends UnlockableContent{
         Draw.reset();
     }
 
+    public void drawCrawl(Crawlc crawl){
+        Unit unit = (Unit)crawl;
+        applyColor(unit);
+
+        for(int p = 0; p < 2; p++){
+            TextureRegion[] regions = p == 0 ? segmentOutlineRegions : segmentRegions;
+
+            for(int i = 0; i < segments; i++){
+                float trns = Mathf.sin(crawl.crawlTime() + i * segmentPhase, segmentScl, segmentSpacing);
+
+                //at segment 0, rotation = segmentRot, but at the last segment it is rotation
+                float rot = Mathf.slerp(crawl.segmentRot(), unit.rotation, i / (float)(segments - 1));
+                float tx = Angles.trnsx(rot, trns), ty = Angles.trnsy(rot, trns);
+
+                //TODO merge outlines?
+                Draw.rect(regions[i], unit.x + tx, unit.y + ty, rot - 90);
+            }
+        }
+    }
+
     public void drawMech(Mechc mech){
         Unit unit = (Unit)mech;