Mining beam weapon

core/src/mindustry/type/weapons/MineWeapon.java

@@ -0,0 +1,66 @@
+package mindustry.type.weapons;
+
+import arc.graphics.g2d.*;
+import arc.math.*;
+import arc.util.*;
+import mindustry.entities.bullet.*;
+import mindustry.entities.units.*;
+import mindustry.gen.*;
+import mindustry.type.*;
+
+public class MineWeapon extends Weapon{
+    public MineWeapon(){
+        super();
+    }
+
+    public MineWeapon(String name){
+        super(name);
+    }
+
+    {
+        rotate = true;
+        noAttack = true;
+        predictTarget = false;
+        display = false;
+        bullet = new BulletType();
+        useAttackRange = false;
+    }
+
+    @Override
+    public void update(Unit unit, WeaponMount mount){
+        mount.shoot = false;
+        mount.rotate = true;
+
+        //always aim at build plan
+        if(unit.mining()){
+            mount.aimX = unit.mineTile().drawx();
+            mount.aimY = unit.mineTile().drawy();
+        }else{
+            //aim for front
+            float weaponRotation = unit.rotation - 90 + baseRotation;
+            mount.aimX = unit.x + Angles.trnsx(unit.rotation - 90, x, y) + Angles.trnsx(weaponRotation, this.shootX, this.shootY);
+            mount.aimY = unit.y + Angles.trnsy(unit.rotation - 90, x, y) + Angles.trnsy(weaponRotation, this.shootX, this.shootY);
+        }
+
+        super.update(unit, mount);
+    }
+
+    @Override
+    public void draw(Unit unit, WeaponMount mount){
+        super.draw(unit, mount);
+
+        if(unit.mining()){
+            float
+                z = Draw.z(),
+                rotation = unit.rotation - 90,
+                weaponRotation  = rotation + (rotate ? mount.rotation : 0),
+                wx = unit.x + Angles.trnsx(rotation, x, y) + Angles.trnsx(weaponRotation, 0, -mount.recoil),
+                wy = unit.y + Angles.trnsy(rotation, x, y) + Angles.trnsy(weaponRotation, 0, -mount.recoil),
+                px = wx + Angles.trnsx(weaponRotation, shootX, shootY),
+                py = wy + Angles.trnsy(weaponRotation, shootX, shootY);
+
+            unit.drawMiningBeam(px, py);
+            Draw.z(z);
+        }
+    }
+}