Death Barrier and Player Character Cheat Codes

* Added the Death Barrier to Play Mode to catch players from falling off
  the map and then falling indefinitely, especially on Unbounded maps.
* The Death Barrier is set 1,000 pixels below the lowest point on your
  map. If the player falls here they get a death message: "Watch out for
  falling off the map!"
* Added cheat codes to change the default Player Character doodad, as a
  way to force play as a different character (for levels which don't
  specify a custom character):
  * Play as Bird: fly like a bird
  * Play as Blue Azulian: the cell
  * Play as Thief: play as thief
  * Reset to default (Boy): pinocchio

Changes.md

@@ -1,5 +1,93 @@
 # Changes
 
+## v0.8.0 (TBD)
+
+To Do:
+* Thief needs animations
+* New levels
+
+This release brings some new features, new doodads, and new levels.
+
+New features:
+
+* **All Characters are Playable!** Use the Link Tool to connect your
+  Start Flag with another doodad on your level, and you will play
+  **as** that doodad when the level starts. The Creature doodads are
+  all intended to be fully functional; playing as buttons and doors
+  leads to strange results.
+
+New doodads have been added:
+
+* The **Anvil** is a heavy metal object which is affected by gravity.
+  It is harmless to collision, but if the anvil is in freefall, it
+  will destroy every mobile doodad that it touches, and is deadly
+  to the player character.
+* The **Electric Trapdoor** is a trapdoor that opens and closes when
+  powered by a button or switch. It is a horizontal version of the
+  Electric Door.
+* The **Thief** is a new character which will steal items from the
+  player or other mobile doodads. The Thief is able to pick up items
+  and unlock doors and he walks back and forth like the Azulians.
+* The **Blue Azulian** is now selectable from the Doodads menu. It
+  behaves like the Red Azulian but moves at half the speed. The
+  Azulians can pick up items and open doors.
+
+Some doodads have changed behavior:
+
+* The **Bird** can no longer pick up items, unless controlled by
+  the player character.
+* The **Anvil** and **Box** will reset to their original locations
+  if they receive a power signal from a linked button or switch.
+
+The user interface has been improved:
+
+* **Tabbed windows!** The Doodad Dropper window of the level editor
+  and the Settings window use new, tabbed interfaces.
+* **Doodad Categories:** the Doodad Dropper's tabs are divided into
+  a few major categories.
+    1. Objects: Anvil, Box, Crumbly Floor, and Flags
+    2. Doors: Doors, Trapdoors, and Keys
+    3. Gizmos: Buttons, Switches, Electric Doors, etc.
+    4. Creatures: Bird, Azulians, Thief
+    5. All: a classic view paging over all doodads (and doodads
+       not fitting any of the above categories).
+
+  doodad edit-doodad --tag "categories=doors,gizmos" filename.doodad
+
+New functions are available in the JavaScript API for custom doodads:
+
+* FailLevel(message string): global function that kills the player
+  with a custom death message.
+* Self.MoveTo(Point(x, y int))
+* Self.IsPlayer() bool
+* Self.SetInventory(bool): turn on or off inventory. Keys and other
+  items will now only give themselves to mobile doodads which have
+  inventory.
+* Self.HasInventory() bool
+* Self.AddItem(filename string, quantity int) - zero quantity for
+  permanent items like the colored keys.
+* Self.RemoveItem(filename string, quantity int)
+* Self.HasItem(filename string)
+* Self.Inventory() map[string]int
+
+The Events.OnLeave() callback now receives a CollideEvent argument,
+like OnCollide, instead of the useless actor ID string. Notable
+properties on the CollideEvent will be the .Actor which is leaving
+and Settled=true.
+
+Other miscellaneous changes:
+
+* The **Link Tool** can now un-link two doodads by clicking on
+  them again.
+* Actor UUIDs in your levels will now be Type 1 UUIDs (time-based)
+  instead of random. This will ensure each newly added doodad gets
+  a larger ID than the previous one, so in cases of draw order
+  conflicts or that sort of thing, the winner can be picked
+  deterministically (most recently added renders on top).
+* A **death barrier** will prevent Boy from falling forever on unbounded
+  maps should he somehow fall off the level. The death barrier is a
+  Y value 1,000 pixels below the lowest pixel on your map.
+
 ## v0.7.2 (July 19 2021)
 
 This release brings some new features and some new content.

pkg/cheats.go

@@ -1,5 +1,7 @@
 package doodle
 
+import "git.kirsle.net/apps/doodle/pkg/balance"
+
 // cheatCommand is a subroutine of the Command.Run() method of the Doodle
 // developer shell (commands.go). It looks for special cheat codes entered
 // into the command shell and executes them.
@@ -86,6 +88,22 @@ func (c Command) cheatCommand(d *Doodle) bool {
 			d.Flash("Use this cheat in Play Mode to clear your inventory.")
 		}
 
+	case "fly like a bird":
+		balance.PlayerCharacterDoodad = "bird-red.doodad"
+		d.Flash("Set default player character to Bird (red)")
+
+	case "pinocchio":
+		balance.PlayerCharacterDoodad = "boy.doodad"
+		d.Flash("Set default player character to Boy")
+
+	case "the cell":
+		balance.PlayerCharacterDoodad = "azu-blu.doodad"
+		d.Flash("Set default player character to Blue Azulian")
+
+	case "play as thief":
+		balance.PlayerCharacterDoodad = "thief.doodad"
+		d.Flash("Set default player character to Thief")
+
 	default:
 		return false
 	}

pkg/play_scene.go

@@ -31,6 +31,7 @@ type PlayScene struct {
 	drawing      *uix.Canvas
 	scripting    *scripting.Supervisor
 	running      bool
+	deathBarrier int // Y position of death barrier in case of falling OOB.
 
 	// UI widgets.
 	supervisor *ui.Supervisor
@@ -211,6 +212,12 @@ func (s *PlayScene) setupAsync(d *Doodle) error {
 		s.drawing.InstallActors(s.Level.Actors)
 	}
 
+	// Choose a death barrier in case the user falls off the map,
+	// so they don't fall forever.
+	worldSize := s.Level.Chunker.WorldSize()
+	s.deathBarrier = worldSize.H + 1000
+	log.Debug("Death barrier at %d", s.deathBarrier)
+
 	// Set the loading screen text with the level metadata.
 	loadscreen.SetSubtitle(
 		s.Level.Title,
@@ -257,7 +264,7 @@ func (s *PlayScene) setupPlayer() {
 		playerCharacterFilename = balance.PlayerCharacterDoodad
 
 		spawn     render.Point
-		flag      *level.Actor
+		flag      = &level.Actor{}
 		flagSize  = render.NewRect(86, 86) // TODO: start-flag.doodad is 86x86 px
 		flagCount int
 	)
@@ -483,6 +490,11 @@ func (s *PlayScene) Loop(d *Doodle, ev *event.State) error {
 			log.Error("Drawing loop error: %s", err.Error())
 		}
 
+		// Check if the player hit the death barrier.
+		if s.Player.Position().Y > s.deathBarrier {
+			s.DieByFire("falling off the map")
+		}
+
 		// Update the inventory HUD.
 		s.computeInventory()
 	}