====== Part 16 - Jelly Monsters ======

We need something to create challenge in the game. Alien jelly monsters are the obvious choice. Lots of them. Here's a sprite sheet for the monsters:

{{ :guides:beginners:monster.png?nolink |}}

Right click and save to the ''data/texture'' folder in our project as "monster.png".

Create a graphic from the sprite sheet in the config:

<code=ini>
[MonsterGraphic]
Texture		= monster.png
TextureOrigin	= (0, 0, 0) ;required by the animation system for sizing.
TextureSize	= (32, 32, 0)
Pivot		= center
</code>

We need an object:

<code=ini>
[MonsterObject]
Graphic      = MonsterGraphic
AnimationSet = MonsterAnimationSet
Position     = (-310, -210, 0)
Scale        = 2.0
</code>

Then to define the animation set and the one animation we need:

<code=ini>
[MonsterAnimationSet]
Texture			= monster.png
KeyDuration             = 0.1
FrameSize		= (32, 32, 0)
MonsterWobbleAnim	= -1 ;use the entire sheet
StartAnim		= MonsterWobbleAnim
MonsterWobbleAnim->	= MonsterWobbleAnim
Pivot			= center

</code>

Just so you can see the monster working... add a MonsterObject to the Scene childlist:

<code=ini [highlight_lines_extra="5"]>
[Scene]
ChildList = PlatformObject # MiddlePlatformObject #
TopLeftPlatformObject # TopPlatformObject #
TopRightPlatformObject #
StarObject # MonsterObject
</code>

Run the game and you'll see a monster wobbling in the top left hand corner of the screen:

{{:guides:beginners:beginners-40-monster-placed.png?nolink|}}

We need more than one monster, very soon we'll make lots of them drop out of the sky.

Last job is to give the monster a body and ensure he collides with platforms, bullets, and our hero:

<code=ini [highlight_lines_extra="6"]>
[MonsterObject]
Graphic      = MonsterGraphic
AnimationSet = MonsterAnimationSet
Position     = (-310, -210, 0)
Scale        = 2.0
Body         = MonsterBody

[MonsterBody]
Dynamic  = true
PartList = MonsterBodyPart

[MonsterBodyPart]
Type        = box
Solid       = true
SelfFlags   = monster
CheckMask   = hero # platforms # bullet
</code>

And add ''monster'' to the ''PlatformBody'' so that collisions work on both object types:

<code=ini [highlight_lines_extra="5"]>
[PlatformBodyPart]
Type        = box
Solid       = true
SelfFlags   = platforms
CheckMask   = hero # monster
</code>

Run it again and the monster should drop down onto a platform.

{{:guides:beginners:beginners-41-monster-gravity.png?nolink|}}

----

Next: [[en:guides:beginners:timeline_tracks|Part 17 – Timeline Tracks]].

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