Mot [Lexaloffle Blog Feed]

Instant Replays!

Sun, 06 Feb 2022 08:55:00 UTC

Add an instant replay to your game!

New from the mind that brought you Instant 3D! and still hasn't apologized, Instant Replays!

Paste this snippet into the end of your game and be amazed at your new replay capabilities!!! Or it could fail completely! That's the mystery of it!!!

do
 local prev={
  _update=_update,
  _update60=_update60,
  _draw=_draw,
  btn=btn,
  btnp=btnp
 }

 local bstate,pstate,addr,isplay={},{},0x8000,false

 local function updatebtns()
  for i=0,5 do
   pstate[i]=bstate[i]
  end   
  if isplay then
   local mask=peek(addr) addr+=1
   if(mask==0xff)run()
   for i=0,5 do
    bstate[i]=mask&(1<<i)~=0
   end
  else
   local mask=0
   for i=0,5 do
    bstate[i]=prev.btn(i)
    if(bstate[i]) mask|=1<<i
   end
   if addr<0x8000+0x42ff then
       poke(addr,mask) addr+=1
      end
  end
 end

 local function doreplay()
  poke(addr,0xff)
  memcpy(0,0x8000,0x4300)
  cstore(0,0,0x4300,"mot_replay.p8")
  dset(63,1)
  run()
 end

 cartdata("replay")
 cartdata=function() end
 isplay=dget(63)==1
 if not isplay then
  local seed=rnd(0xffff.ffff)
  poke4(addr,seed)addr+=4
  srand(seed)
  menuitem(5,"replay",doreplay)
 else
  reload(0,0,0x4300,"mot_replay.p8")
  memcpy(0x8000,0,0x4300)
  reload(0,0,0x4300)  
  local seed=peek4(addr)addr+=4
  srand(seed)
  menuitem(5,"end replay",function()dset(63,0)run()end)
 end

 if _update then
  _update=function()
   updatebtns()
   prev._update()
  end
 end

 if _update60 then
  _update60=function()
   updatebtns()
   prev._update60()
  end
 end

 btn=function(i)
  return bstate[i]
 end

 btnp=function(i)
  return bstate[i] and not pstate[i]
 end

 _draw=function()
  prev._draw()
  camera()
  clip()
  if isplay then 
   print("replay",103,121,8)
  else
      print(((addr-0x8000)/0x4300*100\1).."%",115,121,8)
     end
 end
end

Okay, I've exceeded by exclamation point quota.

This is a little experiment in capturing the player's input and replaying it exactly as before in order to make the game play out exactly the same way - assuming everything goes to plan.

To use, paste the snippet into the end of you cart, after the existing code. Then play the game for a minute and select "Replay" from the pause menu. The replay will continue looping until you select "End replay" from the pause menu.

Note - There are a bunch of requirements/caveats for this to actually work:

Your game must be controlled by the player 1 gamepad only. Player 2 controls, mouse, keyboard etc is not captured.
Pico-8 must be able to read/write to an external cart (named "mot_replay.p8"). I don't think this will work in binary/web exports.
Your game must not use:
- Pico-8 memory above 0x8000
- Menu item slot 5
- Cart data slot 63
The snippet will hijack your cart data and use cartdata("replay") instead
Replays cut off after 10 minutes or so due to limited storage space.

And there's probably other ways it can fail that I haven't thought of :-). Try it and see..

A few games it seems to work with:

Harold's Bad Day by @biovoid

Phoenix by @pahammond
(Had to remove the cartdata() call from the snippet)

Ninja Cat by @cubee
(Had to remove the cartdata() call from the snippet)

Super Disc Box by @Farbs

Mot's Grand Prix track editor

Thu, 30 Sep 2021 23:37:44 UTC

mot_grandprix_editor

by Mot

[Click to Play]

This is the track editor for Mot's Grand Prix

I don't recommend running this in browser as you cannot save/load tracks - anything you build will be lost.
Rather download the file and run it in Pico-8 itself.
You will also need to download the main game and run it in Pico-8 in order to race on any tracks you create.

This editor requires a keyboard and mouse.

Existing tracks

You can download the tracks from the existing game from this Google Drive folder. Place them in your carts folder (next to the editor) then select "Load" from the editor hamburger menu (top right) to load them.

Basic usage

IMPORTANT: There are known bugs that will crash the editor, so save often!

Use the arrow keys to scroll along the track.
Use the hamburger menu (top right) to load save and export tracks.
The "New" menu creates new stages, curves and items (described in detail further down).
Click "Drive" to drive on the track (select "Editor" from the pause menu to return to the editor).
Select things by clicking on them. You can then edit their properties, or delete them by clicking "-".
After making a change you usually have to click "Update" (bottom right) to update the visual model (I didn't have enough tokens to make this automatic).

Track format

The basic components of a race track are:

Stages
Curves
Items

Stages

Are used to partition the race track. Every track must have at least one stage.
The advantage of having multiple stages is that their curves and items are stored independently of the other stages, so if you modify the curves in a stage you only need to fixup the positions of the background items within that stage. Also they can help you keep track of what part of the track you are working on.

Click "New->Stage" to add a new stage. The new stage will be inserted immediately after the current stage.

The current stage is displayed top-left underneath the menu bar.

You can click on the name to edit it. Or click "-" to delete it.
Deleting a stage deletes all its curves and background items, so be careful.

Curves

Curves define the shape of the race track, i.e. the corners, straights, hills, valleys etc.
Note: Despite the name a "curve" doesn't have to actually curve. It can be completely straight.

Click on the race track itself to select a curve.

Click "New->Curve" to add a new curve.
If a curve is already selected, the new curve will be inserted immediately before it in the current stage.
If no curve is selected, the new curve will be added to the end of the current stage.
To delete the curve, select it and click the "-" button next to the curve (NOT the one next to the stage!)

Edit the curves properties to modify it.
Most properties are edited using sliders. Drag with the left mouse for small increments and right mouse for large.
Remember to click "Update" to see the result of a change.

Length = Length of the curve in units (units are about 4-10 meters long - scale isn't very accurate in this game)
Turn = How sharply the road turns. 0 is straight, negative values turn left, positive turn right.
For reference the hairpin turn in "Suzuka" is -0.32, which is close to the limit of how sharply cars can corner in this game.
Pitch = Vertical gradient. 0 is flat, -1 is up 45 degrees, 1 is down 45 degrees.
Pitch is an optional property. Tick the tick-box to enable it. If omitted the pitch from the previous curve will be used.
Pitch is linearly interpolated. The value you set is actually the pitch at the end of the current curve. It will smoothly transition from the previous pitch to that value across the curve.
Left/Right = Define the horizontal range, i.e. how far left/right cars can go without crashing into a barrier.
The left and right barriers are visually represented by the "L Barrier" and "R Barrier" settings below. It's a good idea to set these - otherwise the player will simply crash into an invisible barrier.
The road is 8 units wide, so the "Left" usually is -4 or less, and right 4 or greater, although they can be set to -3/3 to clip into the gravelly region of the road. The AI cars expect the full width of the road to be available though, so be careful when doing this.
Left/right are also optional, linearly interpolated properties.
L Barrier/R Barrier = Define the visual left and right barriers. Each one is a list of item types that will be repeated. Tick the tick box to specify the barrier type, then click "[New]" to add an item type.
Select the item type from the list (use the mouse wheel to scroll). Make sure to only select item types starting with "Barrier_" (I didn't have enough tokens to automatically filter the list).
Generally it makes sense to use just one barrier types, or combine "Barrier_Fence" with one of the other types.
L Barrier/R Barrier are optional.
Trees = Generate random trees on the left/right side of the map.
This is a list of horizontal positions to place the trees at trees' horizontal positions vary randomly by a few units as well.
Trees are optional.

Items

Items are background items, like stadiums, buildings, signs. They don't affect gameplay, but make the track look more alive.
Click on a background item to select it.
You can also use the "<" and ">" buttons to cycle through the items in a stage (useful if you accidentally place one in a position where it is never visible and can't be selected normally).
Click "New->Item" to create a new item, then select the item type from the list (mouse wheel to scroll).
The item will be created in the current stage, a few units in front of the camera.
To delete the item, click the "-" button next to it.

Background items have 3 properties representing their position relative to the race track.

X = Horizontal position relative to the race track (negative = left, positive = right)
Y = Vertical position relative to the ground (negative = up, positive = down)
Z = Distance along track from start of stage.

Other properties

You can also edit the sky and ground colours by selecting "Properties" in the hamburger menu.

Generated content

The following items are generated automatically and cannot be edited:

Race track shoulder things (I tried to Google for the proper name, but only found things that stop horses from biting your shoulders...)
Distance to turn signs
Racing line markers

Exporting

To race on your track in the actual game, you need to export it:

Click "Export" in the hamburger menu. This will copy a string to the clipboard.
Open up "Mot's Grand Prix" in Pico-8.
Open tab 8.
Choose a track to replace (there isn't enough compressed space left to add any more).
Replace the string for one of the existing tracks. Be sure to switch to "Puny font" mode (press Ctrl+P) before pasting from the clipboard.
Optionally edit the "finline" variable to set the finish line distance.
If you want to change the track name on the start screen, edit the "tracknames" variable in tab 1.

Your track should now be in the game.

Mot's Grand Prix

Tue, 21 Sep 2021 12:36:25 UTC

Mot's Grand Prix

by Mot

[Click to Play]

Title screen artwork by Marco Vale

Update: The track editor is now available here.

Update 2: Added Autodromo Nazionale di Monza circuit

Update 3: Added last two tracks (Hockenheim and Spa Francorchamps) plus championship mode. The BBS version now plays identically to the itch.io multi-cart version.

Step back in time to an era when folk were real folk and racecar steering wheels were real steering wheels.
Mot's Grand Prix is a pseudo 3D Formula 1 racer inspired by Grand Prix Circuit, Continental Circus and a bunch of other 80s/90s racers I've forgotten :).

Strap into your single seater and blast around 6 classic race courses:

Brands Hatch
Hockenheim (old layout)
Autodromo Nazionale Monza
Silverstone
Spa Francorchamps
Suzuka

Or enter the championship and try to be top of the points table at the end of the season.

The game has 4 difficulty levels plus a practice mode to learn the courses without the pressure of racing.

Controls

Left/Right = Steer
Z/Up = Accelerate
X/Down = Brake

Mouse control

You can also enable mouse control in the pause menu. It has 3 settings:

Off = No mouse control. Keys/gamepad only.
Steering = Mouse controls steering (left/right axis). Keys/gamepad controls acceleration/braking.
Full = Mouse controls steering (left/right axis) and acceleration/braking (up/down axis).

"Steering" mode can be quite playable if you use a large window size or full-screen mode. Use the keyboard keys to accelerate/brake as usual.
"Full" mode is not really playable unless you're some kind of robot, but can be useful for other input devices if they can be configured to output mouse movements (e.g. a Steam controller).

Tips

This is a game where you have to slow down for the corners!
Use the colour of the racing line to judge your speed.

Green -> You are fine
Yellow -> You are close to the limit, but should be able to make the turn
Red -> You are likely going too fast for the corner

If you're really having trouble, you can switch on "Auto Brake" in the pause menu. Auto-brake automatically slows you down for corners, but not to avoid crashing into other cars.

Don't be timid about muscling through traffic
There is no damage model. Your car is indestructible. Be fearless! :-)

Hope you enjoy this game.
-Mot

Feature suggestion - Enhanced controller input

Tue, 17 Aug 2021 12:48:22 UTC

Just a suggestion, but for modern controllers it would be really nice if the extra controls could be mapped like:

Right trigger = X
Left trigger = O
Right thumbstick = Mouse

That would allow FPS games like Poom, Sorcerer to be played like a twin stick shooter on capable input devices, without actually changing Pico-8's input model.

Variable inspector (debugging)

Mon, 26 Jul 2021 07:12:46 UTC

This is a cut down version of the variable inspector I wrote a while ago. It's a bit more limited, but a lot more light weight. And there's a way to use it even if you have no tokens to spare (described below).

You use it to view Lua table variables:

Run your game
Press Esc to break into it
Type: dinsp(variable)

Then use the mouse to expand values and scroll wheel to scroll up/down.

Code snippet follows (for some reason I can't use the code formatting tags):

poke(0x5f2d,3)cursor()pal()clip()function dadd(n,v,i,p)add(lines,{n=n,v=v,x=type(v)=="table"and"+"or" ",i=i},p) end function dexp(l,p)if l.x=="+" then for n,v in pairs(l.v) do p+=1 dadd(n,v,l.i.." ",p)end l.x="-"end end

function dinp()local x,y,b,w=stat(32),stat(33),stat(34),stat(36)line(x,y,x,y+2,10)if btnp(❎) then local i=(y-10)\6+1 local p=s+i local l=lines[p]if l and (x-10)\4==#l.i then dexp(l,p)end end s=max(min(s-stat(36),#lines-18),0)end

function dui()while true do rectfill(10,10,118,118,1)for i=1,18 do local l=lines[i+s]if l then print(l.i..l.x..l.n..":"..tostr(l.v),10,(i-1)*6+10,7)end end dinp()flip() end end function dinsp(v)lines,s={},0 dadd("value",v,"",#lines+1)dui()end

The snippet is 246 tokens.
If you don't have 246 spare tokens, you can still use it as follows:

Run your game
Press Esc to break into it
Paste in each of the 3 snippet lines one at a time, pressing enter after each.
Type: dinsp(variable)

The snippet must be entered as 3 separate lines because Pico-8 has a 255 character limit for lines in immediate mode.

Feature request: Metronome in sfx editor

Sun, 18 Jul 2021 08:41:58 UTC

This is a suggestion, not a bug obviously.

The ability to toggle on a metronome tick/beep every 4 beats in the sfx editor would be quite helpful for composing tunes.

Trial of the Sorcerer

Fri, 16 Jul 2021 05:45:28 UTC

Trial of the Sorcerer

by Mot

[Click to Play]

UPDATE: The dungeon generation logic has been revamped. Rooms are not always rectangular, and can often have a bit more cover (or hiding places for monsters). Also added a couple of new enemy types. Gold has been removed (I needed the extra tokens), but it didn't really do anything anyway.

Grab your magic staff and venture deep into the demon realm to defeat Bahmott and his evil servants!

Trial of the Sorcerer is a procedurally generated 3D first person shooter inspired by Wolfenstein 3D and Catacomb Abyss.

Shoot monsters, collect loot, find keys to unlock doors, and try to find the exit to the next level.
And don't forget to pickup the power crystals to level-up your magic staff along the way.

Input

Arrows = Move
X = Shoot
Z = Hold to strafe

Or use player 2 controls (E,S,D,F) to move/strafe and player 1 controls to turn.

Mouse input can be enabled via the pause menu (once in game), but only when playing via the Pico-8 application as mouse locking doesn't currently work in the browser version.

Tips

Doors with a small black keyhole require keys.
Each door requires a specific key, so if one won't open it means you don't have the right key yet.

Crypts of Mot

Tue, 29 Jun 2021 09:35:21 UTC

Crypts of Mot

by Mot

[Click to Play]

Still needs quite a bit of finishing off.
I'm posting it now mainly so I can play it on my phone :-)

Levels are randomly generated. Shoot monsters, collect loot, find keys to unlock doors and reach the exit.

Formula 1 practice lap

Sun, 14 Feb 2021 03:01:03 UTC

mot_formula1

by Mot

[Click to Play]

Strap into one of the world's fastest race cars and blast around the legendary Bronzerock circuit like it's 1988!
...or something - there's not a lot of physical or historical accuracy in this game :)

Z/X=accelerate/brake
Left/right=steering

Driving off road slows you down. Driving too fast around corners causes you to slide.

You can use the pause menu to view your last/best lap times (my best so far is 1:43.23)

This is work-in-progress, so some caveats:

There are no other cars yet.
Lots of things need tweaking/adjusting.

F1 racing game

Fri, 05 Feb 2021 21:12:03 UTC

F1 racing game

by Mot

[Click to Play]

This is very unfinished and I wasn't planning to release this just yet, but somebody asked to play it so here it is :-)

Z/X accel/brake
Left/right to steer

Eventually there will be consequences for leaving the road and crashing into things.

Mot's Wolf3D engine

Fri, 29 Jan 2021 07:19:44 UTC

Mot's Wolf-3D engine

by Mot

[Click to Play]

This isn't really a game - unless you consider it a short "Walking simulator" - it's more of a tech demo.

The engine is a basic Wolfenstein-3D like 3D engine. It has floor and ceiling textures and render reasonably sized and complex rooms at 60 frames-per-second, in a 128x96 viewport.

Arrow keys = move
X = toggle map mode

If anyone feels like something out of it, it's fairly easy to get started with (details below).

Flight simmy

Fri, 27 Nov 2020 07:47:28 UTC

mot_flight

by Mot

[Click to Play]

A little arcady "flight sim" I started writing.
Buzz past randomly generated islands in a wrap-around ocean.

I will probably add stuff to blow up eventually :)

There is no throttle! Just steer with arrows.

Mot's 8-Ball Pool

Thu, 08 Oct 2020 08:05:51 UTC

Pool

by Mot

[Click to Play]

This is Mot's 8-Ball Pool, a little pool simulation inspired by 3D pool on the C64 and Amiga.
Shoot a round of pool against a friend, or one of the 7 different AI characters.

UI

The UI at the bottom of the screen shows how each player is progressing.
The player's name flashes when it is their turn.
The color they must sink is displayed next to their name, and the balls already sunk are displayed above.
A white ball indicates they have a free ball.

When player fouls, the reason for the foul is displayed in a scrolling message along the bottom of the screen.

Rules

I'll assume you know the basic rules of 8-ball pool, so I'll just describe how the rules have been implemented.
The game uses a simplified set of rules:

The game ends when the black ball is sunk.
If you sink it (legally) after sinking all your colored balls, you win. Otherwise you forfeit and your opponent wins.
The first ball sunk becomes that player's color.
A legal shot involves hitting a ball of your color first, and not sinking the wrong color, white ball or black ball (except when you're supposed to).
A free ball is awarded to the other player after a "foul". A free ball means you get a free second shot even if you don't sink a ball - as long as your shot was legal.

Hope you enjoy it.
If you're curious, you can see the development progress in this Twitter thread.

Still Movin'

Sun, 20 Sep 2020 04:27:06 UTC

[sfx]

I felt like transcribing a little tune I made in Caustic to Pico8.
Could use a bit more work (instruments, balancing, is pattern 14 off key?) but I'm happy enough with it.

Pool

Mon, 31 Aug 2020 11:55:35 UTC

Pool

by Mot

[Click to Play]

A work-in-progress 3D pool table simulation.

smap - sspr for maps

Wed, 22 Jul 2020 05:44:11 UTC

Not sure if anyone has posted a smap() yet, but it's reasonably straightforward to implement with tline, so here's mine.

Parameters are:
cx,cy,cw,ch Specify a region in the tile map. Measured in tiles.
sx,sy,sw,sh Region on the screen to map to.
flipx,flipy Whether to flip horizontally and/or vertically.
layers Layer flags. Same as for map().

You need to supply at least the c and s parameters.

function smap(cx,cy,cw,ch,sx,sy,sw,sh,flipx,flipy,layers)

 -- negative screen sizes
 if(sw<0)flipx=not flipx sx+=sw
 if(sh<0)flipy=not flipy sy+=sh
 sw,sh=abs(sw),abs(sh)

 -- delta
 local dx,dy=cw/sw,ch/sh

 -- apply flip
 if flipx then
  cx+=cw
  dx=-dx
 end
 if flipy then
  cy+=ch
  dy=-dy
 end

 -- clip
 if(sx<0)cx-=sx*dx sx=0
 if(sy<0)cy-=sy*dy sy=0
 if(sw>128)sw=128
 if(sh>128)sh=128

 -- render with tlines
 -- pick direction that results
 -- in fewest tline calls
 if sh<sw then
  -- horizontal lines
  for y=sy,sy+sh-1 do
   tline(sx,y,sx+sw-1,y,cx,cy,dx,0,layers)
   cy+=dy
  end
 else
  -- vertical lines
  for x=sx,sx+sw-1 do
   tline(x,sy,x,sy+sh-1,cx,cy,0,dy,layers)
   cx+=dx
  end   
 end
end

mot_smap

by Mot

[Click to Play]

Mot's Animation System

Sun, 12 Jul 2020 00:44:07 UTC

Mot's Animation System

Mot's Animation System

by Mot

[Click to Play]

Mot's Animation System is a visual editor for creating 2D animations.

You start by sequencing sprites and/or tilemaps together to create the basic components. Then combine them using timelines and key-frames to make animations. Or combine them again to make bigger, more complex animations.

Animations can trigger sounds and music, and call back into to your main program, e.g. to trigger game play events.

You could use it for:

Character animations, like run cycles
Larger multi-sprite animated characters
Cutscenes
Animated birthday cards

Animations can be loaded and played in your own carts (the loading and playback code is 1836 tokens). They can either be stored in Lua strings or loaded from a separate cart.

Disclaimer

This is all very much in Beta at the moment!. And some corners had to be cut to fit everything into the token limit. In particular the editor doesn't prevent you from shooting yourself in the foot by:

Creating self referencing animations (infinite recursion)
Creating animation files larger than 0x4300 bytes (about 17K) that won't save properly.

It lacks any sort of undo/redo logic, so if you use this, please take frequent backups of your saved animations.

And also, because the animation code is 1836 tokens and the animation data can be several kilobytes, it's not the best fit for every program.

Feel free to @ me if you need any help.

Overview and basic navigation

Creating animations

Importing graphics

Clearing animations

Saving and loading

Sprite animations

Sprite (and tile map) animations are the building blocks of all animated sequences.
Create a sprite animation by clicking the hamburger icon and selecting "NEW SPRITE ANIM".
To edit the animation, make sure the "Properties" section is expanded.

This UI allows you to define a sequence of frames, each of which displays a sprite.
The frames of the animation are displayed horizontally.

Click on a frame to select it.
If the animation has more than 5 frames, click the rightmost frame to scroll right and the leftmost to scroll left.

The "+" and "-" buttons add and delete frames respectively. Adding always creates a new frame at the end of the animation. Alternatively you can insert a new frame immediately after the selected frame by clicking "Ins".

The bottom of the editor shows the available sprites.

As in Pico-8 itself, sprites are grouped into 4 pages, with page number "tabs" at the top right.
To set the sprite for a particular frame, first click on the frame, and then click on the sprite in the sprites area.
The sprite for the current frame is displayed with a white rectangle.

You can also flip a frame horizontally or vertically by ticking "Flip X" and "Flip Y" respectively while the frame is selected.

Information and settings

Click the I icon on the "Properties" bar to display the sprite animation information and settings.

The Name allows you to give your animation a name, so you can find it more easily in the animation chooser.
You should try to choose short names in order to save space and so that they display properly in the animation list. (Ideally the editor would enforce this but it doesn't have enough spare tokens.)
The name is also used to fetch animations when rendering them in your own carts, so it is a good idea to give each animation a unique one.

The Type allows you to choose between a sprite or tile map based animation. (Tile map animations are described in the next section.)

FPS is the frames-per-second speed of the animation.
The value is set using a "number editor" box. Click and drag left/right to decrease/increase the value. Click and drag with the right mouse button to decrease/increase 10x faster.

Size is the horizontal (left box) and vertical (right box) size of each frame in sprites (or tile map tiles, if using a tile map animation).

The Origin defines the origin point of the animation. If the animation is rendered at coordinates X,Y then the origin is the part of the animation that will align with that position on screen. It is also the part of the animation that stays in the same place if you scale it larger or smaller. It's stored as two values ranging from 0 to 1, representing the fraction of the animation's width and height. So (0,0) sets the top left corner as the origin. (1,1) sets the bottom right corner. (0.5,0.5) sets the center.

Hover the mouse over the animation preview area to see the origin point (displayed as a gray cross)

Tile map animations

Timeline animations

This is the main feature of the animation system: the ability to create animations defined by key frames on a timeline.
Timeline animations are built from other animations, which are often sprite animations but can be other timeline animations as well. In this section we will refer to the other animations as "child animations".
The key frames specify which animations to play at which positions, plus other attributes like scale and flip flags. The animation system interpolates between these values based to create the animation.

Create a timeline animation by clicking the hamburger icon and selecting "NEW TIMELINE ANIM".

The timeline animation UI has two main areas.

Timelines and key frames

The left area contains the timelines and key frames.

The blue top line is for triggering events, like sound effects. This is covered later on.

The gray lines are timelines. Each one displays a single "child" animation. You can include more child animations by creating more timelines, using the buttons at the bottom.

The + and - buttons add and delete timelines respectively.
Use the up and down arrows to re-order the timelines. This controls the order that the child animations are drawn on screen. Timelines are drawn from top to bottom, so the topmost timeline's animation will appear behind the others, and the bottom timeline's animation will appear in front.

The purple dots on the timeline are key frames.
These can be added and deleted with the key frame buttons:

To insert a key frame, first click on the timeline at the position corresponding to the desired time. Then click +.
Note: If key frames are close together it may be difficult or impossible to click on the timeline between them without selecting one of the existing ones. The work around is to click + to create the new key frame anyway, then move it to the desired time.

To delete a key frame, click on it to select it, then click -.

Key frame properties

The right hand side displays the properties of the selected key frame.

Use the number box at the top to set the key frame time on the timeline (drag left/right with the mouse).
(I would have preferred to implement this as dragging the key frame along the timeline, but you know... tokens.)

The key frame properties are grouped into two tabs, which are accesed by clicking the icons to the right of the number box.

The first tab () has the following properties:

Anm selects which child animation to play. Click on the animation name to select it from the list. The child animation will play from this key frame onward. If "None" is selected, the key frame will not change the child animation.

Loop indicates whether the child animation will loop. If not it will stop once it has played to the end (or start if playing backwards).

T and Spd set the time and speed of the child animation. You can use these to start the child animation half way through, or play it in reverse, or double speed etc.
T and Spd are optional properties. This means you can choose not to specify them on a particular key frame, which is useful if you want to add a key frame to change a different property (say the on-screen position). Optional properties are controlled by a tick box on the right hand side which must be ticked in order to enter a value.
For T and Spd there is only one tick box, as you must either set them both, or none at all.

Visible indicates whether the child animation is visible from this key frame onward.

Click the icon to display the second tab.

It has the following properties:

Pos sets the position of the child animation as a X and Y coordinates, relative to the center of the current time line animation. If you render the animation in the center of the screen (like the editor does by default), then 0,0 will position the child animation there.
Pos is an optional property.
It is also an interpolated property. As the animation plays the position will be linearly interpolated between the values supplied on the key frames, so that the child animation moves smoothly from one position to the next.

Sca sets the horizontal and vertical scale factor of the child animation. A value of 1 means no scaling.
Sca is an optional interpolated property.

Flp flips the child animation horizontally and/or vertically from the current key frame onward.

Note: The Visible property is also available on this tab page. It is the same property as on the other page.

Information and settings

As with sprite animations you can click the I icon to display the information and settings.

Refer to the sprite animation section regarding the Name property.

The Duration allows you to specify the animation duration in seconds.

Storyboard animations

Animation events

Playing animations in your own carts

Loading and playback code

Loading from an external cart

Rendering an animation

Drawing text

Handling animation events

Embedding animations as Lua strings

Instead of loading animation data from an external cart, you can embed it directly into your Lua source as hexidecimal strings, to create a single self-contained cart.

For example, here's the demo animation embedded into a cart as a Lua string:

Mot's Animation System - Demo animation

by Mot

[Click to Play]

You will need enough free space to fit the strings in without exceeding the compressed size limit however.

To generate the Lua strings you must run Pico-8 in console mode.
Load your animation in the editor, then click the hamburger icon and select "EXPORT ANIMS".

The editor will write a table of hexidecimal strings to the console window. This looks like (on Windows anyway):

INFO: {
INFO:  "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",
INFO:  "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",
INFO:  "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",
INFO:  "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",
INFO:  "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",
INFO:  "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",
INFO:  "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",
INFO:  "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",
INFO:  "",
INFO:  "",
INFO:  "",
INFO:  "",
INFO:  "",
INFO:  "",
INFO:  "",
INFO:  "",
INFO:  ""}

You will need to copy it from the console window and remove the "INFO: " line prefixes. You can optionally remove any blank strings at the end of the table.

Then add it to your code, assigning it to a variable. For example:

animdata={
"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",
"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",
"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",
"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",
"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",
"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",
"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",
"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"
}

You can now use the following code to load the animations:

    -- load animation from animdata string
    local stream=readstrstream(animdata)
    anims=loadanims(stream)

    -- extract animation to play    
    anim=anims["intro"]

Playing Ramps with a racing wheel

Sat, 06 Jun 2020 01:58:54 UTC

OK, this may be a bit bonkers, but I figured out how to play Ramps with a racing wheel, with proper analogue steering and acceleration/braking.

It's a little involved and only works on Windows.

Mouse input

First, you need a version of Ramps (or whatever game you plan to play) edited to accept mouse input. Like this version:

Ramps - with mouse input

by Mot

[Click to Play]

WARNING: Attempting to drive with an actual mouse may cause high blood pressure and throwing things.
Also I've only tried this in PICO-8 itself - not sure if it works when running in a browser.

Joystick -> mouse

Next, you need a utility to convert game controller input to mouse movement.

I couldn't find one that did exactly what I needed, so I ended up making my own here.
Tip: If you try it out remember F12 toggles it on/off - as you can't use the mouse when it's enabled.

Race

So basically run the utility, run the mouse-input version of Ramps in PICO-8, switch to full-screen, and go :-)

Suggestion: UDP/IP networking

Fri, 05 Jun 2020 09:36:53 UTC

I'm a bit new here, so I don't know if adding network capability has previously been discussed (?)

But it feels to me some simple UDP send/receive instructions would add some cool functionality, without adding too much complexity.

Perhaps something like:

[write message to RAM]
poke4([ip-locn],ip)
poke2([port-locn],port)
send(0x4300,length)

Where [ip-locn],[port-locn] would be some special reserved locations for IP address and port.
UDP packets are usually small. I've seen <=512 bytes recommended in places, which easily fits into the user RAM address range.
And an IPV4 address would fit in a number variable, and would be adequate for LAN play.

Receive could be:

length=recv(0x4300,maxlength)
[read message from RAM]

Returning 0 if nothing is waiting.
It could also populate [ip-locn] with the return IP address so that replying would be straightforward.

Perhaps [port-locn] could be pre-populated with a default port number (0x1C08 ?).

Any thoughts?
Am I trying to make it simpler than is actually possible? (I haven't done socket programming in a while, so I forget what's necessary to get UDP/IP working).

Ramps

Sun, 31 May 2020 05:23:50 UTC

Ramps

Ramps

by Mot

[Click to Play]

This is Ramps! A 3D racer inspired by Powerdrift, Stunt Car Racer, Hard Drivin'.

Choose from 8 varied race tracks, and overtake the other drivers in 5 laps to win.
As well as racing you'll need to navigate jumps, roller-coaster like ramps and occasionally even drive upside down.

Includes 3 difficulty levels, plus a practice mode for getting the feel of the tracks.

This all started as an experiment to see how well Pico-8 could render a Powerdrift-like scaled sprite racetrack (pretty well, as it turns out). Then it was about trying to implement a driving model that could handle the ramps, jumps and loops. And finally wrapping it up into a somewhat finished game.

Like with Loose Gravel, I would have liked to add a championship mode, but there just aren't enough tokens :-)

Big thanks to everybody who gave advice and feedback. Particularly @freds72 who even went as far as digging into the code and making some performance optimisations (~20% CPU improvement!).

Tips

Z = Accelerate
X = Brake
Left/Right to steer

You don't have to wait to be automatically respawned after you fall of the track, select "Respawn" in the pause menu to get back into the race faster.

The green and red lines on the speedometer are recommended minimum and maximum speeds.
The green line (minimum speed) is particularly important for clearing jumps (and occasionally getting up steep hills), so make sure to keep your speed above it.
The red line (maximum speed) is to prevent you from sliding out on sharp corners or overshooting the jumps. Typically this is just a suggested speed. Depending on your racing line, driving style etc you may be able to go faster.

Enjoy,
-Mot

Update: Other cars' speeds now vary randomly throughout the race
Update 2: Can knock other cars sideways a bit & they don't knock you sideways as much. Round road sprite corners a bit.
Update 3: Fix game crashes in AI code when road is blocked.

Mot [Lexaloffle Blog Feed]

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Ramps

Ramps

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