Slide 1

Slide 1 text

GAMEDEV IN ELM FROM ZERO TO GAMEJAM

Slide 2

Slide 2 text

DREAMS

Slide 3

Slide 3 text

LAST YEAR

Slide 4

Slide 4 text

No content

Slide 5

Slide 5 text

No content

Slide 6

Slide 6 text

No content

Slide 7

Slide 7 text

No content

Slide 8

Slide 8 text

WHAT CHANGED?

Slide 9

Slide 9 text

I JOINED A GAMEJAM

Slide 10

Slide 10 text

WHAT IS A GAMEJAM?

Slide 11

Slide 11 text

WHY GAMEJAMS?

Slide 12

Slide 12 text

THEY END

Slide 13

Slide 13 text

FOCUS

Slide 14

Slide 14 text

⏰"⏰

Slide 15

Slide 15 text

CLOSURE

Slide 16

Slide 16 text

COMMUNITY

Slide 17

Slide 17 text

WHERE DO I START?

Slide 18

Slide 18 text

The unexamined life is not worth living — Socrates

Slide 19

Slide 19 text

WHAT DO YOU WANT OUT OF IT?

Slide 20

Slide 20 text

SHIP A COMPLETED ARTIFACT

Slide 21

Slide 21 text

LEARN FUNDAMENTALS

Slide 22

Slide 22 text

LEARN NEW TECHNIQUES

Slide 23

Slide 23 text

LIFE BALANCE

Slide 24

Slide 24 text

FIND JAMS ON ITCH.IO

Slide 25

Slide 25 text

#mytholojam

Slide 26

Slide 26 text

LET'S GET STARTED!

Slide 27

Slide 27 text

RUTHLESSLY SMALL SCOPE

Slide 28

Slide 28 text

NOW CUT SOME MORE

Slide 29

Slide 29 text

WHAT IS THE CORE MECHANIC?

Slide 30

Slide 30 text

SAFE TEA Puzzle game where user attempts to find the optimal tower placement to prevent the pirate(s) from arriving at their goal.

Slide 31

Slide 31 text

PATH TO SUCCESS 1. Place tower 2. Pirates move towards goal 3. Towers shoot pirate 4. Win if pirate is hit 5. Lose if pirate arrives at destination

Slide 32

Slide 32 text

OBVIOUS THINGS WE CAN CUT > Multiple tower types > Multiple levels > Tower upgrades > Waves of pirates

Slide 33

Slide 33 text

LESS OBVIOUS THINGS WE CAN CUT > Pirate AI > Cannonball collision detection > Multiple towers, multiple pirates

Slide 34

Slide 34 text

IT'S OK TO HARD-CODE AND BRUTE-FORCE

Slide 35

Slide 35 text

"TECHNICALLY PLAYABLE"

Slide 36

Slide 36 text

BIG FAN OF ITERATIVE APPROACH

Slide 37

Slide 37 text

GAME LOOPS

Slide 38

Slide 38 text

No content

Slide 39

Slide 39 text

USE Msg TO DRIVE YOUR LOOP type Msg = UserInitiatedDiceRoll | RandomDiceRollComplete Int | UserEndedTurn

Slide 40

Slide 40 text

DRIVEN BY THE USER

Slide 41

Slide 41 text

type Msg = SelectDeck Card.Deck | StartPlaying GameState | PlayCard Int Card | SelectCard Int | PlayCardToSlot Int Card GameSlot | EndTurn

Slide 42

Slide 42 text

REAL TIME

Slide 43

Slide 43 text

DRIVEN BY THE CLOCK

Slide 44

Slide 44 text

subscriptions : Model -> Sub Msg subscriptions model = Browser.Events.onAnimationFrameDelta Tick

Slide 45

Slide 45 text

SAFE TEA type Msg = Tick Float | MouseMove Mouse.Position | PlaceTower | StartPlacement

Slide 46

Slide 46 text

DOWN THE RIVER type Msg = Tick Float | Move Game.YDirection | NewSection Section | StartGame

Slide 47

Slide 47 text

GRAPHICS

Slide 48

Slide 48 text

EASY TO WASTE TIME

Slide 49

Slide 49 text

PLACEHOLDERS

Slide 50

Slide 50 text

No content

Slide 51

Slide 51 text

No content

Slide 52

Slide 52 text

I'M NOT AN ILLUSTRATOR

Slide 53

Slide 53 text

kenney.nl

Slide 54

Slide 54 text

No content

Slide 55

Slide 55 text

TILESETS

Slide 56

Slide 56 text

No content

Slide 57

Slide 57 text

No content

Slide 58

Slide 58 text

CHOOSE A TECH

Slide 59

Slide 59 text

> HTML

Slide 60

Slide 60 text

> HTML > SVG

Slide 61

Slide 61 text

> HTML > SVG > WebGL

Slide 62

Slide 62 text

> HTML > SVG > WebGL > Canvas

Slide 63

Slide 63 text

> HTML > SVG > WebGL > Canvas

Slide 64

Slide 64 text

view : Model -> Html Msg

Slide 65

Slide 65 text

MODEL { pirate = (10, 50) }

Slide 66

Slide 66 text

QUADRANTS

Slide 67

Slide 67 text

No content

Slide 68

Slide 68 text

No content

Slide 69

Slide 69 text

(10, -50) ?

Slide 70

Slide 70 text

PANNING

Slide 71

Slide 71 text

No content

Slide 72

Slide 72 text

ZOOMING

Slide 73

Slide 73 text

No content

Slide 74

Slide 74 text

No content

Slide 75

Slide 75 text

VIEW POSITIONS AND SIZES ARE RELATIVE

Slide 76

Slide 76 text

THE COMPILER CAN HELP US BUT WE NEED TO COMMUNICATE

Slide 77

Slide 77 text

TYPE SAFETY AROUND DISTANCES module Measurement exposing (Feet, Pixels, PixelsPerFoot) type Feet = Feet Int type Pixels = Pixels Int type PixelsPerFoot = PixelsPerFoot Int

Slide 78

Slide 78 text

TYPE SAFETY AROUND COORDINATES module Coordinate exposing (World, Screen) type World = World Point type Screen = Screen Point

Slide 79

Slide 79 text

No content

Slide 80

Slide 80 text

VIEWPORTS

Slide 81

Slide 81 text

No content

Slide 82

Slide 82 text

module Cordinate exposing (World, Screen, Viewport) -- OTHER CODE type alias Viewport = { position : World , width : Pixels , height : Pixels , zoom : PixelsPerFoot }

Slide 83

Slide 83 text

toScreen : Viewport -> World -> Screen

Slide 84

Slide 84 text

MODEL { pirate = World (10, 50) , viewport = ... }

Slide 85

Slide 85 text

DECOUPLE YOUR GAME STATE FROM HOW IT WILL BE RENDERED

Slide 86

Slide 86 text

DECOUPLE YOUR GAME SPEED FROM THE PAINT RATE

Slide 87

Slide 87 text

30FPS -> 60 FPS

Slide 88

Slide 88 text

DISCRETE VS CONTINUOUS

Slide 89

Slide 89 text

ANIMATION FRAME IS NOT CONSISTENT

Slide 90

Slide 90 text

SUBSCRIBE TO DELTAS subscriptions : Model -> Sub Msg subscriptions model = Browser.Events.onAnimationFrameDelta Tick

Slide 91

Slide 91 text

SCALE BY THE DELTA

Slide 92

Slide 92 text

I'M STUCK!

Slide 93

Slide 93 text

COMMON SOLUTIONS > Google > #gamedev on Slack > Your gamejam community

Slide 94

Slide 94 text

When you’re stuck on a programming problem, the best way to get unstuck is often to try to express the problem in a different medium.

Slide 95

Slide 95 text

VERBAL

Slide 96

Slide 96 text

VISUAL

Slide 97

Slide 97 text

EXAMPLE - TILE MAPS

Slide 98

Slide 98 text

STORING ONE LONG LIST AND A WIDTH

Slide 99

Slide 99 text

No content

Slide 100

Slide 100 text

WHAT IS THE POSITION OF TILE 5?

Slide 101

Slide 101 text

DIVISION AND REMAINDER

Slide 102

Slide 102 text

No content

Slide 103

Slide 103 text

No content

Slide 104

Slide 104 text

EXPLORATORY DRAWING

Slide 105

Slide 105 text

No content

Slide 106

Slide 106 text

BRUTE FORCING

Slide 107

Slide 107 text

case region map (TileNumber tileNumber) of NorthWestCorner -> ... NorthEastCorner -> ... SouthWestCorner -> ... SouthEastCorner -> ... NorthEdge -> ... WestEdge -> ... EastEdge -> ... SouthEdge -> ... Middle -> ...

Slide 108

Slide 108 text

No content

Slide 109

Slide 109 text

JOIN A GAMEJAM!

Slide 110

Slide 110 text

> JoelQ/safe-tea > JoelQ/down-the-river > joshuaclayton/ship-it > JoelQ/muses

Slide 111

Slide 111 text

JOËL QUENNEVILLE Web developer at thoughtbot > GitHub - JoelQ > Twitter - @joelquen > Slack - @joelq