DOWN THE RIVER
type Msg
= Tick Float
| Move Game.YDirection
| NewSection Section
| StartGame
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GRAPHICS
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EASY TO WASTE TIME
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PLACEHOLDERS
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I'M NOT AN ILLUSTRATOR
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kenney.nl
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TILESETS
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CHOOSE A TECH
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> HTML
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> HTML
> SVG
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> HTML
> SVG
> WebGL
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> HTML
> SVG
> WebGL
> Canvas
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> HTML
> SVG
> WebGL
> Canvas
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view : Model -> Html Msg
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MODEL
{ pirate = (10, 50)
}
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QUADRANTS
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(10, -50) ?
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PANNING
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ZOOMING
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VIEW POSITIONS AND
SIZES ARE RELATIVE
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THE COMPILER CAN HELP
US BUT WE NEED TO
COMMUNICATE
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TYPE SAFETY AROUND DISTANCES
module Measurement exposing (Feet, Pixels, PixelsPerFoot)
type Feet
= Feet Int
type Pixels
= Pixels Int
type PixelsPerFoot
= PixelsPerFoot Int
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TYPE SAFETY AROUND COORDINATES
module Coordinate exposing (World, Screen)
type World
= World Point
type Screen
= Screen Point
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VIEWPORTS
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module Cordinate exposing (World, Screen, Viewport)
-- OTHER CODE
type alias Viewport =
{ position : World
, width : Pixels
, height : Pixels
, zoom : PixelsPerFoot
}
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toScreen : Viewport ->
World -> Screen
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MODEL
{ pirate = World (10, 50)
, viewport = ...
}
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DECOUPLE YOUR GAME
STATE FROM HOW IT WILL
BE RENDERED
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DECOUPLE YOUR GAME
SPEED FROM THE PAINT
RATE
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30FPS -> 60 FPS
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DISCRETE VS
CONTINUOUS
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ANIMATION FRAME IS NOT
CONSISTENT
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SUBSCRIBE TO DELTAS
subscriptions : Model -> Sub Msg
subscriptions model =
Browser.Events.onAnimationFrameDelta Tick
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SCALE BY THE DELTA
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I'M STUCK!
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COMMON SOLUTIONS
> Google
> #gamedev on Slack
> Your gamejam community
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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.