From 5d30cbe44135e4e1983aac262487a8e58b4c5879 Mon Sep 17 00:00:00 2001
From: Trevor Slocum <trevor@rocketnine.space>
Date: Fri, 17 Jun 2022 14:17:03 -0700
Subject: [PATCH] Initial commit

---
 LICENSE                               | 661 ++++++++++++++++++++++++++
 README.md                             |  35 ++
 asset/asset.go                        | 118 +++++
 asset/image/robot-tileset/README      |   3 +
 asset/image/robot-tileset/tileset.png | Bin 0 -> 7515 bytes
 asset/image/robot-tileset/tileset.tsx |  18 +
 asset/map/map.tmx                     | 116 +++++
 component/player.go                   |   3 +
 component/position.go                 |   5 +
 component/sprite.go                   |  32 ++
 component/velocity.go                 |   5 +
 doctorlectro.tiled-project            |  11 +
 entity/player.go                      |  28 ++
 flags.go                              |  31 ++
 flags_web.go                          |  15 +
 game/game.go                          |  59 +++
 go.mod                                |  20 +
 go.sum                                |  97 ++++
 goreleaser.yml                        |  29 ++
 level/level.go                        | 156 ++++++
 main.go                               |  45 ++
 system/input_move.go                  | 105 ++++
 system/movement.go                    | 235 +++++++++
 system/render.go                      | 126 +++++
 system/renderdebug.go                 |  49 ++
 world/world.go                        |  78 +++
 26 files changed, 2080 insertions(+)
 create mode 100644 LICENSE
 create mode 100644 README.md
 create mode 100644 asset/asset.go
 create mode 100644 asset/image/robot-tileset/README
 create mode 100644 asset/image/robot-tileset/tileset.png
 create mode 100644 asset/image/robot-tileset/tileset.tsx
 create mode 100644 asset/map/map.tmx
 create mode 100644 component/player.go
 create mode 100644 component/position.go
 create mode 100644 component/sprite.go
 create mode 100644 component/velocity.go
 create mode 100644 doctorlectro.tiled-project
 create mode 100644 entity/player.go
 create mode 100644 flags.go
 create mode 100644 flags_web.go
 create mode 100644 game/game.go
 create mode 100644 go.mod
 create mode 100644 go.sum
 create mode 100644 goreleaser.yml
 create mode 100644 level/level.go
 create mode 100644 main.go
 create mode 100644 system/input_move.go
 create mode 100644 system/movement.go
 create mode 100644 system/render.go
 create mode 100644 system/renderdebug.go
 create mode 100644 world/world.go

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..be3f7b2
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+means of facilitating copying of software.  This Corresponding Source
+shall include the Corresponding Source for any work covered by version 3
+of the GNU General Public License that is incorporated pursuant to the
+following paragraph.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..caffa80
--- /dev/null
+++ b/README.md
@@ -0,0 +1,35 @@
+# Doctor Lectro
+[![Donate via LiberaPay](https://img.shields.io/liberapay/receives/rocketnine.space.svg?logo=liberapay)](https://liberapay.com/rocketnine.space)
+[![Donate via Patreon](https://img.shields.io/badge/dynamic/json?color=%23e85b46&label=Patreon&query=data.attributes.patron_count&suffix=%20patrons&url=https%3A%2F%2Fwww.patreon.com%2Fapi%2Fcampaigns%2F5252223)](https://www.patreon.com/rocketnine)
+
+[Metroidvania](https://en.wikipedia.org/wiki/Metroidvania) video game
+
+This game was created for the [Ebitengine Game Jam](https://itch.io/jam/ebiten-game-jam).
+
+## Play
+
+### Browser
+
+[**Play in your browser**](https://rocketnine.itch.io/doctorlectro)
+
+### Compile
+
+Install the dependencies listed for [your platform](https://github.com/hajimehoshi/ebiten/blob/main/README.md#platforms),
+then run the following command:
+
+`go install code.rocketnine.space/tslocum/doctorlectro@latest`
+
+Run `~/go/bin/doctorlectro` to play.
+
+## Support
+
+Please share issues and suggestions [here](https://code.rocketnine.space/tslocum/doctorlectro/issues).
+
+## Credits
+
+- [Trevor Slocum](https://rocketnine.space) - Game design and programming
+
+## Dependencies
+
+- [ebiten](https://github.com/hajimehoshi/ebiten) - Game engine
+- [gohan](https://code.rocketnine.space/tslocum/gohan) - Entity Component System framework
diff --git a/asset/asset.go b/asset/asset.go
new file mode 100644
index 0000000..ef42b95
--- /dev/null
+++ b/asset/asset.go
@@ -0,0 +1,118 @@
+package asset
+
+import (
+	"embed"
+	"image"
+	"image/color"
+	"math"
+
+	"github.com/hajimehoshi/ebiten/v2"
+
+	_ "image/png"
+)
+
+//go:embed image map
+var FS embed.FS
+
+var ImgWhiteSquare = newFilledImage(4, 4, color.White)
+
+var ImgRobotTileset = LoadImage("image/robot-tileset/tileset.png")
+
+const (
+	idleX, idleY = 208, 118
+	idleW, idleH = 16, 27
+)
+
+var ImgPlayerIdle1 = ImgRobotTileset.SubImage(image.Rect(idleX, idleY, idleX+idleW, idleY+idleH)).(*ebiten.Image)
+var ImgPlayerIdle2 = ImgRobotTileset.SubImage(image.Rect(idleX+idleW, idleY, idleX+idleW+idleW, idleY+idleH)).(*ebiten.Image)
+var ImgPlayerIdle3 = ImgRobotTileset.SubImage(image.Rect(idleX+idleW*2, idleY, idleX+idleW*2+idleW, idleY+idleH)).(*ebiten.Image)
+var ImgPlayerIdle4 = ImgRobotTileset.SubImage(image.Rect(idleX+idleW*3, idleY, idleX+idleW*3+idleW, idleY+idleH)).(*ebiten.Image)
+
+var PlayerIdleFrames = []*ebiten.Image{
+	ImgPlayerIdle3,
+	ImgPlayerIdle4,
+	ImgPlayerIdle1,
+	ImgPlayerIdle2,
+}
+
+var ImgPlayerIdle1Rot90 = rotate90(ImgPlayerIdle1)
+var ImgPlayerIdle2Rot90 = rotate90(ImgPlayerIdle2)
+var ImgPlayerIdle3Rot90 = rotate90(ImgPlayerIdle3)
+var ImgPlayerIdle4Rot90 = rotate90(ImgPlayerIdle4)
+
+var PlayerIdleFramesRot90 = []*ebiten.Image{
+	ImgPlayerIdle1Rot90,
+	ImgPlayerIdle2Rot90,
+	ImgPlayerIdle3Rot90,
+	ImgPlayerIdle4Rot90,
+}
+
+const (
+	walkX, walkY = 288, 118
+	walkW, walkH = 16, 26
+)
+
+var ImgPlayerWalk1 = ImgRobotTileset.SubImage(image.Rect(walkX, walkY, walkX+walkW, walkY+walkH)).(*ebiten.Image)
+var ImgPlayerWalk2 = ImgRobotTileset.SubImage(image.Rect(walkX+walkW, walkY, walkX+walkW+walkW, walkY+walkH)).(*ebiten.Image)
+var ImgPlayerWalk3 = ImgRobotTileset.SubImage(image.Rect(walkX+walkW*2, walkY, walkX+walkW*2+walkW, walkY+walkH)).(*ebiten.Image)
+var ImgPlayerWalk4 = ImgRobotTileset.SubImage(image.Rect(walkX+walkW*3, walkY, walkX+walkW*3+walkW, walkY+walkH)).(*ebiten.Image)
+
+var PlayerWalkFrames = []*ebiten.Image{
+	ImgPlayerWalk1,
+	ImgPlayerWalk2,
+	ImgPlayerWalk3,
+	ImgPlayerWalk4,
+}
+
+var ImgPlayerWalk1Rot90 = rotate90(ImgPlayerWalk1)
+var ImgPlayerWalk2Rot90 = rotate90(ImgPlayerWalk2)
+var ImgPlayerWalk3Rot90 = rotate90(ImgPlayerWalk3)
+var ImgPlayerWalk4Rot90 = rotate90(ImgPlayerWalk4)
+
+var PlayerWalkFramesRot90 = []*ebiten.Image{
+	ImgPlayerWalk1Rot90,
+	ImgPlayerWalk2Rot90,
+	ImgPlayerWalk3Rot90,
+	ImgPlayerWalk4Rot90,
+}
+
+func rotate90(src *ebiten.Image) *ebiten.Image {
+	bounds := src.Bounds()
+	width, height := bounds.Dx(), bounds.Dy()
+	img := ebiten.NewImage(height*2, width)
+	op := &ebiten.DrawImageOptions{}
+	op.GeoM.Translate(0, -float64(height)/2)
+	op.GeoM.Rotate(math.Pi / 2)
+	op.GeoM.Translate(float64(width)-4, 0)
+	img.DrawImage(src, op)
+	return img
+}
+
+func newFilledImage(w int, h int, c color.Color) *ebiten.Image {
+	img := ebiten.NewImage(w, h)
+	img.Fill(c)
+	return img
+}
+
+func LoadImage(p string) *ebiten.Image {
+	f, err := FS.Open(p)
+	if err != nil {
+		panic(err)
+	}
+	defer f.Close()
+
+	baseImg, _, err := image.Decode(f)
+	if err != nil {
+		panic(err)
+	}
+
+	return ebiten.NewImageFromImage(baseImg)
+}
+
+func LoadBytes(p string) []byte {
+	b, err := FS.ReadFile(p)
+	if err != nil {
+		panic(err)
+	}
+	return b
+}
diff --git a/asset/image/robot-tileset/README b/asset/image/robot-tileset/README
new file mode 100644
index 0000000..41287a3
--- /dev/null
+++ b/asset/image/robot-tileset/README
@@ -0,0 +1,3 @@
+This tileset was created by 0x72 and is in the public domain.
+
+https://0x72.itch.io/16x16-robot-tileset
diff --git a/asset/image/robot-tileset/tileset.png b/asset/image/robot-tileset/tileset.png
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diff --git a/asset/image/robot-tileset/tileset.tsx b/asset/image/robot-tileset/tileset.tsx
new file mode 100644
index 0000000..36a139d
--- /dev/null
+++ b/asset/image/robot-tileset/tileset.tsx
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<tileset version="1.5" tiledversion="1.7.2" name="Robot" tilewidth="16" tileheight="16" tilecount="1024" columns="32">
+ <image source="tileset.png" width="512" height="512"/>
+ <wangsets>
+  <wangset name="Unnamed Set" type="corner" tile="-1">
+   <wangcolor name="" color="#ff0000" tile="-1" probability="1"/>
+   <wangtile tileid="32" wangid="0,0,0,1,0,0,0,0"/>
+   <wangtile tileid="33" wangid="0,0,0,1,0,1,0,0"/>
+   <wangtile tileid="34" wangid="0,0,0,0,0,1,0,0"/>
+   <wangtile tileid="64" wangid="0,1,0,1,0,0,0,0"/>
+   <wangtile tileid="65" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="66" wangid="0,0,0,0,0,1,0,1"/>
+   <wangtile tileid="96" wangid="0,1,0,0,0,0,0,0"/>
+   <wangtile tileid="97" wangid="0,1,0,0,0,0,0,1"/>
+   <wangtile tileid="98" wangid="0,0,0,0,0,0,0,1"/>
+  </wangset>
+ </wangsets>
+</tileset>
diff --git a/asset/map/map.tmx b/asset/map/map.tmx
new file mode 100644
index 0000000..4627060
--- /dev/null
+++ b/asset/map/map.tmx
@@ -0,0 +1,116 @@
+<?xml version="1.0" encoding="UTF-8"?>
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+ <tileset firstgid="1" source="../image/robot-tileset/tileset.tsx"/>
+ <layer id="1" name="Tile Layer 1" width="100" height="100">
+  <data encoding="csv">
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+</data>
+ </layer>
+ <objectgroup id="4" name="TRIGGERS">
+  <object id="5" name="PLAYERSPAWN" x="480" y="112" rotation="90"/>
+ </objectgroup>
+ <objectgroup color="#0000ff" id="2" name="Guides" visible="0">
+  <object id="2" x="16" y="16" width="944" height="528"/>
+  <object id="3" x="16" y="544" width="944" height="528"/>
+ </objectgroup>
+ <objectgroup id="3" name="PLAYERSPAWN"/>
+</map>
diff --git a/component/player.go b/component/player.go
new file mode 100644
index 0000000..5a5d7b4
--- /dev/null
+++ b/component/player.go
@@ -0,0 +1,3 @@
+package component
+
+type Player struct{}
diff --git a/component/position.go b/component/position.go
new file mode 100644
index 0000000..fc45278
--- /dev/null
+++ b/component/position.go
@@ -0,0 +1,5 @@
+package component
+
+type Position struct {
+	X, Y float64
+}
diff --git a/component/sprite.go b/component/sprite.go
new file mode 100644
index 0000000..cbf5f25
--- /dev/null
+++ b/component/sprite.go
@@ -0,0 +1,32 @@
+package component
+
+import (
+	"time"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type Sprite struct {
+	Image          *ebiten.Image
+	HorizontalFlip bool
+	VerticalFlip   bool
+	DiagonalFlip   bool // TODO unimplemented
+
+	Angle float64
+
+	Overlay            *ebiten.Image
+	OverlayX, OverlayY float64 // Overlay offset
+
+	OffsetX, OffsetY float64
+
+	Frame     int
+	Frames    []*ebiten.Image
+	FrameTime time.Duration
+	LastFrame time.Time
+	NumFrames int
+
+	DamageTicks int
+
+	OverrideColorScale bool
+	ColorScale         float64
+}
diff --git a/component/velocity.go b/component/velocity.go
new file mode 100644
index 0000000..61c63a8
--- /dev/null
+++ b/component/velocity.go
@@ -0,0 +1,5 @@
+package component
+
+type Velocity struct {
+	X, Y float64
+}
diff --git a/doctorlectro.tiled-project b/doctorlectro.tiled-project
new file mode 100644
index 0000000..72b2b2e
--- /dev/null
+++ b/doctorlectro.tiled-project
@@ -0,0 +1,11 @@
+{
+    "automappingRulesFile": "",
+    "commands": [
+    ],
+    "extensionsPath": "extensions",
+    "folders": [
+        "asset/image/robot-tileset",
+        "asset/map"
+    ],
+    "objectTypesFile": ""
+}
diff --git a/entity/player.go b/entity/player.go
new file mode 100644
index 0000000..4cb2d5d
--- /dev/null
+++ b/entity/player.go
@@ -0,0 +1,28 @@
+package entity
+
+import (
+	"time"
+
+	"code.rocketnine.space/tslocum/doctorlectro/asset"
+
+	"code.rocketnine.space/tslocum/doctorlectro/component"
+	"code.rocketnine.space/tslocum/gohan"
+)
+
+func NewPlayer() gohan.Entity {
+	player := gohan.NewEntity()
+
+	player.AddComponent(&component.Position{})
+
+	player.AddComponent(&component.Velocity{})
+
+	player.AddComponent(&component.Sprite{
+		Frames:    asset.PlayerIdleFrames,
+		FrameTime: 200 * time.Millisecond,
+		NumFrames: len(asset.PlayerIdleFrames),
+	})
+
+	player.AddComponent(&component.Player{})
+
+	return player
+}
diff --git a/flags.go b/flags.go
new file mode 100644
index 0000000..6bbe90b
--- /dev/null
+++ b/flags.go
@@ -0,0 +1,31 @@
+//go:build !js || !wasm
+// +build !js !wasm
+
+package main
+
+import (
+	"flag"
+
+	"code.rocketnine.space/tslocum/doctorlectro/world"
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+func parseFlags() {
+	var (
+		fullscreen bool
+		skipIntro  bool
+	)
+	flag.BoolVar(&fullscreen, "fullscreen", false, "run in fullscreen mode")
+	flag.BoolVar(&skipIntro, "skip", false, "skip intro screens")
+	flag.BoolVar(&world.GodMode, "god", false, "enable god mode")
+	flag.IntVar(&world.Debug, "debug", 0, "print debug information")
+	flag.Parse()
+
+	if fullscreen {
+		ebiten.SetFullscreen(true)
+	}
+
+	if skipIntro {
+		world.StartGame()
+	}
+}
diff --git a/flags_web.go b/flags_web.go
new file mode 100644
index 0000000..4801ee5
--- /dev/null
+++ b/flags_web.go
@@ -0,0 +1,15 @@
+//go:build js && wasm
+// +build js,wasm
+
+package main
+
+import (
+	"code.rocketnine.space/tslocum/doctorlectro/world"
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+func parseFlags() {
+	world.DisableEsc = true
+
+	ebiten.SetFullscreen(true)
+}
diff --git a/game/game.go b/game/game.go
new file mode 100644
index 0000000..6ad730d
--- /dev/null
+++ b/game/game.go
@@ -0,0 +1,59 @@
+package game
+
+import (
+	"os"
+
+	"code.rocketnine.space/tslocum/doctorlectro/level"
+
+	"code.rocketnine.space/tslocum/doctorlectro/entity"
+	"code.rocketnine.space/tslocum/doctorlectro/system"
+	"code.rocketnine.space/tslocum/doctorlectro/world"
+	"code.rocketnine.space/tslocum/gohan"
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type Game struct {
+}
+
+func NewGame() (*Game, error) {
+	g := &Game{}
+
+	world.Player = entity.NewPlayer()
+
+	level.LoadMap()
+
+	g.addSystems()
+
+	return g, nil
+}
+
+func (g *Game) addSystems() {
+	gohan.AddSystem(system.NewMovementSystem())
+	gohan.AddSystem(system.NewPlayerMoveSystem())
+	gohan.AddSystem(system.NewRenderSystem())
+	gohan.AddSystem(system.NewRenderDebugTextSystem())
+}
+
+func (g *Game) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
+	return world.ScreenWidth, world.ScreenHeight
+}
+
+func (g *Game) Update() error {
+	if ebiten.IsWindowBeingClosed() {
+		g.Exit()
+		return nil
+	}
+
+	return gohan.Update()
+}
+
+func (g *Game) Draw(screen *ebiten.Image) {
+	err := gohan.Draw(screen)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func (g *Game) Exit() {
+	os.Exit(0)
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..206a74b
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,20 @@
+module code.rocketnine.space/tslocum/doctorlectro
+
+go 1.18
+
+require (
+	code.rocketnine.space/tslocum/gohan v1.0.0
+	github.com/hajimehoshi/ebiten/v2 v2.3.4
+)
+
+require (
+	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20220516021902-eb3e265c7661 // indirect
+	github.com/gofrs/flock v0.8.1 // indirect
+	github.com/jezek/xgb v1.0.1 // indirect
+	github.com/lafriks/go-tiled v0.7.0 // indirect
+	golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56 // indirect
+	golang.org/x/image v0.0.0-20220601225756-64ec528b34cd // indirect
+	golang.org/x/mobile v0.0.0-20220518205345-8578da9835fd // indirect
+	golang.org/x/sync v0.0.0-20220601150217-0de741cfad7f // indirect
+	golang.org/x/sys v0.0.0-20220610221304-9f5ed59c137d // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..ed39a23
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,97 @@
+code.rocketnine.space/tslocum/gohan v1.0.0 h1:WBcJq7nVfmr1EB8bew6xWlB5Q1714yWJ3a9/q6aBBrY=
+code.rocketnine.space/tslocum/gohan v1.0.0/go.mod h1:12yOt5Ygl/RVwnnZSVZRuS1W6gCaHJgezcvg8+THk10=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/disintegration/imaging v1.6.2/go.mod h1:44/5580QXChDfwIclfc/PCwrr44amcmDAg8hxG0Ewe4=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20220320163800-277f93cfa958/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20220516021902-eb3e265c7661 h1:1bpooddSK2996NWM/1TW59cchQOm9MkoV9DkhSJH1BI=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20220516021902-eb3e265c7661/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
+github.com/gofrs/flock v0.8.1 h1:+gYjHKf32LDeiEEFhQaotPbLuUXjY5ZqxKgXy7n59aw=
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diff --git a/goreleaser.yml b/goreleaser.yml
new file mode 100644
index 0000000..e46fbe7
--- /dev/null
+++ b/goreleaser.yml
@@ -0,0 +1,29 @@
+project_name: doctorlectro
+
+builds:
+  -
+    id: doctorlectro
+    goos:
+      - js
+      - linux
+      - windows
+    goarch:
+      - amd64
+      - wasm
+archives:
+  -
+    id: doctorlectro
+    builds:
+      - doctorlectro
+    replacements:
+      386: i386
+    format_overrides:
+      - goos: js
+        format: zip
+      - goos: windows
+        format: zip
+    files:
+      - ./*.md
+      - LICENSE
+checksum:
+  name_template: 'checksums.txt'
diff --git a/level/level.go b/level/level.go
new file mode 100644
index 0000000..7108103
--- /dev/null
+++ b/level/level.go
@@ -0,0 +1,156 @@
+package level
+
+import (
+	"image"
+	"log"
+	"path/filepath"
+
+	"code.rocketnine.space/tslocum/doctorlectro/asset"
+	"code.rocketnine.space/tslocum/doctorlectro/component"
+	"code.rocketnine.space/tslocum/doctorlectro/world"
+	"code.rocketnine.space/tslocum/gohan"
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/lafriks/go-tiled"
+)
+
+// TODO load player spawn coordinates from map
+
+func LoadMap() {
+	filePath := "map/map.tmx"
+
+	// Parse .tmx file.
+	m, err := tiled.LoadFile(filePath, tiled.WithFileSystem(asset.FS))
+	if err != nil {
+		log.Fatalf("error parsing world: %+v", err)
+	}
+
+	// Load tileset.
+
+	tileset := m.Tilesets[0]
+
+	imgPath := filepath.Join("image/robot-tileset", tileset.Image.Source)
+	f, err := asset.FS.Open(filepath.FromSlash(imgPath))
+	if err != nil {
+		panic(err)
+	}
+	defer f.Close()
+
+	img, _, err := image.Decode(f)
+	if err != nil {
+		panic(err)
+	}
+	tilesetImg := ebiten.NewImageFromImage(img)
+
+	// Load tiles.
+
+	for i := uint32(0); i < uint32(tileset.TileCount); i++ {
+		rect := tileset.GetTileRect(i)
+		world.TileImages[i+tileset.FirstGID] = tilesetImg.SubImage(rect).(*ebiten.Image)
+	}
+
+	createTileEntity := func(t *tiled.LayerTile, x int, y int) gohan.Entity {
+		tileX, tileY := TileToGameCoords(x, y)
+
+		mapTile := gohan.NewEntity()
+		mapTile.AddComponent(&component.Position{
+			X: tileX,
+			Y: tileY,
+		})
+
+		sprite := &component.Sprite{
+			Image:          world.TileImages[t.Tileset.FirstGID+t.ID],
+			HorizontalFlip: t.HorizontalFlip,
+			VerticalFlip:   t.VerticalFlip,
+			DiagonalFlip:   t.DiagonalFlip,
+		}
+		mapTile.AddComponent(sprite)
+
+		return mapTile
+	}
+
+	metalTiles := make([][]bool, m.Height)
+	for y := range metalTiles {
+		metalTiles[y] = make([]bool, m.Width)
+	}
+
+	var t *tiled.LayerTile
+	for _, layer := range m.Layers {
+		for y := 0; y < m.Height; y++ {
+			for x := 0; x < m.Width; x++ {
+				t = layer.Tiles[y*m.Width+x]
+				if t == nil || t.Nil {
+					continue // No tile at this position.
+				}
+
+				tileImg := world.TileImages[t.Tileset.FirstGID+t.ID]
+				if tileImg == nil {
+					continue
+				}
+				createTileEntity(t, x, y)
+
+				//TODO if metal tile
+				metalTiles[y][x] = true
+			}
+		}
+	}
+
+	// Load ObjectGroups.
+
+	var objects []*tiled.ObjectGroup
+	var loadObjects func(grp *tiled.Group)
+	loadObjects = func(grp *tiled.Group) {
+		for _, subGrp := range grp.Groups {
+			loadObjects(subGrp)
+		}
+		for _, objGrp := range grp.ObjectGroups {
+			objects = append(objects, objGrp)
+		}
+	}
+	for _, grp := range m.Groups {
+		loadObjects(grp)
+	}
+	for _, objGrp := range m.ObjectGroups {
+		objects = append(objects, objGrp)
+	}
+
+	world.Map = m
+	world.ObjectGroups = objects
+
+	for _, grp := range world.ObjectGroups {
+		if grp.Name == "TRIGGERS" {
+			for _, obj := range grp.Objects {
+				if obj.Name == "PLAYERSPAWN" {
+					world.SpawnX, world.SpawnY = obj.X, obj.Y
+				}
+			}
+		} else if grp.Name == "HAZARDS" {
+			/*for _, obj := range grp.Objects {
+				r := ObjectToRect(obj)
+				r.Min.Y += 32
+				r.Max.Y += 32
+				World.HazardRects = append(World.HazardRects, r)
+			}*/
+		}
+	}
+
+	// Add metal collision rects.
+	for y := range metalTiles {
+		for x, filled := range metalTiles[y] {
+			if filled {
+				r := image.Rect(x*world.TileSize, y*world.TileSize, (x+1)*world.TileSize-1, (y+1)*world.TileSize-1)
+				world.MetalRects = append(world.MetalRects, r)
+			}
+		}
+	}
+}
+
+func ObjectToRect(o *tiled.Object) image.Rectangle {
+	x, y, w, h := int(o.X), int(o.Y), int(o.Width), int(o.Height)
+	y -= 16
+	return image.Rect(x, y, x+w, y+h)
+}
+
+func TileToGameCoords(x, y int) (float64, float64) {
+	//return float64(x) * 32, float64(g.currentMap.Height*32) - float64(y)*32 - 32
+	return float64(x) * 16, float64(y) * 16
+}
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..d6e1c76
--- /dev/null
+++ b/main.go
@@ -0,0 +1,45 @@
+package main
+
+import (
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"code.rocketnine.space/tslocum/doctorlectro/game"
+	"code.rocketnine.space/tslocum/doctorlectro/world"
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+func main() {
+	ebiten.SetWindowTitle("Doctor Lectro")
+	ebiten.SetWindowResizable(true)
+	ebiten.SetWindowSize(world.ScreenWidth, world.ScreenHeight)
+	ebiten.SetMaxTPS(144)
+	ebiten.SetRunnableOnUnfocused(true) // Note - this currently does nothing in ebiten
+	ebiten.SetWindowClosingHandled(true)
+	ebiten.SetFPSMode(ebiten.FPSModeVsyncOn)
+	ebiten.SetCursorMode(ebiten.CursorModeHidden)
+
+	g, err := game.NewGame()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	parseFlags()
+
+	sigc := make(chan os.Signal, 1)
+	signal.Notify(sigc,
+		syscall.SIGINT,
+		syscall.SIGTERM)
+	go func() {
+		<-sigc
+
+		g.Exit()
+	}()
+
+	err = ebiten.RunGame(g)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/system/input_move.go b/system/input_move.go
new file mode 100644
index 0000000..d3fcf6e
--- /dev/null
+++ b/system/input_move.go
@@ -0,0 +1,105 @@
+package system
+
+import (
+	"os"
+
+	"code.rocketnine.space/tslocum/doctorlectro/component"
+	"code.rocketnine.space/tslocum/doctorlectro/world"
+	"code.rocketnine.space/tslocum/gohan"
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+)
+
+const (
+	moveSpeed    = 0.02
+	maxMoveSpeed = 1.0
+)
+
+type playerMoveSystem struct {
+	Position *component.Position
+	Velocity *component.Velocity
+	Sprite   *component.Sprite
+	Player   *component.Player
+}
+
+func NewPlayerMoveSystem() *playerMoveSystem {
+	return &playerMoveSystem{}
+}
+
+func (s *playerMoveSystem) Update(e gohan.Entity) error {
+	if ebiten.IsKeyPressed(ebiten.KeyEscape) && !world.DisableEsc {
+		os.Exit(0)
+		return nil
+	}
+
+	if ebiten.IsKeyPressed(ebiten.KeyControl) && inpututil.IsKeyJustPressed(ebiten.KeyV) {
+		v := 1
+		if ebiten.IsKeyPressed(ebiten.KeyShift) {
+			v = 2
+		}
+		if world.Debug == v {
+			world.Debug = 0
+		} else {
+			world.Debug = v
+		}
+		return nil
+	}
+
+	if !world.GameStarted {
+		if ebiten.IsKeyPressed(ebiten.KeyEnter) || ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
+			world.StartGame()
+		}
+		return nil
+	}
+
+	/*if inpututil.IsKeyJustPressed(ebiten.KeyM) {
+		if asset.SoundLevelMusic.IsPlaying() {
+			asset.SoundLevelMusic.Pause()
+		} else {
+			asset.SoundLevelMusic.Play()
+		}
+	}*/
+
+	if world.GameOver {
+		if inpututil.IsKeyJustPressed(ebiten.KeyEnter) {
+			world.ResetGame = true
+		}
+		return nil
+	}
+
+	pressLeft := ebiten.IsKeyPressed(ebiten.KeyLeft) || ebiten.IsKeyPressed(ebiten.KeyA)
+	pressRight := ebiten.IsKeyPressed(ebiten.KeyRight) || ebiten.IsKeyPressed(ebiten.KeyD)
+	pressUp := ebiten.IsKeyPressed(ebiten.KeyUp) || ebiten.IsKeyPressed(ebiten.KeyW)
+	pressDown := ebiten.IsKeyPressed(ebiten.KeyDown) || ebiten.IsKeyPressed(ebiten.KeyS)
+
+	if (pressLeft && !pressRight) ||
+		(pressRight && !pressLeft) {
+		if pressLeft {
+			if s.Velocity.X > -maxMoveSpeed {
+				s.Velocity.X += -moveSpeed
+			}
+			world.LastWalkDirL = true
+		} else if pressRight {
+			if s.Velocity.X < maxMoveSpeed {
+				s.Velocity.X += moveSpeed
+			}
+			world.LastWalkDirL = false
+		}
+	}
+
+	if (pressUp && !pressDown) ||
+		(pressDown && !pressUp) {
+		if pressUp && world.Clinging {
+			s.Velocity.Y += -moveSpeed
+			world.LastWalkDirU = true
+		} else if pressDown && world.Clinging {
+			s.Velocity.Y += moveSpeed
+			world.LastWalkDirU = false
+		}
+	}
+	return nil
+}
+
+func (s *playerMoveSystem) Draw(_ gohan.Entity, _ *ebiten.Image) error {
+	return gohan.ErrUnregister
+}
diff --git a/system/movement.go b/system/movement.go
new file mode 100644
index 0000000..e2383a2
--- /dev/null
+++ b/system/movement.go
@@ -0,0 +1,235 @@
+package system
+
+import (
+	"image"
+	"log"
+
+	"code.rocketnine.space/tslocum/doctorlectro/asset"
+
+	"code.rocketnine.space/tslocum/doctorlectro/component"
+	"code.rocketnine.space/tslocum/doctorlectro/world"
+	"code.rocketnine.space/tslocum/gohan"
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type MovementSystem struct {
+	Position *component.Position
+	Velocity *component.Velocity
+
+	Sprite *component.Sprite `gohan:"?"`
+}
+
+func NewMovementSystem() *MovementSystem {
+	return &MovementSystem{}
+}
+
+func (s *MovementSystem) Update(e gohan.Entity) error {
+	if !world.GameStarted {
+		return nil
+	}
+
+	if world.GameOver && e == world.Player {
+		return nil
+	}
+
+	s.handleLevelCollisions(e)
+	s.handleScreenCollisions(e)
+	return nil
+}
+
+func (s *MovementSystem) levelCoordinatesToScreen(x, y float64) (float64, float64) {
+	return x - world.CamX, y - world.CamY
+}
+
+func (_ *MovementSystem) Draw(_ gohan.Entity, _ *ebiten.Image) error {
+	return gohan.ErrUnregister
+}
+
+// handleLevelCollisions handles collisions between the player and the level.
+func (s *MovementSystem) handleLevelCollisions(e gohan.Entity) {
+	position := s.Position
+	velocity := s.Velocity
+
+	vx, vy := velocity.X, velocity.Y
+	if e == world.Player && world.Debug != 0 && ebiten.IsKeyPressed(ebiten.KeyShift) {
+		vx, vy = vx*2, vy*2
+	}
+
+	const gravityCollisionCheck = 0.1
+
+	newX, newY := position.X+vx, position.Y+vy
+	playerRectX := image.Rect(int(newX), int(position.Y), int(newX+world.PlayerWidth), int(position.Y+world.PlayerHeight))
+	playerRectY := image.Rect(int(position.X), int(newY), int(position.X+world.PlayerWidth), int(newY+world.PlayerHeight))
+	playerRectXY := image.Rect(int(newX), int(newY), int(newX+world.PlayerWidth), int(newY+world.PlayerHeight))
+	playerRectG := image.Rect(int(position.X), int(position.Y+gravityCollisionCheck), int(position.X+world.PlayerWidth), int(position.Y+gravityCollisionCheck+world.PlayerHeight))
+
+	var (
+		collideX  bool
+		collideY  bool
+		collideXY bool
+		collideG  bool
+	)
+	for i := range world.MetalRects {
+		if !collideX && world.MetalRects[i].Overlaps(playerRectX) {
+			collideX = true
+		}
+		if !collideY && world.MetalRects[i].Overlaps(playerRectY) {
+			collideY = true
+		}
+		if !collideXY && world.MetalRects[i].Overlaps(playerRectXY) {
+			collideXY = true
+		}
+		if !collideG && world.MetalRects[i].Overlaps(playerRectG) {
+			collideG = true
+		}
+	}
+	if collideXY || collideX || collideY {
+		if collideY {
+			if !collideX {
+				position.X = position.X + vx
+			} else {
+				s.Velocity.X = 0
+			}
+			s.Velocity.Y = 0
+		} else if collideX {
+			if !collideY {
+				position.Y = position.Y + vy
+			} else {
+				s.Velocity.Y = 0
+			}
+			s.Velocity.X = 0
+		} else {
+			s.Velocity.X = 0
+			s.Velocity.Y = 0
+		}
+	} else {
+		position.X, position.Y = position.X+vx, position.Y+vy
+	}
+
+	world.MagnetActive = ebiten.IsKeyPressed(ebiten.KeySpace)
+
+	gravityX, gravityY := 0.0, 0.01
+
+	// Magnetize against nearest wall.
+	var clinging bool
+	if world.MagnetActive && !collideG {
+		wallThreshold := 16.0
+
+		playerRectL := image.Rect(int(position.X-wallThreshold), int(position.Y), int(position.X-wallThreshold+world.PlayerWidth), int(position.Y+world.PlayerHeight))
+		playerRectR := image.Rect(int(position.X+wallThreshold), int(position.Y), int(position.X+wallThreshold+world.PlayerWidth), int(position.Y+world.PlayerHeight))
+
+		var (
+			collideL bool
+			collideR bool
+		)
+		for i := range world.MetalRects {
+			if !collideL && world.MetalRects[i].Overlaps(playerRectL) {
+				collideL = true
+			}
+			if !collideR && world.MetalRects[i].Overlaps(playerRectR) {
+				collideR = true
+			}
+		}
+		if collideL || collideR {
+			log.Println("ground collision", collideG)
+			log.Println("cling", velocity.Y)
+
+			clinging = true
+
+			if collideL {
+				gravityX, gravityY = -0.01, 0.00
+			} else {
+				gravityX, gravityY = 0.01, 0.00
+			}
+		}
+	}
+
+	const dampen = 40
+
+	world.Clinging = clinging
+	if clinging || true {
+		if s.Velocity.Y < 0 {
+			s.Velocity.Y -= s.Velocity.Y / dampen
+		} else if s.Velocity.Y > 0 {
+			s.Velocity.Y -= s.Velocity.Y / dampen
+		}
+	}
+
+	if s.Velocity.X < 0 {
+		s.Velocity.X -= s.Velocity.X / dampen
+	} else if s.Velocity.X > 0 {
+		s.Velocity.X -= s.Velocity.X / dampen
+	}
+
+	// Apply gravity.
+	const maxSpeed = 8.0
+	s.Velocity.X, s.Velocity.Y = s.Velocity.X+gravityX, s.Velocity.Y+gravityY
+	if s.Velocity.X < -maxSpeed {
+		s.Velocity.X = -maxSpeed
+	} else if s.Velocity.X > maxSpeed {
+		s.Velocity.X = maxSpeed
+	}
+	if s.Velocity.Y < -maxSpeed {
+		s.Velocity.Y = -maxSpeed
+	} else if s.Velocity.Y > maxSpeed {
+		s.Velocity.Y = maxSpeed
+	}
+
+	// Update player sprite.
+	s.Sprite.HorizontalFlip = world.LastWalkDirL
+	s.Sprite.VerticalFlip = false
+
+	offsetY := -12.0
+
+	idleFrames := asset.PlayerIdleFrames
+	walkFrames := asset.PlayerWalkFrames
+	if gravityX < 0 {
+		idleFrames = asset.PlayerIdleFramesRot90
+		walkFrames = asset.PlayerWalkFramesRot90
+		s.Sprite.VerticalFlip = world.LastWalkDirU
+		s.Sprite.HorizontalFlip = false
+
+		offsetY = 0
+	} else if gravityX > 0 {
+		idleFrames = asset.PlayerIdleFramesRot90
+		walkFrames = asset.PlayerWalkFramesRot90
+		s.Sprite.VerticalFlip = world.LastWalkDirU
+		s.Sprite.HorizontalFlip = true
+
+		offsetY = 0
+	}
+
+	s.Sprite.OffsetY = offsetY
+
+	const walkThreshold = 0.04
+	walking := s.Velocity.X < -walkThreshold || s.Velocity.X > walkThreshold || s.Velocity.Y < -walkThreshold || s.Velocity.Y > walkThreshold
+	if walking {
+		s.Sprite.Frames = walkFrames
+	} else {
+		s.Sprite.Frames = idleFrames
+	}
+}
+
+// handleScreenCollisions forces the player to remain within the screen bounds.
+func (s *MovementSystem) handleScreenCollisions(e gohan.Entity) {
+	if e != world.Player {
+		return
+	}
+	position := s.Position
+
+	screenX, screenY := s.levelCoordinatesToScreen(position.X, position.Y)
+	if screenX < 0 {
+		diff := screenX
+		position.X -= diff
+	} else if screenX > float64(world.ScreenWidth)-world.PlayerWidth {
+		diff := float64(world.ScreenWidth) - world.PlayerWidth - screenX
+		position.X += diff
+	}
+	if screenY < 0 {
+		diff := screenY
+		position.Y -= diff
+	} else if screenY > float64(world.ScreenHeight)-world.PlayerHeight {
+		diff := float64(world.ScreenHeight) - world.PlayerHeight - screenY
+		position.Y += diff
+	}
+}
diff --git a/system/render.go b/system/render.go
new file mode 100644
index 0000000..97d97b9
--- /dev/null
+++ b/system/render.go
@@ -0,0 +1,126 @@
+package system
+
+import (
+	_ "image/png"
+	"time"
+
+	"code.rocketnine.space/tslocum/doctorlectro/component"
+	"code.rocketnine.space/tslocum/doctorlectro/world"
+	"code.rocketnine.space/tslocum/gohan"
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+const (
+	TileWidth = 16
+)
+
+type RenderSystem struct {
+	Position *component.Position
+	Sprite   *component.Sprite
+
+	img *ebiten.Image            `gohan:"-"`
+	op  *ebiten.DrawImageOptions `gohan:"-"`
+
+	camScale float64 `gohan:"-"`
+
+	renderer gohan.Entity `gohan:"-"`
+}
+
+func NewRenderSystem() *RenderSystem {
+	s := &RenderSystem{
+		renderer: gohan.NewEntity(),
+		img:      ebiten.NewImage(320, 100),
+		op:       &ebiten.DrawImageOptions{},
+		camScale: 1,
+	}
+
+	return s
+}
+
+func (s *RenderSystem) Update(_ gohan.Entity) error {
+	return gohan.ErrUnregister
+}
+
+func (s *RenderSystem) levelCoordinatesToScreen(x, y float64) (float64, float64) {
+	px, py := world.CamX, world.CamY
+	py *= -1
+	return (x - px) * s.camScale, (y + py) * s.camScale
+}
+
+// renderSprite renders a sprite on the screen.
+func (s *RenderSystem) renderSprite(x float64, y float64, offsetx float64, offsety float64, angle float64, geoScale float64, colorScale float64, alpha float64, hFlip bool, vFlip bool, sprite *ebiten.Image, target *ebiten.Image) int {
+	if alpha < .01 || colorScale < .01 {
+		return 0
+	}
+
+	// Skip drawing off-screen tiles.
+	drawX, drawY := s.levelCoordinatesToScreen(x, y)
+	const padding = TileWidth * 4
+	width, height := float64(TileWidth), float64(TileWidth)
+	left := drawX
+	right := drawX + width
+	top := drawY
+	bottom := drawY + height
+	if (left < -padding || left > float64(world.ScreenWidth)+padding) || (top < -padding || top > float64(world.ScreenHeight)+padding) ||
+		(right < -padding || right > float64(world.ScreenWidth)+padding) || (bottom < -padding || bottom > float64(world.ScreenHeight)+padding) {
+		return 0
+	}
+
+	s.op.GeoM.Reset()
+
+	if hFlip {
+		s.op.GeoM.Scale(-1, 1)
+		s.op.GeoM.Translate(TileWidth, 0)
+	}
+	if vFlip {
+		s.op.GeoM.Scale(1, -1)
+		s.op.GeoM.Translate(0, TileWidth)
+	}
+
+	s.op.GeoM.Scale(geoScale, geoScale)
+	// Rotate
+	s.op.GeoM.Translate(offsetx, offsety)
+	s.op.GeoM.Rotate(angle)
+	// Move to current isometric position.
+	s.op.GeoM.Translate(x, y)
+	// Translate camera position.
+	s.op.GeoM.Translate(-world.CamX, -world.CamY)
+	// Zoom.
+	s.op.GeoM.Scale(s.camScale, s.camScale)
+	// Center.
+	//s.op.GeoM.Translate(float64(s.ScreenW/2.0), float64(s.ScreenH/2.0))
+
+	s.op.ColorM.Scale(colorScale, colorScale, colorScale, alpha)
+
+	target.DrawImage(sprite, s.op)
+
+	s.op.ColorM.Reset()
+
+	return 1
+}
+
+func (s *RenderSystem) Draw(e gohan.Entity, screen *ebiten.Image) error {
+	if !world.GameStarted {
+		return nil
+	}
+
+	position := s.Position
+	sprite := s.Sprite
+
+	if sprite.NumFrames > 0 && time.Since(sprite.LastFrame) > sprite.FrameTime && (sprite.FrameTime != 0 || sprite.Image == nil) {
+		sprite.Frame++
+		if sprite.Frame >= sprite.NumFrames {
+			sprite.Frame = 0
+		}
+		sprite.Image = sprite.Frames[sprite.Frame]
+		sprite.LastFrame = time.Now()
+	}
+
+	colorScale := 1.0
+	if sprite.OverrideColorScale {
+		colorScale = sprite.ColorScale
+	}
+
+	s.renderSprite(position.X, position.Y, sprite.OffsetX, sprite.OffsetY, sprite.Angle, 1.0, colorScale, 1.0, sprite.HorizontalFlip, sprite.VerticalFlip, sprite.Image, screen)
+	return nil
+}
diff --git a/system/renderdebug.go b/system/renderdebug.go
new file mode 100644
index 0000000..0075ac8
--- /dev/null
+++ b/system/renderdebug.go
@@ -0,0 +1,49 @@
+package system
+
+import (
+	"fmt"
+	"image/color"
+	_ "image/png"
+
+	"code.rocketnine.space/tslocum/doctorlectro/component"
+	"code.rocketnine.space/tslocum/doctorlectro/world"
+	"code.rocketnine.space/tslocum/gohan"
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
+)
+
+type RenderDebugTextSystem struct {
+	Position *component.Position
+	Velocity *component.Velocity
+	Player   *component.Player
+
+	op       *ebiten.DrawImageOptions
+	debugImg *ebiten.Image
+}
+
+func NewRenderDebugTextSystem() *RenderDebugTextSystem {
+	s := &RenderDebugTextSystem{
+		op:       &ebiten.DrawImageOptions{},
+		debugImg: ebiten.NewImage(94, 114),
+	}
+
+	return s
+}
+
+func (s *RenderDebugTextSystem) Update(_ gohan.Entity) error {
+	return gohan.ErrUnregister
+}
+
+func (s *RenderDebugTextSystem) Draw(e gohan.Entity, screen *ebiten.Image) error {
+	if world.Debug <= 0 {
+		return nil
+	}
+
+	position := s.Position
+	velocity := s.Velocity
+
+	s.debugImg.Fill(color.RGBA{0, 0, 0, 80})
+	ebitenutil.DebugPrint(s.debugImg, fmt.Sprintf("POS %.0f,%.0f\nVEL %.2f,%.2f\nENT %d\nUPD %d\nDRA %d\nTPS %0.0f\nFPS %0.0f", position.X, position.Y, velocity.X, velocity.Y, gohan.CurrentEntities(), gohan.CurrentUpdates(), gohan.CurrentDraws(), ebiten.CurrentTPS(), ebiten.CurrentFPS()))
+	screen.DrawImage(s.debugImg, nil)
+	return nil
+}
diff --git a/world/world.go b/world/world.go
new file mode 100644
index 0000000..83381b8
--- /dev/null
+++ b/world/world.go
@@ -0,0 +1,78 @@
+package world
+
+import (
+	"image"
+	"log"
+
+	"code.rocketnine.space/tslocum/doctorlectro/component"
+	"code.rocketnine.space/tslocum/gohan"
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/lafriks/go-tiled"
+)
+
+const (
+	ScreenWidth  = 960
+	ScreenHeight = 540
+)
+
+const TileSize = 16
+
+const (
+	PlayerWidth  = 15.0
+	PlayerHeight = 15.0
+)
+
+var (
+	Debug int
+
+	// DisableEsc is set to true when the escape key should not exit the game.
+	// This is used on WASM builds, where users exit the game by closing the tab.
+	DisableEsc bool
+
+	// GameStarted is set to true when the intro screens and cutscenes have ended,
+	// and gameplay has started.
+	GameStarted bool
+
+	// GodMode is set to true when the player is invulnerable. This is only
+	// available to users as a commandline flag.
+	GodMode bool
+
+	Map *tiled.Map
+
+	TileImages = make(map[uint32]*ebiten.Image)
+
+	ObjectGroups []*tiled.ObjectGroup
+
+	GameOver bool
+
+	ResetGame bool
+
+	Player gohan.Entity
+
+	CamX, CamY = 16.0, 16.0
+
+	SpawnX, SpawnY float64
+
+	MetalRects []image.Rectangle
+
+	MagnetActive bool
+
+	Clinging bool
+
+	LastWalkDirL, LastWalkDirU bool
+)
+
+func StartGame() {
+	if GameStarted {
+		return
+	}
+
+	GameStarted = true
+
+	Player.With(func(position *component.Position) {
+		position.X, position.Y = SpawnX, SpawnY
+	})
+	log.Println(SpawnX, SpawnY)
+
+	// TODO skip intro cutscenes
+}