New drawing system, start of inventory menu

game/game.go

@@ -2,13 +2,15 @@ package game
 
 import (
 	"mvvasilev/last_light/game/state"
+	"mvvasilev/last_light/render"
 
 	"github.com/gdamore/tcell/v2"
-	"github.com/gdamore/tcell/v2/views"
 )
 
 type Game struct {
 	state state.GameState
+
+	quitGame bool
 }
 
 func CreateGame() *Game {
@@ -20,10 +22,18 @@ func CreateGame() *Game {
 }
 
 func (g *Game) Input(ev *tcell.EventKey) {
+	if ev.Key() == tcell.KeyCtrlC {
+		g.quitGame = true
+	}
+
 	g.state.OnInput(ev)
 }
 
 func (g *Game) Tick(dt int64) bool {
+	if g.quitGame {
+		return false
+	}
+
 	s := g.state.OnTick(dt)
 
 	switch s.(type) {
@@ -36,6 +46,6 @@ func (g *Game) Tick(dt int64) bool {
 	return true
 }
 
-func (g *Game) Draw(v views.View) {
-	g.state.OnDraw(v)
+func (g *Game) CollectDrawables() []render.Drawable {
+	return g.state.CollectDrawables()
 }

game/game_context.go

@@ -0,0 +1,55 @@
+package game
+
+import (
+	"log"
+	"mvvasilev/last_light/render"
+	"os"
+	"time"
+)
+
+const TICK_RATE int64 = 50 // tick every 50ms ( 20 ticks per second )
+
+type GameContext struct {
+	renderContext *render.RenderContext
+
+	game *Game
+}
+
+func CreateGameContext() *GameContext {
+	gc := new(GameContext)
+
+	rc, err := render.CreateRenderContext()
+
+	if err != nil {
+		log.Fatalf("%~v", err)
+	}
+
+	gc.renderContext = rc
+	gc.game = CreateGame()
+
+	return gc
+}
+
+func (gc *GameContext) Run() {
+	lastTick := time.Now()
+
+	for {
+		deltaTime := 1 + time.Since(lastTick).Microseconds()
+		lastTick = time.Now()
+
+		for _, e := range gc.renderContext.CollectInputEvents() {
+			gc.game.Input(e)
+		}
+
+		stop := !gc.game.Tick(deltaTime)
+
+		if stop {
+			gc.renderContext.Stop()
+			os.Exit(0)
+			break
+		}
+
+		drawables := gc.game.CollectDrawables()
+		gc.renderContext.Draw(deltaTime, drawables)
+	}
+}

game/model/dungeon.go

@@ -0,0 +1 @@
+package model

game/model/empty_dungeon_level.go

@@ -0,0 +1,47 @@
+package model
+
+import "mvvasilev/last_light/util"
+
+type EmptyDungeonLevel struct {
+	tiles [][]Tile
+}
+
+func CreateEmptyDungeonLevel(width, height int) *EmptyDungeonLevel {
+	m := new(EmptyDungeonLevel)
+
+	m.tiles = make([][]Tile, height)
+
+	for h := range height {
+		m.tiles[h] = make([]Tile, width)
+	}
+
+	return m
+}
+
+func (edl *EmptyDungeonLevel) Size() util.Size {
+	return util.SizeOf(len(edl.tiles[0]), len(edl.tiles))
+}
+
+func (edl *EmptyDungeonLevel) SetTileAt(x int, y int, t Tile) {
+	if len(edl.tiles) <= y || len(edl.tiles[0]) <= x {
+		return
+	}
+
+	edl.tiles[y][x] = t
+}
+
+func (edl *EmptyDungeonLevel) TileAt(x int, y int) Tile {
+	if y < 0 || y >= len(edl.tiles) {
+		return nil
+	}
+
+	if x < 0 || x >= len(edl.tiles[y]) {
+		return nil
+	}
+
+	return edl.tiles[y][x]
+}
+
+func (edl *EmptyDungeonLevel) Tick() {
+
+}

game/model/entity.go

@@ -4,22 +4,36 @@ import (
 	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
-	"github.com/gdamore/tcell/v2/views"
 	"github.com/google/uuid"
 )
 
 type Direction int
 
 const (
-	Up Direction = iota
-	Down
-	Left
-	Right
+	DirectionNone Direction = iota
+	DirectionUp
+	DirectionDown
+	DirectionLeft
+	DirectionRight
 )
 
+func MovementDirectionOffset(dir Direction) (int, int) {
+	switch dir {
+	case DirectionUp:
+		return 0, -1
+	case DirectionDown:
+		return 0, 1
+	case DirectionLeft:
+		return -1, 0
+	case DirectionRight:
+		return 1, 0
+	}
+
+	return 0, 0
+}
+
 type Entity interface {
 	UniqueId() uuid.UUID
-	Draw(v views.View)
 	Input(e *tcell.EventKey)
 	Tick(dt int64)
 }

game/model/flat_ground_dungeon_level.go

@@ -0,0 +1,75 @@
+package model
+
+import (
+	"math/rand"
+	"mvvasilev/last_light/util"
+
+	"github.com/gdamore/tcell/v2"
+)
+
+type FlatGroundDungeonLevel struct {
+	tiles [][]Tile
+}
+
+func CreateFlatGroundDungeonLevel(width, height int) *FlatGroundDungeonLevel {
+	level := new(FlatGroundDungeonLevel)
+
+	level.tiles = make([][]Tile, height)
+
+	for h := range height {
+		level.tiles[h] = make([]Tile, width)
+
+		for w := range width {
+			if w == 0 || h == 0 || w >= width-1 || h >= height-1 {
+				level.tiles[h][w] = CreateStaticTile(w, h, Rock())
+				continue
+			}
+
+			level.tiles[h][w] = genRandomGroundTile(w, h)
+		}
+	}
+
+	return level
+}
+
+func genRandomGroundTile(width, height int) Tile {
+	switch rand.Intn(2) {
+	case 0:
+		return CreateStaticTile(width, height, Ground())
+	case 1:
+		return CreateStaticTile(width, height, Grass())
+	default:
+		return CreateStaticTile(width, height, Ground())
+	}
+}
+
+func (edl *FlatGroundDungeonLevel) Size() util.Size {
+	return util.SizeOfInt(len(edl.tiles[0]), len(edl.tiles))
+}
+
+func (edl *FlatGroundDungeonLevel) SetTileAt(x int, y int, t Tile) {
+	if len(edl.tiles) <= y || len(edl.tiles[0]) <= x {
+		return
+	}
+
+	edl.tiles[y][x] = t
+}
+
+func (edl *FlatGroundDungeonLevel) TileAt(x int, y int) Tile {
+	if y < 0 || y >= len(edl.tiles) {
+		return nil
+	}
+
+	if x < 0 || x >= len(edl.tiles[y]) {
+		return nil
+	}
+
+	return edl.tiles[y][x]
+}
+
+func (edl *FlatGroundDungeonLevel) Input(e *tcell.EventKey) {
+
+}
+
+func (edl *FlatGroundDungeonLevel) Tick() {
+}

game/model/map.go

@@ -0,0 +1,12 @@
+package model
+
+import (
+	"mvvasilev/last_light/util"
+)
+
+type Map interface {
+	Size() util.Size
+	SetTileAt(x, y int, t Tile)
+	TileAt(x, y int) Tile
+	Tick()
+}

game/model/multilevel_map.go

@@ -0,0 +1,61 @@
+package model
+
+import "mvvasilev/last_light/util"
+
+type MultilevelMap struct {
+	layers []Map
+}
+
+func CreateMultilevelMap(maps ...Map) *MultilevelMap {
+	m := new(MultilevelMap)
+
+	m.layers = maps
+
+	return m
+}
+
+func (mm *MultilevelMap) Size() util.Size {
+	if len(mm.layers) == 0 {
+		return util.SizeOf(0, 0)
+	}
+
+	return mm.layers[0].Size()
+}
+
+func (mm *MultilevelMap) SetTileAt(x, y int, t Tile) {
+	mm.layers[0].SetTileAt(x, y, t)
+}
+
+func (mm *MultilevelMap) UnsetTileAtHeight(x, y, height int) {
+	if len(mm.layers) < height {
+		return
+	}
+
+	mm.layers[height].SetTileAt(x, y, nil)
+}
+
+func (mm *MultilevelMap) SetTileAtHeight(x, y, height int, t Tile) {
+	if len(mm.layers) < height {
+		return
+	}
+
+	mm.layers[height].SetTileAt(x, y, t)
+}
+
+func (mm *MultilevelMap) TileAt(x int, y int) Tile {
+	for i := len(mm.layers) - 1; i >= 0; i-- {
+		tile := mm.layers[i].TileAt(x, y)
+
+		if tile != nil {
+			return tile
+		}
+	}
+
+	return nil
+}
+
+func (mm *MultilevelMap) Tick() {
+	for _, l := range mm.layers {
+		l.Tick()
+	}
+}

game/model/player.go

@@ -4,17 +4,15 @@ import (
 	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
-	"github.com/gdamore/tcell/v2/views"
 	"github.com/google/uuid"
 )
 
 type Player struct {
 	id       uuid.UUID
 	position util.Position
-	style    tcell.Style
 }
 
-func CreatePlayer(x, y uint16, style tcell.Style) *Player {
+func CreatePlayer(x, y int) *Player {
 	p := new(Player)
 
 	p.id = uuid.New()
@@ -27,48 +25,23 @@ func (p *Player) UniqueId() uuid.UUID {
 	return p.id
 }
 
-func (p *Player) Move(dir Direction) {
-	x, y := p.position.XYUint16()
-
-	switch dir {
-	case Up:
-		p.position = util.PositionAt(x, y-1)
-	case Down:
-		p.position = util.PositionAt(x, y+1)
-	case Left:
-		p.position = util.PositionAt(x-1, y)
-	case Right:
-		p.position = util.PositionAt(x+1, y)
-	}
+func (p *Player) Position() util.Position {
+	return p.position
 }
 
-func (p *Player) Draw(v views.View) {
-	x, y := p.position.XY()
-	v.SetContent(x, y, '@', nil, p.style)
+func (p *Player) Move(dir Direction) {
+	p.position = p.Position().WithOffset(MovementDirectionOffset(dir))
+}
+
+func (p *Player) Presentation() rune {
+	return '@'
+}
+
+func (p *Player) Passable() bool {
+	return false
 }
 
 func (p *Player) Input(e *tcell.EventKey) {
-	switch e.Key() {
-	case tcell.KeyUp:
-		p.Move(Up)
-	case tcell.KeyDown:
-		p.Move(Down)
-	case tcell.KeyLeft:
-		p.Move(Left)
-	case tcell.KeyRight:
-		p.Move(Right)
-	case tcell.KeyRune:
-		switch e.Rune() {
-		case 'w':
-			p.Move(Up)
-		case 'a':
-			p.Move(Left)
-		case 's':
-			p.Move(Down)
-		case 'd':
-			p.Move(Right)
-		}
-	}
 }
 
 func (p *Player) Tick(dt int64) {

game/model/tile.go

@@ -0,0 +1,86 @@
+package model
+
+import "mvvasilev/last_light/util"
+
+type Material uint
+
+const (
+	MaterialGround Material = iota
+	MaterialRock
+	MaterialGrass
+	MaterialVoid
+)
+
+type TileType struct {
+	Material     Material
+	Passable     bool
+	Presentation rune
+}
+
+func Ground() TileType {
+	return TileType{
+		Material:     MaterialGround,
+		Passable:     true,
+		Presentation: '.',
+	}
+}
+
+func Rock() TileType {
+	return TileType{
+		Material:     MaterialRock,
+		Passable:     false,
+		Presentation: '█',
+	}
+}
+
+func Grass() TileType {
+	return TileType{
+		Material:     MaterialGrass,
+		Passable:     true,
+		Presentation: ',',
+	}
+}
+
+func Void() TileType {
+	return TileType{
+		Material:     MaterialVoid,
+		Passable:     false,
+		Presentation: ' ',
+	}
+}
+
+type Tile interface {
+	Position() util.Position
+	Presentation() rune
+	Passable() bool
+}
+
+type StaticTile struct {
+	position util.Position
+	t        TileType
+}
+
+func CreateStaticTile(x, y int, t TileType) Tile {
+	st := new(StaticTile)
+
+	st.position = util.PositionAt(x, y)
+	st.t = t
+
+	return st
+}
+
+func (st *StaticTile) Position() util.Position {
+	return st.position
+}
+
+func (st *StaticTile) Presentation() rune {
+	return st.t.Presentation
+}
+
+func (st *StaticTile) Passable() bool {
+	return st.t.Passable
+}
+
+func (st *StaticTile) Type() TileType {
+	return st.t
+}

game/state/game_state.go

@@ -1,14 +1,15 @@
 package state
 
 import (
+	"mvvasilev/last_light/render"
+
 	"github.com/gdamore/tcell/v2"
-	"github.com/gdamore/tcell/v2/views"
 )
 
 type GameState interface {
 	OnInput(e *tcell.EventKey)
 	OnTick(dt int64) GameState
-	OnDraw(c views.View)
+	CollectDrawables() []render.Drawable
 }
 
 type PausableState interface {

game/state/inventory_screen_state.go

@@ -0,0 +1,51 @@
+package state
+
+import (
+	"mvvasilev/last_light/game/model"
+	"mvvasilev/last_light/render"
+	"mvvasilev/last_light/ui"
+
+	"github.com/gdamore/tcell/v2"
+)
+
+type InventoryScreenState struct {
+	prevState GameState
+	exitMenu  bool
+
+	inventoryMenu *ui.UIWindow
+
+	player *model.Player
+}
+
+func CreateInventoryScreenState(player *model.Player, prevState GameState) *InventoryScreenState {
+	iss := new(InventoryScreenState)
+
+	iss.prevState = prevState
+	iss.player = player
+	iss.exitMenu = false
+
+	iss.inventoryMenu = ui.CreateWindow(40, 0, 40, 24, "INVENTORY", tcell.StyleDefault)
+
+	return iss
+}
+
+func (iss *InventoryScreenState) OnInput(e *tcell.EventKey) {
+	if e.Key() == tcell.KeyEsc || (e.Key() == tcell.KeyRune && e.Rune() == 'i') {
+		iss.exitMenu = true
+	}
+}
+
+func (iss *InventoryScreenState) OnTick(dt int64) GameState {
+	if iss.exitMenu {
+		return iss.prevState
+	}
+
+	return iss
+}
+
+func (iss *InventoryScreenState) CollectDrawables() []render.Drawable {
+	return append(
+		iss.prevState.CollectDrawables(),
+		iss.inventoryMenu,
+	)
+}

game/state/main_menu_state.go

@@ -6,7 +6,6 @@ import (
 	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
-	"github.com/gdamore/tcell/v2/views"
 )
 
 type MainMenuState struct {
@@ -78,10 +77,14 @@ func (mms *MainMenuState) OnTick(dt int64) GameState {
 	return mms
 }
 
-func (mms *MainMenuState) OnDraw(c views.View) {
-	mms.menuTitle.Draw(c)
+func (mms *MainMenuState) CollectDrawables() []render.Drawable {
+	arr := make([]render.Drawable, 0)
+
+	arr = append(arr, mms.menuTitle)
 
 	for _, b := range mms.buttons {
-		b.Draw(c)
+		arr = append(arr, b)
 	}
+
+	return arr
 }

game/state/pause_game_state.go

@@ -6,7 +6,6 @@ import (
 	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
-	"github.com/gdamore/tcell/v2/views"
 )
 
 type PauseGameState struct {
@@ -27,13 +26,13 @@ func PauseGame(prevState PausableState) *PauseGameState {
 
 	highlightStyle := tcell.StyleDefault.Attributes(tcell.AttrBold)
 
-	s.pauseMenuWindow = ui.CreateWindow(uint16(render.TERMINAL_SIZE_WIDTH)/2-15, uint16(render.TERMINAL_SIZE_HEIGHT)/2-7, 30, 14, "PAUSED", tcell.StyleDefault)
+	s.pauseMenuWindow = ui.CreateWindow(int(render.TERMINAL_SIZE_WIDTH)/2-15, int(render.TERMINAL_SIZE_HEIGHT)/2-7, 30, 14, "PAUSED", tcell.StyleDefault)
 	s.buttons = make([]*ui.UISimpleButton, 0)
 	s.buttons = append(
 		s.buttons,
 		ui.CreateSimpleButton(
-			uint16(s.pauseMenuWindow.Position().X())+3,
-			uint16(s.pauseMenuWindow.Position().Y())+1,
+			int(s.pauseMenuWindow.Position().X())+3,
+			int(s.pauseMenuWindow.Position().Y())+1,
 			"Resume",
 			tcell.StyleDefault,
 			highlightStyle,
@@ -45,8 +44,8 @@ func PauseGame(prevState PausableState) *PauseGameState {
 	s.buttons = append(
 		s.buttons,
 		ui.CreateSimpleButton(
-			uint16(s.pauseMenuWindow.Position().X())+3,
-			uint16(s.pauseMenuWindow.Position().Y())+3,
+			int(s.pauseMenuWindow.Position().X())+3,
+			int(s.pauseMenuWindow.Position().Y())+3,
 			"Exit To Main Menu",
 			tcell.StyleDefault,
 			highlightStyle,
@@ -97,12 +96,16 @@ func (pg *PauseGameState) OnTick(dt int64) GameState {
 	return pg
 }
 
-func (pg *PauseGameState) OnDraw(c views.View) {
-	pg.prevState.OnDraw(c)
+func (pg *PauseGameState) CollectDrawables() []render.Drawable {
+	arr := make([]render.Drawable, 0)
 
-	pg.pauseMenuWindow.Draw(c)
+	arr = append(arr, pg.prevState.CollectDrawables()...)
+
+	arr = append(arr, pg.pauseMenuWindow)
 
 	for _, b := range pg.buttons {
-		b.Draw(c)
+		arr = append(arr, b)
 	}
+
+	return arr
 }

game/state/playingState.go

@@ -1,56 +0,0 @@
-package state
-
-import (
-	"mvvasilev/last_light/game/model"
-
-	"github.com/gdamore/tcell/v2"
-	"github.com/gdamore/tcell/v2/views"
-)
-
-type PlayingState struct {
-	player *model.Player
-
-	pauseGame bool
-}
-
-func BeginPlayingState() *PlayingState {
-	s := new(PlayingState)
-
-	s.player = model.CreatePlayer(10, 10, tcell.StyleDefault)
-
-	return s
-}
-
-func (ps *PlayingState) Pause() {
-	ps.pauseGame = true
-}
-
-func (ps *PlayingState) Unpause() {
-	ps.pauseGame = false
-}
-
-func (ps *PlayingState) SetPaused(paused bool) {
-	ps.pauseGame = paused
-}
-
-func (ps *PlayingState) OnInput(e *tcell.EventKey) {
-	ps.player.Input(e)
-
-	if e.Key() == tcell.KeyEsc {
-		ps.pauseGame = true
-	}
-}
-
-func (ps *PlayingState) OnTick(dt int64) GameState {
-	ps.player.Tick(dt)
-
-	if ps.pauseGame {
-		return PauseGame(ps)
-	}
-
-	return ps
-}
-
-func (ps *PlayingState) OnDraw(c views.View) {
-	ps.player.Draw(c)
-}

game/state/playing_state.go

@@ -0,0 +1,144 @@
+package state
+
+import (
+	"mvvasilev/last_light/game/model"
+	"mvvasilev/last_light/render"
+	"mvvasilev/last_light/util"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/gdamore/tcell/v2/views"
+)
+
+type PlayingState struct {
+	player *model.Player
+	level  *model.MultilevelMap
+
+	viewport *render.Viewport
+
+	movePlayerDirection model.Direction
+	pauseGame           bool
+	openInventory       bool
+}
+
+func BeginPlayingState() *PlayingState {
+	s := new(PlayingState)
+
+	mapSize := util.SizeOf(128, 128)
+
+	s.player = model.CreatePlayer(40, 12)
+
+	s.level = model.CreateMultilevelMap(
+		model.CreateFlatGroundDungeonLevel(mapSize.WH()),
+		model.CreateEmptyDungeonLevel(mapSize.WH()),
+	)
+
+	s.level.SetTileAtHeight(40, 12, 1, s.player)
+
+	s.viewport = render.CreateViewport(
+		util.PositionAt(0, 0),
+		util.PositionAt(40, 12),
+		util.SizeOf(80, 24),
+		tcell.StyleDefault,
+	)
+
+	return s
+}
+
+func (ps *PlayingState) Pause() {
+	ps.pauseGame = true
+}
+
+func (ps *PlayingState) Unpause() {
+	ps.pauseGame = false
+}
+
+func (ps *PlayingState) SetPaused(paused bool) {
+	ps.pauseGame = paused
+}
+
+func (ps *PlayingState) MovePlayer() {
+	if ps.movePlayerDirection == model.DirectionNone {
+		return
+	}
+
+	newPlayerPos := ps.player.Position().WithOffset(model.MovementDirectionOffset(ps.movePlayerDirection))
+
+	tileAtMovePos := ps.level.TileAt(newPlayerPos.XY())
+
+	if tileAtMovePos.Passable() {
+		ps.level.SetTileAtHeight(ps.player.Position().X(), ps.player.Position().Y(), 1, nil)
+		ps.player.Move(ps.movePlayerDirection)
+		ps.viewport.SetCenter(ps.player.Position())
+		ps.level.SetTileAtHeight(ps.player.Position().X(), ps.player.Position().Y(), 1, ps.player)
+	}
+
+	ps.movePlayerDirection = model.DirectionNone
+}
+
+func (ps *PlayingState) OnInput(e *tcell.EventKey) {
+	ps.player.Input(e)
+
+	if e.Key() == tcell.KeyEsc {
+		ps.pauseGame = true
+		return
+	}
+
+	if e.Key() == tcell.KeyRune && e.Rune() == 'i' {
+		ps.openInventory = true
+		return
+	}
+
+	switch e.Key() {
+	case tcell.KeyUp:
+		ps.movePlayerDirection = model.DirectionUp
+	case tcell.KeyDown:
+		ps.movePlayerDirection = model.DirectionDown
+	case tcell.KeyLeft:
+		ps.movePlayerDirection = model.DirectionLeft
+	case tcell.KeyRight:
+		ps.movePlayerDirection = model.DirectionRight
+	case tcell.KeyRune:
+		switch e.Rune() {
+		case 'w':
+			ps.movePlayerDirection = model.DirectionUp
+		case 'a':
+			ps.movePlayerDirection = model.DirectionLeft
+		case 's':
+			ps.movePlayerDirection = model.DirectionDown
+		case 'd':
+			ps.movePlayerDirection = model.DirectionRight
+		}
+	}
+}
+
+func (ps *PlayingState) OnTick(dt int64) GameState {
+	ps.player.Tick(dt)
+
+	if ps.pauseGame {
+		return PauseGame(ps)
+	}
+
+	if ps.openInventory {
+		return CreateInventoryScreenState(ps.player, ps)
+	}
+
+	if ps.movePlayerDirection != model.DirectionNone {
+		ps.MovePlayer()
+	}
+
+	return ps
+}
+
+func (ps *PlayingState) CollectDrawables() []render.Drawable {
+	return render.Multidraw(render.CreateDrawingInstructions(func(v views.View) {
+		ps.viewport.DrawFromProvider(v, func(x, y int) rune {
+			tile := ps.level.TileAt(x, y)
+
+			if tile != nil {
+				return tile.Presentation()
+			}
+
+			return ' '
+		})
+	}))
+}

game/state/quit_state.go

@@ -1,8 +1,9 @@
 package state
 
 import (
+	"mvvasilev/last_light/render"
+
 	"github.com/gdamore/tcell/v2"
-	"github.com/gdamore/tcell/v2/views"
 )
 
 type QuitState struct {
@@ -16,6 +17,6 @@ func (q *QuitState) OnTick(dt int64) GameState {
 	return q
 }
 
-func (q *QuitState) OnDraw(c views.View) {
-
+func (q *QuitState) CollectDrawables() []render.Drawable {
+	return render.Multidraw(nil)
 }

main.go

@@ -1,53 +1,8 @@
 package main
 
-import (
-	"fmt"
-	"log"
-	"mvvasilev/last_light/game"
-	"mvvasilev/last_light/render"
-	"os"
-
-	"github.com/gdamore/tcell/v2"
-	"github.com/gdamore/tcell/v2/views"
-)
+import "mvvasilev/last_light/game"
 
 func main() {
-
-	c, err := render.CreateRenderContext()
-
-	if err != nil {
-		log.Fatalf("%~v", err)
-	}
-
-	g := game.CreateGame()
-
-	c.HandleInput(func(ev *tcell.EventKey) {
-		if ev.Key() == tcell.KeyCtrlC {
-			c.Stop()
-			os.Exit(0)
-		}
-
-		g.Input(ev)
-	})
-
-	defStyle := tcell.StyleDefault.Background(tcell.ColorReset).Foreground(tcell.ColorReset)
-
-	c.HandleRender(func(view views.View, deltaTime int64) {
-		fps := 1_000_000 / deltaTime
-
-		fpsText := render.CreateText(0, 0, 16, 1, fmt.Sprintf("%v FPS", fps), defStyle)
-
-		keepGoing := g.Tick(deltaTime)
-
-		if !keepGoing {
-			c.Stop()
-			os.Exit(0)
-		}
-
-		g.Draw(view)
-
-		fpsText.Draw(view)
-	})
-
-	c.BeginRendering()
+	gc := game.CreateGameContext()
+	gc.Run()
 }

render/arbitrary_drawable.go

@@ -0,0 +1,28 @@
+package render
+
+import (
+	"github.com/gdamore/tcell/v2/views"
+	"github.com/google/uuid"
+)
+
+type ArbitraryDrawable struct {
+	id                  uuid.UUID
+	drawingInstructions func(v views.View)
+}
+
+func CreateDrawingInstructions(instructions func(v views.View)) *ArbitraryDrawable {
+	a := new(ArbitraryDrawable)
+
+	a.id = uuid.New()
+	a.drawingInstructions = instructions
+
+	return a
+}
+
+func (ab *ArbitraryDrawable) UniqueId() uuid.UUID {
+	return ab.id
+}
+
+func (ab *ArbitraryDrawable) Draw(v views.View) {
+	ab.drawingInstructions(v)
+}

render/grid.go

@@ -12,8 +12,8 @@ type Grid struct {
 	id uuid.UUID
 
 	internalCellSize   util.Size
-	numCellsHorizontal uint16
-	numCellsVertical   uint16
+	numCellsHorizontal int
+	numCellsVertical   int
 	position           util.Position
 	style              tcell.Style
 
@@ -40,9 +40,9 @@ type Grid struct {
 }
 
 func CreateSimpleGrid(
-	x, y uint16,
-	cellWidth, cellHeight uint16,
-	numCellsHorizontal, numCellsVertical uint16,
+	x, y int,
+	cellWidth, cellHeight int,
+	numCellsHorizontal, numCellsVertical int,
 	borderRune, fillRune rune,
 	style tcell.Style,
 ) Grid {
@@ -61,12 +61,12 @@ func CreateSimpleGrid(
 // '├', '─', '┼', '┤',
 // '└', '─', '┴', '┘',
 func CreateGrid(
-	x uint16,
-	y uint16,
-	cellWidth uint16,
-	cellHeight uint16,
-	numCellsHorizontal uint16,
-	numCellsVertical uint16,
+	x int,
+	y int,
+	cellWidth int,
+	cellHeight int,
+	numCellsHorizontal int,
+	numCellsVertical int,
 	nwCorner, northBorder, verticalDownwardsTJunction, neCorner,
 	westBorder, fillRune, internalVerticalBorder, eastBorder,
 	horizontalRightTJunction, internalHorizontalBorder, crossJunction, horizontalLeftTJunction,

render/raw.go

@@ -15,7 +15,7 @@ type Raw struct {
 	style    tcell.Style
 }
 
-func CreateRawDrawable(x, y uint16, style tcell.Style, buffer ...string) *Raw {
+func CreateRawDrawable(x, y int, style tcell.Style, buffer ...string) *Raw {
 	r := new(Raw)
 
 	r.position = util.PositionAt(x, y)
@@ -30,10 +30,43 @@ func CreateRawDrawable(x, y uint16, style tcell.Style, buffer ...string) *Raw {
 	return r
 }
 
+func CreateRawDrawableFromBuffer(x, y int, style tcell.Style, buffer [][]rune) *Raw {
+	r := new(Raw)
+
+	r.position = util.PositionAt(x, y)
+	r.buffer = buffer
+
+	return r
+}
+
 func (r *Raw) UniqueId() uuid.UUID {
 	return r.id
 }
 
+func (r *Raw) DrawWithin(screenX, screenY, originX, originY, width, height int, v views.View) {
+	for h := originY; h < originY+height; h++ {
+
+		if h < 0 || h >= len(r.buffer) {
+			screenY += 1
+			continue
+		}
+
+		for w := originX; w < originX+width; w++ {
+			if w < 0 || w >= len(r.buffer[h]) {
+				screenX += 1
+				continue
+			}
+
+			v.SetContent(screenX, screenY, r.buffer[h][w], nil, r.style)
+
+			screenX += 1
+		}
+
+		screenX = 0
+		screenY += 1
+	}
+}
+
 func (r *Raw) Draw(v views.View) {
 	x := r.position.X()
 	y := r.position.Y()

render/rectangle.go

@@ -31,7 +31,7 @@ type Rectangle struct {
 	fillRune rune
 }
 
-func CreateBorderlessRectangle(x, y uint16, width, height uint16, fillRune rune, style tcell.Style) Rectangle {
+func CreateBorderlessRectangle(x, y int, width, height int, fillRune rune, style tcell.Style) Rectangle {
 	return CreateRectangle(
 		x, y, width, height,
 		0, 0, 0,
@@ -41,7 +41,7 @@ func CreateBorderlessRectangle(x, y uint16, width, height uint16, fillRune rune,
 	)
 }
 
-func CreateSimpleEmptyRectangle(x, y uint16, width, height uint16, borderRune rune, style tcell.Style) Rectangle {
+func CreateSimpleEmptyRectangle(x, y int, width, height int, borderRune rune, style tcell.Style) Rectangle {
 	return CreateRectangle(
 		x, y, width, height,
 		borderRune, borderRune, borderRune,
@@ -51,7 +51,7 @@ func CreateSimpleEmptyRectangle(x, y uint16, width, height uint16, borderRune ru
 	)
 }
 
-func CreateSimpleRectangle(x uint16, y uint16, width uint16, height uint16, borderRune rune, fillRune rune, style tcell.Style) Rectangle {
+func CreateSimpleRectangle(x int, y int, width int, height int, borderRune rune, fillRune rune, style tcell.Style) Rectangle {
 	return CreateRectangle(
 		x, y, width, height,
 		borderRune, borderRune, borderRune,
@@ -62,7 +62,7 @@ func CreateSimpleRectangle(x uint16, y uint16, width uint16, height uint16, bord
 }
 
 func CreateRectangleV2(
-	x, y uint16, width, height uint16,
+	x, y int, width, height int,
 	upper, middle, lower string,
 	isBorderless, isFilled bool,
 	style tcell.Style,
@@ -91,10 +91,10 @@ func CreateRectangleV2(
 //
 // )
 func CreateRectangle(
-	x uint16,
-	y uint16,
-	width uint16,
-	height uint16,
+	x int,
+	y int,
+	width int,
+	height int,
 	nwCorner, northBorder, neCorner,
 	westBorder, fillRune, eastBorder,
 	swCorner, southBorder, seCorner rune,

render/render_context.go

@@ -2,8 +2,8 @@ package render
 
 import (
 	"errors"
+	"fmt"
 	"log"
-	"time"
 
 	"github.com/gdamore/tcell/v2"
 	"github.com/gdamore/tcell/v2/views"
@@ -22,39 +22,51 @@ type Drawable interface {
 	Draw(v views.View)
 }
 
+func Multidraw(drawables ...Drawable) []Drawable {
+	arr := make([]Drawable, 0)
+
+	if drawables == nil {
+		return arr
+	}
+
+	for _, d := range drawables {
+		if d == nil {
+			continue
+		}
+
+		arr = append(arr, d)
+	}
+
+	return arr
+}
+
 type RenderContext struct {
-	screen       tcell.Screen
-	view         *views.ViewPort
-	defaultStyle tcell.Style
+	screen tcell.Screen
+	view   *views.ViewPort
 
-	events chan tcell.Event
-	quit   chan struct{}
-
-	lastRenderTime time.Time
-
-	renderHandler func(view views.View, deltaTime int64)
-	inputHandler  func(ev *tcell.EventKey)
+	events    chan tcell.Event
+	quit      chan struct{}
+	drawables chan Drawable
 }
 
 func CreateRenderContext() (*RenderContext, error) {
-	s, err := tcell.NewScreen()
+	screen, sErr := tcell.NewScreen()
 
-	if err != nil {
-		log.Fatal(err)
-		return nil, err
+	if sErr != nil {
+		log.Fatalf("%~v", sErr)
 	}
 
 	stopScreen := func() {
-		s.Fini()
+		screen.Fini()
 	}
 
-	if err := s.Init(); err != nil {
+	if err := screen.Init(); err != nil {
 		stopScreen()
 		log.Fatal(err)
 		return nil, err
 	}
 
-	width, height := s.Size()
+	width, height := screen.Size()
 
 	if width < TERMINAL_SIZE_WIDTH || height < TERMINAL_SIZE_HEIGHT {
 		stopScreen()
@@ -63,27 +75,25 @@ func CreateRenderContext() (*RenderContext, error) {
 	}
 
 	view := views.NewViewPort(
-		s,
+		screen,
 		(width/2)-(TERMINAL_SIZE_WIDTH/2),
 		(height/2)-(TERMINAL_SIZE_HEIGHT/2),
 		TERMINAL_SIZE_WIDTH,
 		TERMINAL_SIZE_HEIGHT,
 	)
 
-	defStyle := tcell.StyleDefault.Background(DEFAULT_STYLE_BACKGROUND).Foreground(DEFAULT_STYLE_FOREGROUND)
-
 	events := make(chan tcell.Event)
 	quit := make(chan struct{})
 
-	go s.ChannelEvents(events, quit)
+	go screen.ChannelEvents(events, quit)
 
 	context := new(RenderContext)
 
-	context.screen = s
-	context.defaultStyle = defStyle
+	context.screen = screen
 	context.events = events
 	context.quit = quit
 	context.view = view
+	context.drawables = make(chan Drawable)
 
 	return context, nil
 }
@@ -92,12 +102,31 @@ func (c *RenderContext) Stop() {
 	c.screen.Fini()
 }
 
-func (c *RenderContext) HandleRender(renderHandler func(view views.View, deltaTime int64)) {
-	c.renderHandler = renderHandler
+func (c *RenderContext) CollectInputEvents() []*tcell.EventKey {
+	events := make([]tcell.Event, len(c.events))
+
+	select {
+	case e := <-c.events:
+		events = append(events, e)
+	default:
+	}
+
+	inputEvents := make([]*tcell.EventKey, 0, len(events))
+
+	for _, e := range events {
+		switch ev := e.(type) {
+		case *tcell.EventKey:
+			inputEvents = append(inputEvents, ev)
+		case *tcell.EventResize:
+			c.onResize(ev)
+		}
+	}
+
+	return inputEvents
 }
 
-func (c *RenderContext) HandleInput(inputHandler func(ev *tcell.EventKey)) {
-	c.inputHandler = inputHandler
+func (c *RenderContext) DrawableQueue() chan Drawable {
+	return c.drawables
 }
 
 func (c *RenderContext) onResize(ev *tcell.EventResize) {
@@ -115,33 +144,18 @@ func (c *RenderContext) onResize(ev *tcell.EventResize) {
 	c.screen.Sync()
 }
 
-func (c *RenderContext) BeginRendering() {
-	c.lastRenderTime = time.Now()
+func (c *RenderContext) Draw(deltaTime int64, drawables []Drawable) {
+	fps := 1_000_000 / deltaTime
 
-	for {
-		deltaTime := 1 + time.Since(c.lastRenderTime).Microseconds()
-		c.lastRenderTime = time.Now()
+	c.view.Clear()
 
-		c.screen.Clear()
+	fpsText := CreateText(0, 0, 16, 1, fmt.Sprintf("%v FPS", fps), tcell.StyleDefault)
 
-		c.renderHandler(c.view, deltaTime)
-
-		c.screen.Show()
-
-		select {
-		case ev, ok := <-c.events:
-
-			if !ok {
-				break
-			}
-
-			switch ev := ev.(type) {
-			case *tcell.EventResize:
-				c.onResize(ev)
-			case *tcell.EventKey:
-				c.inputHandler(ev)
-			}
-		default:
-		}
+	for _, d := range drawables {
+		d.Draw(c.view)
 	}
+
+	fpsText.Draw(c.view)
+
+	c.screen.Show()
 }

render/text.go

@@ -19,8 +19,8 @@ type Text struct {
 }
 
 func CreateText(
-	x, y uint16,
-	width, height uint16,
+	x, y int,
+	width, height int,
 	content string,
 	style tcell.Style,
 ) *Text {

render/viewport.go

@@ -0,0 +1,96 @@
+package render
+
+import (
+	"mvvasilev/last_light/util"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/gdamore/tcell/v2/views"
+	"github.com/google/uuid"
+)
+
+type Viewport struct {
+	id             uuid.UUID
+	screenLocation util.Position
+
+	viewportCenter util.Position
+	viewportSize   util.Size
+
+	style tcell.Style
+}
+
+func CreateViewport(screenLoc, viewportCenter util.Position, size util.Size, style tcell.Style) *Viewport {
+	v := new(Viewport)
+
+	v.id = uuid.New()
+	v.screenLocation = screenLoc
+	v.viewportCenter = viewportCenter
+	v.viewportSize = size
+	v.style = style
+
+	return v
+}
+
+func (vp *Viewport) UniqueId() uuid.UUID {
+	return vp.id
+}
+
+func (vp *Viewport) Center() util.Position {
+	return vp.viewportCenter
+}
+
+func (vp *Viewport) SetCenter(pos util.Position) {
+	vp.viewportCenter = pos
+}
+
+func (vp *Viewport) Size() util.Size {
+	return vp.viewportSize
+}
+
+func (vp *Viewport) ScreenLocation() util.Position {
+	return vp.screenLocation
+}
+
+func (vp *Viewport) DrawFromProvider(v views.View, provider func(x, y int) rune) {
+	width, height := vp.viewportSize.WH()
+	originX, originY := vp.viewportCenter.WithOffset(-width/2, -height/2).XY()
+	screenX, screenY := vp.screenLocation.XY()
+
+	for h := originY; h < originY+height; h++ {
+		for w := originX; w < originX+width; w++ {
+			v.SetContent(screenX, screenY, provider(w, h), nil, vp.style)
+
+			screenX += 1
+		}
+
+		screenX = 0
+		screenY += 1
+	}
+}
+
+func (vp *Viewport) Draw(v views.View, buffer [][]rune) {
+	width, height := vp.viewportSize.WH()
+	originX, originY := vp.viewportCenter.WithOffset(-width/2, -height/2).XY()
+	screenX, screenY := vp.screenLocation.XY()
+
+	for h := originY; h < originY+height; h++ {
+
+		if h < 0 || h >= len(buffer) {
+			screenY += 1
+			continue
+		}
+
+		for w := originX; w < originX+width; w++ {
+			if w < 0 || w >= len(buffer[h]) {
+				screenX += 1
+				continue
+			}
+
+			v.SetContent(screenX, screenY, buffer[h][w], nil, vp.style)
+
+			screenX += 1
+		}
+
+		screenX = 0
+		screenY += 1
+	}
+}

ui/border_button.go

@@ -41,7 +41,7 @@ func (b *UIBorderedButton) UniqueId() uuid.UUID {
 	return b.id
 }
 
-func (b *UIBorderedButton) MoveTo(x uint16, y uint16) {
+func (b *UIBorderedButton) MoveTo(x int, y int) {
 	panic("not implemented") // TODO: Implement
 }
 

ui/container.go

@@ -33,7 +33,7 @@ type UIContainer struct {
 	elements []UIElement
 }
 
-func CreateUIContainer(x, y uint16, width, height uint16, layout UIContainerLayout) *UIContainer {
+func CreateUIContainer(x, y int, width, height int, layout UIContainerLayout) *UIContainer {
 	container := new(UIContainer)
 
 	container.id = uuid.New()
@@ -57,7 +57,7 @@ func (uic *UIContainer) UniqueId() uuid.UUID {
 	return uic.id
 }
 
-func (uic *UIContainer) MoveTo(x, y uint16) {
+func (uic *UIContainer) MoveTo(x, y int) {
 	uic.position = util.PositionAt(x, y)
 }
 

ui/label.go

@@ -15,7 +15,7 @@ type UILabel struct {
 	text *render.Text
 }
 
-func CreateUILabel(x, y uint16, width, height uint16, content string, style tcell.Style) *UILabel {
+func CreateUILabel(x, y int, width, height int, content string, style tcell.Style) *UILabel {
 	label := new(UILabel)
 
 	label.id = uuid.New()
@@ -24,11 +24,11 @@ func CreateUILabel(x, y uint16, width, height uint16, content string, style tcel
 	return label
 }
 
-func CreateSingleLineUILabel(x, y uint16, content string, style tcell.Style) *UILabel {
+func CreateSingleLineUILabel(x, y int, content string, style tcell.Style) *UILabel {
 	label := new(UILabel)
 
 	label.id = uuid.New()
-	label.text = render.CreateText(x, y, uint16(utf8.RuneCountInString(content)), 1, content, style)
+	label.text = render.CreateText(x, y, int(utf8.RuneCountInString(content)), 1, content, style)
 
 	return label
 }
@@ -37,8 +37,8 @@ func (t *UILabel) UniqueId() uuid.UUID {
 	return t.id
 }
 
-func (t *UILabel) MoveTo(x uint16, y uint16) {
-	t.text = render.CreateText(x, y, uint16(t.text.Size().Width()), uint16(t.Size().Height()), t.text.Content(), t.text.Style())
+func (t *UILabel) MoveTo(x int, y int) {
+	t.text = render.CreateText(x, y, int(t.text.Size().Width()), int(t.Size().Height()), t.text.Content(), t.text.Style())
 }
 
 func (t *UILabel) Position() util.Position {

ui/simple_button.go

@@ -20,11 +20,11 @@ type UISimpleButton struct {
 	highlightedStyle   tcell.Style
 }
 
-func CreateSimpleButton(x, y uint16, text string, unhighlightedStyle, highlightedStyle tcell.Style, onSelect func()) *UISimpleButton {
+func CreateSimpleButton(x, y int, text string, unhighlightedStyle, highlightedStyle tcell.Style, onSelect func()) *UISimpleButton {
 	sb := new(UISimpleButton)
 
 	sb.id = uuid.New()
-	sb.text = render.CreateText(x, y, uint16(utf8.RuneCountInString(text)), 1, text, unhighlightedStyle)
+	sb.text = render.CreateText(x, y, int(utf8.RuneCountInString(text)), 1, text, unhighlightedStyle)
 	sb.isHighlighted = false
 	sb.selectHandler = onSelect
 	sb.highlightedStyle = highlightedStyle
@@ -51,8 +51,8 @@ func (sb *UISimpleButton) Highlight() {
 	newContent := "[ " + sb.text.Content() + " ]"
 
 	sb.text = render.CreateText(
-		uint16(sb.Position().X()-2), uint16(sb.Position().Y()),
-		uint16(utf8.RuneCountInString(newContent)), 1,
+		int(sb.Position().X()-2), int(sb.Position().Y()),
+		int(utf8.RuneCountInString(newContent)), 1,
 		newContent,
 		sb.highlightedStyle,
 	)
@@ -66,8 +66,8 @@ func (sb *UISimpleButton) Unhighlight() {
 	contentLen := utf8.RuneCountInString(content)
 
 	sb.text = render.CreateText(
-		uint16(sb.Position().X()+2), uint16(sb.Position().Y()),
-		uint16(contentLen), 1,
+		int(sb.Position().X()+2), int(sb.Position().Y()),
+		int(contentLen), 1,
 		content,
 		sb.unhighlightedStyle,
 	)
@@ -81,8 +81,8 @@ func (sb *UISimpleButton) UniqueId() uuid.UUID {
 	return sb.id
 }
 
-func (sb *UISimpleButton) MoveTo(x uint16, y uint16) {
-	sb.text = render.CreateText(x, y, uint16(utf8.RuneCountInString(sb.text.Content())), 1, sb.text.Content(), sb.highlightedStyle)
+func (sb *UISimpleButton) MoveTo(x int, y int) {
+	sb.text = render.CreateText(x, y, int(utf8.RuneCountInString(sb.text.Content())), 1, sb.text.Content(), sb.highlightedStyle)
 }
 
 func (sb *UISimpleButton) Position() util.Position {

ui/ui.go

@@ -1,20 +1,19 @@
 package ui
 
 import (
+	"mvvasilev/last_light/render"
 	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
-	"github.com/gdamore/tcell/v2/views"
-	"github.com/google/uuid"
 )
 
 type UIElement interface {
-	UniqueId() uuid.UUID
-	MoveTo(x, y uint16)
+	MoveTo(x, y int)
 	Position() util.Position
 	Size() util.Size
-	Draw(v views.View)
 	Input(e *tcell.EventKey)
+
+	render.Drawable
 }
 
 type UIHighlightableElement interface {

ui/window.go

@@ -17,14 +17,14 @@ type UIWindow struct {
 	box   render.Rectangle
 }
 
-func CreateWindow(x, y, width, height uint16, title string, style tcell.Style) *UIWindow {
+func CreateWindow(x, y, width, height int, title string, style tcell.Style) *UIWindow {
 	w := new(UIWindow)
 
 	titleLen := utf8.RuneCountInString(title)
 
-	titlePos := (width / 2) - uint16(titleLen/2)
+	titlePos := (width / 2) - int(titleLen/2)
 
-	w.title = render.CreateText(x+titlePos, y, uint16(titleLen), 1, title, style)
+	w.title = render.CreateText(x+titlePos, y, int(titleLen), 1, title, style)
 
 	w.box = render.CreateRectangle(
 		x, y, width, height,
@@ -41,7 +41,7 @@ func (w *UIWindow) UniqueId() uuid.UUID {
 	return w.id
 }
 
-func (w *UIWindow) MoveTo(x uint16, y uint16) {
+func (w *UIWindow) MoveTo(x int, y int) {
 
 }
 

util/util.go

@@ -5,7 +5,7 @@ type Position struct {
 	y int
 }
 
-func PositionAt(x uint16, y uint16) Position {
+func PositionAt(x int, y int) Position {
 	return Position{int(x), int(y)}
 }
 
@@ -21,8 +21,10 @@ func (p Position) XY() (int, int) {
 	return p.x, p.y
 }
 
-func (p Position) XYUint16() (uint16, uint16) {
-	return uint16(p.x), uint16(p.y)
+func (p Position) WithOffset(xOffset int, yOffset int) Position {
+	p.x = p.x + xOffset
+	p.y = p.y + yOffset
+	return p
 }
 
 type Size struct {
@@ -30,10 +32,14 @@ type Size struct {
 	height int
 }
 
-func SizeOf(width uint16, height uint16) Size {
+func SizeOf(width int, height int) Size {
 	return Size{int(width), int(height)}
 }
 
+func SizeOfInt(width int, height int) Size {
+	return Size{width, height}
+}
+
 func (s Size) Width() int {
 	return s.width
 }
@@ -42,8 +48,8 @@ func (s Size) Height() int {
 	return s.height
 }
 
-func (s Size) WHUint16() (uint16, uint16) {
-	return uint16(s.width), uint16(s.height)
+func (s Size) WH() (int, int) {
+	return s.width, s.height
 }
 
 func LimitIncrement(i int, limit int) int {