more zoom/center fixes. RLEs now load centered and visible.

bugs though

TODO.md

@@ -1,16 +1,17 @@
 - add all other options like size etc
 
-- Clear screen problem:
-  - it works when hitting the K key, immediately
-  - its being turned off correctly when entering menu and on when leaving it
-  - but  regardless of the setting,  after turning it off,  the engine
-    seems to run a couple of  ticks with the old setting before switching
-    scenes
-  - looks like a race condition
-  - obviously  with K there  are more loops before  actually switching
-    scenes, which doesn't happen with ESC
-    
-    
-- if grid lines is disabled, they appear anyway in the first frame (then disappear)
-
 - changing options mid-game has no effect in most cases, even after a restart
+
+- Statefile loading does not work correclty anymore. With larger grids
+  everything  is empty.  With square  grids part  of the  grid is  cut
+  off. Smaller grids load though
+  
+- Also  when loading a state  file, centering doesn't work  anymore, I
+  think the geom calculation is overthrown by the parser func. So, put
+  this calc into its own func and  always call. Or - as stated below -
+  put it onto camera.go and call from Init().
+  
+- Zoom 0 on reset only  works when world<screen.  otherwise zoom would
+  be negative So, on Init() memoize  centered camera position or add a
+  Center() function  to camera.go.  Then on  reset calculate  the zoom
+  level so that the world fits into the screen.

config.go

@@ -3,12 +3,12 @@ package main
 import (
 	"errors"
 	"fmt"
+	"math"
 	"os"
 	"runtime/pprof"
 	"strconv"
 	"strings"
 
-	"github.com/alecthomas/repr"
 	"github.com/spf13/pflag"
 	"github.com/tlinden/golsky/rle"
 )
@@ -30,6 +30,8 @@ type Config struct {
 	Restart, RestartGrid, RestartCache     bool
 	StartWithMenu                          bool
 	Zoomfactor                             int
+	InitialCamPos                          []float64
+	DelayedStart                           bool // if true game, we wait. like pause but program induced
 
 	// for internal profiling
 	ProfileFile     string
@@ -38,26 +40,19 @@ type Config struct {
 }
 
 const (
-	VERSION = "v0.0.7"
+	VERSION = "v0.0.8"
 	Alive   = 1
 	Dead    = 0
 
-	DEFAULT_WIDTH      = 600
+	DEFAULT_GRID_WIDTH  = 600
-	DEFAULT_HEIGHT     = 400
+	DEFAULT_GRID_HEIGHT = 400
 	DEFAULT_CELLSIZE    = 4
-	DEFAULT_ZOOMFACTOR = 150 // FIXME, doesn't work?
+	DEFAULT_ZOOMFACTOR  = 150
 	DEFAULT_GEOM        = "640x384"
 )
 
 // parse given window geometry and adjust game settings according to it
 func (config *Config) ParseGeom(geom string) error {
-	if geom == "" {
-		config.ScreenWidth = config.Cellsize * config.Width
-		config.ScreenHeight = config.Cellsize * config.Height
-		config.Zoomfactor = 0
-		return nil
-	}
-
 	// force a geom
 	geometry := strings.Split(geom, "x")
 	if len(geometry) != 2 {
@@ -74,25 +69,27 @@ func (config *Config) ParseGeom(geom string) error {
 		return errors.New("failed to parse height, expecting integer")
 	}
 
-	/*
-		// adjust dimensions, account for  grid width+height so that cells
-		// fit into window
-		config.ScreenWidth = width - (width % config.Width)
-		config.ScreenHeight = height - (height % config.Height)
-
-		if config.ScreenWidth == 0 || config.ScreenHeight == 0 {
-			return errors.New("the number of requested cells don't fit into the requested window size")
-		}
-	*/
-
 	config.ScreenWidth = width
 	config.ScreenHeight = height
 
-	//config.Cellsize = config.ScreenWidth / config.Width
 	config.Cellsize = DEFAULT_CELLSIZE
 	config.Zoomfactor = DEFAULT_ZOOMFACTOR
 
-	repr.Println(config)
+	// calculate the initial cam pos. It is negative if the total grid
+	// size  is smaller than  the screen  in a centered  position, but
+	// it's zero if it's equal or larger than the screen.
+	config.InitialCamPos = make([]float64, 2)
+
+	config.InitialCamPos[0] = float64(((config.ScreenWidth - (config.Width * config.Cellsize)) / 2) * -1)
+	if config.Width*config.Cellsize >= config.ScreenWidth {
+		// must be positive if world wider than screen
+		config.InitialCamPos[0] = math.Abs(config.InitialCamPos[0])
+	}
+
+	if config.Height*config.Cellsize > config.ScreenHeight {
+		config.InitialCamPos[1] = math.Abs(float64(((config.ScreenHeight - (config.Height * config.Cellsize)) / 2)))
+	}
+
 	return nil
 }
 
@@ -121,6 +118,9 @@ func (config *Config) ParseRLE(rlefile string) error {
 		config.Cellsize = config.ScreenWidth / config.Width
 	}
 
+	fmt.Printf("width: %d, screenwidth: %d, rlewidth: %d, cellsize: %d\n",
+		config.Width, config.ScreenWidth, config.RLE.Width, config.Cellsize)
+
 	// RLE needs an empty grid
 	config.Empty = true
 
@@ -133,7 +133,7 @@ func (config *Config) ParseRLE(rlefile string) error {
 }
 
 // parse a state file, if given, and adjust game settings accordingly
-func (config *Config) ParseStatefile(statefile string) error {
+func (config *Config) ParseStatefile() error {
 	if config.Statefile == "" {
 		return nil
 	}
@@ -175,8 +175,8 @@ func ParseCommandline() (*Config, error) {
 	)
 
 	// commandline params, most configure directly config flags
-	pflag.IntVarP(&config.Width, "width", "W", DEFAULT_WIDTH, "grid width in cells")
+	pflag.IntVarP(&config.Width, "width", "W", DEFAULT_GRID_WIDTH, "grid width in cells")
-	pflag.IntVarP(&config.Height, "height", "H", DEFAULT_HEIGHT, "grid height in cells")
+	pflag.IntVarP(&config.Height, "height", "H", DEFAULT_GRID_HEIGHT, "grid height in cells")
 	pflag.IntVarP(&config.Cellsize, "cellsize", "c", 8, "cell size in pixels")
 	pflag.StringVarP(&geom, "geom", "G", DEFAULT_GEOM, "window geometry in WxH in pixels, overturns -c")
 
@@ -191,7 +191,7 @@ func ParseCommandline() (*Config, error) {
 	pflag.BoolVarP(&config.ShowVersion, "version", "v", false, "show version")
 	pflag.BoolVarP(&config.Paused, "paused", "p", false, "do not start simulation (use space to start)")
 	pflag.BoolVarP(&config.Debug, "debug", "d", false, "show debug info")
-	pflag.BoolVarP(&config.ShowGrid, "show-grid", "g", true, "draw grid lines")
+	pflag.BoolVarP(&config.ShowGrid, "show-grid", "g", false, "draw grid lines")
 	pflag.BoolVarP(&config.Empty, "empty", "e", false, "start with an empty screen")
 	pflag.BoolVarP(&config.Invert, "invert", "i", false, "invert colors (dead cell: black)")
 	pflag.BoolVarP(&config.ShowEvolution, "show-evolution", "s", false, "show evolution traces")
@@ -214,12 +214,18 @@ func ParseCommandline() (*Config, error) {
 		return nil, err
 	}
 
+	err = config.ParseStatefile()
+	if err != nil {
+		return nil, err
+	}
+
 	// load  rule from commandline  when no  rule came from  RLE file,
 	// default is B3/S23, aka conways game of life
 	if config.Rule == nil {
 		config.Rule = ParseGameRule(rule)
 	}
 
+	//repr.Println(config)
 	return &config, nil
 }
 

game.go

@@ -1,8 +1,6 @@
 package main
 
 import (
-	"fmt"
-
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
@@ -53,26 +51,29 @@ func (game *Game) Update() error {
 	scene := game.GetCurrentScene()
 	scene.Update()
 
-	fmt.Printf("Clear Screen: %t\n", ebiten.IsScreenClearedEveryFrame())
+	next := scene.GetNext()
+	if next != game.CurrentScene {
+		scene.ResetNext()
+		game.CurrentScene = next
+	}
 
 	return nil
 }
 
 func (game *Game) Draw(screen *ebiten.Image) {
-	var nextscene Scene
+	// first draw primary scene[s], although there are only 1
-	scene := game.GetCurrentScene()
+	for current, scene := range game.Scenes {
-
+		if scene.IsPrimary() {
-	next := scene.GetNext()
+			// primary scenes always draw
-	if next != game.CurrentScene {
-		scene.ResetNext()
-		game.CurrentScene = next
-		nextscene = game.GetCurrentScene()
-		ebiten.SetScreenClearedEveryFrame(nextscene.Clearscreen())
-	}
-
 			scene.Draw(screen)
 
-	if nextscene != nil {
+			if current == game.CurrentScene {
-		nextscene.Draw(screen)
+				// avoid to redraw it in the next step
+				return
 			}
 		}
+	}
+
+	scene := game.GetCurrentScene()
+	scene.Draw(screen)
+}

grid.go

@@ -78,6 +78,19 @@ func (grid *Grid) FillRandom() {
 	}
 }
 
+func (grid *Grid) Dump() {
+	for y := 0; y < grid.Height; y++ {
+		for x := 0; x < grid.Width; x++ {
+			if grid.Data[y][x] == 1 {
+				fmt.Print("XX")
+			} else {
+				fmt.Print("  ")
+			}
+		}
+		fmt.Println()
+	}
+}
+
 // initialize using a given RLE pattern
 func (grid *Grid) LoadRLE(pattern *rle.RLE) {
 	if pattern != nil {
@@ -95,6 +108,8 @@ func (grid *Grid) LoadRLE(pattern *rle.RLE) {
 				}
 			}
 		}
+
+		//grid.Dump()
 	}
 }
 

main.go

@@ -12,11 +12,12 @@ import (
 )
 
 func main() {
-	dau := true
+	var directstart bool
 
 	if len(os.Args) > 1 {
-		dau = false
+		directstart = true
 	}
+
 	config, err := ParseCommandline()
 	if err != nil {
 		log.Fatal(err)
@@ -28,8 +29,9 @@ func main() {
 	}
 
 	start := Play
-	if dau {
+	if !directstart {
 		start = Menu
+		config.DelayedStart = true
 	}
 	game := NewGame(config, SceneName(start))
 

scene-menu.go

@@ -46,14 +46,11 @@ func (scene *SceneMenu) SetNext(next SceneName) {
 	scene.Next = next
 }
 
-func (scene *SceneMenu) Clearscreen() bool {
-	return false
-}
-
 func (scene *SceneMenu) Update() error {
 	scene.Ui.Update()
 
 	if inpututil.IsKeyJustPressed(ebiten.KeyEscape) || inpututil.IsKeyJustPressed(ebiten.KeyQ) {
+		scene.Config.DelayedStart = false
 		scene.Leave()
 	}
 
@@ -61,6 +58,10 @@ func (scene *SceneMenu) Update() error {
 
 }
 
+func (scene *SceneMenu) IsPrimary() bool {
+	return false
+}
+
 func (scene *SceneMenu) Draw(screen *ebiten.Image) {
 	scene.Ui.Draw(screen)
 }
@@ -102,7 +103,7 @@ func (scene *SceneMenu) Init() {
 	separator2 := NewSeparator()
 	separator3 := NewSeparator()
 
-	cancel := NewMenuButton("Close Window",
+	cancel := NewMenuButton("Back",
 		func(args *widget.ButtonClickedEventArgs) {
 			scene.Leave()
 		})

scene-options.go

@@ -44,7 +44,7 @@ func (scene *SceneOptions) SetNext(next SceneName) {
 	scene.Next = next
 }
 
-func (scene *SceneOptions) Clearscreen() bool {
+func (scene *SceneOptions) IsPrimary() bool {
 	return false
 }
 

scene-play.go

@@ -18,6 +18,10 @@ type Images struct {
 	Black, White, Age1, Age2, Age3, Age4, Old *ebiten.Image
 }
 
+const (
+	DEBUG_FORMAT = "FPS: %0.2f, TPG: %d, M: %0.2fMB, Generations: %d\nScale: %.02f, Zoom: %d, Cam: %.02f,%.02f Cursor: %d,%d  %s"
+)
+
 type ScenePlay struct {
 	Game   *Game
 	Config *Config
@@ -61,6 +65,10 @@ func NewPlayScene(game *Game, config *Config) Scene {
 	return scene
 }
 
+func (scene *ScenePlay) IsPrimary() bool {
+	return true
+}
+
 func (scene *ScenePlay) GetNext() SceneName {
 	return scene.Next
 }
@@ -73,10 +81,6 @@ func (scene *ScenePlay) SetNext(next SceneName) {
 	scene.Next = next
 }
 
-func (scene *ScenePlay) Clearscreen() bool {
-	return true
-}
-
 func (scene *ScenePlay) CheckRule(state int64, neighbors int64) int64 {
 	var nextstate int64
 
@@ -366,7 +370,8 @@ func (scene *ScenePlay) SaveRectRLE() {
 func (scene *ScenePlay) Update() error {
 	if scene.Config.Restart {
 		scene.Config.Restart = false
-		scene.Init()
+		scene.InitGrid(nil)
+		scene.InitCache()
 		return nil
 	}
 
@@ -395,7 +400,7 @@ func (scene *ScenePlay) ToggleCellOnCursorPos(alive int64) {
 	x := int(worldX) / scene.Config.Cellsize
 	y := int(worldY) / scene.Config.Cellsize
 
-	if x > -1 && y > -1 {
+	if x > -1 && y > -1 && x < scene.Config.Width && y < scene.Config.Height {
 		scene.Grids[scene.Index].Data[y][x] = alive
 		scene.History.Data[y][x] = 1
 	}
@@ -484,10 +489,14 @@ func (scene *ScenePlay) DrawDebug(screen *ebiten.Image) {
 			paused = "-- paused --"
 		}
 
+		x, y := ebiten.CursorPosition()
 		debug := fmt.Sprintf(
-			"FPS: %0.2f, TPG: %d, Mem: %0.2fMB, Gen: %d, Scale: %.02f, Z: %d, Clear: %t  %s",
+			DEBUG_FORMAT,
 			ebiten.ActualTPS(), scene.TPG, GetMem(), scene.Generations,
-			scene.Game.Scale, scene.Camera.ZoomFactor, ebiten.IsScreenClearedEveryFrame(), paused)
+			scene.Game.Scale, scene.Camera.ZoomFactor,
+			scene.Camera.Position[0], scene.Camera.Position[1],
+			x, y,
+			paused)
 
 		FontRenderer.Renderer.SetSizePx(10 + int(scene.Game.Scale*10))
 		FontRenderer.Renderer.SetTarget(screen)
@@ -500,6 +509,7 @@ func (scene *ScenePlay) DrawDebug(screen *ebiten.Image) {
 
 		fmt.Println(debug)
 	}
+
 }
 
 // load a pre-computed pattern from RLE file
@@ -549,6 +559,7 @@ func (scene *ScenePlay) InitGrid(grid *Grid) {
 	gridb := NewGrid(scene.Config.Width, scene.Config.Height, scene.Config.Density, scene.Config.Empty)
 	history := NewGrid(scene.Config.Width, scene.Config.Height, scene.Config.Density, scene.Config.Empty)
 
+	// startup is delayed until user has selected options
 	grida.FillRandom()
 	grida.Copy(history)
 
@@ -607,7 +618,6 @@ func (scene *ScenePlay) Init() {
 
 	if scene.Config.StateGrid != nil {
 		grid = scene.Config.StateGrid
-
 	}
 
 	scene.Camera = Camera{
@@ -617,12 +627,27 @@ func (scene *ScenePlay) Init() {
 		},
 	}
 
-	scene.World = ebiten.NewImage(scene.Config.ScreenWidth, scene.Config.ScreenHeight)
+	scene.World = ebiten.NewImage(
-	scene.Cache = ebiten.NewImage(scene.Config.ScreenWidth, scene.Config.ScreenHeight)
+		scene.Config.Width*scene.Config.Cellsize,
+		scene.Config.Height*scene.Config.Cellsize,
+	)
+
+	scene.Cache = ebiten.NewImage(
+		scene.Config.Width*scene.Config.Cellsize,
+		scene.Config.Height*scene.Config.Cellsize,
+	)
 
 	scene.InitTiles()
 	scene.InitCache()
+
+	if scene.Config.DelayedStart && !scene.Config.Empty {
+		scene.Config.Empty = true
 		scene.InitGrid(grid)
+		scene.Config.Empty = false
+	} else {
+		scene.InitGrid(grid)
+	}
+
 	scene.InitPattern()
 
 	scene.Index = 0
@@ -633,6 +658,9 @@ func (scene *ScenePlay) Init() {
 	if scene.Config.Zoomfactor < 0 || scene.Config.Zoomfactor > 0 {
 		scene.Camera.ZoomFactor = scene.Config.Zoomfactor
 	}
+
+	scene.Camera.Position[0] = scene.Config.InitialCamPos[0]
+	scene.Camera.Position[1] = scene.Config.InitialCamPos[1]
 }
 
 // count the living neighbors of a cell

scene.go

@@ -14,9 +14,9 @@ type Scene interface {
 	SetNext(SceneName)
 	GetNext() SceneName
 	ResetNext()
-	Clearscreen() bool
 	Update() error
 	Draw(screen *ebiten.Image)
+	IsPrimary() bool // if true, this scene will be always drawn
 }
 
 const (

widgets.go

@@ -69,23 +69,12 @@ func NewSeparator() widget.PreferredSizeLocateableWidget {
 		widget.ContainerOpts.Layout(widget.NewRowLayout(
 			widget.RowLayoutOpts.Direction(widget.DirectionVertical),
 			widget.RowLayoutOpts.Padding(widget.Insets{
-				Top:    20,
+				Top:    3,
-				Bottom: 20,
+				Bottom: 0,
 			}))),
 		widget.ContainerOpts.WidgetOpts(
 			widget.WidgetOpts.LayoutData(
 				widget.RowLayoutData{Stretch: true})))
-
-	c.AddChild(widget.NewGraphic(
-		widget.GraphicOpts.WidgetOpts(widget.WidgetOpts.LayoutData(widget.RowLayoutData{
-			Stretch:   true,
-			MaxHeight: 2,
-		})),
-		widget.GraphicOpts.ImageNineSlice(
-			image.NewNineSliceColor(
-				color.NRGBA{0xdf, 0xf4, 0xff, 0xff})),
-	))
-
 	return c
 }
 
@@ -125,7 +114,7 @@ func NewRowContainer(title string) *RowContainer {
 		),
 		widget.ContainerOpts.Layout(widget.NewRowLayout(
 			widget.RowLayoutOpts.Direction(widget.DirectionVertical),
-			widget.RowLayoutOpts.Padding(widget.NewInsetsSimple(20)),
+			widget.RowLayoutOpts.Padding(widget.NewInsetsSimple(8)),
 			widget.RowLayoutOpts.Spacing(0),
 		)),
 		widget.ContainerOpts.BackgroundImage(buttonImageHover),