Rename view-map to minimap and work on a real view-map

.gitignore

@@ -2,4 +2,5 @@
 /loader
 /orig
 /view-map
+/view-minimap
 /view-set

Makefile

@@ -1,17 +1,21 @@
 srcfiles = $(shell find . -iname *.go)
 
-all: loader view-map
+all: loader view-map view-minimap view-set
 
 loader: $(srcfiles)
 	go build -o loader ur.gs/chaos-gate/cmd/loader
 
+
 view-map: $(srcfiles)
 	go build -o view-map ur.gs/chaos-gate/cmd/view-map
 
+view-minimap: $(srcfiles)
+	go build -o view-minimap ur.gs/chaos-gate/cmd/view-minimap
+
 view-set: $(srcfiles)
 	go build -o view-set ur.gs/chaos-gate/cmd/view-set
 
 clean:
-	rm -f loader view-map view-set
+	rm -f loader view-map view-minimap view-set
 
 .PHONY: all clean

cmd/view-map/main.go

@@ -6,13 +6,13 @@ import (
 	"math"
 	"os"
 	"path/filepath"
-	"time"
 
 	"github.com/faiface/pixel"
-	"github.com/faiface/pixel/imdraw"
 	"github.com/faiface/pixel/pixelgl"
 	"golang.org/x/image/colornames"
 
+	"ur.gs/chaos-gate/internal/conv"
+	"ur.gs/chaos-gate/internal/data"
 	"ur.gs/chaos-gate/internal/maps"
 	"ur.gs/chaos-gate/internal/sets"
 	"ur.gs/chaos-gate/internal/ui"
@@ -27,13 +27,13 @@ var (
 type env struct {
 	gameMap *maps.GameMap
 	set     *sets.MapSet
+	objects map[string]*conv.Object
 }
 
-type runState struct {
+type state struct {
 	env *env
 
-	autoUpdate bool
+	step int
-	started    time.Time
 
 	cam    pixel.Matrix
 	camPos pixel.Vec
@@ -41,7 +41,6 @@ type runState struct {
 	zoom float64
 
 	zIdx int
-	cellIdx int
 }
 
 func main() {
@@ -64,7 +63,19 @@ func main() {
 		log.Fatalf("Couldn't load set file %s: %v", setFile, err)
 	}
 
-	env := &env{gameMap: gameMap, set: mapSet}
+	objects := make(map[string]*conv.Object)
+
+	for _, name := range mapSet.Palette {
+		objFile := filepath.Join(*gamePath, "Obj", name+".obj")
+		obj, err := data.LoadObject(objFile)
+		if err != nil {
+			log.Fatalf("Failed to load %s: %v", name, err)
+		}
+
+		objects[name] = conv.ConvertObject(obj, name)
+	}
+
+	env := &env{gameMap: gameMap, set: mapSet, objects: objects}
 
 	// The main thread now belongs to pixelgl
 	pixelgl.Run(env.run)
@@ -77,202 +88,138 @@ func (e *env) run() {
 	}
 
 	pWin := win.PixelWindow
-	state := &runState{
+	state := &state{
 		env: e,
-		autoUpdate: true,
+		//		camPos: pixel.V(0, float64(-pWin.Bounds().Size().Y)),
-		camPos:     pixel.V(0, float64(-pWin.Bounds().Size().Y)),
+		//		camPos: pixel.V(float64(3700), float64(0)),
-		zoom:       8.0,
+		zoom: 1.0,
 	}
 
 	win.Run(func() {
 		oldState := *state
-		state = runStep(pWin, state)
+		state = state.runStep(pWin)
 
-		if oldState != *state {
+		if oldState != *state || oldState.step == 0 {
-			log.Printf("z=%d cellIdx=%d", state.zIdx, state.cellIdx)
+			log.Printf("zoom=%.2f zIdx=%v camPos=%#v", state.zoom, state.zIdx, state.camPos)
-			present(pWin, state)
+			state.present(pWin)
 		}
+
+		state.step += 1
 	})
 }
 
-// Converts pixel coordinates to cell coordinates
+func (e *env) getSprite(palette []string, ref maps.ObjRef) (*conv.Sprite, *conv.Object) {
-func vecToCell(vec pixel.Vec) (int, int) {
+	name := palette[ref.Index()]
-	x := int(vec.X)
+	obj := e.objects[name]
-	y := int(vec.Y)
+	if obj == nil {
-
+		log.Printf("Failed to find surface sprite %#v -> %q", ref, name)
-	if x < 0 {
+		return nil, nil
-		x = 0
 	}
 
-	if x > maps.MaxWidth-1 {
+	if ref.Frame() >= len(obj.Sprites) {
-		x = maps.MaxWidth - 1
+		log.Printf("Out-of-index sprite %v requested for %v", ref.Frame(), name)
+		return nil, obj
 	}
 
-	if y < 0 {
+	return &obj.Sprites[ref.Frame()], obj
-		y = 0
 }
 
-	if y > maps.MaxLength-1 {
+var (
-		y = maps.MaxLength - 1
+	cellWidth  = 128 // I think, anyway
-	}
+	cellHeight = 64
-
-	return x, y
-}
-
-func cellToVec(x, y int) pixel.Rect {
-	min := pixel.Vec{X: float64(x), Y: float64(y)}
-	max := pixel.Vec{X: min.X + 1, Y: min.Y + 1}
-	return pixel.Rect{Min: min, Max: max}
-}
-
-func present(win *pixelgl.Window, state *runState) {
-	gameMap := state.env.gameMap
-	imd := imdraw.New(nil)
-
-	for y := gameMap.MinLength; y < gameMap.MaxLength; y++ {
-		for x := gameMap.MinWidth; x < gameMap.MaxWidth; x++ {
-			rect := cellToVec(int(x), int(y))
-			cell := gameMap.Cells.At(int(x), int(y), int(state.zIdx))
-
-			// TODO: represent the state of the cell *sensibly*, using colour.
-			// Need to understand the contents better first, so for now optimize
-			// for exploration
-			imd.Color = makeColour(&cell, state.cellIdx)
-			imd.Push(rect.Min, rect.Max)
-			imd.Rectangle(0.0)
-		}
-	}
-
-	// Draw the boundary
-	rect := pixel.R(
-		float64(gameMap.MinWidth)-0.5, float64(gameMap.MinLength)-0.5,
-		float64(gameMap.MaxWidth)+0.5, float64(gameMap.MaxLength)+0.5,
 )
 
-	imd.Color = pixel.RGB(255, 0, 0)
+// TODO: build all the sprites in the set into a single spritesheet so we can
-	imd.EndShape = imdraw.SharpEndShape
+// use pixel.Batch
-	imd.Push(rect.Min, rect.Max)
+func (s *state) present(pWin *pixelgl.Window) {
-	imd.Rectangle(1.0)
+	gameMap := s.env.gameMap
 
-	center := win.Bounds().Center()
+	pWin.Clear(colornames.Black)
+
+	center := pWin.Bounds().Center()
 
 	cam := pixel.IM
-	cam = cam.ScaledXY(pixel.ZV, pixel.Vec{1.0, -1.0})  // invert the Y axis
+	//	cam = cam.ScaledXY(center, pixel.Vec{1.0, -1.0}) // invert the Y axis
-	cam = cam.Scaled(pixel.ZV, state.zoom)              // apply current zoom factor
+	cam = cam.Scaled(pixel.ZV, s.zoom)    // apply current zoom factor
-	cam = cam.Moved(center.Sub(state.camPos))           // Make it central
+	cam = cam.Moved(center.Sub(s.camPos)) // Make it central
-	cam = cam.Rotated(center.Sub(state.camPos), -0.785) // Apply isometric angle
+	//	cam = cam.Rotated(center.Sub(s.camPos), -0.785) // Apply isometric angle
-	state.cam = cam
+	s.cam = cam
+	pWin.SetMatrix(s.cam)
 
-	win.SetMatrix(state.cam)
+	// TODO: bounds clipping
-	win.Clear(colornames.Black)
+	z := int(s.zIdx)
-	imd.Draw(win)
+	for y := int(gameMap.MinLength); y < int(gameMap.MaxLength); y++ {
+		for x := int(gameMap.MinWidth); x < int(gameMap.MaxWidth); x++ {
+
+			cell := gameMap.Cells.At(x, y, z)
+
+			// TODO: optimize drawing, etc
+			surfaceSprite, surfaceObj := s.env.getSprite(s.env.set.SurfacePalette, cell.Surface)
+			if surfaceSprite == nil {
+				log.Printf("no surfaceSprite")
+				continue
 			}
 
-func makeColour(cell *maps.Cell, colIdx int) pixel.RGBA {
+			if surfaceSprite.Width != cellWidth {
-	var scale func(float64) float64
+				log.Printf("WARN: Surface sprite has wrong width: %v", surfaceSprite.Width)
-
-	mult := func(factor float64) func(float64) float64 {
-		return func(in float64) float64 { return in * factor }
 			}
 
-	// Different columns do better with different levels of greyscale.
+			yPos := (y - int(gameMap.MinLength)) * cellHeight
+			xPos := (x - int(gameMap.MinWidth)) * cellWidth
 
-	switch colIdx {
+			// Tiles should be flush to each other. Offset odd-numbered tiles up
-	case 0:
+			// and right to get the effect
-		scale = mult(0.004)
+			if y%2 == 1 {
-	case 1:
+				yPos -= cellHeight * 2
-		scale = mult(0.1)
+				xPos += (cellWidth / 2)
-	case 2:
-		scale = mult(1.0)
-	case 3:
-		scale = mult(0.1)
-	case 4:
-		scale = func(in float64) float64 { return mult(0.01)(in - 100) }
-	case 10:
-		scale = func(in float64) float64 { return mult(0.01)(in - 100) }
-	case 12:
-		scale = mult(0.004)
-	case 13:
-		scale = mult(0.004)
-	case 14:
-		scale = mult(0.004)
-	case 15:
-		scale = mult(1.0)
-	default:
-		scale = mult(0.01) // close to maximum resolution, low-value fields will be lost
 			}
 
-	col := scale(float64(cell.At(colIdx)))
+			pic := surfaceSprite.Pic
-	return pixel.RGB(col, col, col)
+			spr := pixel.NewSprite(pic, pic.Bounds())
+			log.Printf(
+				"cell(%v,%v,%v): %s %d: pix(%v,%v - %v,%v)",
+				x, y, z, surfaceObj.Name, cell.Surface.Index(),
+				xPos, yPos, xPos+surfaceSprite.Width, yPos+surfaceSprite.Height,
+			)
+			spr.Draw(pWin, pixel.IM.Moved(pixel.V(float64(xPos), float64(yPos))))
 		}
-
-func runStep(win *pixelgl.Window, state *runState) *runState {
-	nextState := *state
-
-	// Enable / disable auto-update with the enter key
-	if win.JustPressed(pixelgl.KeyEnter) {
-		nextState.autoUpdate = !state.autoUpdate
-		log.Printf("autoUpdate=%v", nextState.autoUpdate)
-
-		if nextState.autoUpdate {
-			nextState.started = time.Now()
 	}
 }
 
-	// Automatically cycle every second when auto-update is on
+func (s *state) runStep(pWin *pixelgl.Window) *state {
-	if nextState.autoUpdate && time.Now().Sub(state.started) > 500*time.Millisecond {
+	newState := *s
-		nextState.cellIdx = nextState.cellIdx + 1
+	newState.handleKeys(pWin)
-		if nextState.cellIdx >= maps.CellSize {
+
-			nextState.cellIdx = 0
+	return &newState
-			nextState.zIdx = nextState.zIdx + 1
 }
 
-		if nextState.zIdx >= maps.MaxHeight {
+func (s *state) handleKeys(pWin *pixelgl.Window) {
-			nextState.zIdx = 0
+	if pWin.Pressed(pixelgl.KeyLeft) {
+		s.camPos.X -= 64
 	}
 
-		nextState.started = time.Now()
+	if pWin.Pressed(pixelgl.KeyRight) {
+		s.camPos.X += 64
 	}
 
-	if win.Pressed(pixelgl.KeyLeft) {
+	if pWin.Pressed(pixelgl.KeyDown) {
-		nextState.camPos.X -= 4
+		s.camPos.Y -= 64
 	}
 
-	if win.Pressed(pixelgl.KeyRight) {
+	if pWin.Pressed(pixelgl.KeyUp) {
-		nextState.camPos.X += 4
+		s.camPos.Y += 64
 	}
 
-	if win.Pressed(pixelgl.KeyDown) {
+	for i := 1; i <= 7; i++ {
-		nextState.camPos.Y -= 4
+		if pWin.JustPressed(pixelgl.Key0 + pixelgl.Button(i)) {
-	}
+			s.zIdx = i - 1
-
-	if win.Pressed(pixelgl.KeyUp) {
-		nextState.camPos.Y += 4
-	}
-
-	for i := 0; i <= 6; i++ {
-		if win.JustPressed(pixelgl.Key1 + pixelgl.Button(i)) {
-			nextState.zIdx = i
-		}
-	}
-
-	// Decrease the cell index
-	if win.JustPressed(pixelgl.KeyMinus) {
-		if nextState.cellIdx > 0 {
-			nextState.cellIdx -= 1
-		}
-	}
-
-	// Increase the cell index
-	if win.JustPressed(pixelgl.KeyEqual) {
-		if nextState.cellIdx < maps.CellSize-1 {
-			nextState.cellIdx += 1
 		}
 	}
 
+	/* TODO: restore this
 	// Show details of clicked-on cell in termal
-	if win.JustPressed(pixelgl.MouseButtonLeft) {
+	if pWin.JustPressed(pixelgl.MouseButtonLeft) {
-		vec := state.cam.Unproject(win.MousePosition())
+		vec := s.cam.Unproject(pWin.MousePosition())
 		x, y := vecToCell(vec)
 		log.Printf("%#v -> %d,%d", vec, x, y)
 		cell := state.env.gameMap.Cells.At(x, y, state.zIdx)
@@ -284,12 +231,8 @@ func runStep(win *pixelgl.Window, state *runState) *runState {
 		)
 		log.Printf("CellIdx%d=%d. Full cell data: %#v", state.cellIdx, cell.At(state.cellIdx), cell)
 	}
+	*/
 
 	// Zoom in and out with the mouse wheel
-	nextState.zoom *= math.Pow(1.2, win.MouseScroll().Y)
+	s.zoom *= math.Pow(1.2, pWin.MouseScroll().Y)
-	if nextState.zoom != state.zoom {
-		log.Printf("zoom=%.2f", nextState.zoom)
-	}
-
-	return &nextState
 }

cmd/view-minimap/main.go

@@ -0,0 +1,295 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"math"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/faiface/pixel"
+	"github.com/faiface/pixel/imdraw"
+	"github.com/faiface/pixel/pixelgl"
+	"golang.org/x/image/colornames"
+
+	"ur.gs/chaos-gate/internal/maps"
+	"ur.gs/chaos-gate/internal/sets"
+	"ur.gs/chaos-gate/internal/ui"
+)
+
+var (
+	gamePath = flag.String("game-path", "./orig", "Path to a WH40K: Chaos Gate installation")
+	mapFile  = flag.String("map", "", "Prefix path to a .map file, e.g. ./orig/Maps/Chapter01.MAP")
+	txtFile  = flag.String("txt", "", "Prefix path to a .txt file, e.g. ./orig/Maps/Chapter01.txt")
+)
+
+type env struct {
+	gameMap *maps.GameMap
+	set     *sets.MapSet
+}
+
+type runState struct {
+	env *env
+
+	autoUpdate bool
+	started    time.Time
+
+	cam    pixel.Matrix
+	camPos pixel.Vec
+
+	zoom float64
+
+	zIdx    int
+	cellIdx int
+}
+
+func main() {
+	flag.Parse()
+
+	if *gamePath == "" || *mapFile == "" || *txtFile == "" {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	gameMap, err := maps.LoadGameMapByFiles(*mapFile, *txtFile)
+	if err != nil {
+		log.Fatalf("Couldn't load map file: %v", err)
+	}
+
+	setFile := filepath.Join(*gamePath, "Sets", gameMap.MapSetFilename())
+	log.Println(setFile)
+	mapSet, err := sets.LoadSet(setFile)
+	if err != nil {
+		log.Fatalf("Couldn't load set file %s: %v", setFile, err)
+	}
+
+	env := &env{gameMap: gameMap, set: mapSet}
+
+	// The main thread now belongs to pixelgl
+	pixelgl.Run(env.run)
+}
+
+func (e *env) run() {
+	win, err := ui.NewWindow("View Map " + *mapFile)
+	if err != nil {
+		log.Fatal("Couldn't create window: %v", err)
+	}
+
+	pWin := win.PixelWindow
+	state := &runState{
+		env:        e,
+		autoUpdate: true,
+		camPos:     pixel.V(0, float64(-pWin.Bounds().Size().Y)),
+		zoom:       8.0,
+	}
+
+	win.Run(func() {
+		oldState := *state
+		state = runStep(pWin, state)
+
+		if oldState != *state {
+			log.Printf("z=%d cellIdx=%d", state.zIdx, state.cellIdx)
+			present(pWin, state)
+		}
+	})
+}
+
+// Converts pixel coordinates to cell coordinates
+func vecToCell(vec pixel.Vec) (int, int) {
+	x := int(vec.X)
+	y := int(vec.Y)
+
+	if x < 0 {
+		x = 0
+	}
+
+	if x > maps.MaxWidth-1 {
+		x = maps.MaxWidth - 1
+	}
+
+	if y < 0 {
+		y = 0
+	}
+
+	if y > maps.MaxLength-1 {
+		y = maps.MaxLength - 1
+	}
+
+	return x, y
+}
+
+func cellToVec(x, y int) pixel.Rect {
+	min := pixel.Vec{X: float64(x), Y: float64(y)}
+	max := pixel.Vec{X: min.X + 1, Y: min.Y + 1}
+	return pixel.Rect{Min: min, Max: max}
+}
+
+func present(win *pixelgl.Window, state *runState) {
+	gameMap := state.env.gameMap
+	imd := imdraw.New(nil)
+
+	for y := gameMap.MinLength; y < gameMap.MaxLength; y++ {
+		for x := gameMap.MinWidth; x < gameMap.MaxWidth; x++ {
+			rect := cellToVec(int(x), int(y))
+			cell := gameMap.Cells.At(int(x), int(y), int(state.zIdx))
+
+			// TODO: represent the state of the cell *sensibly*, using colour.
+			// Need to understand the contents better first, so for now optimize
+			// for exploration
+			imd.Color = makeColour(&cell, state.cellIdx)
+			imd.Push(rect.Min, rect.Max)
+			imd.Rectangle(0.0)
+		}
+	}
+
+	// Draw the boundary
+	rect := pixel.R(
+		float64(gameMap.MinWidth)-0.5, float64(gameMap.MinLength)-0.5,
+		float64(gameMap.MaxWidth)+0.5, float64(gameMap.MaxLength)+0.5,
+	)
+
+	imd.Color = pixel.RGB(255, 0, 0)
+	imd.EndShape = imdraw.SharpEndShape
+	imd.Push(rect.Min, rect.Max)
+	imd.Rectangle(1.0)
+
+	center := win.Bounds().Center()
+
+	cam := pixel.IM
+	cam = cam.ScaledXY(pixel.ZV, pixel.Vec{1.0, -1.0})  // invert the Y axis
+	cam = cam.Scaled(pixel.ZV, state.zoom)              // apply current zoom factor
+	cam = cam.Moved(center.Sub(state.camPos))           // Make it central
+	cam = cam.Rotated(center.Sub(state.camPos), -0.785) // Apply isometric angle
+	state.cam = cam
+
+	win.SetMatrix(state.cam)
+	win.Clear(colornames.Black)
+	imd.Draw(win)
+}
+
+func makeColour(cell *maps.Cell, colIdx int) pixel.RGBA {
+	var scale func(float64) float64
+
+	mult := func(factor float64) func(float64) float64 {
+		return func(in float64) float64 { return in * factor }
+	}
+
+	// Different columns do better with different levels of greyscale.
+
+	switch colIdx {
+	case 0:
+		scale = mult(0.004)
+	case 1:
+		scale = mult(0.1)
+	case 2:
+		scale = mult(1.0)
+	case 3:
+		scale = mult(0.1)
+	case 4:
+		scale = func(in float64) float64 { return mult(0.01)(in - 100) }
+	case 10:
+		scale = func(in float64) float64 { return mult(0.01)(in - 100) }
+	case 12:
+		scale = mult(0.004)
+	case 13:
+		scale = mult(0.004)
+	case 14:
+		scale = mult(0.004)
+	case 15:
+		scale = mult(1.0)
+	default:
+		scale = mult(0.01) // close to maximum resolution, low-value fields will be lost
+	}
+
+	col := scale(float64(cell.At(colIdx)))
+	return pixel.RGB(col, col, col)
+}
+
+func runStep(win *pixelgl.Window, state *runState) *runState {
+	nextState := *state
+
+	// Enable / disable auto-update with the enter key
+	if win.JustPressed(pixelgl.KeyEnter) {
+		nextState.autoUpdate = !state.autoUpdate
+		log.Printf("autoUpdate=%v", nextState.autoUpdate)
+
+		if nextState.autoUpdate {
+			nextState.started = time.Now()
+		}
+	}
+
+	// Automatically cycle every second when auto-update is on
+	if nextState.autoUpdate && time.Now().Sub(state.started) > 500*time.Millisecond {
+		nextState.cellIdx = nextState.cellIdx + 1
+		if nextState.cellIdx >= maps.CellSize {
+			nextState.cellIdx = 0
+			nextState.zIdx = nextState.zIdx + 1
+		}
+
+		if nextState.zIdx >= maps.MaxHeight {
+			nextState.zIdx = 0
+		}
+
+		nextState.started = time.Now()
+	}
+
+	if win.Pressed(pixelgl.KeyLeft) {
+		nextState.camPos.X -= 4
+	}
+
+	if win.Pressed(pixelgl.KeyRight) {
+		nextState.camPos.X += 4
+	}
+
+	if win.Pressed(pixelgl.KeyDown) {
+		nextState.camPos.Y -= 4
+	}
+
+	if win.Pressed(pixelgl.KeyUp) {
+		nextState.camPos.Y += 4
+	}
+
+	for i := 0; i <= 6; i++ {
+		if win.JustPressed(pixelgl.Key1 + pixelgl.Button(i)) {
+			nextState.zIdx = i
+		}
+	}
+
+	// Decrease the cell index
+	if win.JustPressed(pixelgl.KeyMinus) {
+		if nextState.cellIdx > 0 {
+			nextState.cellIdx -= 1
+		}
+	}
+
+	// Increase the cell index
+	if win.JustPressed(pixelgl.KeyEqual) {
+		if nextState.cellIdx < maps.CellSize-1 {
+			nextState.cellIdx += 1
+		}
+	}
+
+	// Show details of clicked-on cell in termal
+	if win.JustPressed(pixelgl.MouseButtonLeft) {
+		vec := state.cam.Unproject(win.MousePosition())
+		x, y := vecToCell(vec)
+		log.Printf("%#v -> %d,%d", vec, x, y)
+		cell := state.env.gameMap.Cells.At(x, y, state.zIdx)
+		log.Printf(
+			"x=%d y=%d z=%d SurfaceTile=%d (%s) SurfaceFrame=%d SquadRelated=%d",
+			x, y, state.zIdx,
+			cell.Surface.Index(), state.env.set.SurfacePalette[int(cell.Surface.Index())], cell.Surface.Frame(),
+			cell.SquadRelated,
+		)
+		log.Printf("CellIdx%d=%d. Full cell data: %#v", state.cellIdx, cell.At(state.cellIdx), cell)
+	}
+
+	// Zoom in and out with the mouse wheel
+	nextState.zoom *= math.Pow(1.2, win.MouseScroll().Y)
+	if nextState.zoom != state.zoom {
+		log.Printf("zoom=%.2f", nextState.zoom)
+	}
+
+	return &nextState
+}

cmd/view-set/main.go

@@ -100,10 +100,10 @@ func (e *env) run() {
 				state.spriteIdx,
 				state.zoom,
 			)
-			state.step += 1
-
 			state.present(pWin)
 		}
+
+		state.step += 1
 	})
 }
 

internal/conv/object.go

@@ -43,6 +43,8 @@ func ConvertObject(rawObj *data.Object, name string) *Object {
 	return out
 }
 
+var transparent = color.RGBA{0, 0, 0, 0}
+
 // WIP. Try to convert the pixeldata into a picture.
 func spriteToPic(sprite *data.Sprite) *pixel.PictureData {
 	pic := pixel.MakePictureData(pixel.R(float64(0), float64(0), float64(sprite.Width), float64(sprite.Height)))
@@ -77,9 +79,14 @@ func spriteToPic(sprite *data.Sprite) *pixel.PictureData {
 
 		// Ignore the record separator
 		rowData = rowData[0 : len(rowData)-1]
-
 		leftPad := (int(sprite.Width) - len(rowData)) / 2
 
+		// Set all bytes to be transparent by default
+		for allX := 0; allX < int(sprite.Width); allX++ {
+			idx := pic.Index(pixel.V(float64(allX), float64(y)))
+			pic.Pix[idx] = transparent
+		}
+
 		for x, b := range rowData {
 			idx := pic.Index(pixel.V(float64(leftPad+x), float64(y)))
 			r, g, b, a := data.ColorPalette[int(b)].RGBA()