game/project.godot

@@ -19,3 +19,5 @@ window/size/viewport_height=720
 
 renderer/rendering_method="gl_compatibility"
 renderer/rendering_method.mobile="gl_compatibility"
+textures/canvas_textures/default_texture_filter=0
+2d/snap/snap_2d_transforms_to_pixel=true

game/scripts/art/pixel_style.gd

@@ -0,0 +1,471 @@
+class_name PixelStyle
+extends ArtStyle
+## Pixel art in the manner of classic farming games, drawn in code. A tile
+## is 16 by 16 pixels, seen a little from the front: rock shows its face
+## toward open ground, and figures, animals and plants stand upright. Every
+## graphic is made once as a small image, pixel by pixel from the palette,
+## and kept; the camera enlarges each pixel to a crisp square.
+##
+## The subclasses choose the palette and the outlines.
+
+## Pixels along the edge of a tile.
+const TILE := 16
+## Rows of the face that rock shows toward open ground below it.
+const FACE := 6
+## Images of a burst of chips, from the hit to its end.
+const HIT_FRAMES := 6
+## Size of a figure: a tile wide and one and a half tiles tall.
+const FIGURE_SIZE := Vector2i(16, 24)
+const CLEAR := Color(0, 0, 0, 0)
+
+## Colours by name; the subclass fills them.
+var palette: Dictionary[String, Color] = {}
+## The colours of the players, in the order of their numbers.
+var players: Array[Color] = []
+## True for outlines in a darker shade of what they surround, false for one
+## dark outline colour.
+var tinted_outlines := false
+var _textures: Dictionary[String, Texture2D] = {}
+
+
+## A small image that the drawings put their pixels on.
+class Pixels:
+	const SIDES: Array[Vector2i] = [Vector2i(1, 0), Vector2i(-1, 0), Vector2i(0, 1), Vector2i(0, -1)]
+	const CLEAR := Color(0, 0, 0, 0)
+
+	var image: Image
+	var size: Vector2i
+
+	func _init(width: int, height: int) -> void:
+		size = Vector2i(width, height)
+		image = Image.create_empty(width, height, false, Image.FORMAT_RGBA8)
+
+	func has(x: int, y: int) -> bool:
+		return x >= 0 and y >= 0 and x < size.x and y < size.y
+
+	func put(x: int, y: int, color: Color) -> void:
+		if has(x, y):
+			image.set_pixel(x, y, color)
+
+	## The colour at x, y, transparent outside the image.
+	func at(x: int, y: int) -> Color:
+		return image.get_pixel(x, y) if has(x, y) else CLEAR
+
+	func filled(x: int, y: int) -> bool:
+		return at(x, y).a > 0.0
+
+	## Lays the translucent `color` over the pixel at x, y.
+	func shade(x: int, y: int, color: Color) -> void:
+		if has(x, y):
+			image.set_pixel(x, y, image.get_pixel(x, y).blend(color))
+
+	func rect(x: int, y: int, width: int, height: int, color: Color) -> void:
+		for row in range(y, y + height):
+			for column in range(x, x + width):
+				put(column, row, color)
+
+	## Fills the ellipse around cx, cy with the half axes rx and ry.
+	func ellipse(cx: float, cy: float, rx: float, ry: float, color: Color) -> void:
+		for row in range(floori(cy - ry), ceili(cy + ry) + 1):
+			for column in range(floori(cx - rx), ceili(cx + rx) + 1):
+				var dx := (column + 0.5 - cx) / rx
+				var dy := (row + 0.5 - cy) / ry
+				if dx * dx + dy * dy <= 1.0:
+					put(column, row, color)
+
+	## A line of single pixels from x0, y0 to x1, y1.
+	func line(x0: int, y0: int, x1: int, y1: int, color: Color) -> void:
+		var dx := absi(x1 - x0)
+		var dy := -absi(y1 - y0)
+		var sx := 1 if x0 < x1 else -1
+		var sy := 1 if y0 < y1 else -1
+		var error := dx + dy
+		var x := x0
+		var y := y0
+		while true:
+			put(x, y, color)
+			if x == x1 and y == y1:
+				return
+			var twice := 2 * error
+			if twice >= dy:
+				error += dy
+				x += sx
+			if twice <= dx:
+				error += dx
+				y += sy
+
+	## Surrounds everything solid drawn so far with a line one pixel wide: in
+	## `color`, or, with `tinted`, in a darker shade of the pixel beside it.
+	func outline(color: Color, tinted: bool) -> void:
+		var found: Array[Vector3i] = []
+		var colors: Array[Color] = []
+		for y in size.y:
+			for x in size.x:
+				if filled(x, y):
+					continue
+				for side in SIDES:
+					var beside := at(x + side.x, y + side.y)
+					if beside.a >= 1.0:
+						found.append(Vector3i(x, y, 0))
+						colors.append(beside.darkened(0.5) if tinted else color)
+						break
+		for index in found.size():
+			put(found[index].x, found[index].y, colors[index])
+
+
+func player_color(player: int) -> Color:
+	return players[maxi(0, player) % players.size()]
+
+
+func _c(name: String) -> Color:
+	return palette[name]
+
+
+## The dark line around things, or around a thing of colour `fill` when
+## outlines are tinted.
+func _ink(fill: Color) -> Color:
+	return fill.darkened(0.5) if tinted_outlines else _c("outline")
+
+
+## A number from 0 to 1 that looks random and is the same for the same
+## arguments.
+static func _noise(x: int, y: int, salt: int) -> float:
+	return float(TileShape.variant(Vector2i(x * 31 + salt * 977, y * 17 - salt * 131)) % 1000) / 1000.0
+
+
+## The texture made by `make` under `key`, made only the first time.
+func _image(key: String, make: Callable) -> Texture2D:
+	var texture: Texture2D = _textures.get(key)
+	if texture == null:
+		var pixels: Pixels = make.call()
+		texture = ImageTexture.create_from_image(pixels.image)
+		_textures[key] = texture
+	return texture
+
+
+## Draws `texture` with its top left corner at `at`, on whole pixels.
+static func _put(canvas: CanvasItem, texture: Texture2D, at: Vector2, modulate := Color.WHITE) -> void:
+	canvas.draw_texture(texture, at.round(), modulate)
+
+
+## The neighbours of `mask` that change how a tile looks: the four sides,
+## and a corner only where both sides beside it are set.
+static func _shape(mask: int) -> int:
+	var result := mask & (TileShape.N | TileShape.E | TileShape.S | TileShape.W)
+	var corners := [
+		[TileShape.NE, TileShape.N | TileShape.E], [TileShape.SE, TileShape.S | TileShape.E],
+		[TileShape.SW, TileShape.S | TileShape.W], [TileShape.NW, TileShape.N | TileShape.W],
+	]
+	for corner: Array in corners:
+		var sides: int = corner[1]
+		if (mask & corner[0]) != 0 and (mask & sides) == sides:
+			result |= corner[0]
+	return result
+
+
+# Terrain.
+
+
+func _ground(canvas: CanvasItem, rect: Rect2, state: Dictionary) -> void:
+	var shadow: int = state.get("solid", 0) & (TileShape.N | TileShape.W | TileShape.NW)
+	var variant: int = state.get("variant", 0) % 8
+	_put(canvas, _image("ground/%d/%d" % [shadow, variant], func() -> Pixels: return _earth(variant, shadow)), rect.position)
+
+
+## The bare earth of the dead world: up to two soft patches of darker earth,
+## a light grain or two, now and then a pebble.
+func _earth(variant: int, shadow: int) -> Pixels:
+	var pixels := Pixels.new(TILE, TILE)
+	pixels.rect(0, 0, TILE, TILE, _c("ground"))
+	var patches: int = [0, 1, 2, 1, 0, 1, 1, 2][variant]
+	for patch in patches:
+		var at := _spot(patch, variant, 2, 11)
+		for dy in 2:
+			for dx in range(-1, 2):
+				if _noise(at.x + dx, at.y + dy, variant + 40) < 0.6:
+					pixels.put(at.x + dx, at.y + dy, _c("ground_dark"))
+	for grain in 1 + variant % 2:
+		var at := _spot(grain + 4, variant, 1, 14)
+		pixels.put(at.x, at.y, _c("ground_light"))
+	if variant % 4 == 1:
+		var at := _spot(9, variant, 3, 9)
+		_pebble(pixels, at.x, at.y)
+	_cast_shadow(pixels, shadow)
+	return pixels
+
+
+## A point in the tile that is the same for the same `index` and `variant`,
+## from `low` to `low + span - 1` on both axes.
+static func _spot(index: int, variant: int, low: int, span: int) -> Vector2i:
+	return Vector2i(low + int(_noise(index, 1, variant) * span), low + int(_noise(index, 2, variant) * span))
+
+
+func _pebble(pixels: Pixels, x: int, y: int) -> void:
+	pixels.put(x, y, _c("pebble_light"))
+	pixels.put(x + 1, y, _c("pebble"))
+	pixels.put(x, y + 1, _c("pebble"))
+	pixels.put(x + 1, y + 1, _c("pebble_dark"))
+
+
+## Darkens the ground where rock to the north or west casts its shadow; the
+## light falls from the top left.
+func _cast_shadow(pixels: Pixels, shadow: int) -> void:
+	var deep := Color(0, 0, 0, 0.32)
+	var faint := Color(0, 0, 0, 0.16)
+	if (shadow & TileShape.N) != 0:
+		for x in TILE:
+			pixels.shade(x, 0, deep)
+			pixels.shade(x, 1, deep if x % 2 == 0 else faint)
+			pixels.shade(x, 2, faint if x % 2 == 1 else CLEAR)
+	if (shadow & TileShape.W) != 0:
+		for y in range(1 if (shadow & TileShape.N) != 0 else 0, TILE):
+			pixels.shade(0, y, faint)
+	elif (shadow & (TileShape.N | TileShape.NW)) == TileShape.NW:
+		pixels.shade(0, 0, deep)
+
+
+func _soft_rock(canvas: CanvasItem, rect: Rect2, state: Dictionary) -> void:
+	_rock(canvas, rect, state, "soft")
+
+
+func _hard_rock(canvas: CanvasItem, rect: Rect2, state: Dictionary) -> void:
+	_rock(canvas, rect, state, "hard")
+
+
+func _bedrock(canvas: CanvasItem, rect: Rect2, state: Dictionary) -> void:
+	_rock(canvas, rect, state, "bed")
+
+
+## Rock of `kind`: its top, and its face where the ground below is open.
+## The ground shows where the outer corners are round.
+func _rock(canvas: CanvasItem, rect: Rect2, state: Dictionary, kind: String) -> void:
+	var mask := _shape(state.get("solid", 0))
+	var variant: int = state.get("variant", 0) % 4
+	_ground(canvas, rect, {"variant": state.get("variant", 0)})
+	var key := "%s/%d/%d" % [kind, mask, variant]
+	_put(canvas, _image(key, func() -> Pixels: return _rock_image(kind, mask, variant)), rect.position)
+
+
+func _rock_image(kind: String, mask: int, variant: int) -> Pixels:
+	var open_n := (mask & TileShape.N) == 0
+	var open_e := (mask & TileShape.E) == 0
+	var open_s := (mask & TileShape.S) == 0
+	var open_w := (mask & TileShape.W) == 0
+	var top_rows := TILE - FACE if open_s else TILE
+	var ink := _c("outline")
+	var pixels := Pixels.new(TILE, TILE)
+	for y in TILE:
+		for x in TILE:
+			var color := _c(kind + "_top")
+			if y >= top_rows:
+				color = _c(kind + "_face")
+				if y == top_rows or ((x + variant) % 4 == 0 and y < TILE - 2):
+					color = _c(kind + "_face_dark")
+			else:
+				if (open_n and y == 1) or (open_w and x == 1):
+					color = _c(kind + "_top_light")
+				elif open_e and x == TILE - 2:
+					color = _c(kind + "_top_dark")
+				if open_s and y == top_rows - 1:
+					color = _c(kind + "_lip")
+			pixels.put(x, y, color)
+	_rock_marks(pixels, kind, variant, top_rows)
+	if open_n:
+		pixels.rect(0, 0, TILE, 1, ink)
+	if open_w:
+		pixels.rect(0, 0, 1, TILE, ink)
+	if open_e:
+		pixels.rect(TILE - 1, 0, 1, TILE, ink)
+	if open_s:
+		pixels.rect(0, TILE - 1, TILE, 1, ink)
+	# Inner corners, where the mass turns around open ground.
+	if not open_n and not open_w and (mask & TileShape.NW) == 0:
+		pixels.put(0, 0, ink)
+	if not open_n and not open_e and (mask & TileShape.NE) == 0:
+		pixels.put(TILE - 1, 0, ink)
+	if not open_s and not open_w and (mask & TileShape.SW) == 0:
+		pixels.rect(0, TILE - FACE, 1, FACE, ink)
+	if not open_s and not open_e and (mask & TileShape.SE) == 0:
+		pixels.rect(TILE - 1, TILE - FACE, 1, FACE, ink)
+	# Round outer corners.
+	if open_n and open_w:
+		_round(pixels, Vector2i(0, 0), Vector2i(1, 1), ink)
+	if open_n and open_e:
+		_round(pixels, Vector2i(TILE - 1, 0), Vector2i(-1, 1), ink)
+	if open_s and open_w:
+		_round(pixels, Vector2i(0, TILE - 1), Vector2i(1, -1), ink)
+	if open_s and open_e:
+		_round(pixels, Vector2i(TILE - 1, TILE - 1), Vector2i(-1, -1), ink)
+	return pixels
+
+
+## Cuts the corner at `corner` and closes the outline one pixel further in,
+## in the direction `inward`.
+static func _round(pixels: Pixels, corner: Vector2i, inward: Vector2i, ink: Color) -> void:
+	pixels.put(corner.x, corner.y, CLEAR)
+	pixels.put(corner.x + inward.x, corner.y, CLEAR)
+	pixels.put(corner.x, corner.y + inward.y, CLEAR)
+	pixels.put(corner.x + inward.x, corner.y + inward.y, ink)
+
+
+## Small details on the top of rock: pores and chips on soft rock, glinting
+## crystals in hard rock, layers in bedrock.
+func _rock_marks(pixels: Pixels, kind: String, variant: int, top_rows: int) -> void:
+	var room := maxi(1, top_rows - 6)
+	for pore in 2:
+		var spot := Vector2i(3 + int(_noise(pore, 8, variant) * 10.0), 3 + int(_noise(pore, 9, variant) * room))
+		pixels.put(spot.x, spot.y, _c(kind + "_top_dark"))
+	var at := Vector2i(4 + int(_noise(7, 8, variant) * 7.0), 3 + int(_noise(7, 9, variant) * room))
+	match kind:
+		"soft":
+			if variant % 2 == 0:
+				pixels.put(at.x, at.y, _c("soft_top_dark"))
+				pixels.put(at.x + 1, at.y, _c("soft_top_dark"))
+				pixels.put(at.x + 1, at.y - 1, _c("soft_top_light"))
+				pixels.put(at.x + 2, at.y + 1, _c("soft_top_dark"))
+		"hard":
+			if variant % 2 == 1:
+				pixels.put(at.x, at.y, _c("hard_glint"))
+				pixels.put(at.x + 1, at.y, _c("hard_top_light"))
+				pixels.put(at.x, at.y + 1, _c("hard_top_light"))
+		"bed":
+			for row in range(4, top_rows - 1, 5):
+				for column in range(3, TILE - 3):
+					if _noise(column, row, variant) < 0.5:
+						pixels.put(column, row, _c("bed_top_dark"))
+
+
+func _cracks(canvas: CanvasItem, rect: Rect2, state: Dictionary) -> void:
+	var hits := clampi(state.get("hits", 1), 1, 3)
+	var variant: int = state.get("variant", 0) % 4
+	_put(canvas, _image("cracks/%d/%d" % [hits, variant], func() -> Pixels: return _crack_image(hits, variant)), rect.position)
+
+
+func _crack_image(hits: int, variant: int) -> Pixels:
+	var pixels := Pixels.new(TILE, TILE)
+	var path: Array[Vector2i] = []
+	var at := Vector2i(5 + variant, 3)
+	for step in 2 + hits * 3:
+		path.append(at)
+		var turn := _noise(step, hits, variant)
+		at += Vector2i(-1 if turn < 0.3 else (1 if turn > 0.65 else 0), 1)
+	if hits >= 2:
+		var branch: Vector2i = path[path.size() >> 1]
+		for step in 3:
+			branch += Vector2i(1, 1 if step % 2 == 0 else 0)
+			path.append(branch)
+	for point in path:
+		pixels.put(point.x + 1, point.y, _c("soft_top_light"))
+	for point in path:
+		pixels.put(point.x, point.y, _c("outline"))
+	return pixels
+
+
+func _hit(canvas: CanvasItem, rect: Rect2, state: Dictionary) -> void:
+	var frame := clampi(int(float(state.get("age", 0.0)) * HIT_FRAMES), 0, HIT_FRAMES - 1)
+	var variant: int = state.get("variant", 0) % 4
+	_put(canvas, _image("hit/%d/%d" % [frame, variant], func() -> Pixels: return _hit_image(frame, variant)), rect.position - Vector2(8, 8))
+
+
+## Chips that fly up and fall, and a puff of dust, in a square of two tiles
+## around the tile.
+func _hit_image(frame: int, variant: int) -> Pixels:
+	var pixels := Pixels.new(TILE * 2, TILE * 2)
+	var t := (frame + 1.0) / HIT_FRAMES
+	for chip in 5:
+		var angle := -PI / 2.0 + (chip - 2) * 0.6 + (variant - 1.5) * 0.15
+		var distance := 3.0 + t * 10.0
+		var x := roundi(TILE + cos(angle) * distance)
+		var y := roundi(TILE - 1 + sin(angle) * distance + t * t * 10.0)
+		pixels.put(x, y, _c("soft_top_light"))
+		if frame < 3 and chip % 2 == 0:
+			pixels.put(x + 1, y, _c("soft_top"))
+			pixels.put(x, y + 1, _c("soft_face"))
+			pixels.put(x + 1, y + 1, _c("soft_face_dark"))
+	if frame < 3:
+		pixels.outline(_c("outline"), tinted_outlines)
+		var radius := 3.0 + frame * 2.0
+		for puff in 8:
+			var angle := TAU * puff / 8.0 + variant
+			var dust := _c("dust")
+			dust.a = 0.75 - frame * 0.2
+			pixels.put(roundi(TILE + cos(angle) * radius), roundi(TILE - 1 + sin(angle) * radius * 0.6), dust)
+	return pixels
+
+
+func _marker(canvas: CanvasItem, rect: Rect2, state: Dictionary) -> void:
+	var reachable: bool = state.get("reachable", false)
+	_put(canvas, _image("marker/%s" % reachable, func() -> Pixels: return _marker_image(reachable)), rect.position - Vector2(1, 1))
+
+
+## Four corners around the tile, with a dark rim that shows on any ground.
+func _marker_image(reachable: bool) -> Pixels:
+	var pixels := Pixels.new(TILE + 2, TILE + 2)
+	var color := _c("marker_near") if reachable else _c("marker_far")
+	var last := TILE
+	for corner: Vector2i in [Vector2i(1, 1), Vector2i(last, 1), Vector2i(1, last), Vector2i(last, last)]:
+		var dx := 1 if corner.x == 1 else -1
+		var dy := 1 if corner.y == 1 else -1
+		for i in 4:
+			pixels.put(corner.x + dx * i, corner.y, color)
+			pixels.put(corner.x, corner.y + dy * i, color)
+	pixels.outline(_c("outline"), false)
+	return pixels
+
+
+# Figures.
+
+
+func _figure(canvas: CanvasItem, rect: Rect2, state: Dictionary) -> void:
+	var frame := 0
+	if state.get("moving", false):
+		frame = 1 + int(fposmod(float(state.get("step", 0.0)), TAU) / TAU * 4.0) % 4
+	var colour := maxi(0, state.get("player", -1)) % players.size()
+	var left: bool = float(state.get("facing", 1.0)) < 0.0
+	var foot := Vector2(rect.get_center().x, rect.end.y)
+	_put(canvas, _image("shadow/12", func() -> Pixels: return _shadow_image(12)), foot - Vector2(6, 2))
+	var key := "figure/%d/%d/%s" % [colour, frame, left]
+	_put(canvas, _image(key, func() -> Pixels: return _figure_image(colour, frame, left)), foot - Vector2(FIGURE_SIZE.x / 2.0, FIGURE_SIZE.y))
+
+
+## A soft shadow on the ground, `width` pixels wide.
+func _shadow_image(width: int) -> Pixels:
+	var pixels := Pixels.new(width, 3)
+	pixels.ellipse(width / 2.0, 1.5, width / 2.0, 1.5, Color(0, 0, 0, 0.28))
+	return pixels
+
+
+## A figure in walking frame `frame` (0 standing, 1 to 4 walking), facing
+## right or, with `left`, left. The shirt has the colour of the player.
+func _figure_image(colour: int, frame: int, left: bool) -> Pixels:
+	var pixels := Pixels.new(FIGURE_SIZE.x, FIGURE_SIZE.y)
+	var shirt := players[colour]
+	var bob := -1 if frame == 2 or frame == 4 else 0
+	# The far leg and the near leg, by frame.
+	var legs: Array[Vector2i] = [Vector2i(6, 9), Vector2i(5, 10), Vector2i(7, 8), Vector2i(10, 5), Vector2i(8, 7)]
+	for leg in 2:
+		var x := legs[frame].x if leg == 0 else legs[frame].y
+		var lifted := 1 if frame > 0 and frame % 2 == 1 and leg == 0 else 0
+		pixels.rect(x, 18, 2, 4 - lifted, _c("pants_dark") if leg == 0 else _c("pants"))
+		pixels.rect(x, 22 - lifted, 3, 2, _c("boots"))
+	pixels.rect(5, 11 + bob, 6, 8, shirt)
+	pixels.rect(5, 11 + bob, 1, 8, shirt.darkened(0.2))
+	pixels.rect(5, 18 + bob, 6, 1, shirt.darkened(0.35))
+	var swing: int = [0, 1, 0, -1, 0][frame]
+	pixels.rect(8 + swing, 12 + bob, 2, 5, shirt.darkened(0.15))
+	pixels.rect(8 + swing, 17 + bob, 2, 1, _c("skin"))
+	# The head: hair behind, the face in front, bangs above the eye.
+	pixels.ellipse(7.8, 5.8 + bob, 5.2, 5.0, _c("hair"))
+	pixels.ellipse(9.6, 7.4 + bob, 3.7, 3.9, _c("skin"))
+	pixels.rect(9, 3 + bob, 4, 2, _c("hair"))
+	pixels.put(6, 2 + bob, _c("hair_light"))
+	pixels.put(7, 2 + bob, _c("hair_light"))
+	pixels.put(8, 1 + bob, _c("hair_light"))
+	pixels.put(11, 6 + bob, _c("eye"))
+	pixels.put(11, 7 + bob, _c("eye"))
+	pixels.put(8, 8 + bob, _c("skin_shade"))
+	pixels.put(12, 9 + bob, _c("skin_shade"))
+	pixels.outline(_ink(shirt), tinted_outlines)
+	if left:
+		pixels.image.flip_x()
+	return pixels

game/scripts/art/pixel_style.gd.uid

@@ -0,0 +1 @@
+uid://jejn3txd0eor

game/scripts/art/warm_style.gd

@@ -1,11 +1,46 @@
 class_name WarmStyle
-extends ArtStyle
-## Warm, full colours and dark outlines, close to the classic farming games.
-## Until it draws pixel art, it draws the placeholders of ArtStyle.
+extends PixelStyle
+## Warm, full colours and dark outlines around figures and things, close to
+## the classic farming games.
 
 const KEY := &"warm"
 
 
+func _init() -> void:
+	palette = {
+		"outline": Color("3a2820"), "dust": Color("e9dcc6"),
+		"ground": Color("b98a5e"), "ground_dark": Color("a07650"), "ground_light": Color("cba077"),
+		"pebble": Color("8e8072"), "pebble_light": Color("b8ab9a"), "pebble_dark": Color("6b5f54"),
+		"dead_crack": Color("8a6646"),
+		"soft_top": Color("bcb0a0"), "soft_top_dark": Color("a69a8a"), "soft_top_light": Color("d6ccbd"),
+		"soft_face": Color("8f8170"), "soft_face_dark": Color("776a5b"), "soft_lip": Color("e4dccf"),
+		"hard_top": Color("7c88a2"), "hard_top_dark": Color("68738c"), "hard_top_light": Color("9aa6c0"),
+		"hard_face": Color("596380"), "hard_face_dark": Color("454d66"), "hard_lip": Color("b6c2da"),
+		"hard_glint": Color("dff4ff"),
+		"bed_top": Color("51453e"), "bed_top_dark": Color("433832"), "bed_top_light": Color("62554c"),
+		"bed_face": Color("382e29"), "bed_face_dark": Color("2b231f"), "bed_lip": Color("6e6157"),
+		"grass": Color("64a83f"), "grass_dark": Color("4e8f33"), "grass_light": Color("8acb52"),
+		"grass_edge": Color("3f7a2c"),
+		"flower_a": Color("f7e25c"), "flower_b": Color("fbf6ea"), "flower_c": Color("ef7fa6"),
+		"moss": Color("4e9a3a"), "moss_dark": Color("3b7b2e"), "moss_light": Color("7ec552"), "spore": Color("ffe57e"),
+		"vine": Color("4f9439"), "vine_dark": Color("38702a"), "leaf": Color("68b545"), "leaf_dark": Color("4c8d35"),
+		"stem": Color("5c9c3c"), "bud": Color("acd97a"), "fibre": Color("f8f3e6"), "fibre_shade": Color("dcd3c0"),
+		"seed": Color("7b5433"),
+		"stone": Color("a29a8f"), "stone_light": Color("c8c1b6"), "stone_dark": Color("7c756d"),
+		"wool": Color("f5f0e6"), "wool_shade": Color("dbd2c2"), "wool_light": Color("ffffff"),
+		"face": Color("4b3a31"), "hoof": Color("35281f"),
+		"ruin": Color("aaa395"), "ruin_dark": Color("8a8376"), "ruin_light": Color("c6bfb2"),
+		"ruin_moss": Color("5f9f43"), "door": Color("2b231f"), "glow": Color("ffd560"), "glow_light": Color("fff4c6"),
+		"skin": Color("f4cba5"), "skin_shade": Color("dba67f"), "hair": Color("6e4128"), "hair_light": Color("8f5a37"),
+		"eye": Color("2a1b15"), "pants": Color("4b5b8d"), "pants_dark": Color("3a4672"), "boots": Color("5b3a26"),
+		"marker_near": Color("fff6c2"), "marker_far": Color("ff705c"),
+	}
+	players = [
+		Color("d9573f"), Color("3f7fd1"), Color("e9b23c"), Color("4ea84a"),
+		Color("9a62c9"), Color("39a9a0"), Color("e271a1"), Color("e8873b"),
+	]
+
+
 func key() -> StringName:
 	return KEY
 

game/tests/test_pixel_style.gd

@@ -0,0 +1,81 @@
+extends TestCase
+## The pixel art of the ground, the rock and the figures, which every pixel
+## style draws.
+
+
+## How many pixels of `image` are not transparent.
+static func _opaque(image: Image) -> int:
+	var count := 0
+	for y in image.get_height():
+		for x in image.get_width():
+			if image.get_pixel(x, y).a > 0.0:
+				count += 1
+	return count
+
+
+func test_the_field_is_drawn_in_sharp_pixels() -> void:
+	check_eq(ProjectSettings.get_setting("rendering/textures/canvas_textures/default_texture_filter"), 0, "each pixel a square, not blurred")
+	check(ProjectSettings.get_setting("rendering/2d/snap/snap_2d_transforms_to_pixel"), "on whole pixels of the screen")
+
+
+func test_ground_fills_its_tile_and_lies_in_the_shadow_of_rock() -> void:
+	var style := WarmStyle.new()
+	var open := style._earth(3, 0).image
+	check_eq(open.get_size(), Vector2i(PixelStyle.TILE, PixelStyle.TILE), "a tile")
+	check_eq(_opaque(open), PixelStyle.TILE * PixelStyle.TILE, "no gaps")
+	var shaded := style._earth(3, TileShape.N).image
+	check(shaded.get_pixel(5, 0).get_luminance() < open.get_pixel(5, 0).get_luminance(), "darker below rock")
+	check_eq(shaded.get_pixel(5, 8), open.get_pixel(5, 8), "but only along the rock")
+
+
+func test_a_lone_rock_is_round_and_shows_its_face() -> void:
+	var style := WarmStyle.new()
+	var lone := style._rock_image("soft", 0, 0).image
+	check_eq(lone.get_pixel(0, 0).a, 0.0, "a round corner, the ground shows there")
+	check_eq(lone.get_pixel(PixelStyle.TILE - 1, PixelStyle.TILE - 1).a, 0.0, "round at the bottom too")
+	check_eq(lone.get_pixel(8, 0), style.palette["outline"], "outlined at the top")
+	check_eq(lone.get_pixel(8, PixelStyle.TILE - 1), style.palette["outline"], "and where it meets the ground")
+	check_eq(lone.get_pixel(5, PixelStyle.TILE - 3), style.palette["soft_face"], "its face toward the open ground")
+
+
+func test_rock_inside_a_mass_has_neither_edge_nor_face() -> void:
+	var style := WarmStyle.new()
+	var inside := style._rock_image("soft", 255, 0).image
+	check_eq(_opaque(inside), PixelStyle.TILE * PixelStyle.TILE, "no gaps")
+	for y in PixelStyle.TILE:
+		for x in PixelStyle.TILE:
+			var colour := inside.get_pixel(x, y)
+			check(colour != style.palette["outline"] and colour != style.palette["soft_face"], "inside at %d, %d" % [x, y])
+
+
+func test_only_the_corners_that_matter_tell_tiles_apart() -> void:
+	check_eq(PixelStyle._shape(TileShape.NE), 0, "a corner alone does not count")
+	check_eq(PixelStyle._shape(TileShape.N | TileShape.E | TileShape.NE), TileShape.N | TileShape.E | TileShape.NE, "between two sides it does")
+	check_eq(PixelStyle._shape(255), 255, "all of them inside a mass")
+
+
+func test_each_picture_is_made_only_once() -> void:
+	var style := WarmStyle.new()
+	var made := [0]
+	var make := func() -> PixelStyle.Pixels:
+		made[0] += 1
+		return PixelStyle.Pixels.new(1, 1)
+	var first := style._image("test/once", make)
+	var again := style._image("test/once", make)
+	check_eq(again, first, "the same picture")
+	check_eq(made[0], 1, "made once")
+
+
+func test_a_figure_walks_in_four_steps_and_faces_both_ways() -> void:
+	var style := WarmStyle.new()
+	var frames: Array[PackedByteArray] = []
+	for frame in 5:
+		var image := style._figure_image(0, frame, false).image
+		check_eq(image.get_size(), PixelStyle.FIGURE_SIZE, "a tile wide, one and a half tall")
+		check(not frames.has(image.get_data()), "frame %d differs from the others" % frame)
+		frames.append(image.get_data())
+	var left := style._figure_image(0, 1, true).image
+	left.flip_x()
+	check_eq(left.get_data(), frames[1], "facing left mirrors facing right")
+	var other := style._figure_image(1, 0, false).image
+	check(other.get_data() != frames[0], "another player has another colour")

game/tests/test_pixel_style.gd.uid

@@ -0,0 +1 @@
+uid://dr01kkrpn22sy

game/tests/test_warm_style.gd

@@ -0,0 +1,10 @@
+extends TestCase
+
+
+func test_four_players_have_four_colours() -> void:
+	var style := WarmStyle.new()
+	var colours := {}
+	for player in 4:
+		colours[style.player_color(player)] = true
+	check_eq(colours.size(), 4, "four players, four colours")
+	check_eq(style.player_color(-1), style.player_color(0), "a player not in the world yet looks like the first")

game/tests/test_warm_style.gd.uid

@@ -0,0 +1 @@
+uid://d00aodstjeia5