From 3e71ee13a3a28a2264fbb0c62a47d21c964ea41a Mon Sep 17 00:00:00 2001
From: Vanessa Dannenberg <vanessa.e.dannenberg@gmail.com>
Date: Sun, 30 Sep 2018 16:48:14 -0400
Subject: update street signs

---
 street_signs/api.lua | 487 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 487 insertions(+)
 create mode 100644 street_signs/api.lua

(limited to 'street_signs/api.lua')

diff --git a/street_signs/api.lua b/street_signs/api.lua
new file mode 100644
index 0000000..1ac4afe
--- /dev/null
+++ b/street_signs/api.lua
@@ -0,0 +1,487 @@
+-- signs api; most of this came from signs_lib but rewritten to some degree
+
+local S = street_signs.gettext
+
+local wall_dir_change = {
+	[0] = 2,
+	2,
+	5,
+	4,
+	2,
+	3,
+}
+
+street_signs.wallmounted_rotate = function(pos, node, user, mode)
+	if mode ~= screwdriver.ROTATE_FACE then return false end
+	minetest.swap_node(pos, { name = node.name, param2 = wall_dir_change[node.param2 % 6] })
+	for _, v in ipairs(minetest.get_objects_inside_radius(pos, 0.5)) do
+		local e = v:get_luaentity()
+		if e and e.name == "street_signs:text" then
+			v:remove()
+		end
+	end
+	street_signs.update_sign(pos)
+	return true
+end
+
+street_signs.facedir_rotate = function(pos, node, user, mode)
+	if mode ~= screwdriver.ROTATE_FACE then return false end
+	newparam2 = ((node.param2 % 6 ) == 0) and 1 or 0
+	minetest.swap_node(pos, { name = node.name, param2 = newparam2 })
+	for _, v in ipairs(minetest.get_objects_inside_radius(pos, 0.5)) do
+		local e = v:get_luaentity()
+		if e and e.name == "street_signs:text" then
+			v:remove()
+		end
+	end
+	street_signs.update_sign(pos)
+	return true
+end
+
+street_signs.modpath = minetest.get_modpath("street_signs")
+
+local DEFAULT_TEXT_SCALE = {x=10, y=10}
+
+-- infinite stacks
+
+if not minetest.settings:get_bool("creative_mode") then
+	street_signs.expect_infinite_stacks = false
+else
+	street_signs.expect_infinite_stacks = true
+end
+
+-- CONSTANTS
+
+-- Path to the textures.
+local TP = street_signs.path .. "/textures"
+-- Font file formatter
+local CHAR_FILE = "%s_%02x.png"
+-- Fonts path
+local CHAR_PATH = TP .. "/" .. CHAR_FILE
+
+-- Lots of overkill here. KISS advocates, go away, shoo! ;) -- kaeza
+
+local PNG_HDR = string.char(0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A)
+
+-- check if a file does exist
+-- to avoid reopening file after checking again
+-- pass TRUE as second argument
+function file_exists(name, return_handle, mode)
+	mode = mode or "r";
+	local f = io.open(name, mode)
+	if f ~= nil then
+		if (return_handle) then
+			return f
+		end
+		io.close(f) 
+		return true 
+	else 
+		return false 
+	end
+end
+
+-- Read the image size from a PNG file.
+-- Returns image_w, image_h.
+-- Only the LSB is read from each field!
+local function read_image_size(filename)
+	local f = file_exists(filename, true, "rb")
+	-- file might not exist (don't crash the game)
+	if (not f) then
+		return 0, 0
+	end
+	f:seek("set", 0x0)
+	local hdr = f:read(string.len(PNG_HDR))
+	if hdr ~= PNG_HDR then
+		f:close()
+		return
+	end
+	f:seek("set", 0x13)
+	local ws = f:read(1)
+	f:seek("set", 0x17)
+	local hs = f:read(1)
+	f:close()
+	return ws:byte(), hs:byte()
+end
+
+-- 4 rows, max 80 chars per, plus a bit of fudge to
+-- avoid excess trimming (e.g. due to color codes)
+
+local MAX_INPUT_CHARS = 400
+
+-- helper functions to trim sign text input/output
+
+local function trim_input(text)
+	return text:sub(1, math.min(MAX_INPUT_CHARS, text:len()))
+end
+
+local function build_char_db(font_size)
+
+	local cw = {}
+
+	-- To calculate average char width.
+	local total_width = 0
+	local char_count = 0
+
+	for c = 32, 255 do
+		local w, h = read_image_size(CHAR_PATH:format("street_signs_font_"..font_size.."px", c))
+		if w and h then
+			local ch = string.char(c)
+			cw[ch] = w
+			total_width = total_width + w
+			char_count = char_count + 1
+		end
+	end
+
+	local cbw, cbh = read_image_size(TP.."/street_signs_color_"..font_size.."px_n.png")
+	assert(cbw and cbh, "error reading bg dimensions")
+	return cw, cbw, cbh, (total_width / char_count)
+end
+
+street_signs.charwidth15,
+street_signs.colorbgw15,
+street_signs.lineheight15,
+street_signs.avgwidth15 = build_char_db(15)
+
+street_signs.charwidth31,
+street_signs.colorbgw31,
+street_signs.lineheight31,
+street_signs.avgwidth31 = build_char_db(31)
+
+local sign_groups = {choppy=2, dig_immediate=2}
+local fences_with_sign = { }
+
+-- some local helper functions
+
+local function split_lines_and_words(text)
+	if not text then return end
+	local lines = { }
+	for _, line in ipairs(text:split("\n")) do
+		table.insert(lines, line:split(" "))
+	end
+	return lines
+end
+
+local math_max = math.max
+
+local function fill_line(x, y, w, c, font_size, colorbgw)
+	c = c or "0"
+	local tex = { }
+	for xx = 0, math.max(0, w), colorbgw do
+		table.insert(tex, (":%d,%d=street_signs_color_"..font_size.."px_%s.png"):format(x + xx, y, c))
+	end
+	return table.concat(tex)
+end
+
+-- make char texture file name
+-- if texture file does not exist use fallback texture instead
+local function char_tex(font_name, ch)
+	local c = ch:byte()
+	local exists, tex = file_exists(CHAR_PATH:format(font_name, c))
+	if exists and c ~= 14 then
+		tex = CHAR_FILE:format(font_name, c)
+	else
+		tex = CHAR_FILE:format(font_name, 0x0)
+	end
+	return tex, exists
+end
+
+local function make_line_texture(line, lineno, pos, line_width, line_height, cwidth_tab, font_size, colorbgw)
+	local width = 0
+	local maxw = 0
+	local font_name = "street_signs_font_"..font_size.."px"
+
+	local words = { }
+	local node = minetest.get_node(pos)
+	local def = minetest.registered_items[node.name]
+	local default_color = def.default_color or 0
+
+	local cur_color = tonumber(default_color, 16)
+
+	-- We check which chars are available here.
+	for word_i, word in ipairs(line) do
+		local chars = { }
+		local ch_offs = 0
+		local word_l = #word
+		local i = 1
+		while i <= word_l  do
+			local c = word:sub(i, i)
+			if c == "#" then
+				local cc = tonumber(word:sub(i+1, i+1), 16)
+				if cc then
+					i = i + 1
+					cur_color = cc
+				end
+			else
+				local w = cwidth_tab[c]
+				if w then
+					width = width + w + 1
+					if width >= (line_width - cwidth_tab[" "]) then
+						width = 0
+					else
+						maxw = math_max(width, maxw)
+					end
+					if #chars < MAX_INPUT_CHARS then
+						table.insert(chars, {
+							off = ch_offs,
+							tex = char_tex(font_name, c),
+							col = ("%X"):format(cur_color),
+						})
+					end
+					ch_offs = ch_offs + w
+				end
+			end
+			i = i + 1
+		end
+		width = width + cwidth_tab[" "] + 1
+		maxw = math_max(width, maxw)
+		table.insert(words, { chars=chars, w=ch_offs })
+	end
+
+	-- Okay, we actually build the "line texture" here.
+
+	local texture = { }
+
+	local start_xpos = math.floor((line_width - maxw) / 2) + def.x_offset
+
+	local xpos = start_xpos
+	local ypos = (line_height + def.line_spacing)* lineno + def.y_offset
+
+	cur_color = nil
+
+	for word_i, word in ipairs(words) do
+		local xoffs = (xpos - start_xpos)
+		if (xoffs > 0) and ((xoffs + word.w) > maxw) then
+			table.insert(texture, fill_line(xpos, ypos, maxw, "n", font_size, colorbgw))
+			xpos = start_xpos
+			ypos = ypos + line_height + def.line_spacing
+			lineno = lineno + 1
+			if lineno >= def.number_of_lines then break end
+			table.insert(texture, fill_line(xpos, ypos, maxw, cur_color, font_size, colorbgw))
+		end
+		for ch_i, ch in ipairs(word.chars) do
+			if ch.col ~= cur_color then
+				cur_color = ch.col
+				table.insert(texture, fill_line(xpos + ch.off, ypos, maxw, cur_color, font_size, colorbgw))
+			end
+			table.insert(texture, (":%d,%d=%s"):format(xpos + ch.off, ypos, ch.tex))
+		end
+		table.insert(
+			texture, 
+			(":%d,%d="):format(xpos + word.w, ypos) .. char_tex(font_name, " ")
+		)
+		xpos = xpos + word.w + cwidth_tab[" "]
+		if xpos >= (line_width + cwidth_tab[" "]) then break end
+	end
+
+	table.insert(texture, fill_line(xpos, ypos, maxw, "n", font_size, colorbgw))
+	table.insert(texture, fill_line(start_xpos, ypos + line_height, maxw, "n", font_size, colorbgw))
+
+	return table.concat(texture), lineno
+end
+
+local function make_sign_texture(lines, pos)
+	local node = minetest.get_node(pos)
+	local def = minetest.registered_items[node.name]
+
+	local font_size
+	local line_width
+	local line_height
+	local char_width
+	local colorbgw
+
+	if def.font_size and def.font_size == 31 then
+		font_size = 31
+		line_width = math.floor(street_signs.avgwidth31 * def.chars_per_line) * def.horiz_scaling
+		line_height = street_signs.lineheight31
+		char_width = street_signs.charwidth31
+		colorbgw = street_signs.colorbgw31
+	else
+		font_size = 15
+		line_width = math.floor(street_signs.avgwidth15 * def.chars_per_line) * def.horiz_scaling
+		line_height = street_signs.lineheight15
+		char_width = street_signs.charwidth15
+		colorbgw = street_signs.colorbgw15
+	end
+
+	local texture = { ("[combine:%dx%d"):format(line_width, (line_height + def.line_spacing) * def.number_of_lines * def.vert_scaling) }
+
+	local lineno = 0
+	for i = 1, #lines do
+		if lineno >= def.number_of_lines then break end
+		local linetex, ln = make_line_texture(lines[i], lineno, pos, line_width, line_height, char_width, font_size, colorbgw)
+		table.insert(texture, linetex)
+		lineno = ln + 1
+	end
+	table.insert(texture, "^[makealpha:0,0,0")
+	return table.concat(texture, "")
+end
+
+local function set_obj_text(obj, text, x, pos)
+	local split = split_lines_and_words
+	local text_ansi = Utf8ToAnsi(text)
+	local n = minetest.registered_nodes[minetest.get_node(pos).name]
+	local text_scale = (n and n.text_scale) or DEFAULT_TEXT_SCALE
+	local texture = make_sign_texture(split(text_ansi), pos)
+	obj:set_properties({
+		textures={texture},
+		visual_size = text_scale,
+	})
+end
+
+street_signs.construct_sign = function(pos)
+	local meta = minetest.get_meta(pos)
+	meta:set_string(
+		"formspec",
+		"size[5,2.25]"..
+		"textarea[0.55,0.1;4.5,1.5;text;;${text}]"..
+		"button_exit[1.5,1.65;2,1;ok;"..S("Write").."]"..
+		"background[-0.20,-0.25;5.41,2.98;street_signs_bg.png]")
+	meta:set_string("infotext", "")
+end
+
+street_signs.destruct_sign = function(pos)
+	local objects = minetest.get_objects_inside_radius(pos, 0.5)
+	for _, v in ipairs(objects) do
+		local e = v:get_luaentity()
+		if e and e.name == "street_signs:text" then
+			v:remove()
+		end
+	end
+end
+
+local function make_infotext(text)
+	text = trim_input(text)
+	local lines = split_lines_and_words(text) or {}
+	local lines2 = { }
+	for _, line in ipairs(lines) do
+		table.insert(lines2, (table.concat(line, " "):gsub("#[0-9a-fA-F]", ""):gsub("##", "#")))
+	end
+	return table.concat(lines2, "\n")
+end
+
+street_signs.update_sign = function(pos, fields)
+	local meta = minetest.get_meta(pos)
+
+	local text = fields and fields.text or meta:get_string("text")
+	text = trim_input(text)
+
+	meta:set_string("infotext", make_infotext(text).." ")
+	meta:set_string("text", text)
+
+	local objects = minetest.get_objects_inside_radius(pos, 0.5)
+	local found
+	for _, v in ipairs(objects) do
+		local e = v:get_luaentity()
+		if e and e.name == "street_signs:text" then
+			if found then
+				v:remove()
+			else
+				set_obj_text(v, text, nil, pos)
+				found = true
+			end
+		end
+	end
+	if found then
+		return
+	end
+
+	-- if there is no entity
+	local signnode = minetest.get_node(pos)
+	local signname = signnode.name
+	local def = minetest.registered_items[signname]
+	if not def.entity_info or not def.entity_info.yaw[signnode.param2 + 1] then return end
+	local obj = minetest.add_entity(pos, "street_signs:text")
+
+	obj:setyaw(def.entity_info.yaw[signnode.param2 + 1])
+	obj:set_properties({
+		mesh = def.entity_info.mesh,
+	})
+end
+
+function street_signs.receive_fields(pos, formname, fields, sender)
+	if minetest.is_protected(pos, sender:get_player_name()) then
+		minetest.record_protection_violation(pos,
+			sender:get_player_name())
+		return
+	end
+	if fields and fields.text and fields.ok then
+		minetest.log("action", S("@1 wrote \"@2\" to sign at @3",
+			(sender:get_player_name() or ""),
+			fields.text:gsub('\\', '\\\\'):gsub("\n", "\\n"),
+			minetest.pos_to_string(pos)
+		))
+		street_signs.update_sign(pos, fields)
+	end
+end
+
+local signs_text_on_activate
+
+signs_text_on_activate = function(self)
+	local pos = self.object:getpos()
+	local meta = minetest.get_meta(pos)
+	local signnode = minetest.get_node(pos)
+	local signname = signnode.name
+	local def = minetest.registered_items[signname]
+	local text = meta:get_string("text")
+	if text and def and def.entity_info then
+		text = trim_input(text)
+		set_obj_text(self.object, text, nil, pos)
+		self.object:set_properties({
+			mesh = def.entity_info.mesh,
+		})
+	end
+end
+
+minetest.register_entity("street_signs:text", {
+	collisionbox = { 0, 0, 0, 0, 0, 0 },
+	visual = "mesh",
+	mesh = "street_signs_basic_entity.obj",
+	textures = {},
+	on_activate = signs_text_on_activate,
+})
+
+-- make selection boxes
+-- sizex/sizey specified in inches because that's what MUTCD uses.
+
+function street_signs.make_selection_boxes(sizex, sizey, onpole, xoffs, yoffs, zoffs)
+	local tx = (sizex * 0.0254 ) / 2
+	local ty = (sizey * 0.0254 ) / 2
+	local xo = xoffs and xoffs * 0.0254 or 0
+	local yo = yoffs and yoffs * 0.0254 or 0
+	local zo = zoffs and zoffs * 0.0254 or 0
+
+
+	local t = { -0.5, -ty + yo, -tx + xo, -0.4375, ty + yo, tx + xo }
+
+	if onpole == "_onpole" then
+		return {
+			type = "wallmounted",
+			wall_side = { t[1] - 0.3125 + zo, t[2], t[3], t[4] - 0.3125 + zo, t[5], t[6] },
+			wall_top = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5 },
+			wall_bottom = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5 },
+		}
+	else
+		return {
+			type = "wallmounted",
+			wall_side = t,
+			wall_top = { t[3] - xo, -t[1], t[2] + yo, t[6] - xo, -t[4], t[5] + yo},
+			wall_bottom = { t[3] - xo, t[1], t[2] + yo, t[6] - xo, t[4], t[5] + yo }
+		}
+	end
+end
+
+-- switch models to pole-mounted if appropriate
+
+street_signs.after_place_node = function(pos, placer, itemstack, pointed_thing)
+	local ppos = minetest.get_pointed_thing_position(pointed_thing)
+	local pnode = minetest.get_node(ppos)
+	local pdef = minetest.registered_items[pnode.name]
+	if (pdef and pdef.drawtype == "fencelike")
+	  or string.find(pnode.name, "default:fence_")
+	  or pnode.name == "coloredwood:fence"
+	  or (pnode.name == "streets:bigpole" and pnode.param2 < 4)
+	  or (pnode.name == "streets:bigpole" and pnode.param2 > 19 and pnode.param2 < 24) then
+		local node = minetest.get_node(pos)
+		minetest.swap_node(pos, {name = itemstack:get_name().."_onpole", param2 = node.param2})
+	end
+end
-- 
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