From 60dda2ea29c3663579b57051eb05774d64058830 Mon Sep 17 00:00:00 2001
From: Ale2610 <ale.proto00@gmail.com>
Date: Fri, 31 Jul 2015 21:52:20 +0200
Subject: [PATCH] Create gui.lua

---
 src/apis/gui.lua | 239 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 239 insertions(+)
 create mode 100644 src/apis/gui.lua

diff --git a/src/apis/gui.lua b/src/apis/gui.lua
new file mode 100644
index 0000000..cbc604b
--- /dev/null
+++ b/src/apis/gui.lua
@@ -0,0 +1,239 @@
+--[[GUI API BY MHIEKURU
+	functions available
+
+	OBJECTS
+	gui.background()
+	gui.progressBar()
+	gui.toggleButton()
+	gui.pulseButton()
+
+	RENDER
+	gui.render()
+]]
+--CORE FUNCTION--
+
+local function convertArea( vertex )
+	local xMax, yMax = term.getSize()
+	--if vertex consist of two numbers, convert given as length and height, then set starting vertex to the current cursor position
+	if type(vertex[1]) == 'number' and type(vertex[2]) == 'number' and vertex[3] == nil and vertex[4] == nil then
+		local x, y = term.getCursorPos()
+		if vertex[1] < 0 then
+			vertex[3] = xMax+vertex[1]+1
+		else
+			vertex[3] = x-1+vertex[1]
+		end
+		if vertex[2] < 0 then
+			vertex[4] = yMax+vertex[2]+1
+		else
+			vertex[4] = y-1+vertex[2]
+		end
+		vertex[1] = x
+		vertex[2] = y
+	--if vertex consist of four numbers, convert each number to its [maxAxis plus the negative vertex plus one] if the vertex is a negative value
+	elseif type(vertex[1]) == 'number' and type(vertex[2]) == 'number' and type(vertex[3]) == 'number' and type(vertex[4]) == 'number' then
+		if vertex[1] < 0 then
+			vertex[1] = xMax+vertex[1]+1
+		end
+		if vertex[2] < 0 then
+			vertex[2] = yMax+vertex[2]+1
+		end
+		if vertex[3] < 0 then
+			vertex[3] = xMax+vertex[3]+1
+		end
+		if vertex[4] < 0 then
+			vertex[4] = yMax+vertex[4]+1
+		end
+	end
+	--switch vertex[1] and vertex[3] if vertex[1] is greater
+	local placeHolderX, placeHolderY
+	if vertex[3] < vertex[1] then
+		placeHolderX = vertex[1]
+		vertex[1] = vertex[3]
+		vertex[3] = placeHolderX
+	end
+	--switch vertex[1] and vertex[3] if vertex[1] is greater
+	if vertex[4] < vertex[2] then
+		placeHolderY = vertex[2]
+		vertex[2] = vertex[4]
+		vertex[4] = placeHolderY
+	end
+	return vertex
+end
+
+local function fill( vertex, color )
+	term.setBackgroundColor( color )
+	for i = vertex[2], vertex[4] do
+		term.setCursorPos( vertex[1], i )
+		write( string.rep( ' ', vertex[3] - vertex[1] + 1 ) )
+	end
+end
+
+function setCursorPos( vertex, string, position )
+	if position == 'c' then
+		term.setCursorPos( math.ceil( ( ( vertex[3] - vertex[1] + 1 - #string ) / 2 ) + vertex[1] ),
+			math.ceil( ( math.floor(vertex[4]) + math.floor(vertex[2]) ) / 2 ) )
+	elseif position == 'l' then
+		term.setCursorPos( vertex[1], math.ceil( ( math.floor(vertex[4]) + math.floor(vertex[2]) ) / 2 ) )
+	end
+end
+
+--GUI LIBRARY--
+
+background = function( color )
+	return
+		{
+		type = 'background',
+		color = color
+		}
+end
+
+progressBar = function( vertex, color, string )
+	return
+		{
+		type = 'bar_percent',
+		vertex = vertex,
+		color = color,
+		string = string,
+		}
+end
+
+toggleButton = function( vertex, color, string, guifunction )
+	return
+		{
+		type = 'button_toggle',
+		vertex = vertex,
+		color = color,
+		string = string,
+		guifunction = guifunction,
+		state = 1
+		}
+end
+
+pulseButton = function( vertex, color, string, guifunction )
+	return
+		{
+		type = 'button_pulse',
+		vertex = vertex,
+		color = color,
+		string = string,
+		guifunction = guifunction,
+		}
+end
+
+render = function(gui)
+	local counter = 0
+	local counterEvent
+	local refreshrate = 0
+	os.startTimer(0)
+	while true do
+		if counter == 3 then
+			if gui[counterEvent].guifunction then
+				local startTime = os.clock()
+				gui[counterEvent].guifunction()
+				if os.clock() > startTime+refreshrate then
+					os.startTimer(refreshrate)
+				end
+			end
+			counter = 0
+		elseif counter > 0 then
+			counter = counter+1
+		end
+		--wait event
+		local event, mbttn, crsrX, crsrY = os.pullEvent()
+		--check and run functions
+		if event == 'mouse_click' or event == 'monitor_touch' or event == 'mouse_drag' then
+			local startTime = os.clock()
+			for i = 1, #gui do
+				if gui[i].type == 'button_toggle' or gui[i].type == 'button_pulse' then
+					if crsrX >= gui[i].vertex[1] and crsrX <= gui[i].vertex[3] and crsrY >= gui[i].vertex[2] and crsrY <= gui[i].vertex[4] then
+						if gui[i].type == 'button_toggle' then
+							if gui[i].guifunction then
+								gui[i].guifunction[gui[i].state]()
+							end
+							if mbttn == 1 then -- [+]
+								if gui[i].state == #gui[i].color then --only when func activated
+									gui[i].state = 1
+								else
+									gui[i].state = gui[i].state + 1
+								end
+							else -- [-]
+								if gui[i].state == 1 then --only when func activated
+									gui[i].state = #gui[i].color
+								else
+									gui[i].state = gui[i].state - 1
+								end
+							end
+						elseif gui[i].type == 'button_pulse' then
+							counter = 1
+							counterEvent = i
+						end
+					end
+				end
+			end
+			if os.clock() > startTime+refreshrate then
+				os.startTimer(refreshrate)
+			end
+		elseif event == 'timer' then
+			--render
+			for i, v in ipairs(gui) do
+				if gui[i].type == 'button_toggle' then
+					gui[i].vertex = convertArea( gui[i].vertex )
+					--renders button's background
+					fill( gui[i].vertex, gui[i].color[gui[i].state] )
+					--renders button's text
+					setCursorPos( gui[i].vertex, gui[i].string[gui[i].state], 'c' )
+					term.setTextColor( colors.white )
+					write( gui[i].string[gui[i].state] )
+					term.setCursorPos( gui[i].vertex[1], gui[i].vertex[4] + 2 )
+				elseif gui[i].type == 'button_pulse' then
+					gui[i].vertex = convertArea( gui[i].vertex )
+					--renders button's background
+					if counter == 0 then
+						fill( gui[i].vertex, gui[i].color[1] )
+					else
+						fill( gui[i].vertex, gui[i].color[2] )
+					end
+					--renders button's text
+					setCursorPos( gui[i].vertex, gui[i].string, 'c' )
+					term.setTextColor( colors.white )
+					write( gui[i].string )
+					term.setCursorPos( gui[i].vertex[1], gui[i].vertex[4] + 2 )
+				elseif gui[i].type == 'bar_percent' then
+					if gui[i].string then
+						local percent = gui[i].string()
+						gui[i].vertex = convertArea( gui[i].vertex )
+						if percent > 100 then percent = 100 end --limit percent to 100%
+						--renders progress bar's background
+						fill( {math.floor(((gui[i].vertex[3]-gui[i].vertex[1]+1)*percent/100)+gui[i].vertex[1]), gui[i].vertex[2], gui[i].vertex[3], gui[i].vertex[4]}, gui[i].color[1] )
+						--renders progress bar's foreground
+						fill( {gui[i].vertex[1], gui[i].vertex[2], math.floor(((gui[i].vertex[3]-gui[i].vertex[1]+1)*percent/100)+gui[i].vertex[1]-1), gui[i].vertex[4]}, gui[i].color[2] )
+						--renders data to be displayed
+						local perTab = {}
+						for j = 1, #tostring( percent .. '%' ) do
+ 						   perTab[ j ] = tostring( percent .. '%' ):sub( j, j )
+						end
+						setCursorPos( gui[i].vertex, perTab, 'c' )
+						for j = 1, #perTab do
+							local perX, perY = term.getCursorPos()
+							if perX <= math.floor(((gui[i].vertex[3]-gui[i].vertex[1]+1)*percent/100)+gui[i].vertex[1]-1) and perX >= gui[i].vertex[1] then
+								term.setBackgroundColor(gui[i].color[2])
+								term.setTextColor(gui[i].color[1])
+							else
+								term.setBackgroundColor(gui[i].color[1])
+								term.setTextColor(gui[i].color[2])
+							end
+							write(perTab[j])
+						end
+						term.setCursorPos( gui[i].vertex[1], gui[i].vertex[4] + 2 )
+					end
+				elseif gui[i].type == 'background' then
+					local x, y = term.getCursorPos()
+					term.setBackgroundColor( gui[ i ].color )
+					term.clear()
+					term.setCursorPos( x, y )
+				end
+			end
+			os.startTimer(refreshrate)
+		end
+	end
+end