graphScene_1.lua

local composer = require( "composer" )
local widget = require( "widget" )
local graphLib = require( "modules.graphLib" )
local ioLib = require( "modules.ioLib" )
 
local scene = composer.newScene()
--composer.recycleOnSceneChange = true -- clear the graph and view, allows fresh graph data on re-visit if file changed.

-- set default scale
local scale = {}
scale.xMin = xMin or -10
scale.xMax = xMax or 10
scale.yMin = yMin or -10
scale.yMax = yMax or 10
scale.zoomLevel = 5

local mainGraph
local graphPoints = ioLib.cleanGraphData( graphFile, system.DocumentsDirectory )

-- -----------------------------------------------------------------------------------
-- Code outside of the scene event functions below will only be executed ONCE unless
-- the scene is removed entirely (not recycled) via "composer.removeScene()"
-- -----------------------------------------------------------------------------------
  
-- -----------------------------------------------------------------------------------
-- Scene event functions
-- -----------------------------------------------------------------------------------
 
 local function homeHandler( event )
	graphFile = "" -- delete the graph file name, to prevent old data from being plotted if new file is erroneous. 
	composer.gotoScene( "openingScene", "fade" )	
 end
 
local function graphScene_2( event )
	composer.gotoScene( "graphScene_2", "slideLeft" )
end

local function zoomIn( event )
	--local sceneGroup = scene.view
	if scale.zoomLevel > 2  then -- min of 40%
		mainGraph:removeSelf() 
		scale.zoomLevel = scale.zoomLevel -1
		local factor = scale.zoomLevel *0.2 -- 20% zoom increments
		mainGraph = graphLib.newGraph( graphPoints , nil, 
			scale.xMin * factor,
			scale.xMax * factor,
			scale.yMin * factor,
			scale.yMax * factor
		)
		scene.view:insert( mainGraph )
	end
end

local function zoomOut( event )
	if scale.zoomLevel < 8 then -- max of 160%
		mainGraph:removeSelf()
		scale.zoomLevel = scale.zoomLevel +1
		local factor = scale.zoomLevel *0.2 -- 20% zoom increments
		mainGraph = graphLib.newGraph( graphPoints , nil, 
			scale.xMin * factor,
			scale.xMax * factor,
			scale.yMin * factor,
			scale.yMax * factor
		)
		scene.view:insert( mainGraph )
	end		
end
 
 local function addOverlay( event )
	print( "Add overlay was pressed" )
 end
 
-- create()
function scene:create( event )
    local sceneGroup = self.view
    -- Code here runs when the scene is first created but has not yet appeared on screen

	local tabButtons = {
		{ label="Home", defaultFile="artAssets/icons8-home-50.png", overFile="artAssets/icons8-home-50.png", width = 32, height = 32, onPress=homeHandler },
		{ label="Raw", defaultFile="artAssets/icons8-graph-40.png", overFile="artAssets/icons8-graph-40.png", width = 32, height = 32, onPress=graphScene_1, selected=true },
		{ label="doubleY", defaultFile="artAssets/icons8-graph-40.png", overFile="artAssets/icons8-graph-40.png", width = 32, height = 32, onPress=graphScene_2 },
	}

	-- tabBar widget
	local tabBar = widget.newTabBar{ sceneGroup,
		top = display.contentHeight - 50,	-- 50 is default height for tabBar widget
		buttons = tabButtons
	}
		
	local zoomInButton = widget.newButton(
		{
			onRelease = zoomIn,
			shape = "roundedRect",
			width = 70,	height = 20, cornerRadius = 10,
			x = display.actualContentWidth /6,
			y = display.actualContentHeight /1.2,
			label = "Zoom in", fontSize = 14, font = native.systemFont,
			labelColor = { default={.8,.8,.8}, over={0,.5,.8} },
			fillColor = { default={0,0,0,0}, over={1,0.5,0.5,0} },
			strokeColor = { default={1,1,1,.2}, over={0.8,0.8,1,1} },
			strokeWidth = 2,
		})	
	local zoomOutButton = widget.newButton(
		{
			onRelease = zoomOut,
			shape = "roundedRect",
			width = 70,	height = 20, cornerRadius = 10,
			x = display.actualContentWidth /1.2,
			y = display.actualContentHeight /1.2,
			label = "Zoom out", fontSize = 14, font = native.systemFont,
			labelColor = { default={.8,.8,.8}, over={0,.5,.8} },
			fillColor = { default={0,0,0,0}, over={1,0.5,0.5,0} },
			strokeColor = { default={1,1,1,.2}, over={0.8,0.8,1,1} },
			strokeWidth = 2,
		})
	local addOverlayButton = widget.newButton(
		{
			onRelease = addOverlay,
			shape = "roundedRect",
			width = 80,	height = 20, cornerRadius = 10,
			x = display.actualContentWidth /2,
			y = display.actualContentHeight /1.2,
			label = "Add overlay", fontSize = 14, font = native.systemFont,
			labelColor = { default={.8,.8,.8}, over={0,.5,.8} },
			fillColor = { default={0,0,0,0}, over={1,0.5,0.5,0} },
			strokeColor = { default={1,1,1,.2}, over={0.8,0.8,1,1} },
			strokeWidth = 2,
		})
	
	sceneGroup:insert( tabBar )
	sceneGroup:insert( zoomInButton )
	sceneGroup:insert( zoomOutButton )
	sceneGroup:insert( addOverlayButton )
end
 
 
-- show()
function scene:show( event )
 
    local sceneGroup = self.view
    local phase = event.phase
 
    if ( phase == "will" ) then
        -- Code here runs when the scene is still off screen (but is about to come on screen)
		mainGraph = graphLib.newGraph( graphPoints , nil, scale.xMin, scale.xMax, scale.yMin, scale.yMax )
		sceneGroup:insert( mainGraph )
    elseif ( phase == "did" ) then
        -- Code here runs when the scene is entirely on screen
    end
end
 
 
-- hide()
function scene:hide( event )
 
    local sceneGroup = self.view
    local phase = event.phase
 
    if ( phase == "will" ) then
        -- Code here runs when the scene is on screen (but is about to go off screen)

 
    elseif ( phase == "did" ) then
        -- Code here runs immediately after the scene goes entirely off screen
    end
end
 
 
-- destroy()
function scene:destroy( event )
 
    local sceneGroup = self.view
    -- Code here runs prior to the removal of scene's view
 
end
 
 
-- -----------------------------------------------------------------------------------
-- Scene event function listeners
-- -----------------------------------------------------------------------------------
scene:addEventListener( "create", scene )
scene:addEventListener( "show", scene )
scene:addEventListener( "hide", scene )
scene:addEventListener( "destroy", scene )
-- -----------------------------------------------------------------------------------
 
return scene