ez.Arc doesn't always render an arc

[JacobChrist]

Describe the bug
The attached code should generate 16 small arcs around a circle (every 1024 ez-degrees). However some positions (angles are not rendered, namely: 2048, 4096+2048, 2^13-2048, 2^13+2048)

To Reproduce
Run the attached code on a 5035.

Expected behavior
All arcs should be rendered.

Screenshots

• Note image colors are incorrect due to issue ez.SdScreenCapture() does not work as expected #79

MANDATORY: Attachments

----------------------------------------------------------------------
-- ezLCD Meter
--
-- Exampel Code for testing AMeter Widget
--
-- Created  05/02/2023  -  Jacob Christ
----------------------------------------------------------------------
gAppName = "EarthLCD Meter Demo Application"

----------------------------------------------------------------------
-- Serial Port Debug Code
----------------------------------------------------------------------
debug_port = 0
-- Event Handelers
-- Serial Port Event
function DebugPortReceiveFunction(byte)
	ez.SerialTx(byte, 1, debug_port)
end

function DebugSetup(applicatin_name)
	-- open the RS-232 port
	ez.SerialOpen("DebugPortReceiveFunction", debug_port)
	ez.SerialTx("**********************************************************************\r\n", 80, debug_port)
	ez.SerialTx("* " .. applicatin_name .. "\r\n", 80, debug_port)
	ez.SerialTx("**********************************************************************\r\n", 80, debug_port)
	ez.SerialTx(ez.FirmVer .. "\r\n", 80, debug_port)
	ez.SerialTx(ez.LuaVer .. "\r\n", 80, debug_port)
	ez.SerialTx("S/N: " .. ez.SerialNo .. "\r\n", 80, debug_port)
	ez.SerialTx(ez.Width .. "x" .. ez.Height .. "\r\n", 80, debug_port)
	ez.SerialTx("Frames: " .. ez.NoOfFrames .. "\r\n", 80, debug_port)
end

----------------------------------------------------------------------
-- Button Processing Code
----------------------------------------------------------------------

-- Define the Button Event Handler
function ProcessButtons(id, event)
	-- TODO: Insert your button processing code here
	-- Display the image which corresponds to the event
	if id == 0 and event == 1 then
		screen_change = true
		screen = id
		if screen > screen_max then
			screen = 0
		end
		str = "screen=" .. tostring(screen)
		ez.SerialTx(str .. "\r\n", 80, debug_port)
	end

	ez.Button(id, event)
	str = "id=" .. tostring(id) ..  ", event=" .. tostring(event)
	ez.SerialTx(str .. "\r\n", 80, debug_port)
end 

function ButtonSetup()
	-- Setup button(s)
	ez.Button(0, 1, -1, -11, -1, 0,  0, 50, 50) -- Screen capture
	-- ez.Button(2, 1, -1, -11, -1, 0, 0, 50, 40)     -- Menu
	-- ez.Button(3, 1, -1, -11, -1, 0, 80, 320, 150)  -- Plot Area

	-- Start to receive button events
	ez.SetButtonEvent("ProcessButtons")
end

-----------------------------------------------------------------------------
-- LCD printBox
-----------------------------------------------------------------------------
-- x1, y1: Upper left location of printBox
--
-- x2: Upper right location of printBox
--
-- fg: Foreground color
--
-- bg: Background Color
--
-- font_height: Height of box in pixes (actual font height is 70% of this number)
function printBox(x1, y1, x2, fg, bg, font_height, str) 
	-- Erase Old Weight
	local y2 = y1 + font_height

	ez.BoxFill(x1,y1, x2,y2, bg) -- X, Y, Width, Height, Color

	-- Display Line
	ez.SetColor(fg)
	ez.SetFtFont(fn, math.floor(font_height * 0.70)) -- Font Number, Height, Width
	ez.SetXY(x1, y1)
	print(str)
end


fn = 14
font_height = 240 / 8 -- = 30
screen = -1
screen_max = 2
screen_change = true


-----------------------------------------------------------------------------
-- Main
-----------------------------------------------------------------------------
function mainFunction()
	DebugSetup(gAppName)
	ButtonSetup()

	ez.Cls(ez.RGB(0,0,0))
	printBox(  0, 0, 160, ez.RGB(0xff, 0xff, 0xff), ez.RGB(0x00, 0x00, 0x80),font_height, "Hello")
	printBox(160, 0, 320, ez.RGB(0xff, 0xff, 0xff), ez.RGB(0x80, 0x00, 0x00),font_height, "World")

	local x = 160
	local y = 120
	local r = 70

	ez.SetPenSize(10, 10)

	ez.CircleFill(x, y, r, ez.RGB(0x80, 0x00, 0x80))

	ez.SetColor(ez.RGB(0x00, 0x80, 0x00))
	ez.AMeter(x, y, r, 0, 8192)

	ez.SetColor(ez.RGB(0x00, 0x80, 0x80))
	ez.AMeter(x, y, r, 4096, 8192+4096)

	ez.SetColor(ez.RGB(0xff, 0xff, 0xff))
	local theta_start = 0
	local theta_stop = 16384
	local theta_step = (theta_stop - theta_start) / 16
	local tick_width = 1
	for theta = theta_start, theta_stop, theta_step
	do
		str = string.format("%0.1f", theta)
		printBox(0, 1 * font_height, 100, ez.RGB(0xff, 0xff, 0xff), ez.RGB(0x80, 0x80, 0x00), font_height, str)
		if theta + tick_width <= 16384 then
			ez.Arc(x, y, r, math.floor(theta), math.floor(theta) + tick_width)
			ez.Wait_ms(500) -- Wait 5 seconds
		end
	end

	ez.Wait_ms(1000) -- Wait 5 seconds
	-- ez.SdScreenCapture()
	-- ez.SetPinOut(100)

	while 1 do
		if screen_change == true then
			if screen == 0 then
				ez.SdScreenCapture()
			end
			screen_change = false
		end
	end
end

function errorHandler(errmsg)
	local str

	font_height = 240 / 16 -- = 60

	str = debug.traceback()
	printBox(0, 8 * font_height, 320, ez.RGB(0xff, 0xff, 0xff), ez.RGB(0x80, 0x00, 0x80), font_height, str)
	ez.SerialTx(str .. "\r\n", 80, debug_port)

	str = errmsg
	printBox(0, 0 * font_height, 320, ez.RGB(0xff, 0xff, 0xff), ez.RGB(0x80, 0x00, 0x00), font_height, str)
	ez.SerialTx(str .. "\r\n", 80, debug_port)
end

-- errorHandler function demo
-- illegal command ez.SetPinOut(100) will print out to ezLCD Display
-- Note: using this command will turn off the regular error messages to the Lua console

-- Call mainFunction() protected by errorHandler
rc, err = xpcall(function() mainFunction() end, errorHandler)

[JacobChrist]

I may work on fixing this one after I finish my current task.