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• Lua Cheat Sheet for Programmers

• bal = ui_scalar('Bal/diameter (mm)', 239, 0, 600) → 1e veld is text/label, default waarde, minimum waarde, max waarde)
• emit(object) → tekenen van Object 'dhoek'
• difference(objetA,objectB) → wegsnijden van objecte adv object.
• emit(translate(0,0,0)*ring) → op een specifieke plaats tekenen van het object
• print(“Here is a string” .. ' concatenated with ' .. 2 .. ' other strings.') → om text te printen/tussentijdse feedback

L = 160 
H = 200 

D = 83/2   
Db = D + 4 

dikte = 20 
-- weergeven variable waarde
v1 = ui_scalar('.A', 0, 0, 300)
v2 = ui_scalar('.B', 0, 0, 300)
v3 = ui_scalar('.C', 0, 0, 300)
v4 = ui_scalar('.D', L, 0, 160)
v5 = ui_scalar('.E', H, 0, 200)
v6 = ui_scalar('.F', (L/2), 0, 80)

triangle = { v(v1,v2), v(v3,v4), v(v5,v6) }

dir = v(0,0,dikte)

dhoek = linear_extrude(dir, triangle)
emit(dhoek)

hoogte = 40

buitenring = cylinder(160,hoogte)
binnenring = cylinder(100,hoogte)

ring = difference(buitenring,binnenring)

emit(ring)

bringbuitenrand = 92 /2
bringbinnenrand = 35 /2
kegellengte = 30
bringdikte = 50




-- DEEL 1 (Platte ring)
--*******************************************
bevestigingsring = difference(cylinder(bringbuitenrand,bringdikte),
           cylinder(bringbinnenrand,bringdikte)
          )

--emit(bevestigingsring)

-- DEEL 2 (kegel)
--*******************************************
kegel = cone(bringbuitenrand, bringbinnenrand, kegellengte)


--emit(kegel)

-- DEEL 3 (Ring - kegel)
--*******************************************
emit(difference(bevestigingsring,kegel))

-- Lua Cheat Sheet for Programmers, by Al Sweigart http://coffeeghost.net
-- This cheat sheet is an executable Lua program.
--[[ This is
a multline comment]]

---[[ This is a neat trick. The first -- makes -[[ not a multiline comment.
print("This line executes.")
--]] The rest of this line is also a comment.

print("Here is a string" .. ' concatenated with ' .. 2 .. ' other strings.')

-- Note: All number types are doubles. There're no integers.
print(type(42), type(42.0)) -- prints out "number  number"
variable_one = 1 + 2 - 3 -- This will equal zero.
variable_One = "Variables are case sensitive."
negative_twofiftysix = -2^8

a, b = 42, 101 --mulitple assignment
a, b = b, a    --provides a nice value swap trick
x, y, z = 1, 2, 3, "this value is discarded"

print(previously_unused_variable == nil) -- prints true, all vars start as nil
print(nil == 0 or nil == "") -- prints false, nil is not the same as false or 0
print('The # len operator says there are ' .. #'hello' .. ' letters in "hello".')

some_bool_variable = true and false or true and not false

a_table = {['spam'] = "Type something in:", ['eggs'] = 10} -- tables are dictionaries/arrays
print(a_table['spam'])

what_the_user_typed_in = io.read()
print('You typed in ' .. what_the_user_typed_in)

if 10 < 20 then
	print( "apple" == "orange" ) -- prints false
	print( "apple" ~= "orange" ) -- true, an apple is not equal to an orange
    local foo
    foo = 42
    print(foo)
elseif 50 < 100 then
	--These clauses can contain no lines of code.
end
print(foo) -- prints nil, local foo exists only in that "if" block above

m = 0
while m < 10 do
	print("howdy " .. m)
	m = m + 1 -- there is no m++ or m += 1
    repeat
        print("Repeat loops check the condition at end, and stops if it is true.")
        break -- breaks out of the loop early
    until m == 9999
end

for i = 1, 10 do
    for j = 1, 10, 2 do
        print("for loops add 1 to i and 2 to j each iteration " .. i .. ' ' .. j)
    end
end

function Greet(name)
	print('Hello ' .. name)
	bar = 100
	return "returns nil if you don't have a return statement."
end
Greet('Al Sweigart')
print(bar) -- prints 100