Nitro circles

[cosmicfloppydisk]

Okay, okay, circles are simple, but I've never shared any of my programs and I think this could be a useful contribution to the nitro library examples folder( *wink* *wink* 😉)

--[[ Circle
 Nitro Library Required ]]

g = require 'nitro.graphics'

-- start graphics screen
g.showscreen()

-- now graphics commands are avialable

local w, h = g.getscreensize()
-- vertex color
local c = {1, 0, 0, 1}

-- location for circle
local centerX = w/2
local centerY = h/2
local radius = 50

-- temporarily holds our vertices
local verts = {}

for i = 1, 360 do
  local angle = i * math.pi / 180
  local ptx, pty = centerX + radius * math.cos( angle ), centerY + radius * math.sin( angle )

  table.insert(verts, {{ptx,pty}, c})
end

-- create vertex table from the 'verts' table
new_vt = g.newvt{ v = verts, vf = 'p2c4'}

-- create vertex buffer object
local circle = g.newvbo{
  vt = new_vt
}

g.trianglefan{vbo = circle}

g.present()

sys.halt()

[cosmicfloppydisk]

Then I realize there's a outlined circle function in the spaceship example 😭

[Guy]

Lmao, but ayy, at least the more examples, the better

[Admin]

Apr 21, 2017 22:33:44 GMT cosmicfloppydisk said:

Okay, okay, circles are simple, but I've never shared any of my programs and I think this could be a useful contribution to the nitro library examples folder( *wink* *wink* 😉)

--[[ Circle
 Nitro Library Required ]]

g = require 'nitro.graphics'

-- start graphics screen
g.showscreen()

-- now graphics commands are avialable

local w, h = g.getscreensize()
-- vertex color
local c = {1, 0, 0, 1}

-- location for circle
local centerX = w/2
local centerY = h/2
local radius = 50

-- temporarily holds our vertices
local verts = {}

for i = 1, 360 do
  local angle = i * math.pi / 180
  local ptx, pty = centerX + radius * math.cos( angle ), centerY + radius * math.sin( angle )

  table.insert(verts, {{ptx,pty}, c})
end

-- create vertex table from the 'verts' table
new_vt = g.newvt{ v = verts, vf = 'p2c4'}

-- create vertex buffer object
local circle = g.newvbo{
  vt = new_vt
}

g.trianglefan{vbo = circle}

g.present()

sys.halt()

You can create vbo directly
circle = g.newvbo{v = vert, vf = 'p2c4'}

[cosmicfloppydisk]

I just give up now