|
#!/usr/bin/luajit
package.path = "../LjES/?.lua;" .. package.path
local demo = require("demo")
demo.screen(0, 0)
local aSpace = demo.getSpace()
local eye = aSpace:addNode(nil, "eye")
eye:setPosition(0, 0, 30)
demo.backgroundColor(0.2, 0.2, 0.4)
local shape = Shape:new()
shape:donut(8, 3, 16, 16)
shape:endShape()
shape:shaderParameter("color", {1.0, 0.5, 0.6, 1.0})
local node = aSpace:addNode(nil, "node1")
node:setPosition(0, 0, 0)
node:addShape(shape)
local data = {}
function std(data)
local sum = 0
local sum2 = 0
local N = #data
local M = N - 1
for i=1, N do
sum = sum + data[i]
sum2 = sum2 + data[i] * data[i]
end
local avg = sum / N
local std = math.sqrt(sum2 / M - sum * sum / (N*M) )
return avg, std
end
local draw_count = 0
function draw()
local now = util.now()
draw_count = draw_count + 1
if draw_count > 10 then
table.insert(data, now)
end
node:rotateX(0.1)
aSpace:draw(eye)
end
demo.loop(draw, true)
util.printf("No of data :%d\n", #data)
local data2 = {}
for i = 2, #data do
table.insert(data2, data[i]-data[i-1])
end
local avg, std = std(data2)
util.printf("avg = %15.12f, std = %15.12f \n", avg, std)
demo.exit()
|
