rotation control

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a little program to check how to know the angle the ipad is looking to. Integrating RotationRate is more accurate than i thought it would be.


--# Main
-- test RotationRate
backingMode(RETAINED)

-- Use this function to perform your initial setup
function setup()
    drawAngle()
end

local angle = 0
local rotGain = 1
function updateAngle()
    local rz = RotationRate.y * DeltaTime * 60
    angle = angle + rz * rotGain
end

local lastx,lasty, offset, gain, x,y
function drawAngle(v)
    if v then
        -- draw new point
        x = lastx + 1
        y = v * gain + offset
        if x > WIDTH then 
            x = 0 
        else
            stroke(255, 0, 28, 255)
            strokeWidth(3)
            line(lastx, lasty, x, y)
        end
        lastx,lasty = x, y
    else
        -- init
        offset = HEIGHT/2
        gain = HEIGHT/2/180
        lastx,lasty = 0, offset
        background(40, 40, 50)
        drawScale()
    end
end

function drawScale()
    local ox,oy = 0, HEIGHT/2
    local gx, gy = 1, HEIGHT/2/180
    local xmax = WIDTH/gx - ox
    local function rline(x,y,z,t) line( x*gx+ox, y*gy+oy, z*gx+ox, t*gy+oy) end
    local function rtext(str,x,y) text( str, x*gx+ox, y*gy+oy) end
    stroke(164, 164, 164, 255)
    strokeWidth(2)
    rline(5,-180,5,180)
    for i = -180,180,90 do
        rline(0,i,xmax,i)
    end
    for i = -180,180,30 do
        rline(0,i,10,i)
        rtext(tostring(i),30,i)
    end
    rtext("Rotation angle in Horizontal plane (hold iPad vertically)", xmax/2, 160)
end

function fpsKiller()
    dummy = 0 -- this is a test to kill the fps and check the angle is still ok
    for i=1,10 do dummy = dummy + 1 end
end

-- This function gets called once every frame
function draw()
  --  drawPoint(RotationRate.y)
    updateAngle()
    drawAngle(angle)
    
    fpsKiller()
end