function love.load()
    --Object = require "classic"
    require "cjrcle"
    windowwidth = 1000
    windowheight = 1000
    love.graphics.setBackgroundColor(0, 0, 0)
    sucess = love.window.setMode(windowwidth, windowheight)

    ctheta = math.pi/2
    x = 0
    y = 0
    b = math.pi/ctheta

    sinxloc = 0
    startposX = 0
    discr = 50
    hr = 10

    speed = 1

    thrown = false -- a variable to check if the hammer has been let go

    -- hammer position
    hxpos = startposX + discr*math.cos(math.pi/2)/math.pi
    hypos = y - discr*math.sin(math.pi/2)
    nxpos = hxpos
    nypos = hypos
    rv = 1 -- rotational velocity

    --m = -hxpos/math.sqrt(50*50 - hxpos*hxpos)/discr
    --dYdX = -hxpos/math.sqrt(discr*discr - hxpos*hxpos)/discr
    dYdX = ctheta + math.pi/2
end

--[[
  equation of tangent line y = -x + 50*math.sqrt(2)
]]

function love.keypressed(key)
    if key == "space" then
        thrown = true
    end
    if key == "r" then
        b = math.pi/2
    end
end

function love.update(dt)
    --ctheta = ctheta - rv*math.pi*dt/30 -- change in theta
    --ntheta = ctheta -- theta now
    if ctheta < ctheta - 2*math.pi then
        ctheta = math.pi/2
    end
    if not thrown then
        ctheta = ctheta + math.pi/60*dt -- 2?
        hxpos = math.sin(ctheta)*discr
        hypos = math.cos(ctheta)*discr
    else
        ctheta = ctheta + math.pi/2
        hxpos = hxpos + math.sin(ctheta)
        hypos = hypos + math.cos(ctheta)
    end
    --[[
    if not thrown then
        ctheta = ctheta -rv*math.pi*dt/30
        hxpos = startposX + discr*math.cos(ctheta) -- this snippet of code calculates the hammer position for the next frame... dX/dY
        hypos = y - discr*math.sin(ctheta)
        ntheta = ctheta -- keep track of the current value of the change is theta with the current value of theta
    end
    if thrown == true then -- the tangent line is π/2 radians from ctheta
        dYdX = ctheta + math.pi/2
        ctheta = ntheta
        index = 0

        if index%2 == 0 then
            if hxpos < windowwidth/2 and hypos < windowheight/2 and hxpos > -1*windowwidth/2 and hypos > -1*windowheight/2 then
                hxpos = hxpos + 1
                hypos = hypos + dYdX
            end
        end
        if index%2 ~= 0 then
            if hxpos < windowwidth/2 or hxpos > -windowwidth/2 then
                hxpos = hxpos + 1
                hypos = hypos + dYdX
                index = index + 1
            end
        end
    end
    ]]
    local m = math.pow(2, dt)
    if love.keyboard.isDown("up") then
        b = b*m
    end
    if love.keyboard.isDown("down") then
        b = b/m
    end
end


function arccirc(r, x, y, delthe)
    arcang = math.atan(y + r/x + r)
    for theta = 0, arcang, delthe do
        love.graphics.line(discr*math.cos(theta) + x, discr*math.sin(theta) + y, discr*math.cos(theta + delthe) + x, discr*math.sin(theta + delthe) + y)
    end
end

function love.draw()

    love.graphics.translate(windowwidth/2, windowheight/2)
    love.graphics.setColor(1, 1, 0)
    love.graphics.print("sine = " .. -hypos/50, -400, -400)
    love.graphics.setColor(1, 0, 0)
    love.graphics.print("cosine = " .. hxpos/50, -400, -390)
    love.graphics.setColor(0, 0, 1)
    love.graphics.print("tangent = " .. math.tan(ctheta), -400, -380)
    love.graphics.setColor(1,.6,.5)
    love.graphics.print("cotangent = " .. 1/math.tan(ctheta),-400, -370)
    love.graphics.setColor(0,1,0)
    love.graphics.print("secant = " .. 1/math.cos(ctheta), -400, -360)
    love.graphics.setColor(1,0,1)
    love.graphics.print("cosecant = " .. 1/math.sin(ctheta) , -400, -350)
    love.graphics.setColor(1,1,1)
    love.graphics.print("b: " .. b, -400, -340)
    love.graphics.print("Ø: ".. ctheta .. " radians, or ", -400, -330 )
    love.graphics.print("which is also " .. ctheta*180/math.pi .. " degrees!", -400, -300)
    love.graphics.print("the derrivative of the quation X^2 + Y^2 = r^2 @ r = 50: ", -400, -280)
    love.graphics.print("dY/dX = -x^2/(math.sqrt(50^2 - x) + 2500) = " .. -hxpos*hxpos/(math.sqrt(discr*discr - hxpos) + 2500), -400, -260)
    love.graphics.print("tangent line has equation: ", -400, -240)
    love.graphics.print("Y = mX + b", -400, -220)
    --love.graphics.print("Y = " .. -hxpos/math.sqrt(50*50 - hxpos*hxpos)*50/50 .. "*" .. hxpos .. " + B", -400, -200)
    love.graphics.print("Y = " .. dYdX .. "*" .. hxpos .. " + B", -400, -200)
    love.graphics.print("B = " .. -dYdX, -400, -190)
    --love.graphics.print("B = " .. hxpos/math.sqrt(50*50 - hxpos*hxpos)/50, -400, -190)
    --love.graphics.print("slope m = " .. -hxpos/math.sqrt(50*50 - hxpos*hxpos)/50, -400, -170)
    love.graphics.print("Tangent line has equation:", -400, -150)
    --love.graphics.print("Y = " .. -hxpos*(math.sqrt(50*50 - hxpos*hxpos))/50 .. "X + " .. hxpos*(math.sqrt(50*50 - hxpos*hxpos))/50, -400, -130)
    love.graphics.print("Y = " .. dYdX .. "X + " .. -dYdX, -400, -130)

    love.graphics.print("The value of thrown is: ", -400, -120)
    if thrown then
        love.graphics.print("thrown!", -200, -120)
    else
        love.graphics.print("not thrown:(", -200, -120) -- thrown not being updated:()
    end
    -- orange cjrcle

    love.graphics.setColor(.7, .6, .3)
    cjrcle(discr, startposX, 0, 32)

    -- blue cjrcle for player
    love.graphics.setColor(1, 1, 1)
    cjrcle(10, hxpos, hypos)

    --orange cotangent...
    love.graphics.setColor(1,.6,.5)
    love.graphics.line(50*math.cos(ctheta), -50*math.sin(ctheta), 0, -50/math.sin(ctheta))
    -- blue tangent
    love.graphics.setColor(0, 0, 1)
    love.graphics.line(50*math.cos(ctheta), -50*math.sin(ctheta), 50/math.cos(ctheta), 0)

    --grey continued gray tangent line
    love.graphics.setColor(.5,.5,.5)
    love.graphics.line(discr/math.cos(ctheta), 0, windowwidth/2, windowwidth/2*(math.sqrt(discr*discr - hxpos*hxpos))/50)

    love.graphics.setColor(.8,.8,.8)
    love.graphics.line(discr/math.cos(ctheta), 0, windowwidth/2*(math.sqrt(discr*discr - hxpos*hxpos))/discr, windowwidth/2)

    -- secant and cosecant
    love.graphics.setColor(1, 0, 1)
    love.graphics.line(0,0,0,-50/math.sin(ctheta)) --csc
    love.graphics.setColor(1, 1, .1)
    love.graphics.setColor(0, 1, 0)
    love.graphics.line(0,0,50/math.cos(ctheta),0) --sec

    --different triangle

    --red horizontal cosine line
    love.graphics.setColor(1, 0, 0)
    love.graphics.line(0, 0, hxpos, 0)

    -- yellow vertical sine line
    love.graphics.setColor(1, 1, 0)
    love.graphics.line(hxpos, hypos, 50*math.cos(ctheta), 0)


    -- radius
    love.graphics.setColor(.5, .3, 0)
    love.graphics.line(0, 0, hxpos, hypos)

    --anglethetaprints

    love.graphics.print("Ø",hxpos/2, hypos)
    for thetarc = math.atan2(hypos,hxpos), math.sin(ctheta), -math.pi/60 do

        love.graphics.setColor(0,1,0)
        if hxpos > 0 and hypos > 0 then
            if thetarc <= math.pi/2 and thetarc > 0 then
                love.graphics.line(10*math.cos(thetarc), 10*math.sin(thetarc), 10*math.cos(thetarc + math.pi/60), 10*math.sin(thetarc + math.pi/60))
                thetarc = thetarc + math.pi/60
                --love.graphics.print("Ø",hxpos/2, hypos/2)
            end
        end

        if hxpos < 0 and hypos > 0 then
            if thetarc <= 0 and thetarc > -math.pi/2 then
                love.graphics.line(-10*math.cos(thetarc), -10*math.sin(thetarc), -10*math.cos(thetarc + math.pi/60), -10*math.sin(thetarc + math.pi/60))
                thetarc = thetarc + math.pi/60
                --love.graphics.print("Ø",hxpos/2, hypos/2)
            end
        end

    end

    --sinecurve

    sinxloc = 50
    cosyloc = 50
    love.graphics.setColor(1, 0, 0.4)
    for theta = -32*math.pi, 32*math.pi, math.pi/180 do
        love.graphics.line(25 + sinxloc, -50*math.sin(b*theta), 25 + sinxloc + math.pi/360, -50*math.sin(b*theta + math.pi/360))
        sinxloc = sinxloc + 1
        cosyloc = cosyloc + 1
    end

    love.graphics.setColor(1,0,0)
    love.graphics.print("x: " .. hxpos/50, hxpos - 50, hypos)
    love.graphics.print("y: " .. -hypos/50, hxpos - 50, hypos+10)
end