Rocket-Bytes/Source/Saws.lua

import "CoreLibs/animator"
local gfx <const> = playdate.graphics

local imgSaw = gfx.image.new("gfx/sawblade")
local imgTarget = gfx.image.new("gfx/target")
assert(imgSaw)
assert(imgTarget)

local blades = {}

function loadBlades(_blades)
    for i = 1, #_blades,1 do
        local b = _blades[i]
        b.start = playdate.geometry.point.new(b.start.x,b.start.y)
        b.ends = playdate.geometry.point.new(b.ends.x,b.ends.y)
        b.saw = gfx.sprite.new(imgSaw)
        b.saw:moveTo(b.start)
        b.saw:setCollideRect(0,0,16,16)
        b.saw:add()

        local a = gfx.animator.new(b.speed*1000, b.start, b.ends)

        b.saw:setAnimator(a)

        b.t1 = gfx.sprite.new(imgTarget)
        b.t1:moveTo(b.start)
        b.t2 = gfx.sprite.new(imgTarget)
        b.t2:moveTo(b.ends)
        b.t1:add()
        b.t2:add()
        blades[i] = b
    end
end

function loadSpins(_spins)
    for i = 1, #_spins, 1 do
        local s = _spins[i]
        if s.middle then
            s.middle = gfx.sprite.new(imgSaw)
            s.middle:setCollideRect(0,0,16,16)
        else
            s.middle = gfx.sprite.new(imgTarget)
        end
        s.middle:moveTo(s.x,s.y)
        s.middle:add()

        for i = 1, s.arms, 1 do
            for p = 1, s.armlen, 1 do
                local degrees =  (360 / s.arms) * p
                local position = {x=math.sin(math.rad(degrees)) * 20 * i,y=math.cos(math.rad(degrees)) * 20 * i}

                local newSpr = gfx.sprite.new(imgSaw)
                newSpr:moveTo(s.x + position.x, s.y + position.y)
                newSpr:add()
            end
        end
    end
end

function updateSaws()
    for b=1, #blades, 1 do
        b = blades[b]
        local pos = playdate.geometry.point.new(b.saw:getPosition())
        if pos == b.start then
            local a = gfx.animator.new(b.speed*1000, b.start, b.ends)

            b.saw:setAnimator(a)
        elseif pos == b.ends then
            local a = gfx.animator.new(b.speed*1000, b.ends, b.start)

            b.saw:setAnimator(a)
        end
    end
end

function killBlades()
    for i = 1, #blades, 1 do
        blades[i].t1:remove()
        blades[i].t2:remove()
        blades[i].saw:remove()
    end
    blades = {}
end