Boss

Boss.lua

--# Main
World = class()

function World:init()
    self.instances={}
    self.width=1024
    self.height=768
    self.index=0
end

function World:update()
    for i,obj in ipairs(self.instances) do
        self.index=i
        --for j,other in ipairs(self.instances) do
        --end
        obj:update()
    end
end

function World:draw()
    background(0, 0, 0, 255)
    for i,obj in ipairs(self.instances) do
        self.index=i
        obj:draw()
    end
end

function World:add(inst)
    table.insert(self.instances,inst)
end

function World:remove()
    table.remove(self.instances,self.index)
end

function setup()
    displayMode(FULLSCREEN)
    world=World()
    for i=1,200 do
        world:add(Star())
    end
    ship=Ship(400,300)
    world:add(ship)
    boss=Boss(200,HEIGHT-200)
    world:add(boss)
end

function draw()
    world:update()
    world:draw()
end

--# Star
Star = class()

function Star:init()
    self.x = math.random(WIDTH)
    self.y = math.random(HEIGHT)
    self.size=math.random()
end

function Star:update()
    -- Codea does not automatically call this method
    self.y = self.y - 11*self.size
    if self.y<0 then
        self.y = self.y + HEIGHT
        self.x = math.random(WIDTH)
    end
end

function Star:draw()
    -- Codea does not automatically call this method
    fill(255, 255, 255, self.size*255)
    ellipse(self.x,self.y,5*self.size,5*self.size)
end
--# Ship
Ship = class()

function Ship:init(x,y)
    self.x = x
    self.y = y
    self.counter=40    --this number is a timer for shooting.
end

function Ship:update()
    self.px=self.x
    self.py=self.y
    self.x = self.x + Gravity.x*20
    self.y = self.y + (Gravity.y+0.2)*18
    --if self.y>HEIGHT/3 then
    --    self.y=HEIGHT/3
    --end
    self.counter = self.counter + 1
    if self.counter>=30 then
        --sound(SOUND_SHOOT, 47057)
        self.counter=0
        local bullet=ShipBullet(self.x,self.y)
        world:add(bullet)
    end
end

function Ship:draw()
    if math.abs(Gravity.x)<.05 then
        sprite("Tyrian Remastered:Ship C",self.x,self.y)
    elseif Gravity.x<0 then 
        sprite("Tyrian Remastered:Ship C L1",self.x,self.y)
    else
        sprite("Tyrian Remastered:Ship C R2",self.x,self.y)
    end
end


--# ShipBullet
ShipBullet = class()

function ShipBullet:init(x,y)
    self.x=x
    self.y=y
end

function ShipBullet:update()
    self.y = self.y + 16
    if self.y>world.width then
        world:remove()
    end
    if math.sqrt(math.pow((boss.x-self.x),2)+math.pow((boss.y-self.y),2))<80 then
        world:add(Explosion(self.x,self.y))
        sound(SOUND_EXPLODE, 25890)
        world:remove()
    end
end

function ShipBullet:draw()
    sprite("Tyrian Remastered:Bullet Fire A",self.x,self.y)
end
--# Boss
Boss = class()

function Boss:init(x,y)
    self.x=x
    self.y=y
    self.vel=2
    self.counter=20
    self.side=1
end

function Boss:update()
    self.x = self.x + (ship.x-self.x)/40
    self.counter = self.counter + 1
    if self.counter>=40 then
        --sound(SOUND_SHOOT, 47057)
        self.counter=0
        local bullet=BossBullet(self.x+(self.side*48),self.y-64)
        world:add(bullet)
        self.side=-self.side
    end
end

function Boss:draw()
    sprite("Tyrian Remastered:Boss B",self.x,self.y)
end
--# Explosion
Explosion = class()

function Explosion:init(x,y)
    -- you can accept and set parameters here
    self.x = x
    self.y = y
    self.life=20
end

function Explosion:update()
    -- Codea does not automatically call this method
    self.y = self.y - 2
    self.life = self.life - 1
    if self.life<0 then
        world:remove()
    end
end

function Explosion:draw()
    pushStyle()
    tint(255, 255, 255, 255*(self.life/20))
    sprite("Tyrian Remastered:Bullet Fire C",self.x,self.y)
    popStyle()
end

--# BossBullet
BossBullet = class()

function BossBullet:init(x,y)
    self.x = x
    self.y = y
    self.vel=-10
end

function BossBullet:update()
    self.x = self.x + (ship.x-self.x)/30
    self.vel = self.vel - .1
    self.y = self.y + self.vel
    if (self.y<-100) then
        world:remove()
    end
    if math.sqrt(math.pow((ship.x-self.x),2)+math.pow((ship.y-self.y),2))<30 then
        world:add(BigExplosion(self.x,self.y))
        sound(SOUND_EXPLODE, 25880)
        world:remove()
    end
end

function BossBullet:draw()
    sprite("Tyrian Remastered:Flame 1",self.x,self.y)
end

--# BigExplosion
BigExplosion = class()

function BigExplosion:init(x,y)
    -- you can accept and set parameters here
    self.x = x
    self.y = y
    self.life=20
end

function BigExplosion:update()
    -- Codea does not automatically call this method
    self.y = self.y - 8
    self.life = self.life - 1
    if self.life<0 then
        world:remove()
    end
end

function BigExplosion:draw()
    pushStyle()
    tint(255, 255, 255, 255*(self.life/20))
    sprite("Tyrian Remastered:Explosion Huge",self.x,self.y)
    popStyle()
end