Polar Coordinates and NaN errors

Questions
21

@dave1707 thanks! I’ll post an image of your rocket in use in the game I’m making. Here are the changes I made to your code so that it suits the style of my game, I’m very happy with how it’s turned out.


--# Main
-- Rocket V3

displayMode(FULLSCREEN)

function setup()
    mx,my=0,0
    x,y=WIDTH/2,0
    vx,vy=0,1
    speed=4
    gas = {}
    --backingMode(RETAINED)
end

function draw()
    aim = vec2(vx,vy)
    
    angle = angleMachine(aim)
    
    background(0)
    
    fumes(x,y)
    
    
    
    
    fill(255)
    
    pushMatrix()
    
    translate(x,y)
    
    
    
    rotate(-angle)

    
    rect(-5,-15,10,30)
    popMatrix()
    
    
    if px~=nil then
        fill(255,0,0)
        ellipse(px,py,10)
        dx=px-x
        dy=py-y
        if not hit then
            move()
            if math.abs(dx)<3 and math.abs(dy)<3 then
                hit=true
            end
        end
    end
    x=x+vx*speed
    y=y+vy*speed
    
    
    
    
    
    
    
end

function move()
    v1=vec2(dx,dy)
    v1=v1:normalize()
    if vx<v1.x then
        vx=vx+speed*.005
    else
        vx=vx-speed*.005
    end
    if vy<v1.y then
        vy=vy+speed*.005
    else
        vy=vy-speed*.005
    end
end

function touched(t)
    if t.state==BEGAN then
        px=t.x
        py=t.y
        hit=false
    end
end


function angleMachine(aim)
    angle = math.deg(math.atan(aim.x/aim.y))
    if aim.x > 0 and aim.y > 0 then
        angle = angle
    elseif aim.x > 0 and aim.y < 0 then
     
        angle = 180 + angle
    elseif aim.x < 0 and aim.y < 0 then
        
        angle = 180 + angle
    
    elseif aim.x < 0 and aim.y > 0 then
        
        angle = 360 + angle
    
    end
    
    return angle 
 end   
    
function fumes(xx,yy)
    
   randomNum = math.random(1,10)
    
   if randomNum > 5 then
    
    table.insert(gas,Smoke(xx,yy))
        
   end
    
    for a,b in pairs(gas) do 

    b:draw()
    
    if b.status == "delete" then
    
    table.remove(gas)
            
            
    
        end
        
        
    
    end
      
end
    
    
--# Smoke
Smoke = class()

function Smoke:init(xx,yy)
    
    -- you can accept and set parameters here
    self.startPos = vec2(xx,yy)
    
    self.radius = math.random(1,30)
    self.alpha = 255
    self.angle = angle
    self.timer = 0
    self.status = "alive"
    
    
    pushMatrix()
    
    translate(x,y)
    
    rotate(-angle)
    
    fill(255,0,228,255)
    
    ellipse(0,-15,self.radius)
    
    popMatrix()
    
end

function Smoke:draw()
    self.r = math.random(1,255)
    self.g = math.random(1,255)
    self.b = math.random(1,255)
    
    
    pushMatrix()
    
    translate(self.startPos.x,self.startPos.y)
    
    rotate(-self.angle)
    
    
    
    
    self.alpha = self.alpha*0.97
    fill(self.r, self.g,self.b, self.alpha)
    ellipse(0,-15,self.radius)
    popMatrix()
    
    self.timer = self.timer + 1
    
    if self.timer > 800 then
        self.status = "delete"
    end
    
end