basic

_G["basic"] = {}

function basic.drawPixel(x,y,spec)
  if not math.floor(x) then
    error("Got "..type(x)..". Number is expected")
  elseif not math.floor(y) then
    error("Got"..typer(y)..". Number is expected")
  end
  local x = math.floor(x)
  local y = math.floor(y)
  if not spec then
    term.setCursorPos(x,y)
    write("#")
    return true
  elseif spec == true then
    paintutils.drawPixel(x,y,colors.white)
    return true
  end
  return false
end
function basic.drawLine(x1,y1,x2,y2,spec)
  if spec then
    paintutils.drawLine(x1,y1,x2,y2,colors.white)
    return true
  end
  local x1 = math.floor(x1)
  local x2 = math.floor(x2)
  local y1 = math.floor(y1)
  local y2 = math.floor(y2)
  local minX = math.min(x1,x2)
  local maxX = math.max(x1,x2)
  local minY = math.min(y1,y2)
  local maxY = math.max(y1,y2)
  local difX = maxX - minX
  local difY = maxY - minY
  if x1 == x2 then
    if y1 == y2 then
      basic.drawPixel(x1,y1)
    else
      for ypos = minY,maxY do
        basic.drawPixel(x1,ypos)
      end
    end
    return true
  end
  for xpos = minX,maxX do
    local ypos = minY + difY * (xpos - minX) / difX
    basic.drawPixel(xpos,ypos)
  end
  return true
end

function basic.drawBox(x1,y1,x2,y2,spec)
  if spec then
    paintutils.drawBox(x1,y1,x2,y2,colors.white)
    return true
  end
  basic.drawLine(x1,y1,x2,y1)
  basic.drawLine(x1,y1,x1,y2)
  basic.drawLine(x2,y2,x1,y2)
  basic.drawLine(x2,y2,x2,y1)
  return true
end

function basic.drawFilledBox(x1,y1,x2,y2,spec)
  if spec then
    paintutils.drawFilledBox(x1,y1,x2,y1,colors.white)
    return true
  end
  local maxY = math.max(y1,y2)
  local minY = math.min(y1,y2)
  for i =minY,maxY do
    basic.drawLine(x1,i,x2,i)
  end
  return true
end