Circle

With trigonometry functions such as sine and cosine, it is very easy to compute for the value of x and y for any given radius and teta.

We've all learned this from highschool and college class and it will not be tacked in this article. However, drawing a circle using these functions requires the usage of floating-point numbers which is slow, not to mention the typecasting from floating-point to integers as plotting a pixel requires such datatype.