For example, we want a polygon to draw a elephant to do this, take an ordinary sheet of paper in the box
Draw a line through the two lines which will intersect in the center ...
In the screenshot I showed all the points that we need to ensure that our elephant appeared
to do this, draw an elephant ...in General, look at the screen
Each point of elephant is highlighted in red, these points are numbered here and take them and write on a piece of paper separately starting at 0 in this order ...
where a is point of X
where b is point of Y
Of course for bolovstvo can be drawn and the polygons, and even something interesting but there are vector editors ..type Inkscape Corel Draw Illustrator Gravit OpenOffis Draw and this can be done easily ...if that not clearly ask