Connectors draws various types of connector including.
AC wall outlet
USB2-A female
USB3-A female
RJ-11
RJ-45
MIDI DIN
VGA male
RS232C 9-pin and 25-pin male and female
It displays the result magnified on screen and creates *.png files.
You can use its techniques to draw your own connectors. You can use its practical examples
to learn how to use the Swing drawing classes such as:
AffineTransform, Area, BasicStroke, BufferedImage, Ellipse2D,
FontRenderContext, Graphics2D, ImageIO, JFrame, JPanel, LineMetrics,
Polygon, Rectangle, RenderingHints, RoundRectangle2D and Shape.
Java source is included for you to cannibalise, particularly
RoundedPolygons to computer, draw and fill rounded polygons (triangles,
irregular shaped bounded by lines).  To understand the math see the
diagram in roundedcornermath.png.