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Listing 10 . The draw method of the GM2D02.Point class.
public void draw(Graphics2D g2D){ Ellipse2D.Double circle =new Ellipse2D.Double(getData(0)-3, getData(1)-3,6, 6);g2D.draw(circle); }//end draw

The logic behind this method is very similar to the logic that I explained relative to Listing 8 . The constructor for the Java standard Ellipse2D.Double class requires four incoming parameters that specify the coordinates of the upper-left corner of a rectangle followed by thewidth and the height of the rectangle. The new object of type Ellipse2D.Double represents an ellipse that is bounded by the four sides of the rectangle. If therectangle is square, the ellipse becomes a circle.

(In this case, the rectangle is a 6x6 square, thus producing a circle with a diameter of six pixels.)

Listing 10 calls the draw method of the Graphics2D class to render the ellipse (circle) at the specified location on the graphics context specified by the incoming parameter. Thus the code in Listing 9 produces a visual manifestation of a point at the origin of the current coordinate frame.The visual manifestation consists of a small circle centered on the location of the point, resulting in the small circle at the center of the left image in Figure 1 .

Draw the vertices of a hexagon

Returning once more to the drawOffScreen method of the program named PointLine03 , Listing 11 instantiates six GM2D02.Point objects that represent the vertices of a hexagon that is symmetrically located relative to the origin inthe current coordinate frame

Listing 11 . Draw the vertices of a hexagon.
//First define three constants to make it easier to // write the code.final double aVal = osiWidth/4.0*0.5; final double bVal = osiWidth/4.0*0.866;final double cVal = osiWidth/4.0; //Now define the points.GM2D02.Point point0 = new GM2D02.Point( new GM2D02.ColMatrix(cVal,0.0));GM2D02.Point point1 = new GM2D02.Point( new GM2D02.ColMatrix(aVal,bVal));GM2D02.Point point2 = new GM2D02.Point( new GM2D02.ColMatrix(-aVal,bVal));GM2D02.Point point3 = new GM2D02.Point( new GM2D02.ColMatrix(-cVal,0.0));GM2D02.Point point4 = new GM2D02.Point( new GM2D02.ColMatrix(-aVal,-bVal));GM2D02.Point point5 = new GM2D02.Point( new GM2D02.ColMatrix(aVal,-bVal));//Now draw a visual manifestation of each of the six// points on g2Da. point0.draw(g2Da);point1.draw(g2Da); point2.draw(g2Da);point3.draw(g2Da); point4.draw(g2Da);point5.draw(g2Da);

Then Listing 11 calls the draw method of the GM2D02.Point class six times in succession to cause small circles that represent the six points to be rendered on the specified off-screen image. You can seethose six circles in the left image in Figure 1 .

Draw six lines connecting the vertices of the hexagon

Listing 12 instantiates six objects of the GM2D02.Line class whose endpoints are specified by the six GM2D02.Point objects from Listing 11 , taken in pairs.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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