# 1.3 Game 2302-0110: updating the game math library for graphics  (Page 9/20)

 Page 9 / 20
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.

where we get a research paper on Nano chemistry....?
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
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