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Drawing the polygon (or the polyline)

Getting back to the Java code in Listing 11 , you can insert any number (two or more) of x-y coordinate-pairs inside the curly brackets (but you must insert them in pairs) . Line segments will be drawn from the first coordinate location to the second, from the second tothe third, and so on. (Of course there need to be two or more coordinate pairs in order for things to make sense.)

If you examine the coordinate values shown in Listing 11 , you will see that they define the vertices of a triangle whose base is parallel to thehorizontal axis. Since this is a polygon, it will be drawn as a closed triangle with lines for all three sides. If it were a polyline, it would not be drawn asa closed triangle. Instead, only two lines would be drawn and the third side of the triangle would be open.

SVG code to draw a polygon

Listing 12 shows the SVG code produced by the Java code in Listing 11 .

Listing 12 . SVG code to draw a polygon.
<polygon stroke="black" stroke-width="1" fill="none" points="675 675 855 675 765 540 "><title>polygon</title></polygon>

The attribute named points

The polygon element in Listing 12 contains a new attribute name that you haven't seen before: points .

As you have probably figured out by now, the value of the attribute named points is aseries of numeric values, separated by spaces, that represent the x-y coordinate pairs in Listing 11 , converted from inches to SVG units.

Hopefully by now you are beginning to see patterns that relate the Java code to the resulting SVG code.

Draw the rectangular pulley support

The drawing in Figure 2 shows a pulley connected to the rightmost end of the table. The drawing of the pulley consists of a rectangle as the support memberand a circle as the pulley wheel. The Java code to draw the pulley support is shown in Listing 13 .

Listing 13 . Draw the rectangular pulley support.
//Draw pulley support Element pullySupport = SvgLib21.makeRect(svg,ns, "rectangle",7.883, 3.595,0.392, 1.06);

The Java code in Listing 13 simply draws another rectangle, so it shouldn't need further explanation.

Draw a circle

The Java code in Listing 14 draws a circle to serve as the pulley wheel in the drawing.

Listing 14 . Draw a circle.
//Draw the pulley wheel. Element pulleyWheel = SvgLib21.makeCircle(svg, ns,"circle", 8.05, //x-coordinate of center of circle4.56, //y-coordinate of center of circle 0.45 //radius of circle);

What are you allowed to change?

There are only four things that you are allowed to change in the code in Listing 14 :

  1. The name of the circle object, which is pulleyWheel in Listing 14 .
  2. The title ( "circle" in Listing 14 ) .
  3. The value of the x-coordinate of the center of the circle.
  4. The value of the y-coordinate of the center of the circle.
  5. The radius of the circle.

You will need to examine the coordinate values for the center of the circle along with the radius of the circle and imagine how the position and size of thecircle relates to the right end of the table top in Figure 2 . (Or hopefully, get a tactile version of the drawing and explore it by touch.)

Questions & Answers

I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
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
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
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
How can I make nanorobot?
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Mueller Reply
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Source:  OpenStax, Accessible physics concepts for blind students. OpenStax CNX. Oct 02, 2015 Download for free at https://legacy.cnx.org/content/col11294/1.36
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