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Run the program

Before continuing, I suggest that you run the program named AppBackground01 to familiarize yourself with the screen output.

The Flex 3 version

The mxml file

An XML listing for the Flex 3 application named AppBackground01 is shown in Listing 2.

Flex 3 application namedappbackground01.

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"backgroundColor="#FF0000" backgroundGradientColors="[#00FF00, #0000FF]" backgroundAlpha="1.0"></mx:Application>

Background color, color gradient, and transparency

The output for this application is similar to that shown in Figure 2 except that in this case, the color, color gradient, and transparency for thebackground is being controlled through the use of the following attributes:

  • backgroundColor
  • backgroundGradientColors
  • backgroundAlpha

The code in Listing 2 uses the backgroundColor attribute of the Application element to set the background color of the Flash window to purered using the hexadecimal notation #FF0000.

A few words about color

For those who may not be familiar with this concept, the overall background color is controlled by a mixture of different contributions of the red, green,and blue primary colors. For example, pure red plus pure blue produces a color commonly known as magenta . Pure green plus pure blue produces cyan . Pure red plus pure green produces yellow . Pure red plus pure green plus pure blue produces white . The absence of all three colors produces black.

Three eight-bit bytes

The values for red, green, and blue respectively are specified by the values of three eight-bit bytes. The value of each byte can range from 0 to 255decimal (00 to FF in hexadecimal) . A value of 0 (00 in hexadecimal) means that the primary color is not included in the mixture and a value of 255 (FF in hexadecimal) means that the primary color is included full strength in the mixture.

Using this scheme, it is possible to generate more than sixteen million different colors.

The order of the red, green, and blue contributions to the overall color in hexadecimal notation is RRGGBB, where the letter pairs stand for red, green, andblue respectively.

A color gradient

The Flex 3 application shown in Listing 2 sets the backgroundGradientColors attribute of the Application element to range from pure green (#00FF00) at the top of the Flash window to pure blue (#0000FF) at the bottom. As mentioned earlier, the application sets the backgroundColor to pure red using the hexadecimal notation #FF0000.

As you will see later, the Application element of a Flex 4 application doesn't have an attribute named backgroundGradientColors , so we will have to find another way to create a color gradient in the Flash window for a Flex 4 application.

Alpha

The appearance of the resulting mix of colors can be controlled by changing the value of the backgroundAlpha attribute of the Application element. This attribute can take on values ranging between 0.0 and 1.0. (In other programming systems, alpha is often allowed to vary between 0 and 255 decimal, or between 00 and FF hexadecimal.)

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
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
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
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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Source:  OpenStax, Introduction to xml. OpenStax CNX. Dec 02, 2014 Download for free at https://legacy.cnx.org/content/col11207/1.18
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