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The first two parameters

The first two parameters that identify the sprite sheet and the position at which to draw the image are the same as the version that I explained in anearlier module.

Three interesting parameters

Three of the parameters shown in the above list and in Listing 12 are parameters that are new to this module and in which I have an interest.

The remaining four parameters

Four of the parameters shown in the above list and in Listing 12 are new to this module, but I don't have any interest in them. The program simply passes "harmless" values to them.

The rectangle

The first thing that is new to this module in Listing 12 is the passing of a new object of type Rectangle as the third parameter.

With this version of the Draw method, only the contents of the sprite sheet that fall within that rectangle are drawn. The size andposition of the rectangle are specified with:

  • The coordinates of the upper left corner of the rectangle
  • The width and the height of the rectangle

The upper left corner of the rectangle

The upper left corner of the rectangle is specified in Listing 12 by the contents of the variables named xStart and yStart . The values in these two variables were assigned in Listing 5 . They specify the coordinates of the upper left corner of a small rectangle that contains one ofthe sprite images shown in Figure 1 .

The width and the height of the rectangle

The width and the height are specified by the contents of the variables named frameWidth and frameHeight . The values in these two variables were assigned in Listing 3 as the width and height of the small rectangle that contains one of the sprite images in Figure 1 .

The horizontal and vertical scale factors

The seventh parameter requires a Vector2D object containing the scale factors to be applied to the horizontal and vertical sizes of thesprite before it is drawn. (You learned about the Vector2D class in an earlier module.)

A new object

Listing 12 instantiates a new object of the Vector2D class that encapsulates the value stored in the variable named scale for the horizontal and vertical scale factors.

A value of 4 was assigned to the variable named scale when it was initialized in Listing 1 .

Four times larger

Therefore, the sprite images that are drawn in the game window are actually four times larger than the sprite images in the sprite sheet shown in Figure 1 . ( Note that the images were also scaled in Figure 1 for display purposes in order to make them more visible. You need to take that into account if you downloadthe sprite sheet and use it to replicate this program.)

Causing the sprite to face in the correct direction

The eighth parameter to the Draw method in Listing 12 requires an object of type SpriteEffects . The contents of the variable named spriteEffect are passed as this parameter. The contents of this variable were set to one of the following two values by thecode in Listing 9 :

  • noEffect - SpriteEffects.None
  • flipEffect - SpriteEffects.FlipHorizontally

The purpose of this parameter is to cause the sprite to face in the correct direction.

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
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Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
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faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
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Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
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Innocent
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Lubega
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_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
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Sadik
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Tesfaye
by fussion
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what are the advantages of normal Flora to the host
Micheal
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Micheal
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Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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Source:  OpenStax, Xna game studio. OpenStax CNX. Feb 28, 2014 Download for free at https://legacy.cnx.org/content/col11634/1.6
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