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- [John Horton] Hey,
welcome to the HUD class.

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In the last video, we learnt
how to play various sounds.

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In this video, we're
going to take a look at

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coding the HUD.h file and HUD.cpp file.

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The HUD is supper simple and not really

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anything different compared to the other

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two projects we saw in beginning

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C++ game programming, part one.

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What we will do that is
different is wrap all

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the code up in a new HUD class.

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If we declare all the font,
text and other variables

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as members of this new class,

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we can then initialize
them in the constructor

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and provide getter functions
to all their values.

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This will keep the engin
class clear from loads

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of declarations and initializations.

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Let's get started with coding HUD.h.

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First, we will code the HUD.h file with

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all the member variables
and function declarations.

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Right click Header Files
in the Solution Explorer,

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and select Add New Item.

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In the opened window, click Header File,

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and then in the name field write HUD.

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Lastly, click the Add button.

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We are now ready to code the Header File

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for the HUD class.

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Add this highlighted code to the file.

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In this code, first we
have one font incidence

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and three text incidences.

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The text objects will be used to show

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a message prompting the user to start,

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the time remaining, and
the current level number.

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The public functions are more interesting.

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First, there is the constructor,

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where most of the code will go.

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The constructor will initialize the font

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and text objects, as well as position them

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on the screen relative to the
current screen resolution.

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The three getter functions:
get message, get level

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and get time, will return
a text object to the

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calling code in order
to be able to draw them

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to the screen.

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The set level and set time functions

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will be used to update the text shown

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in m_LevelText and m_Time
Text, respectively.

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Now, we can code all the definitions for

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the functions we have just outlined.

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Next we'll be coding the HUD.cpp file.

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As always, right click Source Files

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in the Solution Explorer,
and select Add New Item.

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In the opened window, click C++ File and

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then in the name field type HUD.

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Finally, click the Add button.

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We are now ready to code the .cpp file

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for the HUD class.

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Add all this highlighted code.

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We'll go through it step by step.

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After we have added the
necessary include directives,

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first we store the horizontal and vertical

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resolution in a vector
2u called Resolution.

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Next, we load the font
from the fonts directory

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that we added back in section one.

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This is the font file.

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Now, getting back to the code.

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This set of code performs
certain operations.

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The first line sets the font.

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Second one sets the size.

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Here it will set the
color, currently white.

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And last line sets the
text of m_StartText,

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with the help of set String function.

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The text is "Press enter when ready!".

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The next block of code captures the size

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of the rectangle that wraps m_StartText,

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and then performs a
calculation to work out

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how to position it centrally on the screen

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with the help of set position function.

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The final two blocks of
code in the constructor set,

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the font, the text size, the color,

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the position and the actual text for

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m_TimeText and m_LevelText using

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set string function.

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We will see in a moment
however, that these

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two text objects will
be updateable through

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two setter functions
whenever it is required.

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Now, add this highlighted code immediately

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after the previous code we just added.

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In this highlighted code we're adding

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getter and setter functions.

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Let's go through it.

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The first three functions
that I just highlighted

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simply return the appropriate text object

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m_StartText, m_LevelText

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and m_TimeText.

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We will use these functions shortly when

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drawing the HUD on the screen.

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The final two functions
setLevel and setTime,

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use the set string functions to update

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the appropriate text object with

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the value that will be passed in

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from the update function
of the engine class

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every 500 frames.

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That's all about HUD class.

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In this video, we've looked at coding

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the HUD.h and HUD.cpp file.

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Great, with all that done, we can put the

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HUD class to work in our game engine.

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So next, we'll learn using the HUD class.