Graphics for Drag Racing '99

•  Variables Involved:
          Speed
          Position
          Throttle
          Clutch (On or Off)
          Gear (1-4)
          RPM
          Elapsed_Time
          TimeHolder
          Road
          Light_Stages
          Pre_Stage
          Stage
          Yellow1
          Yellow2
          Yellow3
          Green
          Break

  Functions Needed:
       Run_Lights
       Purpose:  To draw the starting lights at the beginning of the race on the screen.
       Inputs:  Pre_Stage, Stage, Yellow1, Yellow2, Yellow3, Green, Break
       Outputs:  Writes to a scratch segment.
       Description:  When a race starts this function will draw the starting lights and run through all the
        different light stages until the race begins.

      UpdateTime
       Purpose:  To draw the updated time on the screen.
       Inputs: Elapsed_Time
       Outputs: Writes directly to the screen.
       Description:  Every time the entire screen is updated the elapsed time that has gone by since the start of
        the race will be redrawn on the screen.  This was done using int 10h, 13h.  This draws strings to the
        screen in Graphics Mode
   
      UpdateG
       Purpose:  To show which gear is in use on the screen.
       Inputs:  Gear
       Outputs:  Writes to a scratch segment
       Description:  Throughout the race the screen will show which gear the car is in.  This function will redraw
        the appropriate part of the screen when a gear is switched.

       UpdateN
       Purpose:  To show which gear number is in use on the screen.
       Inputs:  Gear
       Outputs:  Writes to a scratch segment
       Description:  Throughout the race the screen will show which gear the car is in.  This function will redraw
        the appropriate part of the screen when a gear is switched.

       UpdateS
       Purpose:  To redraw the speedometer on the screen.
       Inputs: Speed
       Outputs:  Writes to a  scratch segment
       Description:  Whenever the screen is redrawn the appropriate speed, which is determined by the Speed
         variable, will be drawn on the speedometer on the screen.

       UpdateTach
       Purpose:  To redraw the tachometer on the screen.
       Inputs: RPM
       Outputs:  Writes to a scratch segment
       Description:  Whenever the screen is redrawn the appropriate RMP level, which is determined by the
         RPM variable, will be drawn on the tachometer on the screen.

       UpdateT
       Purpose:  To draw on the screen the throttle level.
       Inputs:  Throttle
       Outputs:  Writes directly to the screen.
       Description:  This function will draw a throttle level on the screen and will update this level by checking
        the throttle var and drawing the appropriate level on the screen.

       UpdateC
       Purpose:  To draw on the screen a clutch light and show wheather it is on or off
       Inputs:  Gear
       Outputs:  Writes to a scratch segment
       Description:  Whenever the clutch is pressed the screen will be drawn with the clutch light being on.  At
        all other times it will be off.

       DrawScreen
       Purpose:  To draw the basicview.
       Inputs:  None
       Outputs:  Writes to a scratch segment.
       Description:  This will draw the basic view on the screen.  All the update function will properly fix the
        incorrect pictures on the basic view.  After all the functions are called the scratch segment will be
        transferred to the video memory.