UnrealScript Game Programming Cookbook

Chapter 7

203

We offset the bar's position again by using the CorrectedHudPOS() function we

used in the last recipe as well. This time however, the bar will be in the top-right

corner of the screen.

At the bottom of the function, we have a call to our DrawAmmoBar()

function, which we'll get to know in the next step. It looks nearly identical

to our DrawHealthBar() function, except that we're using our AmmoCount

and MaxAmmo variables as parameters.

3. Let's create that DrawAmmoBar() function. It appears and operates just like
   our DrawHealthBar() function in the previous recipe.
   /**
   
   
   • Draw player's ammo. Adjusts the bar color based on
   
   
   • available ammo
     **/
     simulated function DrawAmmoBar(float X, float Y, float
     Width, float MaxWidth, float Height, Canvas DrawCanvas,
     optional byte Alpha=255)
     {
     local float AmmoX;
     local color DrawColor, BackColor;
     // Color of bar relies on the player's current ammo
     AmmoX = Width/MaxWidth;
     // Set default color to white
     DrawColor = Default.WhiteColor;
     // Decrease the amount of blue
     DrawColor.B = 16;
     // If our ammo is > 80%, decrease the amount of red
     if (AmmoX > 0.8)
     {
     DrawColor.R = 112;
     }
     // If our ammo is < 40%, decrease the amount of green
     else if (AmmoX < 0.4 )
     {
     DrawColor.G = 80;
     }
     DrawColor.A = Alpha;
     BackColor = default.WhiteColor;
     BackColor.A = Alpha;
     /* Ammo bar texture /
     DrawBarGraph(X,Y,Width,MaxWidth,Height,
     DrawCanvas,DrawColor,BackColor);
     }