Icon bar: DrawInventoryIcon

       Name: DrawInventoryIcon                                       [Show more]
       Type: Subroutine
   Category: Icon bar
    Summary: Draw the inventory icon on top of the second button in the icon
             bar
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * BuyAndSellCargo calls DrawInventoryIcon
             * SetIconBarRow calls DrawInventoryIcon


.DrawInventoryIcon

                        ; We draw the inventory icon image from sprites with
                        ; sequential patterns, so first we configure the
                        ; variables to pass to the DrawSpriteImage routine

 LDA #2                 ; Set K = 2, to pass as the number of columns in the
 STA K                  ; image to DrawSpriteImage below

 STA K+1                ; Set K+1 = 2, to pass as the number of rows in the
                        ; image to DrawSpriteImage below

 LDA #69                ; Set K+2 = 69, so we draw the inventory icon image
 STA K+2                ; using pattern 69 onwards

 LDA #8                 ; Set K+3 = 8, so we build the image from sprite 8
 STA K+3                ; onwards

 LDA #3                 ; Set XC = 3 so we draw the image with the top-left
 STA XC                 ; corner in tile column 3

 LDA #25                ; Set YC = 25 so we draw the image with the top-left
 STA YC                 ; corner on tile row 25

 LDX #7                 ; Set X = 7 so we draw the image seven pixels into the
                        ; (XC, YC) character block along the x-axis

 LDY #7                 ; Set Y = 7 so we draw the image seven pixels into the
                        ; (XC, YC) character block along the y-axis

 JMP DrawSpriteImage_b6 ; Draw the inventory icon from sprites, using pattern
                        ; #69 onwards, returning from the subroutine using a
                        ; tail call