mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-06-08 16:29:35 +00:00
58 lines
2.2 KiB
NASM
58 lines
2.2 KiB
NASM
*
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*``````````````````````````````*
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* TRECTF (NATHAN RIGGS) *
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* *
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* INPUT: *
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* *
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* ZPW1 = X ORIGIN *
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* ZPW1+1 = X DESTINATION *
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* ZPW2 = Y ORIGIN *
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* ZPW2+1 = Y DESTINATION *
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* ZPB1 = FILL CHARACTER *
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* *
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* OUTPUT *
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* *
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* FILLED RECTANGLE TO SCREEN *
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* *
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* DESTROY: NZCIDV *
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* ^^^ ^ *
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* *
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* CYCLES: 127+ *
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* SIZE: 54 BYTES *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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]X1 EQU ZPW1 ; TOP LEFT OF RECTANGLE
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]X2 EQU ZPW1+1 ; BOTTOM RIGHT OF RECTANGLE
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]Y1 EQU ZPW2 ; TOP Y POSITION OF RECTANGLE
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]Y2 EQU ZPW2+1 ; BOTTOM POSITION OF RECTANGLE
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]F EQU ZPB1 ; FILL CHARACTER
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*
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]XC EQU ZPB2 ; CHANGE IN X
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]YC EQU ZPB3 ; CHANGE IN Y
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*
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TRECTF
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LDA ]X1 ; {4C3B} LOAD TOP LEFT X ORIGIN
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STA ]XC ; {4C3B} STORE AS INITIAL INDEX
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LDA ]Y1 ; {3C2B} LOAD TOP LEFT Y ORIGIN
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STA ]YC ; {4C3B} STORE AS INITIAL INDEX
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:LP1 ; PRINT HORIZONTAL LINE
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LDA ]YC ; {4C3B} LOAD FIRST Y INDEX
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LDY ]XC ; {4C3B} LOAD FIRST X INDEX IN Y
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JSR GBCALC ; {43C3B} GET SCREEN MEMORY ADDR
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LDA ]F ; {3C2B} LOAD FILL CHARACTER
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STA (GBPSH),Y ; {6C2B} PUT CHAR IN SCREEN MEMORY
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LDA ]YC ; {4C3B} LOAD Y INDEX
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INY ; {2C1B} INCREASE XPOS INDEX
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STY ]XC ; {4C3B} STORE NEW X INDEX
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CPY ]X2 ; {4C3B} IF XPOS < XMAX,
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BNE :LP1 ; {3C2B} KEEP PRINTING LINE
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*
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LDA ]X1 ; {4C3B} OTHERWISE, RESET XPOS
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STA ]XC ; {4C3B} AND STORE IN INDEX
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INC ]YC ; {6C3B} AND INCREASE YPOS
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LDA ]YC ; {4C3B} RELOAD Y INDEX
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CMP ]Y2 ; {4C3B} IF YPOS < YMAX
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BNE :LP1 ; {3C2B} PRINT HORIZONTAL LINE
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:EXIT
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RTS ; {6C1B}
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