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About all CONIO functions offering a <...>xy variant call popa _gotoxy By providing an internal gotoxy variant that starts with a popa all those CONIO function can be shortened by 3 bytes. As soon as program calls more than one CONIO function this means an overall code size reduction.
48 lines
1.2 KiB
ArmAsm
48 lines
1.2 KiB
ArmAsm
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; Maciej 'YTM/Elysium' Witkowiak
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; 06.03.2002
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; void cvlinexy (unsigned char x, unsigned char y, unsigned char length);
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; void cvline (unsigned char length);
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.export _cvlinexy, _cvline
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.import gotoxy, fixcursor
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.importzp cursor_x, cursor_y, cursor_r
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.include "jumptab.inc"
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.include "geossym.inc"
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_cvlinexy:
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pha ; Save the length
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jsr gotoxy ; Call this one, will pop params
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pla ; Restore the length
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_cvline:
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cmp #0 ; Is the length zero?
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beq L9 ; Jump if done
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tax
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lda cursor_x ; x position
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clc
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adc #3 ; in the middle of cell
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sta r4L
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lda cursor_x+1
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adc #0
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sta r4L+1
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lda cursor_y ; top start
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sta r3L
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txa ; bottom end
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clc
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adc cursor_r
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sta cursor_r
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asl a
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asl a
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asl a
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clc ; one pixel less
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sbc #0
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sta r3H
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lda #%11111111 ; pattern
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jsr VerticalLine
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jsr fixcursor
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L9: rts
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