128 lines
1.5 KiB
ArmAsm
128 lines
1.5 KiB
ArmAsm
;========================
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; draw dialog box
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;========================
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; from X1H:X1L,Y1 to X2H:X2L, Y2
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; FIXME: X1H/X2H mostly ignored
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draw_box:
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; draw rectangle
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lda #$33 ; color is white1
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sta VGI_RCOLOR
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lda BOX_X1L
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sta VGI_RX1
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lda BOX_Y1
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sta VGI_RY1
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; calculate X run
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sec ; 16-bit subtract?
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lda BOX_X2H ; doesn't handle >255
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sbc BOX_X1H
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lda BOX_X2L
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sbc BOX_X1L
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sta VGI_RXRUN
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sec
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lda BOX_Y2
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sbc BOX_Y1
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sta VGI_RYRUN
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jsr vgi_simple_rectangle
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; draw lines
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lda #$22 ; color is purple
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sta VGI_RCOLOR
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; draw outer rectangle, x+6, y+5 x-6, y-5
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; draw 4 boxes
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; x1+6,y1+5 ... x2-6,y1+6
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; x1+6,y2-6 ... x2-6,y2-5
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; x1+6,y1+5 ... x1+7,y2-6
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; x2-7,y1+5 ... x2-6,y2-6
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;===============================
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; top: x1+6,y1+5 ... x2-6,y1+6
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clc
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lda VGI_RX1
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adc #6
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sta VGI_RX1
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sec
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lda VGI_RXRUN
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sbc #12
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sta VGI_RXRUN
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clc
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lda BOX_Y1
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adc #5
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sta VGI_RY1
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lda #2
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sta VGI_RYRUN
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jsr vgi_simple_rectangle
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;===============================
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; bottom: x1+6,y2-6 ... x2-6,y2-5
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sec
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lda BOX_Y2
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sbc #6
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sta VGI_RY1
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lda #2
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sta VGI_RYRUN
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jsr vgi_simple_rectangle
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;===============================
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; left: x1+6,y1+5 ... x1+7,y2-6
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clc
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lda BOX_Y1
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adc #5
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sta VGI_RY1
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lda #2
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sta VGI_RXRUN
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sec
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lda BOX_Y2
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sbc BOX_Y1
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sbc #10
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sta VGI_RYRUN
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jsr vgi_simple_rectangle
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;===============================
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; right: x2-7,y1+5 ... x2-6,y2-6
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sec
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lda BOX_X2L
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sbc #7
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sta VGI_RX1
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clc
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lda BOX_Y1
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adc #5
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sta VGI_RY1
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sec
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lda BOX_Y2
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sbc BOX_Y1
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sbc #9
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sta VGI_RYRUN
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jsr vgi_simple_rectangle
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rts
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