mirror of
https://github.com/A2osX/A2osX.git
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155 lines
2.7 KiB
Plaintext
155 lines
2.7 KiB
Plaintext
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PR#3
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PREFIX /A2OSX.BUILD
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NEW
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INC 1
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AUTO 6
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.LIST OFF
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*--------------------------------------
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ClipLine.LEFT .EQ 1
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ClipLine.RIGHT .EQ 2
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ClipLine.BOTTOM .EQ 4
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ClipLine.TOP .EQ 8
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*--------------------------------------
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* In:
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* Control Block in CB.Cache
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* Graphic Context in GC.Cache
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*--------------------------------------
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ClipLine jsr ClipLine.EncodeP1
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jsr ClipLine.EncodeP2
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.1 lda ClipLine.P1
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ora ClipLine.P2
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beq .88
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lda ClipLine.P1
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and ClipLine.P2
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bne .99
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lda ClipLine.P1
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beq .5
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bit #ClipLine.TOP
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beq .2
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* Y1 is above S.CB.Y1....
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* DY=Y2-Y1;
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jsr ClipLine.EncodeP1
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bra .1
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.2 bit #ClipLine.BOTTOM
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beq .3
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* Y1 is below S.CB.Y2....
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jsr ClipLine.EncodeP1
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bra .1
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.3 bit #ClipLine.RIGHT
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beq .4
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* X1 is after S.CB.X2....
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jsr ClipLine.EncodeP1
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bra .1
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* X1 is before S.CB.X1....
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.4
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jsr ClipLine.EncodeP1
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bra .1
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* P2
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.5 lda ClipLine.P2
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bit #ClipLine.TOP
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beq .6
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* Y2 is above S.CB.Y1....
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jsr ClipLine.EncodeP2
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bra .1
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.6 bit #ClipLine.BOTTOM
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beq .7
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* Y2 is below S.CB.Y2....
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jsr ClipLine.EncodeP2
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bra .1
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.7 bit #ClipLine.RIGHT
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beq .8
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* X2 is after S.CB.X2....
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jsr ClipLine.EncodeP2
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bra .1
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* X2 is before S.CB.X1....
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.8
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jsr ClipLine.EncodeP2
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bra .1
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.88 clc
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rts
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.99 sec
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rts
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*--------------------------------------
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ClipLine.EncodeP1
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ldy #0
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lda CB.Cache+S.CB.X1
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ldx CB.Cache+S.CB.X1+1
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jsr ClipLine.EncodeX.AX
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tay
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lda CB.Cache+S.CB.Y1
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ldx CB.Cache+S.CB.Y1+1
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jsr ClipLine.EncodeY.AX
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sta ClipLine.P1
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rts
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*--------------------------------------
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ClipLine.EncodeP2
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ldy #0
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lda CB.Cache+S.CB.X2
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ldx CB.Cache+S.CB.X2+1
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jsr ClipLine.EncodeX.AX
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tay
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lda CB.Cache+S.CB.Y2
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ldx CB.Cache+S.CB.Y2+1
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jsr ClipLine.EncodeY.AX
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sta ClipLine.P2
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rts
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*--------------------------------------
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ClipLine.EncodeX.AX
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pha
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>SCMPAX GC.Cache+S.GC.X1
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bmi .1
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tya
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ora #ClipLine.LEFT
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plx
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rts
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.1 pla
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>SCMPAX GC.Cache+S.GC.X1
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bpl .8
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tya
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ora #ClipLine.RIGHT
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.8 rts
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*--------------------------------------
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ClipLine.EncodeY.AX
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pha
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>SCMPAX GC.Cache+S.GC.Y1
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bmi .1
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tya
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ora #ClipLine.TOP
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plx
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rts
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.1 pla
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>SCMPAX GC.Cache+S.GC.Y1
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bpl .8
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tya
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ora #ClipLine.BOTTOM
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.8 rts
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*--------------------------------------
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MAN
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SAVE /A2OSX.SRC/LIB/LIBGUI.S.CLIP
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LOAD /A2OSX.SRC/LIB/LIBGUI.S
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ASM
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