113 lines
2.1 KiB
Tal
113 lines
2.1 KiB
Tal
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|00 @System &vector $2 &pad $6 &r $2 &g $2 &b $2
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|20 @Screen &vector $2 &width $2 &height $2 &auto $1 &pad $1 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1
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|c0 @DateTime &year $2 &month $1 &day $1 &hour $1 &minute $1 &second $1 &dotw $1 &doty $2 &isdst $1
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|0100
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#23ef .System/r DEO2
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#3b7f .System/g DEO2
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#665f .System/b DEO2
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,draw-tree JSR
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;prng-init JSR2
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( prepare particles )
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.Screen/width DEI2 #0000
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&l
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( addr ) DUP2 #20 SFT2 ;snow ADD2 STH2
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( x ) DUP2 STH2kr STA2
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( y ) INC2r INC2r ;prng JSR2 #0100 ( mod2 ) DIV2k MUL2 SUB2 STH2r STA2
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INC2 GTH2k ,&l JCN
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POP2 POP2
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( animate )
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;on-frame .Screen/vector DEO2
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BRK
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@draw-tree ( -- )
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#0060 .Screen/y DEO2
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( star )
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#0103
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DUP2 ,draw-line JSR
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#0203 ,draw-line JSR
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,draw-line JSR
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( tree )
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#8000
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&tree
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DUP #02 SFT #3f AND DUP ADD STH
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DUP #0f AND STHr ADD #01 ,draw-line JSR
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INC GTHk ,&tree JCN
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POP2
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( bark )
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#1000
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&bark
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#0802 ,draw-line JSR
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INC GTHk ,&bark JCN
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POP2
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( ground )
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#ff03
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@draw-line ( width color -- )
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,&c STR
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#00 SWP
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DUP2 .Screen/width DEI2 #01 SFT2 SWP2 SUB2 ,&o STR2
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DUP2 ADD2 INC2 #0000
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&l
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DUP2 [ LIT2 &o $2 ] ADD2 .Screen/x DEO2
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[ LIT &c $1 ] .Screen/pixel DEO
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INC2 GTH2k ,&l JCN
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POP2 POP2
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.Screen/y DEI2k INC2 ROT DEO2
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JMP2r
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@on-frame ( -> )
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.Screen/width DEI2 #0000
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&l
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;prng JSR2 NIP #07 AND ,&skip JCN
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DUP2 #20 SFT2 ;snow ADD2
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( clear ) DUP2 #40 ,draw-snowflake JSR
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( y ) INC2k INC2 LDA2k INC2 #00f0 DIV2k MUL2 SUB2 SWP2 STA2
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( draw ) #43 ,draw-snowflake JSR
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&skip
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INC2 GTH2k ,&l JCN
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POP2 POP2
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BRK
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@draw-snowflake ( addr* color -- )
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ROT ROT LDA2k .Screen/x DEO2
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INC2 INC2 LDA2 .Screen/y DEO2
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.Screen/pixel DEO
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JMP2r
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@prng-init ( -- )
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( seed )
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#00 .DateTime/second DEI
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#00 .DateTime/minute DEI #60 SFT2 EOR2
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#00 .DateTime/hour DEI #c0 SFT2 EOR2 ,prng/x STR2
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#00 .DateTime/hour DEI #04 SFT2
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#00 .DateTime/day DEI #10 SFT2 EOR2
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#00 .DateTime/month DEI #60 SFT2 EOR2
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.DateTime/year DEI2 #a0 SFT2 EOR2 ,prng/y STR2
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JMP2r
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@prng ( -- number* )
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LIT2 &x $2
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DUP2 #50 SFT2 EOR2
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DUP2 #03 SFT2 EOR2
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LIT2 &y $2 DUP2 ,&x STR2
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DUP2 #01 SFT2 EOR2 EOR2
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,&y STR2k POP
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JMP2r
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@snow
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