Author: wmb Date: 2007-08-15 05:28:22 +0200 (Wed, 15 Aug 2007) New Revision: 545
Added: cpu/x86/pc/olpc/waveform.fth Log: waveform.fth - initial checkin of line drawing code, not included in build.
Added: cpu/x86/pc/olpc/waveform.fth =================================================================== --- cpu/x86/pc/olpc/waveform.fth (rev 0) +++ cpu/x86/pc/olpc/waveform.fth 2007-08-15 03:28:22 UTC (rev 545) @@ -0,0 +1,175 @@ +dev screen + +9 constant wave-scale +1 d# 15 wave-scale - << 2+ constant wave-height + +: pitch* ( #lines -- #pixels ) bytes/line * ; +: wave-top ( -- adr ) + screen-height wave-height 2* - pitch* frame-buffer-adr + +; + +: wave0 ( -- ) screen-height wave-height - ; + +5 value fg +h# f value bg + +: pointat ( x y -- ) + bytes/line * swap wa+ frame-buffer-adr + fg swap w! +; + +variable curx variable cury +: moveto ( x y -- ) cury ! curx ! ; +: rmove ( dx dy -- ) cury +! curx +! ; +: point ( -- ) curx @ cury @ pointat ; + +2variable bump 2variable nobump +: bresenham ( incr reload -- ) + tuck dup 2/ ( reload incr reload delta ) + swap 0 do ( reload incr delta ) + point ( reload incr delta ) + over - dup 0< if ( reload incr delta' ) + 2 pick + ( reload incr delta' ) + bump ( reload incr delta var ) + else ( reload incr delta ) + nobump ( reload incr delta var ) + then ( reload incr delta ) + 2@ cury +! curx +! ( reload incr delta ) + loop ( reload incr delta ) + 3drop point ( ) +; + +: rline ( dx dy -- ) + dup 0< if ( dx dy- ) + negate ( dx |dy| ) + over 0< if ( dx- |dy| ) + swap negate swap ( |dx| |dy| ) + 2dup < if 0 -1 else swap -1 0 then -1 + else ( dx+ |dy| ) + 2dup < if 0 -1 else swap 1 0 then 1 + then ( incr reload nobump-xy bump-x ) + -1 ( incr reload nobump-xy bump-xy ) + else ( dx dy+ ) + over 0< if ( dx- dy+ ) + swap negate swap ( |dx| dy ) + 2dup < if 0 1 else swap -1 0 then -1 + else ( dx+ dy+ ) + 2dup < if 0 1 else swap 1 0 then 1 + then ( incr reload nobump-xy bump-x ) + 1 ( incr reload nobump-xy bump-xy ) + then ( incr reload nobump-xy bump-xy ) + bump 2! nobump 2! ( incr reload ) + bresenham ( ) +; + +0 [if] +\ Divide-and-conquer line drawing. Bresenham above is about twice +\ as fast, but this is less code. +: xy+ ( x1 y1 x2 y2 -- x3 y3 ) rot + >r + r> ; +: (rxline) ( x y dx dy -- ) + 2dup or if ( x y dx dy ) + swap 2/ swap 2/ ( x y dx/2 dy/2 ) + 2over 2over recurse ( x y dx/2 dy/2 ) + 2swap 2over xy+ 2dup pointat 2swap recurse ( ) + else ( x y dx dy ) + 4drop ( ) + then ( ) +; +: rxline ( dx dy -- ) curx @ cury @ 2swap (rxline) ; +[then] + +: lineto ( x y -- ) swap curx @ - swap cury @ - rline ; + + +1 [if] +\ Test for line drawing +d# 240 value gey0 d# 240 value gex0 +: godseye ( -- ) + gex0 0 do + i gey0 moveto + gex0 gey0 i - lineto + gex0 2* i - gey0 lineto + gex0 gey0 i + lineto + i gey0 lineto + 3 +loop +; +: godseye1 ( -- ) + gex0 0 do + i gey0 moveto + gex0 i - i ( x0-i i ) + negate 2dup rline ( x0-i -i ) + negate 2dup rline ( x0-i i ) + swap negate swap ( i-x0 i ) + 2dup rline ( x0-i -i ) + negate rline ( ) + 3 +loop +; +[then] + +: plot0 ( -- x y ) 0 screen-height 10 - ; +: clear-plot ( width height -- ) + 2>r + bg plot0 2r> ( bg plot0-xy wh ) + rot over - -rot ( bg plot0-xy' wh ) + fill-rectangle +; + +variable ylim variable ymin +1 value stretch +: clip-y ( value -- value' ) ymin @ - 0 max ylim @ min ; +: plot ( xt xmin xmax xscale ymin ymax -- ) + over - ylim ! ymin ! to stretch ( xt xmin xmax ) + over 3 pick execute clip-y ( xt xmin xmax y-at-xmin ) + plot0 2 pick - moveto ( xt xmin xmax y-at-xmin ) + -rot swap 1+ ?do ( xt last ) + i 2 pick execute clip-y ( xt last value ) + tuck - ( xt value delta ) + stretch swap rline ( xt value ) + loop ( xt last ) + 2drop ( ) +; + +: clear-waveform ( -- ) + bg + 0 wave0 wave-height - screen-width wave-height 2* + fill-rectangle +; +: waveform-start ( -- ) 0 wave0 moveto ; +: draw-wave ( adr ) + 0 swap ( last adr ) + screen-width 0 do ( last adr ) + tuck <w@ ( adr last this-unscaled ) + wave-scale >>a ( adr last this ) + tuck swap - ( adr this distance ) + 1 swap rline ( adr this ) + swap wa1+ ( this adr ) + loop ( last adr ) + 2drop +; +: waveform ( adr -- ) clear-waveform waveform-start draw-wave ; +: set-fg ( fg -- ) to fg ; +: set-bg ( bg -- ) to bg ; +: vgrid ( width height interval -- ) + rot 0 ?do ( height interval ) + i plot0 nip moveto ( height interval ) + 0 2 pick negate rline ( height interval ) + dup +loop ( height interval ) + 2drop ( ) +; +: hgrid ( width height interval -- ) + swap 0 ?do ( width interval ) + plot0 i - moveto ( width interval ) + over 0 rline ( width interval ) + dup +loop ( width interval ) + 2drop ( ) +; + +dend + +: $call-screen ( ? name$ -- ? ) stdout @ $call-method ; +: wave ( adr -- ) " waveform" $call-screen ; +: clear-plot ( width height -- ) " clear-plot" $call-screen ; +: lineplot ( xt xmin xmax xscale ymin ymax -- ) " plot" $call-screen ; +: set-fg ( fg -- ) " set-fg" $call-screen ; +: set-bg ( bg -- ) " set-bg" $call-screen ; +: vgrid ( width height interval -- ) " vgrid" $call-screen ; +: hgrid ( width height interval -- ) " hgrid" $call-screen ;
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