62 lines
1.7 KiB
Factor
62 lines
1.7 KiB
Factor
USING: accessors arrays calendar circular colors
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colors.constants fry kernel locals math math.order math.vectors
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namespaces opengl processing.shapes sequences threads ui
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ui.gadgets ui.gestures ui.render ;
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IN: trails
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! Example 33-15 from the Processing book
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: mouse ( -- point )
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! Return the mouse location relative to the current gadget
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hand-loc get hand-gadget get screen-loc v- ;
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: point-list ( n -- seq ) { 0 0 } <array> <circular> ;
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: percent->radius ( percent -- radius ) neg 1 + 25 * 5 max ;
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: dot ( pos percent -- ) percent->radius draw-circle ;
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TUPLE: trails-gadget < gadget paused points ;
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:: iterate-system ( GADGET -- )
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! Add a valid point if the mouse is in the gadget
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! Otherwise, add an "invisible" point
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hand-gadget get GADGET = [ mouse ] [ { -10 -10 } ] if
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GADGET points>> circular-push ;
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:: start-trails-thread ( GADGET -- )
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GADGET f >>paused drop
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[
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[
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GADGET paused>>
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[ f ]
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[ GADGET iterate-system GADGET relayout-1 1 milliseconds sleep t ]
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if
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]
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loop
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] "trails" spawn drop ;
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M: trails-gadget ungraft* t >>paused drop ;
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M: trails-gadget pref-dim* drop { 500 500 } ;
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: each-percent ( seq quot -- )
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[ dup length ] dip '[ 1 + _ / @ ] each-index ; inline
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M:: trails-gadget draw-gadget* ( GADGET -- )
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T{ rgba f 1 1 1 0.4 } fill-color set ! White, with some transparency
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T{ rgba f 0 0 0 0 } stroke-color set ! no stroke
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COLOR: black gl-clear
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GADGET points>> [ dot ] each-percent ;
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: <trails-gadget> ( -- trails-gadget )
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trails-gadget new
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300 point-list >>points
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t >>clipped?
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dup start-trails-thread ;
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MAIN-WINDOW: trails-window
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{ { title "Trails" } }
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<trails-gadget> >>gadgets ;
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