41 lines
1.2 KiB
Factor
41 lines
1.2 KiB
Factor
USING: accessors alarms arrays calendar colors.constants kernel
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locals math math.constants math.functions math.rectangles
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math.vectors opengl sequences system ui ui.gadgets ui.render ;
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IN: pendulum
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CONSTANT: g 9.81
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CONSTANT: l 20
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CONSTANT: theta0 0.5
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: current-time ( -- time ) nano-count -9 10^ * ;
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: T0 ( -- T0 ) 2 pi l g / sqrt * * ;
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: omega0 ( -- omega0 ) 2 pi * T0 / ;
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: theta ( -- theta ) current-time omega0 * cos theta0 * ;
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: relative-xy ( theta l -- xy )
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swap [ sin * ] [ cos * ] 2bi 2array ;
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: theta-to-xy ( origin theta l -- xy ) relative-xy v+ ;
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TUPLE: pendulum-gadget < gadget alarm ;
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: O ( gadget -- origin ) rect-bounds [ drop ] [ first 2 / ] bi* 0 2array ;
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: window-l ( gadget -- l ) rect-bounds [ drop ] [ second ] bi* ;
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: gadget-xy ( gadget -- xy ) [ O ] [ drop theta ] [ window-l ] tri theta-to-xy ;
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M: pendulum-gadget draw-gadget*
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COLOR: black gl-color
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[ O ] [ gadget-xy ] bi gl-line ;
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M:: pendulum-gadget graft* ( gadget -- )
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[ gadget relayout-1 ]
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20 milliseconds every gadget (>>alarm) ;
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M: pendulum-gadget ungraft* alarm>> cancel-alarm ;
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: <pendulum-gadget> ( -- gadget )
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pendulum-gadget new
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{ 500 500 } >>pref-dim ;
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: pendulum-main ( -- )
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[ <pendulum-gadget> "pendulum" open-window ] with-ui ;
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MAIN: pendulum-main
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