--- /dev/null
+
+USING: kernel namespaces threads sequences math math.vectors
+ opengl.gl opengl colors ui ui.gadgets ui.gadgets.slate
+ fry rewrite-closures vars springies accessors math.geometry.rect ;
+
+IN: springies.ui
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+: draw-node ( node -- ) pos>> { -5 -5 } v+ [ { 10 10 } gl-rect ] with-translation ;
+
+: draw-spring ( spring -- )
+ [ node-a>> pos>> ] [ node-b>> pos>> ] bi gl-line ;
+
+: draw-nodes ( -- ) nodes> [ draw-node ] each ;
+
+: draw-springs ( -- ) springs> [ draw-spring ] each ;
+
+: set-projection ( -- )
+ GL_PROJECTION glMatrixMode
+ glLoadIdentity
+ 0 world-width 1- 0 world-height 1- -1 1 glOrtho
+ GL_MODELVIEW glMatrixMode
+ glLoadIdentity ;
+
+! : display ( -- ) set-projection black gl-color draw-nodes draw-springs ;
+
+: display ( -- ) set-projection black gl-color draw-nodes draw-springs ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+VAR: slate
+
+VAR: loop
+
+: update-world-size ( -- ) slate> rect-dim >world-size ;
+
+: refresh-slate ( -- ) slate> relayout-1 ;
+
+DEFER: maybe-loop
+
+: run ( -- )
+ update-world-size
+ iterate-system
+ refresh-slate
+ yield
+ maybe-loop ;
+
+: maybe-loop ( -- ) loop> [ run ] when ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+: springies-window* ( -- )
+
+ C[ display ] <slate>
+ { 800 600 } >>pdim
+ C[ { 500 500 } >world-size loop on [ run ] in-thread ] >>graft
+ C[ loop off ] >>ungraft
+ [ >slate ] [ "Springies" open-window ] bi ;
+
+: springies-window ( -- ) [ [ springies-window* ] with-scope ] with-ui ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+: go* ( quot -- ) '[ [ springies-window* 1000 sleep @ ] with-scope ] with-ui ;