+ svg.appendChild json_to_svg filter:
+ id: 'crayon', filterUnits: 'userSpaceOnUse'
+ x: '-5%', y: '-5%', height: '110%', width: '110%'
+ children: [
+ { feTurbulence: baseFrequency: '.3', numOctaves: '2', type: 'fractalNoise' }
+ { feDisplacementMap: scale: '6', xChannelSelector: 'R', in: 'SourceGraphic' }
+ ]
+
+ # create canvas border
+ svg.appendChild json_to_svg rect:
+ x: 1
+ y: supply_height + 1
+ width: width - 2
+ height: height - 2 - supply_height
+ class: 'canvas_border'
+
+ supply = {}
+ for args, i in [
+ { width: 40, height: 40 }
+ { width: 12, height: 50 }
+ { width: 70, height: 12 }
+ ]
+ widget = new RectWidget {
+ width: args.width
+ height: args.height
+ x: 30 + i * 90 + (70 - args.width) / 2
+ y: (supply_height - args.height) / 2
+ svg: svg
+ }
+ supply[widget.id] = widget
+
+ # editor state
+ on_canvas = {}
+ selected = {}
+ editing = {} # has controls
+ dragging = false
+ drag_from = x: 0, y: 0 # mouse was here at last frame of drag
+ shift_key_down = false
+
+ deselect_all = (args) ->
+ except = args?.except ? null
+ for id, w of selected
+ w.set_style STYLE_NORMAL
+ delete selected[id]
+ closest_widget = (widgets, xy) ->
+ prox = PROX_MAX + 1
+ closest = null
+ for id, w of widgets
+ new_prox = w.proximity xy
+ if new_prox < prox
+ prox = new_prox
+ closest = w
+ if prox < PROX_MAX
+ return closest
+ return null
+ svg_event_to_xy = (e) ->
+ unless svg_offset?
+ svg_offset = $svg.offset()
+ return {
+ x: Math.round(e.pageX - svg_offset.left)
+ y: Math.round(e.pageY - svg_offset.top)
+ }
+ mousedown = (e) ->
+ mousemove e
+ if dragging # two mousedowns in a row?! it happens
+ return mouseup e
+ xy = svg_event_to_xy e
+ if xy.y < supply_height
+ closest = closest_widget supply, xy
+ if closest?
+ closest = closest.clone()
+ on_canvas[closest.id] = closest
+ else
+ closest = closest_widget on_canvas, xy
+ if closest?
+ unless (shift_key_down or selected[closest.id]?)
+ deselect_all except: closest
+ selected[closest.id] = closest
+ closest.set_style STYLE_DRAGGING
+ dragging = true
+ drag_from = xy
+ else
+ deselect_all()
+ return false
+ mouseup = (e) ->
+ mousemove e
+ if dragging
+ for id, w of selected
+ if w.y < supply_height
+ w.destruct()
+ delete selected[id]
+ else
+ w.set_style STYLE_SELECTED
+ dragging = false
+ return false
+ prev_hover = null
+ mousemove = (e) ->
+ xy = svg_event_to_xy e
+ if dragging
+ return if drag_from.x is xy.x and drag_from.y is xy.y
+ rel_x = xy.x - drag_from.x
+ rel_y = xy.y - drag_from.y
+ drag_from = xy
+ for id, w of selected
+ w.move x: w.x + rel_x, y: w.y + rel_y
+ else
+ hover = closest_widget on_canvas, xy
+ unless hover?
+ hover = closest_widget supply, xy
+ if hover != prev_hover
+ if prev_hover?
+ # FIXME
+ if selected[prev_hover.id]?
+ prev_hover.set_style STYLE_SELECTED
+ else
+ prev_hover.set_style STYLE_NORMAL
+ if hover?
+ hover.set_style STYLE_HOVER
+ prev_hover = hover