From 6c36ab228f79fe01714b1cdf7cf08316fc65f3d7 Mon Sep 17 00:00:00 2001
From: Jason Woofenden <jason@jasonwoof.com>
Date: Sat, 7 Nov 2015 11:12:15 -0500
Subject: [PATCH] experimental pickling to url hash

---
 main.coffee |   53 ++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 50 insertions(+), 3 deletions(-)

diff --git a/main.coffee b/main.coffee
index 8f20313..d8f75b5 100644
--- a/main.coffee
+++ b/main.coffee
@@ -31,7 +31,10 @@ STATES = {
 }
 TYPE_WIDGET = 1
 TYPE_CONTROL = 2
-
+CSS_CLASS_TO_PICKLE_TYPE = {
+	box: '0'
+	polyline: '1'
+}
 # json (compiled to javascript and minified) is ~8% smaller than the resulting xml
 json_to_svg = (json) ->
 	for tag, attrs of json
@@ -206,6 +209,10 @@ class RectWidget extends Widget
 			@svg.removeChild @el
 	clone: ->
 		return new RectWidget @
+	as_array: ->
+		return [@x, @y, @width, @height]
+	from_array: (a) ->
+		return new RectWidget x: a[0], y: a[1], width: a[2], height: a[3]
 	set_state: (state) ->
 		super state
 		@update_class()
@@ -302,6 +309,21 @@ class PolylineWidget extends Widget
 		super()
 		if @el?
 			@svg.removeChild @el
+	as_array: ->
+		ret = []
+		for n in @nodes
+			ret.push @x + n.x
+			ret.push @y + n.y
+		return ret
+	from_array: (a) ->
+		args = {
+			x: a[0]
+			y: a[1]
+			nodes: []
+		}
+		while a.length
+			args.nodes.push x: a.shift() - args.x, y: a.shift() - args.x
+		return new PolylineWidget args
 	clone: ->
 		return new PolylineWidget @
 	my_path_d: ->
@@ -394,10 +416,9 @@ class PolylineWidget extends Widget
 			ret.push x: @x + n.x, y: @y + n.y
 		return ret
 	make_controls: (args) -> # create controls, return them
-		console.log 'make line controls'
 		if @controls.length > 0
 			if console?.log?
-				console.log "warning: re-adding controls"
+				console.log "warning: re-adding line controls"
 			@kill_controls()
 		positions = @control_positions()
 		for i in [0...positions.length]
@@ -464,6 +485,31 @@ init = ->
 	drag_from = x: 0, y: 0 # mouse was here at last frame of drag
 	shift_key_down = false
 
+	lc = "abcdefghijklmnopqrstuvwxyz"
+	uc = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	# takes an array of positive integers, and encodes it as a string
+	pickle = (a) ->
+		ret = ''
+		for i in a
+			cs = lc
+			r = ''
+			while i > 0 or r is ''
+				digit = i % cs.length
+				i -= digit
+				i /= cs.length
+				r = cs.charAt(digit) + r
+				cs = uc
+			ret += r
+		return ret
+	pickle_widgets = ->
+		ret = '0' # version of this encoding scheme
+		for id, w of widget_layer.all
+			if CSS_CLASS_TO_PICKLE_TYPE[w.css_class]?
+				ret += CSS_CLASS_TO_PICKLE_TYPE[w.css_class]
+				ret += pickle w.as_array()
+		return ret
+	save = ->
+		window.location.hash = pickle_widgets()
 	stop_editing = ->
 		if widget_layer.editing
 			widget_layer.editing.kill_controls()
@@ -557,6 +603,7 @@ init = ->
 			deselect_all widget_layer
 		return
 	mouseup = (e) ->
+		save()
 		mousemove e
 		if dragging
 			selected_count = 0
-- 
1.7.10.4