Class: Tk::ParallelCoordinates

Inherits:
Object
  • Object
show all
Defined in:
lib/tk-parallel-coordinates/base.rb

Constant Summary collapse

STATE_NORMAL = 
0
STATE_FILTERED = 
1
STATE_SELECTED = 
2
STATE_CURRENT = 
3
STATES = 
[ 'normal', 'filtered', 'selected', 'current' ]
@@default_colors = 
{
	'labels'   => 'grey75',
	'axis'     => 'steelblue',
	'labels'   => 'steelblue',
	'selector' => 'red',
	'state'    => [ 'grey70', 'grey40', '#999900', 'purple' ]
}
@@scales_in = 
{
	'lin' => proc { |x| x },
	'log' => proc { |x| (x<=0) ? 0 : Math.log(x) },
	'log2' => proc { |x| (x<=0) ? 0 : Math.log(x)/Math.log(2) },
	'log10' => proc { |x| Math.log10(x) },
	'sqrt' => proc { |x| Math.sqrt(x) },
	'3rt' => proc { |x| x ** (1/3.0) },
}
@@scales_out = 
{
	'lin' => proc { |x| x },
	'log' => proc { |x| Math.exp(x) },
	'log2' => proc { |x| 2 ** x },
	'log10' => proc { |x| 10 ** x },
	'sqrt' => proc { |x| x ** 2 },
	'3rt' => proc { |x| x ** 3 },
}

Instance Method Summary collapse

Constructor Details

#initialize(parent, h, w, model) ⇒ ParallelCoordinates

Returns a new instance of ParallelCoordinates.



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# File 'lib/tk-parallel-coordinates/base.rb', line 257

def initialize(parent, h, w, model)
	@model = model
	@canvas = TkCanvas.new(parent) {
		height h
		width w
	}
	@canvas.pack 
	@left_margin = 50
	@right_margin = w - 90
	@top_margin = 10
	@bottom_margin = h - 10
	@draw_width = @right_margin - @left_margin
	@draw_height = @bottom_margin - @top_margin
	@canvas.bind("1", proc{|e| do_press(e.x, e.y)})
	@canvas.bind("B1-Motion", proc{|x, y| do_motion(x, y)}, "%x %y")
	@canvas.bind("ButtonRelease-1", proc{|x, y| do_release(x, y)}, "%x %y")
	@colors = @@default_colors
	@tuples = {}
	draw_axis
end

Instance Method Details

#addtuple(key, state, tuple) ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 65

def addtuple(key,state,tuple)
	if tuple.length != @model.length
		puts "grr... what do I do now?  the tuple you gave me is a different length than the number of axes I have"
		return
	end
	axis = 0
	cx = cy = 0
	tuple.each do |item|
		x = axis2x(axis)
		y = item2y(axis, item)
		if cx > 0
			TkcLine.new(@canvas, cx, cy, x, y, :tags => [ key ], :fill => @colors['state'][state] )
		end
		cx = x
		cy = y
		axis += 1
	end
	@tuples[key] = [state,tuple]
end

#addtuples(tuples) ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 85

def addtuples(tuples)
	tuples.each do |tuple|
		addtuple(tuple)
	end
end

#axis2x(axis) ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 91

def axis2x(axis)
	@model[axis][:x]
end

#do_motion(x, y) ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 211

def do_motion(x, y)
	if @current_rect
		@current_rect.coords @start_x, @start_y, x, y
		@canvas.itemconfigure 'selected', :fill => @colors['state'][STATE_NORMAL]
		@canvas.dtag 'selected'
		@canvas.addtag_overlapping 'selected', @start_x, @start_y, x, y
		@canvas.itemconfigure 'selected', :fill => @colors['state'][STATE_SELECTED]
		@current_rect.fill = ''
		@canvas.itemconfigure 'axis', :fill => @colors['axis']
		@canvas.itemconfigure 'axislabel', :fill => @colors['labels']
		# the below is slow, we need to find a faster way
		@tuples.each do |k,t|
			if t[0] == STATE_FILTERED
				@canvas.itemconfigure k, :fill => @colors['state'][STATE_FILTERED]
			end
		end
	end
end

#do_press(x, y) ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 205

def do_press(x, y)
	@start_x = x
	@start_y = y
	@current_rect = TkcRectangle.new(@canvas, x, y, x, y, :dash => '-', :outline => @colors['selector'])
end

#do_release(x, y) ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 230

def do_release(x, y)
	if @current_rect
		#@canvas.addtag_overlapping 'selected', @start_x, @start_y, x, y
		#@canvas.itemconfigure 'selected', :fill => @colors['state'][STATE_SELECTED]
		@current_rect.delete
		@current_rect = nil
		tuples = []
		# stopped here BOOKMARK
		items = @canvas.find_withtag 'selected'
		items.each do |item|
			item.gettags.each do |tag|
				if tag =~ /\|/ and @tuples[tag][0] != STATE_FILTERED
					tuples.push( tag.split(/\|/) )
				end
			end
		end
		@select_cb.call(tuples) if @select_cb and tuples.length > 0
	end
end

#draw_axis ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 124

def draw_axis
	axes = @model.length
	axes_spacing = @draw_width / (axes - 1.0)
	offset = @left_margin
	axis = 0
	@model.each do |m|
		m[:x] = offset
		#puts "#{offset} #{@top_margin} #{offset} #{@bottom_margin}"
		TkcLine.new(@canvas, offset, @top_margin, offset, @bottom_margin, :tags => ['axis'], :fill => @colors['axis'])
		offset += axes_spacing
		# lin, log, log10, sqrt, 3rt
		if m[:type] == 'range'
			scale = m[:scale]
			s_in = @@scales_in[scale]
			s_out = @@scales_out[scale]
			min = s_in.call m[:min]
			max = s_in.call m[:max]
			del = max - min
			if m[:items]
				m[:items].each do |itemx|
					item = s_in.call itemx
					y = @top_margin + (@draw_height * ((item - min)/(del - min)))
					text = itemx
					text = sprintf m[:ofmt], text if m[:ofmt]
					TkcText.new(@canvas, m[:x], y, :text => text, :anchor => (axis==0) ? 'e' : 'w', :fill => @colors['labels'], :tags => ['axislabel'])
				end
			else
				points = m[:points] || 20.0
				step = del / points.to_f
				item = min
				items = []
				ctext = nil
				(0..points).each do |i|
					y = @top_margin + (@draw_height * ((item - min)/(del - min)))
					text = s_out.call(item)
					text = sprintf m[:ofmt], text if m[:ofmt]
					unless text == ctext
						TkcText.new(@canvas, m[:x], y, :text => text, :anchor => (axis==0) ? 'e' : 'w', :fill => @colors['labels'], :tags => ['axislabel'])
					end
					ctext = text
					items.push item
					item += step
				end
				m[:items] = items
			end
		elsif m[:type] == 'list'
			# skip helps to mitigate overlap.  10.0 is what I assume the font size to be
			skip = (((m[:list].length * 10.0)/@draw_height) + 1).to_i
			item = 0
			items = []
			m[:list].each do |i|
				if item % skip == 0
					y = @top_margin + (@draw_height * (item.to_f/m[:list].length))
					i = sprintf m[:ofmt], i if m[:ofmt]
					TkcText.new(@canvas, m[:x], y, :text => i, :anchor => (axis==0) ? 'e' : 'w', :fill => @colors['labels'], :tags => ['axislabel'])
					items.push i
				end
				item += 1
			end
		elsif m[:type] == 'date'
			min = Date.strptime(m[:min],m[:ifmt])
			max = Date.strptime(m[:max],m[:ifmt])
			item = min
			del = (max - min).to_i
			points = m[:points] || 20.0
			step = del / points.to_f
			(0..points).each do |i|
				y = @top_margin + (@draw_height * (item - min)/(del - min))
				text = item.strftime m[:ofmt]
				TkcText.new(@canvas, m[:x], y, :text => text, :anchor => (axis==0) ? 'e' : 'w', :fill => @colors['labels'], :tags => ['axislabel'])
				item += step
			end
		end
		axis += 1
	end
end

#item2y(axis, item) ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 95

def item2y(axis, item)
	m = @model[axis]
	if m[:type] == 'range'
		scale = m[:scale]
		s_in = @@scales_in[scale]
		s_out = @@scales_out[scale]
		min = s_in.call m[:min]
		max = s_in.call m[:max]
		del = max - min
		y = @top_margin + (@draw_height * ((s_in.call(item) - min)/(del - min)))
		return y
	elsif m[:type] == 'list'
		c = 0
		m[:list].each do |i|
			break if item == i
			c += 1
		end
		y = @top_margin + (@draw_height * (c.to_f/m[:list].length))
		return y
	elsif m[:type] == 'date'
		raise "I must have fmt_in and fmt_out for a time axis.  Use the strftime codes for formatting.  E.g., %s => unix timestamp, %Y-%m-%d => SQL date (2007-12-12)" if m[:ifmt] == nil
		min = Date.strptime(m[:min],m[:ifmt])
		max = Date.strptime(m[:max],m[:ifmt])
		del = (max - min).to_i
		y = @top_margin + (@draw_height * ((Date.strptime(item,m[:ifmt]) - min)/(del - min)))
		return y
	end
end

#pack(*args) ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 49

def pack(*args)
	@canvas.pack(*args)
end

#set_select_cb(callback) ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 201

def set_select_cb(callback)
	@select_cb = callback
end

#set_tuple_state(key, state) ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 59

def set_tuple_state(key,state)
	@canvas.itemconfigure key, :fill => @colors['state'][state]
	@tuples[key][0] = state
	@canvas.raise key, 'all'
end

#setPalette(*args) ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 250

def setPalette(*args)
	return unless args.length > 0
	args[0].each do |k,v|
		@colors[k] = v
	end
end

#update ⇒ Object 



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# File 'lib/tk-parallel-coordinates/base.rb', line 53

def update
	@tuples.each do |k,t|
		@canvas.itemconfigure k, :fill => @colors['state'][t[0]]
	end
end