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+# Base class for all two-dimensional basic d3 charts. This class handles axes and
+# margins so that subclasses can focus on the construction of particular chart
+# types.
+class Epoch.Chart.Plot extends Epoch.Chart.SVG
+ defaults =
+ domain: null,
+ range: null,
+ axes: ['left', 'bottom']
+ ticks:
+ top: 14
+ bottom: 14
+ left: 5
+ right: 5
+ tickFormats:
+ top: Epoch.Formats.regular
+ bottom: Epoch.Formats.regular
+ left: Epoch.Formats.si
+ right: Epoch.Formats.si
+
+ defaultAxisMargins =
+ top: 25
+ right: 50
+ bottom: 25
+ left: 50
+
+ optionListeners =
+ 'option:margins.top': 'marginsChanged'
+ 'option:margins.right': 'marginsChanged'
+ 'option:margins.bottom': 'marginsChanged'
+ 'option:margins.left': 'marginsChanged'
+ 'option:axes': 'axesChanged'
+ 'option:ticks.top': 'ticksChanged'
+ 'option:ticks.right': 'ticksChanged'
+ 'option:ticks.bottom': 'ticksChanged'
+ 'option:ticks.left': 'ticksChanged'
+ 'option:tickFormats.top': 'tickFormatsChanged'
+ 'option:tickFormats.right': 'tickFormatsChanged'
+ 'option:tickFormats.bottom': 'tickFormatsChanged'
+ 'option:tickFormats.left': 'tickFormatsChanged'
+ 'option:domain': 'domainChanged'
+ 'option:range': 'rangeChanged'
+
+ # Creates a new plot chart.
+ # @param [Object] options Options to use when constructing the plot.
+ # @option options [Object] margins For setting explicit values for the top,
+ # right, bottom, and left margins in the visualization. Normally these can
+ # be omitted and the class will set appropriately sized margins given which
+ # axes are specified.
+ # @option options [Array] axes A list of axes to display (top, left, bottom, right).
+ # @option options [Object] ticks Number of ticks to place on the top, left bottom
+ # and right axes.
+ # @option options [Object] tickFormats What tick formatting functions to use for
+ # the top, bottom, left, and right axes.
+ constructor: (@options={}) ->
+ givenMargins = Epoch.Util.copy(@options.margins) or {}
+ super(@options = Epoch.Util.defaults(@options, defaults))
+
+ # Margins are used in a special way and only for making room for axes.
+ # However, a user may explicitly set margins in the options, so we need
+ # to determine if they did so, and zero out the ones they didn't if no
+ # axis is present.
+ @margins = {}
+ for pos in ['top', 'right', 'bottom', 'left']
+ @margins[pos] = if @options.margins? and @options.margins[pos]?
+ @options.margins[pos]
+ else if @hasAxis(pos)
+ defaultAxisMargins[pos]
+ else
+ 6
+
+ # Add a translation for the top and left margins
+ @g = @svg.append("g")
+ .attr("transform", "translate(#{@margins.left}, #{@margins.top})")
+
+ # Register option change events
+ @onAll optionListeners
+
+ # Sets the tick formatting function to use on the given axis.
+ # @param [String] axis Name of the axis.
+ # @param [Function] fn Formatting function to use.
+ setTickFormat: (axis, fn) ->
+ @options.tickFormats[axis] = fn
+
+ # @return [Boolean] <code>true</code> if the chart has an axis with a given name, <code>false</code> otherwise.
+ # @param [String] axis Name of axis to check.
+ hasAxis: (axis) ->
+ @options.axes.indexOf(axis) > -1
+
+ # @return [Number] Width of the visualization portion of the chart (width - margins).
+ innerWidth: ->
+ @width - (@margins.left + @margins.right)
+
+ # @return [Number] Height of the visualization portion of the chart (height - margins).
+ innerHeight: ->
+ @height - (@margins.top + @margins.bottom)
+
+ # @return [Function] The x scale for the visualization.
+ x: ->
+ domain = @options.domain ? @extent((d) -> d.x)
+ d3.scale.linear()
+ .domain(domain)
+ .range([0, @innerWidth()])
+
+ # @return [Function] The y scale for the visualization.
+ y: (givenDomain) ->
+ d3.scale.linear()
+ .domain(@_getScaleDomain(givenDomain))
+ .range([@innerHeight(), 0])
+
+ # @return [Function] d3 axis to use for the bottom of the visualization.
+ bottomAxis: ->
+ d3.svg.axis().scale(@x()).orient('bottom')
+ .ticks(@options.ticks.bottom)
+ .tickFormat(@options.tickFormats.bottom)
+
+ # @return [Function] d3 axis to use for the top of the visualization.
+ topAxis: ->
+ d3.svg.axis().scale(@x()).orient('top')
+ .ticks(@options.ticks.top)
+ .tickFormat(@options.tickFormats.top)
+
+ # @return [Function] d3 axis to use on the left of the visualization.
+ leftAxis: ->
+ range = if @options.range then @options.range.left else null
+ d3.svg.axis().scale(@y(range)).orient('left')
+ .ticks(@options.ticks.left)
+ .tickFormat(@options.tickFormats.left)
+
+ # @return [Function] d3 axis to use on the right of the visualization.
+ rightAxis: ->
+ range = if @options.range then @options.range.right else null
+ d3.svg.axis().scale(@y(range)).orient('right')
+ .ticks(@options.ticks.right)
+ .tickFormat(@options.tickFormats.right)
+
+ # Renders the axes for the visualization (subclasses must implement specific
+ # drawing routines).
+ draw: ->
+ if @_axesDrawn
+ @_redrawAxes()
+ else
+ @_drawAxes()
+ super()
+
+ # Redraws the axes for the visualization.
+ _redrawAxes: ->
+ if @hasAxis('bottom')
+ @g.selectAll('.x.axis.bottom').transition()
+ .duration(500)
+ .ease('linear')
+ .call(@bottomAxis())
+ if @hasAxis('top')
+ @g.selectAll('.x.axis.top').transition()
+ .duration(500)
+ .ease('linear')
+ .call(@topAxis())
+ if @hasAxis('left')
+ @g.selectAll('.y.axis.left').transition()
+ .duration(500)
+ .ease('linear')
+ .call(@leftAxis())
+ if @hasAxis('right')
+ @g.selectAll('.y.axis.right').transition()
+ .duration(500)
+ .ease('linear')
+ .call(@rightAxis())
+
+ # Draws the initial axes for the visualization.
+ _drawAxes: ->
+ if @hasAxis('bottom')
+ @g.append("g")
+ .attr("class", "x axis bottom")
+ .attr("transform", "translate(0, #{@innerHeight()})")
+ .call(@bottomAxis())
+ if @hasAxis('top')
+ @g.append("g")
+ .attr('class', 'x axis top')
+ .call(@topAxis())
+ if @hasAxis('left')
+ @g.append("g")
+ .attr("class", "y axis left")
+ .call(@leftAxis())
+ if @hasAxis('right')
+ @g.append('g')
+ .attr('class', 'y axis right')
+ .attr('transform', "translate(#{@innerWidth()}, 0)")
+ .call(@rightAxis())
+ @_axesDrawn = true
+
+ dimensionsChanged: ->
+ super()
+ @g.selectAll('.axis').remove()
+ @_axesDrawn = false
+ @draw()
+
+ # Updates margins in response to a <code>option:margin.*</code> event.
+ marginsChanged: ->
+ return unless @options.margins?
+ for own pos, size of @options.margins
+ unless size?
+ @margins[pos] = 6
+ else
+ @margins[pos] = size
+
+ @g.transition()
+ .duration(750)
+ .attr("transform", "translate(#{@margins.left}, #{@margins.top})")
+
+ @draw()
+
+ # Updates axes in response to a <code>option:axes</code> event.
+ axesChanged: ->
+ # Remove default axis margins
+ for pos in ['top', 'right', 'bottom', 'left']
+ continue if @options.margins? and @options.margins[pos]?
+ if @hasAxis(pos)
+ @margins[pos] = defaultAxisMargins[pos]
+ else
+ @margins[pos] = 6
+
+ # Update the margin offset
+ @g.transition()
+ .duration(750)
+ .attr("transform", "translate(#{@margins.left}, #{@margins.top})")
+
+ # Remove the axes and redraw
+ @g.selectAll('.axis').remove()
+ @_axesDrawn = false
+ @draw()
+
+ # Updates ticks in response to a <code>option:ticks.*</code> event.
+ ticksChanged: -> @draw()
+
+ # Updates tick formats in response to a <code>option:tickFormats.*</code> event.
+ tickFormatsChanged: -> @draw()
+
+ # Updates chart in response to a <code>option:domain</code> event.
+ domainChanged: -> @draw()
+
+ # Updates chart in response to a <code>option:range</code> event.
+ rangeChanged: -> @draw()
+
+# "They will see us waving from such great heights, come down now..." - The Postal Service
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