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# Real-time Bar Chart implementation.
class Epoch.Time.Bar extends Epoch.Time.Stack
constructor: (@options={}) ->
@options.type ?= 'time.bar'
super(@options)
@draw()
# @return [Number] An offset used to align the ticks to the center of the rendered bars.
_offsetX: ->
0.5 * @w() / @pixelRatio
# Sets the styles for the graphics context given a layer class name.
# @param [String] className The class name to use when deriving the styles.
setStyles: (className) ->
styles = @getStyles "rect.bar.#{className.replace(/\s/g,'.')}"
@ctx.fillStyle = styles.fill
if !styles.stroke? or styles.stroke == 'none'
@ctx.strokeStyle = 'transparent'
else
@ctx.strokeStyle = styles.stroke
if styles['stroke-width']?
@ctx.lineWidth = styles['stroke-width'].replace('px', '')
# Draws the stacked bar chart.
draw: (delta=0) ->
@clear()
[y, w] = [@y(), @w()]
for layer in @getVisibleLayers()
continue unless Epoch.isNonEmptyArray(layer.values)
@setStyles(layer.className)
[i, k, trans] = [@options.windowSize, layer.values.length, @inTransition()]
iBoundry = if trans then -1 else 0
while (--i >= iBoundry) and (--k >= 0)
entry = layer.values[k]
[ex, ey, ey0] = [i*w+delta, entry.y, entry.y0]
ex += w if trans
args = [ex+1, y(ey+ey0), w-2, @innerHeight()-y(ey)+0.5*@pixelRatio]
@ctx.fillRect.apply(@ctx, args)
@ctx.strokeRect.apply(@ctx, args)
super()
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