### Home Classes Methods

### In Files

- lib/taskjuggler/reports/ChartPlotter.rb

### Parent

Object

### Methods

- ::new
- #generate
- #to_svg

### Files

- CHANGELOG
- COPYING
- README.rdoc

### Class/Module Index

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- Diff
- Diff::Hunk
- AppConfig
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- DiffableString
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- RuntimeConfig
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No matching classes.

# TaskJuggler::ChartPlotter

### Public Class Methods

new(width, height, data) click to toggle source

    # File lib/taskjuggler/reports/ChartPlotter.rb, line 21
    def initialize(width, height, data)
      # +------------------------------------------------
      # |             ^
      # |   topMargin |             legendGap
      # |             v             <->
      # |              |               -x- foo
      # |<-leftMargin->|               -x- bar
      # |              |               <-legend
      # |              |                 Width---->
      # |              +------------
      # |             ^             <-rightMargin->
      # | bottomMargin|
      # |             v
      # +------------------------------------------------
      # <-----------------canvasWidth-------------------->
      # The width of the canvas area
      @width = width
      # The height of the canvas area
      @height = height
      # The raw data to plot as loaded from the CSV file.
      @data = data

      # The margins between the graph plotting area and the canvas borders.
      @topMargin = 30
      @bottomMargin = 30
      @leftMargin = 70
      @rightMargin = (@width * 0.382).to_i

      @legendGap = 20
      @markerWidth = 20
      @markerX = @width - @rightMargin + @legendGap
      @markerGap = 5
      @labelX = @markerX + @markerWidth + @markerGap
      @labelHeight = 24

      # The location of the 0/0 point of the graph plotter.
      @x0 = @leftMargin
      @y0 = @height - @bottomMargin

      @labels = []
      @yData = []
      @xData = nil
      @dataType = nil
      @xMinDate = nil
      @xMaxDate = nil
      @yMinDate = nil
      @yMaxDate = nil
      @yMinVal = nil
      @yMaxVal = nil
    end

### Public Instance Methods

generate() click to toggle source

Create the chart as Painter object.

    # File lib/taskjuggler/reports/ChartPlotter.rb, line 73
    def generate
      analyzeData
      calcChartGeometry
      @painter = Painter.new(@width, @height) do |pa|
        drawGrid(pa)
        0.upto(@yData.length - 1) do |ci|
          # Compute a unique and distinguishable color for each data set. We
          # primarily use the hue value of the HSV color space for this. It
          # has 6 main colors each 60 degrees apart from each other. After the
          # first 360 round, we shift the angle by 60 / round so we get a
          # different color set than in the previous round. Additionally, the
          # saturation is decreased with each data set.
          color = Painter::Color.new(
            (60 * (ci % 6) + (60 / (1 + ci / 6))) % 360,
            255 - (ci / 8), 230, :hsv)

          drawDataGraph(pa, ci, color)
          drawLegendEntry(pa, ci, color)
        end
      end
    end

to_svg() click to toggle source

    # File lib/taskjuggler/reports/ChartPlotter.rb, line 95
    def to_svg
      @painter.to_svg
    end

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