require("chartdirector")
class RoseController < ApplicationController
def index()
@title = "Simple Rose Chart"
@ctrl_file = File.expand_path(__FILE__)
@noOfCharts = 1
render :template => "templates/chartview"
end
#
# Render and deliver the chart
#
def getchart()
# Data for the chart
data = [9.4, 1.8, 2.1, 2.3, 3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3, 5.1, 2.6, 1.5,
2.2, 5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5]
angles = [0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225,
240, 255, 270, 285, 300, 315, 330, 345]
# Create a PolarChart object of size 460 x 460 pixels, with a silver background
# and a 1 pixel 3D border
c = ChartDirector::PolarChart.new(460, 460, ChartDirector::silverColor(),
0x000000, 1)
# Add a title to the chart at the top left corner using 15pts Arial Bold Italic
# font. Use white text on deep blue background.
c.addTitle("Polar Vector Chart Demonstration", "arialbi.ttf", 15, 0xffffff
).setBackground(0x000080)
# Set plot area center at (230, 240) with radius 180 pixels and white background
c.setPlotArea(230, 240, 180, 0xffffff)
# Set the grid style to circular grid
c.setGridStyle(false)
# Set angular axis as 0 - 360, with a spoke every 30 units
c.angularAxis().setLinearScale(0, 360, 30)
# Add sectors to the chart as sector zones
0.upto(data.length - 1) do |i|
c.angularAxis().addZone(angles[i], angles[i] + 15, 0, data[i], 0x33ff33,
0x008000)
end
# Add an Transparent invisible layer to ensure the axis is auto-scaled using the
# data
c.addLineLayer(data, ChartDirector::Transparent)
# output the chart
send_data(c.makeChart2(ChartDirector::PNG), :type => "image/png",
:disposition => "inline")
end
end |