require("chartdirector")
class ParetoController < ApplicationController
def index()
@title = "Pareto Chart"
@ctrl_file = File.expand_path(__FILE__)
@noOfCharts = 1
render :template => "templates/chartview"
end
#
# Render and deliver the chart
#
def getchart()
# The data for the chart
data = [40, 15, 7, 5, 2]
# The labels for the chart
labels = ["Hard Disk", "PCB", "Printer", "CDROM", "Keyboard"]
# In the pareto chart, the line data are just the accumulation of the raw data,
# scaled to a range of 0 - 100%
lineData = ChartDirector::ArrayMath.new(data)
lineData.acc()
scaleFactor = lineData.max() / 100
if scaleFactor == 0
# Avoid division by zero error for zero data
scaleFactor = 1
end
lineData.div2(scaleFactor)
# Create a XYChart object of size 480 x 300 pixels. Set background color to
# brushed silver, with a grey (bbbbbb) border and 2 pixel 3D raised effect. Use
# rounded corners. Enable soft drop shadow.
c = ChartDirector::XYChart.new(400, 300, ChartDirector::brushedSilverColor(),
0xbbbbbb, 2)
c.setRoundedFrame()
c.setDropShadow()
# Add a title to the chart using 15 points Arial Italic. Set top/bottom margins to
# 12 pixels.
title = c.addTitle("Pareto Chart Demonstration", "ariali.ttf", 15)
title.setMargin2(0, 0, 12, 12)
# Tentatively set the plotarea at (50, 40). Set the width to 100 pixels less than
# the chart width, and the height to 80 pixels less than the chart height. Use
# pale grey (f4f4f4) background, transparent border, and dark grey (444444) dotted
# grid lines.
c.setPlotArea(50, 40, c.getWidth() - 100, c.getHeight() - 80, 0xf4f4f4, -1,
ChartDirector::Transparent, c.dashLineColor(0x444444, ChartDirector::DotLine))
# Add a line layer for the pareto line
lineLayer = c.addLineLayer2()
# Add the pareto line using deep blue (0000ff) as the color, with circle symbols
lineLayer.addDataSet(lineData.result(), 0x0000ff).setDataSymbol(
ChartDirector::CircleShape, 9, 0x0000ff, 0x0000ff)
# Set the line width to 2 pixel
lineLayer.setLineWidth(2)
# Bind the line layer to the secondary (right) y-axis.
lineLayer.setUseYAxis2()
# Add a multi-color bar layer using the given data.
barLayer = c.addBarLayer3(data)
# Set soft lighting for the bars with light direction from the right
barLayer.setBorderColor(ChartDirector::Transparent, ChartDirector::softLighting(
ChartDirector::Right))
# Set the labels on the x axis.
c.xAxis().setLabels(labels)
# Set the secondary (right) y-axis scale as 0 - 100 with a tick every 20 units
c.yAxis2().setLinearScale(0, 100, 20)
# Set the format of the secondary (right) y-axis label to include a percentage
# sign
c.yAxis2().setLabelFormat("{value}%")
# Set the relationship between the two y-axes, which only differ by a scaling
# factor
c.yAxis().syncAxis(c.yAxis2(), scaleFactor)
# Set the format of the primary y-axis label foramt to show no decimal point
c.yAxis().setLabelFormat("{value|0}")
# Add a title to the primary y-axis
c.yAxis().setTitle("Frequency")
# Set all axes to transparent
c.xAxis().setColors(ChartDirector::Transparent)
c.yAxis().setColors(ChartDirector::Transparent)
c.yAxis2().setColors(ChartDirector::Transparent)
# Adjust the plot area size, such that the bounding box (inclusive of axes) is 10
# pixels from the left edge, just below the title, 10 pixels from the right edge,
# and 20 pixels from the bottom edge.
c.packPlotArea(10, title.getHeight(), c.getWidth() - 10, c.getHeight() - 20)
# Output the chart
send_data(c.makeChart2(ChartDirector::JPG), :type => "image/jpeg",
:disposition => "inline")
end
end |