ChartDirector 6.0 (Ruby Edition)
Variable Width Bar Chart
Source Code Listing
require("chartdirector") class VarwidthbarController < ApplicationController def index() @title = "Variable Width Bar 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 = [800, 600, 1000, 1400] widths = [250, 500, 960, 460] labels = ["Wind", "Hydro", "Coal", "Natural Gas"] # The colors to use colors = [0x00aa00, 0x66aaee, 0xee6622, 0xffbb00] # Create a XYChart object of size 500 x 350 pixels c = ChartDirector::XYChart.new(500, 350) # Add a title to the chart using 15pt Arial Italic font c.addTitle("Energy Generation Breakdown", "ariali.ttf", 15) # Set the plotarea at (60, 60) and of (chart_width - 90) x (chart_height - 100) in size. Use # a vertical gradient color from light blue (f9f9ff) to sky blue (aaccff) as background. Set # grid lines to white (ffffff). plotAreaBgColor = c.linearGradientColor(0, 60, 0, c.getHeight() - 40, 0xaaccff, 0xf9fcff) c.setPlotArea(60, 60, c.getWidth() - 90, c.getHeight() - 100, plotAreaBgColor, -1, -1, 0xffffff) # Add a legend box at (50, 30) using horizontal layout and transparent background. c.addLegend(55, 30, false).setBackground(ChartDirector::Transparent) # Add titles to x/y axes with 10 points Arial Bold font c.xAxis().setTitle("Mega Watts", "arialbd.ttf", 10) c.yAxis().setTitle("Cost per MWh (dollars)", "arialbd.ttf", 10) # Set the x axis rounding to false, so that the x-axis will fit the data exactly c.xAxis().setRounding(false, false) # In ChartDirector, there is no bar layer that can have variable bar widths, but you may # create a bar using an area layer. (A bar can be considered as the area under a rectangular # outline.) So by using a loop to create one bar per area layer, we can achieve a variable # width bar chart. # starting position of current bar currentX = 0 0.upto(data.length - 1) do |i| # ending position of current bar nextX = currentX + widths[i] # outline of the bar dataX = [currentX, currentX, nextX, nextX] dataY = [0, data[i], data[i], 0] # create the area layer to fill the bar layer = c.addAreaLayer(dataY, colors[i], labels[i]) layer.setXData(dataX) # the ending position becomes the starting position of the next bar currentX = nextX end # Output the chart send_data(c.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline") end end |
<html> <body style="margin:5px 0px 0px 5px"> <!-- Title --> <div style="font-size:18pt; font-family:verdana; font-weight:bold"> <%= @title %> </div> <hr style="border:solid 1px #000080" /> <!-- Source Code Listing Link --> <div style="font-size:9pt; font-family:verdana; margin-bottom:1.5em"> <%= link_to "Source Code Listing", :controller => "cddemo", :action => "viewsource", :ctrl_file => @ctrl_file, :view_file => File.expand_path(__FILE__) %> </div> <!-- Create one or more IMG tags to display the demo chart(s) --> <% 0.upto(@noOfCharts - 1) do |i| %> <img src="<%= url_for(:action => "getchart", :img => i) %>"> <% end %> </body> </html> |
#!/usr/bin/env ruby require("chartdirector") # The data for the chart data = [800, 600, 1000, 1400] widths = [250, 500, 960, 460] labels = ["Wind", "Hydro", "Coal", "Natural Gas"] # The colors to use colors = [0x00aa00, 0x66aaee, 0xee6622, 0xffbb00] # Create a XYChart object of size 500 x 350 pixels c = ChartDirector::XYChart.new(500, 350) # Add a title to the chart using 15pt Arial Italic font c.addTitle("Energy Generation Breakdown", "ariali.ttf", 15) # Set the plotarea at (60, 60) and of (chart_width - 90) x (chart_height - 100) in size. Use a # vertical gradient color from light blue (f9f9ff) to sky blue (aaccff) as background. Set grid # lines to white (ffffff). plotAreaBgColor = c.linearGradientColor(0, 60, 0, c.getHeight() - 40, 0xaaccff, 0xf9fcff) c.setPlotArea(60, 60, c.getWidth() - 90, c.getHeight() - 100, plotAreaBgColor, -1, -1, 0xffffff) # Add a legend box at (50, 30) using horizontal layout and transparent background. c.addLegend(55, 30, false).setBackground(ChartDirector::Transparent) # Add titles to x/y axes with 10 points Arial Bold font c.xAxis().setTitle("Mega Watts", "arialbd.ttf", 10) c.yAxis().setTitle("Cost per MWh (dollars)", "arialbd.ttf", 10) # Set the x axis rounding to false, so that the x-axis will fit the data exactly c.xAxis().setRounding(false, false) # In ChartDirector, there is no bar layer that can have variable bar widths, but you may create a # bar using an area layer. (A bar can be considered as the area under a rectangular outline.) So by # using a loop to create one bar per area layer, we can achieve a variable width bar chart. # starting position of current bar currentX = 0 0.upto(data.length - 1) do |i| # ending position of current bar nextX = currentX + widths[i] # outline of the bar dataX = [currentX, currentX, nextX, nextX] dataY = [0, data[i], data[i], 0] # create the area layer to fill the bar layer = c.addAreaLayer(dataY, colors[i], labels[i]) layer.setXData(dataX) # the ending position becomes the starting position of the next bar currentX = nextX end # Output the chart c.makeChart("varwidthbar.png") |