require("chartdirector")
class PercentbarController < ApplicationController
def index()
@title = "Percentage 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 bar chart
data0 = [100, 125, 245, 147, 67]
data1 = [85, 156, 179, 211, 123]
data2 = [97, 87, 56, 267, 157]
# The labels for the bar chart
labels = ["Mon", "Tue", "Wed", "Thu", "Fri"]
# Create a XYChart object of size 500 x 320 pixels. Use a vertical gradient color from pale
# blue (e8f0f8) to sky blue (aaccff) spanning half the chart height as background. Set
# border to blue (88aaee). Use rounded corners. Enable soft drop shadow.
c = ChartDirector::XYChart.new(500, 320)
c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight() / 2, 0xe8f0f8, 0xaaccff),
0x88aaee)
c.setRoundedFrame()
c.setDropShadow()
# Set directory for loading images to current script directory
c.setSearchPath(File.dirname(__FILE__))
# Add a title to the chart using 15 points Arial Italic. Set top/bottom margins to 15
# pixels.
title = c.addTitle("Weekly Product Sales", "ariali.ttf", 15)
title.setMargin2(0, 0, 15, 15)
# Tentatively set the plotarea to 50 pixels from the left edge, and to just under the title.
# Set the width to 60% of the chart width, and the height to 50 pixels from the bottom edge.
# Use pale blue (e8f0f8) background, transparent border, and grey (aaaaaa) grid lines.
c.setPlotArea(50, title.getHeight(), c.getWidth() * 6 / 10, c.getHeight() - title.getHeight(
) - 50, 0xe8f0f8, -1, ChartDirector::Transparent, 0xaaaaaa)
# Add a legend box where the top-right corner is anchored at 10 pixels from the right edge,
# and just under the title. Use vertical layout and 8 points Arial font.
legendBox = c.addLegend(c.getWidth() - 10, title.getHeight(), true, "arial.ttf", 8)
legendBox.setAlignment(ChartDirector::TopRight)
# Set the legend box background and border to transparent
legendBox.setBackground(ChartDirector::Transparent, ChartDirector::Transparent)
# Set the legend box icon size to 16 x 32 pixels to match with custom icon size
legendBox.setKeySize(16, 32)
# Set axes to transparent
c.xAxis().setColors(ChartDirector::Transparent)
c.yAxis().setColors(ChartDirector::Transparent)
# Set the labels on the x axis
c.xAxis().setLabels(labels)
# Add a percentage bar layer
layer = c.addBarLayer2(ChartDirector::Percentage)
# Add the three data sets to the bar layer, using icons images with labels as data set names
layer.addDataSet(data0, 0x66aaee,
"<*block,valign=absmiddle*><*img=service.png*> Service<*/*>")
layer.addDataSet(data1, 0xeebb22,
"<*block,valign=absmiddle*><*img=software.png*> Software<*/*>")
layer.addDataSet(data2, 0xcc88ff,
"<*block,valign=absmiddle*><*img=computer.png*> Hardware<*/*>")
# Use soft lighting effect with light direction from top
layer.setBorderColor(ChartDirector::Transparent, ChartDirector::softLighting(
ChartDirector::Top))
# Enable data label at the middle of the the bar
layer.setDataLabelStyle().setAlignment(ChartDirector::Center)
# For a vertical stacked chart with positive data only, the last data set is always on top.
# However, in a vertical legend box, the last data set is at the bottom. This can be
# reversed by using the setLegend method.
layer.setLegend(ChartDirector::ReverseLegend)
# Adjust the plot area size, such that the bounding box (inclusive of axes) is 15 pixels
# from the left edge, just below the title, 10 pixels to the right of the legend box, and 15
# pixels from the bottom edge.
c.packPlotArea(15, title.getHeight(), c.layoutLegend().getLeftX() - 10, c.getHeight() - 15)
# Output the chart
send_data(c.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline")
end
end |