require("chartdirector")
class MultisymbollineController < ApplicationController
def index()
@title = "Multi-Symbol Line Chart"
@ctrl_file = File.expand_path(__FILE__)
@noOfCharts = 1
render :template => "templates/chartview"
end
#
# Render and deliver the chart
#
def getchart()
# In this example, the data points are unevenly spaced on the x-axis
dataY = [4.7, 4.7, 6.6, 2.2, 4.7, 4.0, 4.0, 5.1, 4.5, 4.5, 6.8, 4.5, 4, 2.1, 3, 2.5, 2.5,
3.1]
dataX = [Time.mktime(1999, 7, 1), Time.mktime(2000, 1, 1), Time.mktime(2000, 2, 1),
Time.mktime(2000, 4, 1), Time.mktime(2000, 5, 8), Time.mktime(2000, 7, 5), Time.mktime(
2001, 3, 5), Time.mktime(2001, 4, 7), Time.mktime(2001, 5, 9), Time.mktime(2002, 2, 4),
Time.mktime(2002, 4, 4), Time.mktime(2002, 5, 8), Time.mktime(2002, 7, 7), Time.mktime(
2002, 8, 30), Time.mktime(2003, 1, 2), Time.mktime(2003, 2, 16), Time.mktime(2003, 11, 6
), Time.mktime(2004, 1, 4)]
# Data points are assigned different symbols based on point type
pointType = [0, 1, 0, 1, 2, 1, 0, 0, 1, 1, 2, 2, 1, 0, 2, 1, 2, 0]
# Create a XYChart object of size 480 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(480, 320)
c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight() / 2, 0xe8f0f8, 0xaaccff),
0x88aaee)
c.setRoundedFrame()
c.setDropShadow()
# Add a title to the chart using 15 points Arial Italic font. Set top/bottom margins to 12
# pixels.
title = c.addTitle("Multi-Symbol Line Chart Demo", "ariali.ttf", 15)
title.setMargin2(0, 0, 12, 12)
# Tentatively set the plotarea to 50 pixels from the left edge to allow for the y-axis, and
# to just under the title. Set the width to 65 pixels less than the chart width, and the
# height to reserve 90 pixels at the bottom for the x-axis and the legend box. Use pale blue
# (e8f0f8) background, transparent border, and grey (888888) dotted horizontal and vertical
# grid lines.
c.setPlotArea(50, title.getHeight(), c.getWidth() - 65, c.getHeight() - title.getHeight(
) - 90, 0xe8f0f8, -1, ChartDirector::Transparent, c.dashLineColor(0x888888,
ChartDirector::DotLine), -1)
# Add a legend box where the bottom-center is anchored to the 12 pixels above the
# bottom-center of the chart. Use horizontal layout and 8 points Arial font.
legendBox = c.addLegend(c.getWidth() / 2, c.getHeight() - 12, false, "arialbd.ttf", 8)
legendBox.setAlignment(ChartDirector::BottomCenter)
# Set the legend box background and border to pale blue (e8f0f8) and bluish grey (445566)
legendBox.setBackground(0xe8f0f8, 0x445566)
# Use rounded corners of 5 pixel radius for the legend box
legendBox.setRoundedCorners(5)
# Set the y axis label format to display a percentage sign
c.yAxis().setLabelFormat("{value}%")
# Set y-axis title to use 10 points Arial Bold Italic font
c.yAxis().setTitle("Axis Title Placeholder", "arialbi.ttf", 10)
# Set axis labels to use Arial Bold font
c.yAxis().setLabelStyle("arialbd.ttf")
c.xAxis().setLabelStyle("arialbd.ttf")
# We add the different data symbols using scatter layers. The scatter layers are added
# before the line layer to make sure the data symbols stay on top of the line layer.
# We select the points with pointType = 0 (the non-selected points will be set to NoValue),
# and use yellow (ffff00) 15 pixels high 5 pointed star shape symbols for the points. (This
# example uses both x and y coordinates. For charts that have no x explicitly coordinates,
# use an empty array as dataX.)
c.addScatterLayer(dataX, ChartDirector::ArrayMath.new(dataY).selectEQZ(pointType,
ChartDirector::NoValue).result(), "Point Type 0", ChartDirector::StarShape(5), 15,
0xffff00)
# Similar to above, we select the points with pointType - 1 = 0 and use green (ff00) 13
# pixels high six-sided polygon as symbols.
c.addScatterLayer(dataX, ChartDirector::ArrayMath.new(dataY).selectEQZ(
ChartDirector::ArrayMath.new(pointType).sub(1).result(), ChartDirector::NoValue).result(
), "Point Type 1", ChartDirector::PolygonShape(6), 13, 0x00ff00)
# Similar to above, we select the points with pointType - 2 = 0 and use red (ff0000) 13
# pixels high X shape as symbols.
c.addScatterLayer(dataX, ChartDirector::ArrayMath.new(dataY).selectEQZ(
ChartDirector::ArrayMath.new(pointType).sub(2).result(), ChartDirector::NoValue).result(
), "Point Type 2", ChartDirector::Cross2Shape(), 13, 0xff0000)
# Finally, add a blue (0000ff) line layer with line width of 2 pixels
layer = c.addLineLayer(dataY, 0x0000ff)
layer.setXData(dataX)
layer.setLineWidth(2)
# Adjust the plot area size, such that the bounding box (inclusive of axes) is 10 pixels
# from the left edge, just below the title, 25 pixels from the right edge, and 8 pixels
# above the legend box.
c.packPlotArea(10, title.getHeight(), c.getWidth() - 25, c.layoutLegend().getTopY() - 8)
# Output the chart
send_data(c.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline")
end
end |