require("chartdirector")
class VectorController < ApplicationController
def index()
@title = "Vector Chart"
@ctrl_file = File.expand_path(__FILE__)
@noOfCharts = 1
render :template => "templates/chartview"
end
#
# Render and deliver the chart
#
def getchart()
# The (x, y) coordinates of the starting point of the vectors
dataX = [20, 40, 60, 80, 100, 20, 40, 60, 80, 100, 20, 40, 58, 62, 80, 100, 20, 40, 60, 80,
100, 20, 40, 60, 80, 100]
dataY = [20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 60, 60, 60, 60, 60, 60, 80, 80, 80, 80, 80,
100, 100, 100, 100, 100]
# The lengths (radii) and directions (angles) of the vectors
dataR = [6, 6, 9, 6, 6, 6, 9, 12, 9, 6, 9, 12, 12, 12, 12, 9, 6, 9, 12, 9, 6, 6, 6, 9, 6, 6]
dataA = [-45, -30, 0, 30, 45, -60, -45, 0, 45, 60, -90, -90, -90, 90, 90, 90, -120, -135,
180, 135, 120, -135, -150, 180, 150, 135]
# Create a XYChart object of size 450 x 390 pixels
c = ChartDirector::XYChart.new(450, 390)
# Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border
# (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
# (0xc0c0c0)
c.setPlotArea(55, 40, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1)
# Add a title to the chart using 18pt Times Bold Itatic font.
c.addTitle("Vector Chart Demonstration", "timesbi.ttf", 18)
# Add a title to the y axis using 12pt Arial Bold Italic font
c.yAxis().setTitle("Y Axis Title", "arialbi.ttf", 12)
# Add a title to the x axis using 12pt Arial Bold Italic font
c.xAxis().setTitle("X Axis Title", "arialbi.ttf", 12)
# Set the axes line width to 3 pixels
c.xAxis().setWidth(3)
c.yAxis().setWidth(3)
# Add a vector layer to the chart using blue (0000CC) color, with vector arrow size set to
# 11 pixels
c.addVectorLayer(dataX, dataY, dataR, dataA, ChartDirector::YAxisScale, 0x0000cc
).setArrowHead(11)
# Output the chart
send_data(c.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline")
end
end |