require("financechart")
class FinanceController < ApplicationController
def index()
@title = "Finance Chart (1)"
@ctrl_file = File.expand_path(__FILE__)
@noOfCharts = 1
render :template => "templates/chartview"
end
#
# Render and deliver the chart
#
def getchart()
# This script can draw different charts depending on the chartIndex
chartIndex = (params["img"]).to_i
# Create a finance chart demo containing 100 days of data
noOfDays = 100
# To compute moving averages starting from the first day, we need to get extra data points
# before the first day
extraDays = 30
# In this exammple, we use a random number generator utility to simulate the data. We set up
# the random table to create 6 cols x (noOfDays + extraDays) rows, using 9 as the seed.
rantable = ChartDirector::RanTable.new(9, 6, noOfDays + extraDays)
# Set the 1st col to be the timeStamp, starting from Sep 4, 2002, with each row representing
# one day, and counting week days only (jump over Sat and Sun)
rantable.setDateCol(0, Time.mktime(2002, 9, 4), 86400, true)
# Set the 2nd, 3rd, 4th and 5th columns to be high, low, open and close data. The open value
# starts from 100, and the daily change is random from -5 to 5.
rantable.setHLOCCols(1, 100, -5, 5)
# Set the 6th column as the vol data from 5 to 25 million
rantable.setCol(5, 50000000, 250000000)
# Now we read the data from the table into arrays
timeStamps = rantable.getCol(0)
highData = rantable.getCol(1)
lowData = rantable.getCol(2)
openData = rantable.getCol(3)
closeData = rantable.getCol(4)
volData = rantable.getCol(5)
# Create a FinanceChart object of width 640 pixels
c = ChartDirector::FinanceChart.new(640)
# Add a title to the chart
c.addTitle("Finance Chart Demonstration")
# Set the data into the finance chart object
c.setData(timeStamps, highData, lowData, openData, closeData, volData, extraDays)
# Add the main chart with 240 pixels in height
c.addMainChart(240)
# Add a 5 period simple moving average to the main chart, using brown color
c.addSimpleMovingAvg(5, 0x663300)
# Add a 20 period simple moving average to the main chart, using purple color
c.addSimpleMovingAvg(20, 0x9900ff)
# Add HLOC symbols to the main chart, using green/red for up/down days
c.addHLOC(0x008000, 0xcc0000)
# Add 20 days bollinger band to the main chart, using light blue (9999ff) as the border and
# semi-transparent blue (c06666ff) as the fill color
c.addBollingerBand(20, 2, 0x9999ff, 0xc06666ff)
# Add a 75 pixels volume bars sub-chart to the bottom of the main chart, using
# green/red/grey for up/down/flat days
c.addVolBars(75, 0x99ff99, 0xff9999, 0x808080)
# Append a 14-days RSI indicator chart (75 pixels high) after the main chart. The main RSI
# line is purple (800080). Set threshold region to +/- 20 (that is, RSI = 50 +/- 25). The
# upper/lower threshold regions will be filled with red (ff0000)/blue (0000ff).
c.addRSI(75, 14, 0x800080, 20, 0xff0000, 0x0000ff)
# Append a 12-days momentum indicator chart (75 pixels high) using blue (0000ff) color.
c.addMomentum(75, 12, 0x0000ff)
# Output the chart
send_data(c.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline")
end
end |