require("chartdirector")
class MultivmeterController < ApplicationController
def index()
@title = "Multi-Pointer Vertical Meter"
@ctrl_file = File.expand_path(__FILE__)
@noOfCharts = 1
render :template => "templates/chartview"
end
#
# Render and deliver the chart
#
def getchart()
# The values to display on the meter
value0 = 30.99
value1 = 45.35
value2 = 77.64
# Create an LinearMeter object of size 60 x 245 pixels, using silver background
# with a 2 pixel black 3D depressed border.
m = ChartDirector::LinearMeter.new(60, 245, ChartDirector::silverColor(), 0, -2)
# Set the scale region top-left corner at (25, 30), with size of 20 x 200 pixels.
# The scale labels are located on the left (default - implies vertical meter)
m.setMeter(25, 30, 20, 200)
# Set meter scale from 0 - 100, with a tick every 10 units
m.setScale(0, 100, 10)
# Set 0 - 50 as green (99ff99) zone, 50 - 80 as yellow (ffff66) zone, and 80 - 100
# as red (ffcccc) zone
m.addZone(0, 50, 0x99ff99)
m.addZone(50, 80, 0xffff66)
m.addZone(80, 100, 0xffcccc)
# Add deep red (000080), deep green (008000) and deep blue (800000) pointers to
# reflect the values
m.addPointer(value0, 0x000080)
m.addPointer(value1, 0x008000)
m.addPointer(value2, 0x800000)
# Add a text box label at top-center (30, 5) using Arial Bold/8 pts/deep blue
# (000088), with a light blue (9999ff) background
m.addText(30, 5, "Temp C", "arialbd.ttf", 8, 0x000088, ChartDirector::TopCenter
).setBackground(0x9999ff)
# Output the chart
send_data(m.makeChart2(ChartDirector::PNG), :type => "image/png",
:disposition => "inline")
end
end |