require("chartdirector")
class MultihmeterController < ApplicationController
def index()
@title = "Multi-Pointer Horizontal 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 250 x 75 pixels, using silver background
# with a 2 pixel black 3D depressed border.
m = ChartDirector::LinearMeter.new(250, 75, ChartDirector::silverColor(), 0, -2)
# Set the scale region top-left corner at (15, 25), with size of 220 x 20 pixels.
# The scale labels are located on the top (implies horizontal meter)
m.setMeter(15, 25, 220, 20, ChartDirector::Top)
# 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 label at bottom-left (10, 68) using Arial Bold/8 pts/red (c00000)
m.addText(10, 68, "Temp C", "arialbd.ttf", 8, 0xc00000, ChartDirector::BottomLeft)
# Add three text boxes to show the values in this meter
m.addText(148, 70, m.formatValue(value0, "2"), "arial.ttf", 8, 0x6666ff,
ChartDirector::BottomRight).setBackground(0, 0, -1)
m.addText(193, 70, m.formatValue(value1, "2"), "arial.ttf", 8, 0x33ff33,
ChartDirector::BottomRight).setBackground(0, 0, -1)
m.addText(238, 70, m.formatValue(value2, "2"), "arial.ttf", 8, 0xff3333,
ChartDirector::BottomRight).setBackground(0, 0, -1)
# output the chart
send_data(m.makeChart2(ChartDirector::PNG), :type => "image/png",
:disposition => "inline")
end
end |