require("chartdirector")
class ColorvlinearmeterController < ApplicationController
def index()
@title = "Color Vertical Linear Meters"
@ctrl_file = File.expand_path(__FILE__)
@noOfCharts = 6
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
# The value to display on the meter
value = 74.25
# The background and border colors of the meters
bgColor = [0xbbddff, 0xccffcc, 0xffccff, 0xffffaa, 0xffdddd, 0xeeeeee]
borderColor = [0x000088, 0x006600, 0x6600aa, 0xee6600, 0x880000, 0x666666]
# Create a LinearMeter object of size 70 x 260 pixels with a 3-pixel thick rounded frame
m = ChartDirector::LinearMeter.new(70, 260, bgColor[chartIndex], borderColor[chartIndex])
m.setRoundedFrame(ChartDirector::Transparent)
m.setThickFrame(3)
# Set the scale region top-left corner at (28, 30), with size of 20 x 200 pixels. The scale
# labels are located on the left (default - implies vertical meter)
m.setMeter(28, 30, 20, 200)
# Set meter scale from 0 - 100, with a tick every 10 units
m.setScale(0, 100, 10)
# Demostrate different types of color scales and putting them at different positions
smoothColorScale = [0, 0x6666ff, 25, 0x00bbbb, 50, 0x00ff00, 75, 0xffff00, 100, 0xff0000]
stepColorScale = [0, 0x33ff33, 50, 0xffff33, 80, 0xff3333, 100]
highLowColorScale = [0, 0x6666ff, 70, ChartDirector::Transparent, 100, 0xff0000]
if chartIndex == 0
# Add the smooth color scale at the default position
m.addColorScale(smoothColorScale)
elsif chartIndex == 1
# Add the step color scale at the default position
m.addColorScale(stepColorScale)
elsif chartIndex == 2
# Add the high low scale at the default position
m.addColorScale(highLowColorScale)
elsif chartIndex == 3
# Add the smooth color scale starting at x = 28 (left of scale) with zero width and
# ending at x = 28 with 20 pixels width
m.addColorScale(smoothColorScale, 28, 0, 28, 20)
elsif chartIndex == 4
# Add the smooth color scale starting at x = 38 (center of scale) with zero width and
# ending at x = 28 with 20 pixels width
m.addColorScale(smoothColorScale, 38, 0, 28, 20)
else
# Add the smooth color scale starting at x = 48 (right of scale) with zero width and
# ending at x = 28 with 20 pixels width
m.addColorScale(smoothColorScale, 48, 0, 28, 20)
end
# Add a blue (0x0000cc) pointer at the specified value
m.addPointer(value, 0x0000cc)
# Add a title using white (0xffffff) 8pt Arial Bold font with a border color background
m.addTitle("Temp C", "arialbd.ttf", 8, 0xffffff).setBackground(borderColor[chartIndex])
# Add a bottom title using white (0xffffff) 8pt Arial Bold font with a border color
# background to display the value
m.addTitle2(ChartDirector::Bottom, m.formatValue(value, "2"), "arialbd.ttf", 8, 0xffffff
).setBackground(borderColor[chartIndex])
# Output the chart
send_data(m.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline")
end
end |