require("chartdirector")
class ColorhbarmeterController < ApplicationController
def index()
@title = "Color Horizontal Bar 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 = 75.35
# The background, border and bar colors of the meters
bgColor = [0xbbddff, 0xccffcc, 0xffddff, 0xffffaa, 0xffdddd, 0xeeeeee]
borderColor = [0x000088, 0x006600, 0x880088, 0xee6600, 0x880000, 0x666666]
barColor = [0x0088ff, 0x00cc00, 0x8833dd, 0xff8800, 0xee3333, 0x888888]
# Create a LinearMeter object of size 260 x 80 pixels with a 3-pixel thick rounded frame
m = ChartDirector::LinearMeter.new(260, 80, bgColor[chartIndex], borderColor[chartIndex])
m.setRoundedFrame(ChartDirector::Transparent)
m.setThickFrame(3)
# Set the scale region top-left corner at (18, 24), with size of 222 x 20 pixels. The scale
# labels are located on the top (implies horizontal meter)
m.setMeter(18, 24, 222, 20, ChartDirector::Top)
# Set meter scale from 0 - 100, with a tick every 10 units
m.setScale(0, 100, 10)
if chartIndex % 4 == 0
# Add a 5-pixel thick smooth color scale at y = 48 (below the meter scale)
smoothColorScale = [0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000
]
m.addColorScale(smoothColorScale, 48, 5)
elsif chartIndex % 4 == 1
# Add a 5-pixel thick step color scale at y = 48 (below the meter scale)
stepColorScale = [0, 0x00cc00, 50, 0xffdd00, 80, 0xff3333, 100]
m.addColorScale(stepColorScale, 48, 5)
elsif chartIndex % 4 == 2
# Add a 5-pixel thick high/low color scale at y = 48 (below the meter scale)
highLowColorScale = [0, 0x0000ff, 40, ChartDirector::Transparent, 60,
ChartDirector::Transparent, 100, 0xff0000]
m.addColorScale(highLowColorScale, 48, 5)
else
# Add a 5-pixel thick high only color scale at y = 48 (below the meter scale)
highColorScale = [70, ChartDirector::Transparent, 100, 0xff0000]
m.addColorScale(highColorScale, 48, 0, 48, 8)
end
# Add a bar from 0 to value with glass effect and 4 pixel rounded corners
m.addBar(0, value, barColor[chartIndex], ChartDirector::glassEffect(
ChartDirector::NormalGlare, ChartDirector::Top), 4)
# Add a label right aligned to (243, 65) using 8pt Arial Bold font
m.addText(243, 65, "Temperature C", "arialbd.ttf", 8, ChartDirector::TextColor,
ChartDirector::Right)
# Add a text box left aligned to (18, 65). Display the value using white (0xffffff) 8pt
# Arial Bold font on a black (0x000000) background with depressed rounded border.
t = m.addText(18, 65, m.formatValue(value, "2"), "arial.ttf", 8, 0xffffff,
ChartDirector::Left)
t.setBackground(0x000000, 0x000000, -1)
t.setRoundedCorners(3)
# Output the chart
send_data(m.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline")
end
end |