require("chartdirector")
class ColorhlinearmeterController < ApplicationController
def index()
@title = "Color Horizontal 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 250 x 75 pixels with a 3-pixel thick rounded frame
m = ChartDirector::LinearMeter.new(250, 75, bgColor[chartIndex], borderColor[chartIndex])
m.setRoundedFrame(ChartDirector::Transparent)
m.setThickFrame(3)
# Set the scale region top-left corner at (14, 23), with size of 218 x 20 pixels. The scale
# labels are located on the top (implies horizontal meter)
m.setMeter(14, 23, 218, 20, ChartDirector::Top)
# 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 y = 23 (top of scale) with zero width and
# ending at y = 23 with 20 pixels width
m.addColorScale(smoothColorScale, 23, 0, 23, 20)
elsif chartIndex == 4
# Add the smooth color scale starting at y = 33 (center of scale) with zero width and
# ending at y = 23 with 20 pixels width
m.addColorScale(smoothColorScale, 33, 0, 23, 20)
else
# Add the smooth color scale starting at y = 43 (bottom of scale) with zero width and
# ending at y = 23 with 20 pixels width
m.addColorScale(smoothColorScale, 43, 0, 23, 20)
end
# Add a blue (0x0000cc) pointer at the specified value
m.addPointer(value, 0x0000cc)
# Add a label left aligned to (10, 61) using 8pt Arial Bold font
m.addText(10, 61, "Temperature C", "arialbd.ttf", 8, ChartDirector::TextColor,
ChartDirector::Left)
# Add a text box right aligned to (235, 61). Display the value using white (0xffffff) 8pt
# Arial Bold font on a black (0x000000) background with depressed rounded border.
t = m.addText(235, 61, m.formatValue(value, "2"), "arialbd.ttf", 8, 0xffffff,
ChartDirector::Right)
t.setBackground(0x000000, 0x000000, -1)
t.setRoundedCorners(3)
# Output the chart
send_data(m.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline")
end
end |