require("chartdirector")
class HbarmeterorientationController < ApplicationController
def index()
@title = "H-Bar Meter Orientation"
@ctrl_file = File.expand_path(__FILE__)
@noOfCharts = 4
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 bar colors for the meters
barColor = [0x0088ff, 0x00cc00, 0x8833dd, 0xff8800]
# Create a LinearMeter object of size 260 x 80 pixels with very light grey (0xeeeeee)
# backgruond and a light grey (0xccccccc) 3-pixel thick rounded frame
m = ChartDirector::LinearMeter.new(260, 80, 0xeeeeee, 0xcccccc)
m.setRoundedFrame(ChartDirector::Transparent)
m.setThickFrame(3)
# This example demonstrates putting the text labels at the top or bottom. This is by setting
# the label alignment, as well as the scale, color scale and label positions.
alignment = [ChartDirector::Top, ChartDirector::Top, ChartDirector::Bottom,
ChartDirector::Bottom]
meterYPos = [24, 24, 36, 36]
labelYPos = [65, 65, 16, 16]
colorScalePos = [48, 48, 27, 27]
# Set the scale region
m.setMeter(18, meterYPos[chartIndex], 222, 20, alignment[chartIndex])
# Set meter scale from 0 - 100, with a tick every 10 units
m.setScale(0, 100, 10)
# Add a 5-pixel thick smooth color scale
smoothColorScale = [0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000]
m.addColorScale(smoothColorScale, colorScalePos[chartIndex], 5)
# 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)
#
# In this example, some charts have the "Temperauture" label on the left side and the value
# readout on the right side, and some charts have the reverse
#
if chartIndex % 2 == 0
# Add a label on the left side using 8pt Arial Bold font
m.addText(15, labelYPos[chartIndex], "Temperature C", "arialbd.ttf", 8,
ChartDirector::TextColor, ChartDirector::Left)
# Add a text box on the right side. Display the value using white (0xffffff) 8pt Arial
# Bold font on a black (0x000000) background with depressed rounded border.
t = m.addText(240, labelYPos[chartIndex], m.formatValue(value, "2"), "arial.ttf", 8,
0xffffff, ChartDirector::Right)
t.setBackground(0x000000, 0x000000, -1)
t.setRoundedCorners(3)
else
# Add a label on the right side using 8pt Arial Bold font
m.addText(243, labelYPos[chartIndex], "Temperature C", "arialbd.ttf", 8,
ChartDirector::TextColor, ChartDirector::Right)
# Add a text box on the left side. Display the value using white (0xffffff) 8pt Arial
# Bold font on a black (0x000000) background with depressed rounded border.
t = m.addText(18, labelYPos[chartIndex], m.formatValue(value, "2"), "arial.ttf", 8,
0xffffff, ChartDirector::Left)
t.setBackground(0x000000, 0x000000, -1)
t.setRoundedCorners(3)
end
# Output the chart
send_data(m.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline")
end
end |