V-Bar Meter Orientation

[Ruby On Rails Version - Controller] app/controllers/vbarmeterorientation_controller.rb

require("chartdirector")

class VbarmeterorientationController < ApplicationController

    def index()
        @title = "V-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 = 74.25

        # Bar colors of the meters
        barColor = [0x2299ff, 0x00ee00, 0xaa66ee, 0xff7711]

        # Create a LinearMeter object of size 70 x 240 pixels with very light grey (0xeeeeee)
        # backgruond and a grey (0xaaaaaa) 3-pixel thick rounded frame
        m = ChartDirector::LinearMeter.new(70, 240, 0xeeeeee, 0xaaaaaa)
        m.setRoundedFrame(ChartDirector::Transparent)
        m.setThickFrame(3)

        # This example demonstrates putting the text labels at the left or right side of the meter
        # scale, and putting the color scale on the same side as the labels or on opposite side.
        alignment = [ChartDirector::Left, ChartDirector::Left, ChartDirector::Right,
            ChartDirector::Right]
        meterXPos = [28, 38, 12, 21]
        labelGap = [2, 12, 10, 2]
        colorScalePos = [53, 28, 36, 10]

        # Configure the position of the meter scale and which side to put the text labels
        m.setMeter(meterXPos[chartIndex], 18, 20, 205, alignment[chartIndex])

        # Set meter scale from 0 - 100, with a tick every 10 units
        m.setScale(0, 100, 10)

        # To put the color scale on the same side as the text labels, we need to increase the gap
        # between the labels and the meter scale to make room for the color scale
        m.setLabelPos(false, labelGap[chartIndex])

        # Add a smooth color scale to the meter
        smoothColorScale = [0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000]
        m.addColorScale(smoothColorScale, colorScalePos[chartIndex], 6)

        # 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::Left), 4)

        # Output the chart
        send_data(m.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline")

    end

end

[Ruby On Rails Version - View] app/views/templates/chartview.html.erb

<html>
<body style="margin:5px 0px 0px 5px">

<!-- Title -->
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    <%= @title %>
</div>
<hr style="border:solid 1px #000080" />

<!-- Source Code Listing Link -->
<div style="font-size:9pt; font-family:verdana; margin-bottom:1.5em">
    <%= link_to "Source Code Listing", 
        :controller => "cddemo", :action => "viewsource",
        :ctrl_file => @ctrl_file, :view_file => File.expand_path(__FILE__) %>
</div>

<!-- Create one or more IMG tags to display the demo chart(s) -->
<% 0.upto(@noOfCharts - 1) do |i| %>
    <img src="<%= url_for(:action => "getchart", :img => i) %>">
<% end %>

</body>
</html>

[Command Line Version] rubydemo/vbarmeterorientation.rb

#!/usr/bin/env ruby
require("chartdirector")

def createChart(chartIndex)

    # The value to display on the meter
    value = 74.25

    # Bar colors of the meters
    barColor = [0x2299ff, 0x00ee00, 0xaa66ee, 0xff7711]

    # Create a LinearMeter object of size 70 x 240 pixels with very light grey (0xeeeeee) backgruond
    # and a grey (0xaaaaaa) 3-pixel thick rounded frame
    m = ChartDirector::LinearMeter.new(70, 240, 0xeeeeee, 0xaaaaaa)
    m.setRoundedFrame(ChartDirector::Transparent)
    m.setThickFrame(3)

    # This example demonstrates putting the text labels at the left or right side of the meter
    # scale, and putting the color scale on the same side as the labels or on opposite side.
    alignment = [ChartDirector::Left, ChartDirector::Left, ChartDirector::Right,
        ChartDirector::Right]
    meterXPos = [28, 38, 12, 21]
    labelGap = [2, 12, 10, 2]
    colorScalePos = [53, 28, 36, 10]

    # Configure the position of the meter scale and which side to put the text labels
    m.setMeter(meterXPos[chartIndex], 18, 20, 205, alignment[chartIndex])

    # Set meter scale from 0 - 100, with a tick every 10 units
    m.setScale(0, 100, 10)

    # To put the color scale on the same side as the text labels, we need to increase the gap
    # between the labels and the meter scale to make room for the color scale
    m.setLabelPos(false, labelGap[chartIndex])

    # Add a smooth color scale to the meter
    smoothColorScale = [0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000]
    m.addColorScale(smoothColorScale, colorScalePos[chartIndex], 6)

    # 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::Left), 4)

    # Output the chart
    m.makeChart("vbarmeterorientation%s.png" % chartIndex)
end

createChart(0)
createChart(1)
createChart(2)
createChart(3)