H-Linear Meter Orientation

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

require("chartdirector")

class HlinearmeterorientationController < ApplicationController

    def index()
        @title = "H-Linear 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

        # Create a LinearMeter object of size 250 x 75 pixels with very light grey (0xeeeeee)
        # backgruond and a light grey (0xccccccc) 3-pixel thick rounded frame
        m = ChartDirector::LinearMeter.new(250, 75, 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, scale position and label position.
        alignment = [ChartDirector::Top, ChartDirector::Top, ChartDirector::Bottom,
            ChartDirector::Bottom]
        meterYPos = [23, 23, 34, 34]
        labelYPos = [61, 61, 15, 15]

        # Set the scale region
        m.setMeter(14, meterYPos[chartIndex], 218, 20, alignment[chartIndex])

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

        # Add a smooth color scale at the default position
        smoothColorScale = [0, 0x6666ff, 25, 0x00bbbb, 50, 0x00ff00, 75, 0xffff00, 100, 0xff0000]
        m.addColorScale(smoothColorScale)

        # Add a blue (0x0000cc) pointer at the specified value
        m.addPointer(value, 0x0000cc)

        #
        # 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(10, 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(235, labelYPos[chartIndex], m.formatValue(value, "2"), "arialbd.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(237, 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(11, labelYPos[chartIndex], m.formatValue(value, "2"), "arialbd.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

[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/hlinearmeterorientation.rb

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

def createChart(chartIndex)

    # The value to display on the meter
    value = 74.25

    # Create a LinearMeter object of size 250 x 75 pixels with very light grey (0xeeeeee) backgruond
    # and a light grey (0xccccccc) 3-pixel thick rounded frame
    m = ChartDirector::LinearMeter.new(250, 75, 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, scale position and label position.
    alignment = [ChartDirector::Top, ChartDirector::Top, ChartDirector::Bottom,
        ChartDirector::Bottom]
    meterYPos = [23, 23, 34, 34]
    labelYPos = [61, 61, 15, 15]

    # Set the scale region
    m.setMeter(14, meterYPos[chartIndex], 218, 20, alignment[chartIndex])

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

    # Add a smooth color scale at the default position
    smoothColorScale = [0, 0x6666ff, 25, 0x00bbbb, 50, 0x00ff00, 75, 0xffff00, 100, 0xff0000]
    m.addColorScale(smoothColorScale)

    # Add a blue (0x0000cc) pointer at the specified value
    m.addPointer(value, 0x0000cc)

    #
    # 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(10, 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(235, labelYPos[chartIndex], m.formatValue(value, "2"), "arialbd.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(237, 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(11, labelYPos[chartIndex], m.formatValue(value, "2"), "arialbd.ttf", 8,
            0xffffff, ChartDirector::Left)
        t.setBackground(0x000000, 0x000000, -1)
        t.setRoundedCorners(3)
    end

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

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