ChartDirector 6.0 (Ruby Edition)

Black Horizontal Bar Meters


          

This example demonstrates horizontal bar meters in a black coloring scheme, and with bars in various shading styles.

Source Code Listing

[Ruby On Rails Version - Controller] app/controllers/blackhbarmeter_controller.rb
require("chartdirector")

class BlackhbarmeterController < ApplicationController

    def index()
        @title = "Black 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

        # Create a LinearMeter object of size 260 x 80 pixels with black background and rounded
        # corners
        m = ChartDirector::LinearMeter.new(260, 80, 0x000000)
        m.setRoundedFrame(ChartDirector::Transparent)

        # Set the default text and line colors to white (0xffffff)
        m.setColor(ChartDirector::TextColor, 0xffffff)
        m.setColor(ChartDirector::LineColor, 0xffffff)

        # Set the scale region top-left corner at (15, 24), with size of 228 x 20 pixels. The scale
        # labels are located on the top (implies horizontal meter)
        m.setMeter(15, 24, 228, 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
        smoothColorScale = [0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000]
        stepColorScale = [0, 0x00dd00, 50, 0xffff00, 80, 0xff3333, 100]
        highLowColorScale = [0, 0x0000ff, 40, ChartDirector::Transparent, 60,
            ChartDirector::Transparent, 100, 0xff0000]
        highColorScale = [70, ChartDirector::Transparent, 100, 0xff0000]

        if chartIndex == 0
            # Add a blue (0x0088ff) bar from 0 to value with glass effect and 4 pixel rounded
            # corners
            m.addBar(0, value, 0x0088ff, ChartDirector::glassEffect(ChartDirector::NormalGlare,
                ChartDirector::Top), 4)
            # Add a 5-pixel thick smooth color scale at y = 48 (below the meter scale)
            m.addColorScale(smoothColorScale, 48, 5)
        elsif chartIndex == 1
            # Add a purple (0xaa66ff) bar from 0 to value
            m.addBar(0, value, 0xaa66ff)
            # Add a 4 pixel thick purple (0x880088) frame
            m.setThickFrame(4, 0x880088)
            # Add a 5-pixel thick high/low color scale at y = 48 (below the meter scale)
            m.addColorScale(highLowColorScale, 48, 5)
        elsif chartIndex == 2
             # Add a green (0x00ee00) bar from 0 to value with right side soft lighting effect and 4
             # pixel rounded corners
            m.addBar(0, value, 0x00ee00, ChartDirector::softLighting(ChartDirector::Right), 4)
            # Add a 5-pixel thick step color scale at y = 48 (below the meter scale)
            m.addColorScale(stepColorScale, 48, 5)
        elsif chartIndex == 3
              # Add an orange (0xff8800) bar from 0 to value with cylinder lighting effect
            m.addBar(0, value, 0xff8800, ChartDirector::cylinderEffect())
            # Add a 4 pixel thick brown (0xbb5500) frame
            m.setThickFrame(4, 0xbb5500)
            # Add a 5-pixel thick high only color scale at y = 48 (below the meter scale)
            m.addColorScale(highColorScale, 48, 5)
        elsif chartIndex == 4
             # Add a magneta (0xdd00dd) bar from 0 to value with top side soft lighting effect and 4
             # pixel rounded corners
            m.addBar(0, value, 0xdd00dd, ChartDirector::softLighting(ChartDirector::Top), 4)
            # Add a 5-pixel thick smooth color scale at y = 48 (below the meter scale)
            m.addColorScale(smoothColorScale, 48, 5)
        else
             # Add a red (0xff0000) bar from 0 to value with bar lighting effect
            m.addBar(0, value, 0xff0000, ChartDirector::barLighting())
            # Add a 4 pixel thick red (0xaa0000) frame
            m.setThickFrame(4, 0xaa0000)
               # Add a 5-pixel thick high/low color scale at y = 48 (below the meter scale)
            m.addColorScale(highLowColorScale, 48, 5)
        end

        # Add a label left aligned to (12, 65) using 8pt Arial Bold font
        m.addText(12, 65, "Temperature C", "arialbd.ttf", 8, ChartDirector::TextColor,
            ChartDirector::Left)

        # Add a text box right aligned to (243, 65). Display the value using white (0xffffff) 8pt
        # Arial Bold font on a black (0x000000) background with depressed dark grey (0x333333)
        # rounded border.
        t = m.addText(243, 65, m.formatValue(value, "2"), "arial.ttf", 8, 0xffffff,
            ChartDirector::Right)
        t.setBackground(0x000000, 0x333333, -1)
        t.setRoundedCorners(3)

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

def createChart(chartIndex)

    # The value to display on the meter
    value = 75.35

    # Create a LinearMeter object of size 260 x 80 pixels with black background and rounded corners
    m = ChartDirector::LinearMeter.new(260, 80, 0x000000)
    m.setRoundedFrame(ChartDirector::Transparent)

    # Set the default text and line colors to white (0xffffff)
    m.setColor(ChartDirector::TextColor, 0xffffff)
    m.setColor(ChartDirector::LineColor, 0xffffff)

    # Set the scale region top-left corner at (15, 24), with size of 228 x 20 pixels. The scale
    # labels are located on the top (implies horizontal meter)
    m.setMeter(15, 24, 228, 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
    smoothColorScale = [0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000]
    stepColorScale = [0, 0x00dd00, 50, 0xffff00, 80, 0xff3333, 100]
    highLowColorScale = [0, 0x0000ff, 40, ChartDirector::Transparent, 60,
        ChartDirector::Transparent, 100, 0xff0000]
    highColorScale = [70, ChartDirector::Transparent, 100, 0xff0000]

    if chartIndex == 0
        # Add a blue (0x0088ff) bar from 0 to value with glass effect and 4 pixel rounded corners
        m.addBar(0, value, 0x0088ff, ChartDirector::glassEffect(ChartDirector::NormalGlare,
            ChartDirector::Top), 4)
        # Add a 5-pixel thick smooth color scale at y = 48 (below the meter scale)
        m.addColorScale(smoothColorScale, 48, 5)
    elsif chartIndex == 1
        # Add a purple (0xaa66ff) bar from 0 to value
        m.addBar(0, value, 0xaa66ff)
        # Add a 4 pixel thick purple (0x880088) frame
        m.setThickFrame(4, 0x880088)
        # Add a 5-pixel thick high/low color scale at y = 48 (below the meter scale)
        m.addColorScale(highLowColorScale, 48, 5)
    elsif chartIndex == 2
         # Add a green (0x00ee00) bar from 0 to value with right side soft lighting effect and 4
         # pixel rounded corners
        m.addBar(0, value, 0x00ee00, ChartDirector::softLighting(ChartDirector::Right), 4)
        # Add a 5-pixel thick step color scale at y = 48 (below the meter scale)
        m.addColorScale(stepColorScale, 48, 5)
    elsif chartIndex == 3
          # Add an orange (0xff8800) bar from 0 to value with cylinder lighting effect
        m.addBar(0, value, 0xff8800, ChartDirector::cylinderEffect())
        # Add a 4 pixel thick brown (0xbb5500) frame
        m.setThickFrame(4, 0xbb5500)
        # Add a 5-pixel thick high only color scale at y = 48 (below the meter scale)
        m.addColorScale(highColorScale, 48, 5)
    elsif chartIndex == 4
         # Add a magneta (0xdd00dd) bar from 0 to value with top side soft lighting effect and 4
         # pixel rounded corners
        m.addBar(0, value, 0xdd00dd, ChartDirector::softLighting(ChartDirector::Top), 4)
        # Add a 5-pixel thick smooth color scale at y = 48 (below the meter scale)
        m.addColorScale(smoothColorScale, 48, 5)
    else
         # Add a red (0xff0000) bar from 0 to value with bar lighting effect
        m.addBar(0, value, 0xff0000, ChartDirector::barLighting())
        # Add a 4 pixel thick red (0xaa0000) frame
        m.setThickFrame(4, 0xaa0000)
           # Add a 5-pixel thick high/low color scale at y = 48 (below the meter scale)
        m.addColorScale(highLowColorScale, 48, 5)
    end

    # Add a label left aligned to (12, 65) using 8pt Arial Bold font
    m.addText(12, 65, "Temperature C", "arialbd.ttf", 8, ChartDirector::TextColor,
        ChartDirector::Left)

    # Add a text box right aligned to (243, 65). Display the value using white (0xffffff) 8pt Arial
    # Bold font on a black (0x000000) background with depressed dark grey (0x333333) rounded border.
    t = m.addText(243, 65, m.formatValue(value, "2"), "arial.ttf", 8, 0xffffff, ChartDirector::Right
        )
    t.setBackground(0x000000, 0x333333, -1)
    t.setRoundedCorners(3)

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

createChart(0)
createChart(1)
createChart(2)
createChart(3)
createChart(4)
createChart(5)