ChartDirector 6.0 (Ruby Edition)

White Horizontal Linear Meters


      

This example demonstrates horizontal bar meters in a white coloring scheme.

Source Code Listing

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

class WhitehlinearmeterController < ApplicationController

    def index()
        @title = "White Horizontal Linear Meters"
        @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)

        # 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 high low scale at the default position
            m.addColorScale(highLowColorScale)
        elsif chartIndex == 2
            # 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)
        else
            # Add the step color scale at the default position
            m.addColorScale(stepColorScale)
        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

[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/whitehlinearmeter.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)

    # 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 high low scale at the default position
        m.addColorScale(highLowColorScale)
    elsif chartIndex == 2
        # 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)
    else
        # Add the step color scale at the default position
        m.addColorScale(stepColorScale)
    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
    m.makeChart("whitehlinearmeter%s.png" % chartIndex)
end

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