ChartDirector 6.0 (Ruby Edition)

Black Vertical Bar Meters


          

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

Source Code Listing

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

class BlackvbarmeterController < ApplicationController

    def index()
        @title = "Black Vertical 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 = 66.77

        # Create a LinearMeter object of size 70 x 260 pixels with black background and rounded
        # corners
        m = ChartDirector::LinearMeter.new(70, 260, 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 (36, 30), with size of 20 x 196 pixels. The scale
        # labels are located on the left (default - implies vertical meter).
        m.setMeter(36, 30, 20, 196)

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

        # Add the chart title at the top center
        title = m.addText(m.getWidth() / 2, 5, "Temp C", "arialbd.ttf", 8, ChartDirector::TextColor,
            ChartDirector::TopCenter)

        # Move the scale labels 8 pixels from the meter scale to make room for the color scale
        m.setLabelPos(false, 8)

        # Demostrate different types of color scales
        smoothColorScale = [0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000]
        stepColorScale = [0, 0x00dd00, 50, 0xffff00, 80, 0xff0000, 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::Left), 4)
            # Add a 4-pixel thick smooth color scale at x = 29 (left of meter scale)
            m.addColorScale(smoothColorScale, 29, 4)
        elsif chartIndex == 1
             # Add a yellow (0xCC9922) bar from 0 to value with bar lighting effect
            m.addBar(0, value, 0xcc9922, ChartDirector::barLighting())
            # Add a 4-pixel thick smooth color scale at x = 29 (left of meter scale)
            m.addColorScale(smoothColorScale, 29, 4)

            # Set the title style to black text on a yellow (0xcc9922) background with rounded
            # corners
            title.setFontColor(0x000000)
            title.setBackground(0xcc9922)
            title.setRoundedCorners(2)
        elsif chartIndex == 2
             # Add a grey (0xaaaaaa) bar from 0 to value with bar lighting effect
            m.addBar(0, value, 0xaaaaaa, ChartDirector::barLighting())
            # Add a 4-pixel high/low color scale at x = 29 (left of meter scale)
            m.addColorScale(highLowColorScale, 29, 4)
        elsif chartIndex == 3
             # Add a brown (0xbb6622) bar from 0 to value with cylinder lighting effect
            m.addBar(0, value, 0xbb6622, ChartDirector::cylinderEffect())
            # Add a 4 pixel thick brown (0xbb6622) frame
            m.setThickFrame(4, 0xbb6622)
            # Add a high only color scale at x = 29 (left of meter scale)
            m.addColorScale(highColorScale, 29, 4)
        elsif chartIndex == 4
            # Add a purple (0x7755ee) bar from 0 to value
            m.addBar(0, value, 0x7755ee)
            # Add a 4 pixel thick purple (0x880088) frame
            m.setThickFrame(4, 0x880088)
            # Add a 4-pixel high/low color scale at x = 29 (left of meter scale)
            m.addColorScale(highLowColorScale, 29, 4)
        else
             # Add a green (0x00bb00) bar from 0 to value with soft lighting effect and 4 pixel
             # rounded corners
            m.addBar(0, value, 0x00bb00, ChartDirector::softLighting(), 4)
            # Add a 4-pixel step color scale at x = 29 (left of meter scale)
            m.addColorScale(stepColorScale, 29, 4)
        end

        # Add a text box at the bottom-center. Display the value using white (0xffffff) 8pt Arial
        # Bold font on a black (0x000000) background with depressed grey (0x333333) rounded border.
        t = m.addText(m.getWidth() / 2, m.getHeight() - 7, m.formatValue(value, "2"), "arialbd.ttf",
            8, 0xffffff, ChartDirector::BottomCenter)
        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/blackvbarmeter.rb
#!/usr/bin/env ruby
require("chartdirector")

def createChart(chartIndex)

    # The value to display on the meter
    value = 66.77

    # Create a LinearMeter object of size 70 x 260 pixels with black background and rounded corners
    m = ChartDirector::LinearMeter.new(70, 260, 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 (36, 30), with size of 20 x 196 pixels. The scale
    # labels are located on the left (default - implies vertical meter).
    m.setMeter(36, 30, 20, 196)

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

    # Add the chart title at the top center
    title = m.addText(m.getWidth() / 2, 5, "Temp C", "arialbd.ttf", 8, ChartDirector::TextColor,
        ChartDirector::TopCenter)

    # Move the scale labels 8 pixels from the meter scale to make room for the color scale
    m.setLabelPos(false, 8)

    # Demostrate different types of color scales
    smoothColorScale = [0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000]
    stepColorScale = [0, 0x00dd00, 50, 0xffff00, 80, 0xff0000, 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::Left), 4)
        # Add a 4-pixel thick smooth color scale at x = 29 (left of meter scale)
        m.addColorScale(smoothColorScale, 29, 4)
    elsif chartIndex == 1
         # Add a yellow (0xCC9922) bar from 0 to value with bar lighting effect
        m.addBar(0, value, 0xcc9922, ChartDirector::barLighting())
        # Add a 4-pixel thick smooth color scale at x = 29 (left of meter scale)
        m.addColorScale(smoothColorScale, 29, 4)

        # Set the title style to black text on a yellow (0xcc9922) background with rounded corners
        title.setFontColor(0x000000)
        title.setBackground(0xcc9922)
        title.setRoundedCorners(2)
    elsif chartIndex == 2
         # Add a grey (0xaaaaaa) bar from 0 to value with bar lighting effect
        m.addBar(0, value, 0xaaaaaa, ChartDirector::barLighting())
        # Add a 4-pixel high/low color scale at x = 29 (left of meter scale)
        m.addColorScale(highLowColorScale, 29, 4)
    elsif chartIndex == 3
         # Add a brown (0xbb6622) bar from 0 to value with cylinder lighting effect
        m.addBar(0, value, 0xbb6622, ChartDirector::cylinderEffect())
        # Add a 4 pixel thick brown (0xbb6622) frame
        m.setThickFrame(4, 0xbb6622)
        # Add a high only color scale at x = 29 (left of meter scale)
        m.addColorScale(highColorScale, 29, 4)
    elsif chartIndex == 4
        # Add a purple (0x7755ee) bar from 0 to value
        m.addBar(0, value, 0x7755ee)
        # Add a 4 pixel thick purple (0x880088) frame
        m.setThickFrame(4, 0x880088)
        # Add a 4-pixel high/low color scale at x = 29 (left of meter scale)
        m.addColorScale(highLowColorScale, 29, 4)
    else
         # Add a green (0x00bb00) bar from 0 to value with soft lighting effect and 4 pixel rounded
         # corners
        m.addBar(0, value, 0x00bb00, ChartDirector::softLighting(), 4)
        # Add a 4-pixel step color scale at x = 29 (left of meter scale)
        m.addColorScale(stepColorScale, 29, 4)
    end

    # Add a text box at the bottom-center. Display the value using white (0xffffff) 8pt Arial Bold
    # font on a black (0x000000) background with depressed grey (0x333333) rounded border.
    t = m.addText(m.getWidth() / 2, m.getHeight() - 7, m.formatValue(value, "2"), "arialbd.ttf", 8,
        0xffffff, ChartDirector::BottomCenter)
    t.setBackground(0x000000, 0x333333, -1)
    t.setRoundedCorners(3)

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

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