ChartDirector 6.0 (Ruby Edition)
Semicircle Meter with Readout
Source Code Listing
require("chartdirector") class SemicirclemeterreadoutController < ApplicationController def index() @title = "Semicircle Meter with Readout" @ctrl_file = File.expand_path(__FILE__) @noOfCharts = 2 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 # The background and border colors of the meters bgColor = [0x88ccff, 0xffdddd] borderColor = [0x000077, 0x880000] # Create an AngularMeter object of size 300 x 200 pixels with transparent background m = ChartDirector::AngularMeter.new(300, 200, ChartDirector::Transparent) # Center at (150, 150), scale radius = 124 pixels, scale angle -90 to +90 degrees m.setMeter(150, 150, 124, -90, 90) # Background gradient color with brighter color at the center bgGradient = [0, m.adjustBrightness(bgColor[chartIndex], 3), 0.75, bgColor[chartIndex]] # Add a scale background of 148 pixels radius using the background gradient, with a 13 pixel # thick border m.addScaleBackground(148, m.relativeRadialGradient(bgGradient), 13, borderColor[chartIndex]) # Meter scale is 0 - 100, with major tick every 20 units, minor tick every 10 units, and # micro tick every 5 units m.setScale(0, 100, 20, 10, 5) # Set the scale label style to 15pt Arial Italic. Set the major/minor/micro tick lengths to # 16/16/10 pixels pointing inwards, and their widths to 2/1/1 pixels. m.setLabelStyle("ariali.ttf", 16) m.setTickLength(-16, -16, -10) m.setLineWidth(0, 2, 1, 1) # Demostrate different types of color scales and putting them at different positions smoothColorScale = [0, 0x3333ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000] if chartIndex == 0 # Add the smooth color scale at the default position m.addColorScale(smoothColorScale) # Add a red (0xff0000) triangular pointer starting from 38% and ending at 60% of scale # radius, with a width 6 times the default m.addPointer2(value, 0xff0000, -1, ChartDirector::TriangularPointer2, 0.38, 0.6, 6) else # Add the smooth color scale starting at radius 124 with zero width and ending at radius # 124 with 16 pixels inner width m.addColorScale(smoothColorScale, 124, 0, 124, -16) # Add a red (0xff0000) pointer m.addPointer2(value, 0xff0000) end # Configure a large "pointer cap" to be used as the readout circle at the center. The cap # radius and border width is set to 33% and 4% of the meter scale radius. The cap color is # dark blue (0x000044). The border color is light blue (0x66bbff) with a 60% brightness # gradient effect. m.setCap2(ChartDirector::Transparent, 0x000044, 0x66bbff, 0.6, 0, 0.33, 0.04) # Add value label at the center with light blue (0x66ddff) 28pt Arial Italic font m.addText(150, 150, m.formatValue(value, "{value|0}"), "ariali.ttf", 28, 0x66ddff, ChartDirector::Center).setMargin(0) # Output the chart send_data(m.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline") end end |
<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> |
#!/usr/bin/env ruby require("chartdirector") def createChart(chartIndex) # The value to display on the meter value = 66 # The background and border colors of the meters bgColor = [0x88ccff, 0xffdddd] borderColor = [0x000077, 0x880000] # Create an AngularMeter object of size 300 x 200 pixels with transparent background m = ChartDirector::AngularMeter.new(300, 200, ChartDirector::Transparent) # Center at (150, 150), scale radius = 124 pixels, scale angle -90 to +90 degrees m.setMeter(150, 150, 124, -90, 90) # Background gradient color with brighter color at the center bgGradient = [0, m.adjustBrightness(bgColor[chartIndex], 3), 0.75, bgColor[chartIndex]] # Add a scale background of 148 pixels radius using the background gradient, with a 13 pixel # thick border m.addScaleBackground(148, m.relativeRadialGradient(bgGradient), 13, borderColor[chartIndex]) # Meter scale is 0 - 100, with major tick every 20 units, minor tick every 10 units, and micro # tick every 5 units m.setScale(0, 100, 20, 10, 5) # Set the scale label style to 15pt Arial Italic. Set the major/minor/micro tick lengths to # 16/16/10 pixels pointing inwards, and their widths to 2/1/1 pixels. m.setLabelStyle("ariali.ttf", 16) m.setTickLength(-16, -16, -10) m.setLineWidth(0, 2, 1, 1) # Demostrate different types of color scales and putting them at different positions smoothColorScale = [0, 0x3333ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000] if chartIndex == 0 # Add the smooth color scale at the default position m.addColorScale(smoothColorScale) # Add a red (0xff0000) triangular pointer starting from 38% and ending at 60% of scale # radius, with a width 6 times the default m.addPointer2(value, 0xff0000, -1, ChartDirector::TriangularPointer2, 0.38, 0.6, 6) else # Add the smooth color scale starting at radius 124 with zero width and ending at radius 124 # with 16 pixels inner width m.addColorScale(smoothColorScale, 124, 0, 124, -16) # Add a red (0xff0000) pointer m.addPointer2(value, 0xff0000) end # Configure a large "pointer cap" to be used as the readout circle at the center. The cap radius # and border width is set to 33% and 4% of the meter scale radius. The cap color is dark blue # (0x000044). The border color is light blue (0x66bbff) with a 60% brightness gradient effect. m.setCap2(ChartDirector::Transparent, 0x000044, 0x66bbff, 0.6, 0, 0.33, 0.04) # Add value label at the center with light blue (0x66ddff) 28pt Arial Italic font m.addText(150, 150, m.formatValue(value, "{value|0}"), "ariali.ttf", 28, 0x66ddff, ChartDirector::Center).setMargin(0) # Output the chart m.makeChart("semicirclemeterreadout%s.png" % chartIndex) end createChart(0) createChart(1) |