ChartDirector 6.0 (Ruby Edition)

Surface Shading


      

This example demonstrates the effects of various surface shading methods, configured using SurfaceChart.setShadingMode.

Source Code Listing

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

class SurfaceshadingController < ApplicationController

    def index()
        @title = "Surface Shading"
        @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 x and y coordinates of the grid
        dataX = [-10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10]
        dataY = [-10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10]

        # The values at the grid points. In this example, we will compute the values using the
        # formula z = x * sin(y) + y * sin(x).
        dataZ = Array.new(dataX.length * dataY.length, 0)
        0.upto(dataY.length - 1) do |yIndex|
            y = dataY[yIndex]
            0.upto(dataX.length - 1) do |xIndex|
                x = dataX[xIndex]
                dataZ[yIndex * dataX.length + xIndex] = x * Math.sin(y) + y * Math.sin(x)
            end
        end

        # Create a SurfaceChart object of size 380 x 400 pixels, with white (ffffff) background and
        # grey (888888) border.
        c = ChartDirector::SurfaceChart.new(380, 400, 0xffffff, 0x888888)

        # Demonstrate various shading methods
        if chartIndex == 0
            c.addTitle("11 x 11 Data Points\nSmooth Shading")
        elsif chartIndex == 1
            c.addTitle("11 x 11 Points - Spline Fitted to 50 x 50\nSmooth Shading")
            c.setInterpolation(50, 50)
        elsif chartIndex == 2
            c.addTitle("11 x 11 Data Points\nRectangular Shading")
            c.setShadingMode(ChartDirector::RectangularShading)
        else
            c.addTitle("11 x 11 Data Points\nTriangular Shading")
            c.setShadingMode(ChartDirector::TriangularShading)
        end

        # Set the center of the plot region at (175, 200), and set width x depth x height to 200 x
        # 200 x 160 pixels
        c.setPlotRegion(175, 200, 200, 200, 160)

        # Set the plot region wall thichness to 5 pixels
        c.setWallThickness(5)

        # Set the elevation and rotation angles to 45 and 60 degrees
        c.setViewAngle(45, 60)

        # Set the perspective level to 35
        c.setPerspective(35)

        # Set the data to use to plot the chart
        c.setData(dataX, dataY, dataZ)

        # Set contour lines to semi-transparent black (c0000000)
        c.setContourColor(0xc0000000)

        # Output the chart
        send_data(c.makeChart2(ChartDirector::JPG), :type => "image/jpeg", :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/surfaceshading.rb
#!/usr/bin/env ruby
require("chartdirector")

def createChart(chartIndex)

    # The x and y coordinates of the grid
    dataX = [-10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10]
    dataY = [-10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10]

    # The values at the grid points. In this example, we will compute the values using the formula z
    # = x * sin(y) + y * sin(x).
    dataZ = Array.new(dataX.length * dataY.length, 0)
    0.upto(dataY.length - 1) do |yIndex|
        y = dataY[yIndex]
        0.upto(dataX.length - 1) do |xIndex|
            x = dataX[xIndex]
            dataZ[yIndex * dataX.length + xIndex] = x * Math.sin(y) + y * Math.sin(x)
        end
    end

    # Create a SurfaceChart object of size 380 x 400 pixels, with white (ffffff) background and grey
    # (888888) border.
    c = ChartDirector::SurfaceChart.new(380, 400, 0xffffff, 0x888888)

    # Demonstrate various shading methods
    if chartIndex == 0
        c.addTitle("11 x 11 Data Points\nSmooth Shading")
    elsif chartIndex == 1
        c.addTitle("11 x 11 Points - Spline Fitted to 50 x 50\nSmooth Shading")
        c.setInterpolation(50, 50)
    elsif chartIndex == 2
        c.addTitle("11 x 11 Data Points\nRectangular Shading")
        c.setShadingMode(ChartDirector::RectangularShading)
    else
        c.addTitle("11 x 11 Data Points\nTriangular Shading")
        c.setShadingMode(ChartDirector::TriangularShading)
    end

    # Set the center of the plot region at (175, 200), and set width x depth x height to 200 x 200 x
    # 160 pixels
    c.setPlotRegion(175, 200, 200, 200, 160)

    # Set the plot region wall thichness to 5 pixels
    c.setWallThickness(5)

    # Set the elevation and rotation angles to 45 and 60 degrees
    c.setViewAngle(45, 60)

    # Set the perspective level to 35
    c.setPerspective(35)

    # Set the data to use to plot the chart
    c.setData(dataX, dataY, dataZ)

    # Set contour lines to semi-transparent black (c0000000)
    c.setContourColor(0xc0000000)

    # Output the chart
    c.makeChart("surfaceshading%s.jpg" % chartIndex)
end

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