require("chartdirector")
class ContourinterpolateController < ApplicationController
def index()
@title = "Contour Interpolation"
@ctrl_file = File.expand_path(__FILE__)
@noOfCharts = 4
render :template => "templates/chartview"
end
#
# Render and deliver the chart
#
def getchart()
# The x and y coordinates of the grid
dataX = [-4, -3, -2, -1, 0, 1, 2, 3, 4]
dataY = [-4, -3, -2, -1, 0, 1, 2, 3, 4]
# The values at the grid points. In this example, we will compute the values using
# the formula z = Sin(x * pi / 3) * Sin(y * pi / 3).
dataZ = Array.new((dataX.length) * (dataY.length))
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] = Math.sin(x * 3.1416 / 3
) * Math.sin(y * 3.1416 / 3)
end
end
# Create a XYChart object of size 360 x 360 pixels
c = ChartDirector::XYChart.new(360, 360)
# Set the plotarea at (30, 25) and of size 300 x 300 pixels. Use semi-transparent
# black (c0000000) for both horizontal and vertical grid lines
c.setPlotArea(30, 25, 300, 300, -1, -1, -1, 0xc0000000, -1)
# Add a contour layer using the given data
layer = c.addContourLayer(dataX, dataY, dataZ)
# Set the x-axis and y-axis scale
c.xAxis().setLinearScale(-4, 4, 1)
c.yAxis().setLinearScale(-4, 4, 1)
if params["img"] == "0"
# Discrete coloring, spline surface interpolation
c.addTitle("Spline Surface - Discrete Coloring", "arialbi.ttf", 12)
elsif params["img"] == "1"
# Discrete coloring, linear surface interpolation
c.addTitle("Linear Surface - Discrete Coloring", "arialbi.ttf", 12)
layer.setSmoothInterpolation(false)
elsif params["img"] == "2"
# Smooth coloring, spline surface interpolation
c.addTitle("Spline Surface - Continuous Coloring", "arialbi.ttf", 12)
layer.setContourColor(ChartDirector::Transparent)
layer.colorAxis().setColorGradient(true)
else
# Discrete coloring, linear surface interpolation
c.addTitle("Linear Surface - Continuous Coloring", "arialbi.ttf", 12)
layer.setSmoothInterpolation(false)
layer.setContourColor(ChartDirector::Transparent)
layer.colorAxis().setColorGradient(true)
end
# Output the chart
send_data(c.makeChart2(ChartDirector::JPG), :type => "image/jpeg",
:disposition => "inline")
end
end |