ChartDirector Ver 3.0 (Python Edition)

Spline Line Chart




This example demonstrates using spline curves to join data points, as well as a number of advanced chart formatting techniques.

Source Code Listing

[File: pythondemo/splineline.py] (The CGI version is available as "pythondemo_cgi/splineline.py".)
#!/usr/bin/python from pychartdir import * #The data for the chart data0 = [32, 39, 23, 28, 41, 36] data1 = [50, 55, 47, 34, 47, 56] #The labels for the chart labels = ["0", "1", "2", "3", "4", "5"] #Create a XYChart object of size 500 x 300 pixels, using 0xf0e090 as the #background color, with a black border, and 1 pixel 3D border effect. c = XYChart(500, 300, 0xf0e090, 0x0, 1) #Set the plotarea at (55, 50) and of size 420 x 205 pixels, using 0xfff0c0 as #the plot area background color, and 0xa08040 as the grid and border colors. #Turn on both horizontal and vertical grid lines with light grey color #(0xc0c0c0) c.setPlotArea(55, 50, 420, 205, 0xfff0c0, -1, 0xa08040, 0xa08040, 0xa08040) #Add a legend box at (55, 25) (top of the chart) with horizontal layout. Use 8 #pts Arial font. Set the background and border color to Transparent. c.addLegend(55, 25, 0, "", 8).setBackground(Transparent) #Add a title box to the chart using 13 pts Arial Bold Italic font. The title is #in CDML and includes embedded images for highlight. The text is white #(0xffffff) on a brown (0x807040) background, with a 1 pixel 3D border. c.addTitle( "<*block,valign=absmiddle*><*img=star.png*><*img=star.png*> Performance " \ "Enhancer <*img=star.png*><*img=star.png*><*/*>", "arialbi.ttf", 13, 0xffffff).setBackground(0x807040, -1, 1) #Add a title to the y axis c.yAxis().setTitle("Energy Concentration (KJ per liter)") #Set the labels on the x axis c.xAxis().setLabels(labels) #Add a title to the x axis using CMDL c.xAxis().setTitle( "<*block,valign=absmiddle*><*img=clock.png*> Elapsed Time (hour)<*/*>") #Set the axes width to 2 pixels c.xAxis().setWidth(2) c.yAxis().setWidth(2) #Add a spline layer to the chart layer = c.addSplineLayer() #Set the default line width to 2 pixels layer.setLineWidth(2) #Add a data set to the spline layer, using blue (0xc0) as the line color, with #yellow (0xffff00) circle symbols. layer.addDataSet(data1, 0xc0, "Target Group").setDataSymbol(CircleSymbol, 9, 0xffff00) #Add a data set to the spline layer, using brown (0x982810) as the line color, #with pink (0xf040f0) diamond symbols. layer.addDataSet(data0, 0x982810, "Control Group").setDataSymbol(DiamondSymbol, 9, 0xf040f0) #Add a custom CDML text at the bottom right of the plot area as the logo c.addText(475, 255, "<*block,valign=absmiddle*><*img=small_molecule.png*> <*block*>" \ "<*font=timesbi.ttf,size=10,color=804040*>Molecular\nEngineering<*/*>" ).setAlignment(BottomRight) #output the chart c.makeChart("splineline.png")