ChartDirector Ver 3.0 (Python Edition)

Enhanced Area Chart




This example extends the Simple Area Chart example by decorating the chart using a number of chart formatting features.

Source Code Listing

[File: pythondemo/enhancedarea.py] (The CGI version is available as "pythondemo_cgi/enhancedarea.py".)
#!/usr/bin/python from pychartdir import * #The data for the area chart data = [30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 89, 60, 55, 53, 35, 50, 66, 56, 48, 52, 65, 62] #The labels for the area chart labels = ["0", "", "", "3", "", "", "6", "", "", "9", "", "", "12", "", "", "15", "", "", "18", "", "", "21", "", "", "24"] #Create a XYChart object of size 500 x 300 pixels, using 0xf0e090 as 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, with white #background. Set border and grid line colors to 0xa08040. c.setPlotArea(55, 50, 420, 205, 0xffffff, -1, 0xa08040, 0xa08040, 0xa08040) #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 CDML 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 an area layer to the chart using a semi-transparent gradient color c.addAreaLayer(data, c.gradientColor(0, 50, 0, 255, 0x40ff8000, 0x40ffffff)) #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("enhancedarea.png")