ChartDirector Ver 3.0 (Python Edition)

Custom Scatter Symbols




This example demonstrates using external image files as scatter symbols.

The chart in this example is created as 5 scatter layers using XYChart.addScatterLayer, with each layer containing one point.

The symbols for the scatter layers come from external image files. They are loaded using DataSet.setDataSymbol2.

Source Code Listing

[File: pythondemo/scattersymbols.py] (The CGI version is available as "pythondemo_cgi/scattersymbols.py".)
#!/usr/bin/python from pychartdir import * #The XY points for the scatter chart dataX = [200, 400, 300, 250, 500] dataY = [40, 100, 50, 150, 250] #The custom symbols for the points symbols = ["robot1.png", "robot2.png", "robot3.png", "robot4.png", "robot5.png"] #Create a XYChart object of size 450 x 400 pixels c = XYChart(450, 400) #Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey #border (0xc0c0c0). Turn on both horizontal and vertical grid lines with light #grey color (0xc0c0c0) c.setPlotArea(55, 40, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1) #Add a title to the chart using 18 pts Times Bold Itatic font. c.addTitle("Battle Robots", "timesbi.ttf", 18) #Add a title to the y axis using 12 pts Arial Bold Italic font c.yAxis().setTitle("Speed (km/s)", "arialbi.ttf", 12) #Add a title to the y axis using 12 pts Arial Bold Italic font c.xAxis().setTitle("Range (km)", "arialbi.ttf", 12) #Set the axes line width to 3 pixels c.xAxis().setWidth(3) c.yAxis().setWidth(3) #Add each point of the data as a separate scatter layer, so that they can have a #different symbol for i in range(0, len(dataX)) : c.addScatterLayer([dataX[i]], [dataY[i]]).getDataSet(0).setDataSymbol( symbols[i]) #output the chart c.makeChart("scattersymbols.png")