ChartDirector Ver 3.0 (Python Edition)

Scatter Chart




This example demonstrates a scatter chart created using XYChart.addScatterLayer, together with a number of chart formatting functions.

Source Code Listing

[File: pythondemo/scatter.py] (The CGI version is available as "pythondemo_cgi/scatter.py".)
#!/usr/bin/python from pychartdir import * #The XY points for the scatter chart dataX0 = [10, 15, 6, 12, 14, 8, 13, 13, 16, 12, 10.5] dataY0 = [130, 150, 80, 110, 110, 105, 130, 115, 170, 125, 125] dataX1 = [6, 12, 4, 3.5, 7, 8, 9, 10, 12, 11, 8] dataY1 = [65, 80, 40, 45, 70, 80, 80, 90, 100, 105, 60] #Create a XYChart object of size 450 x 420 pixels c = XYChart(450, 420) #Set the plotarea at (55, 65) 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, 65, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1) #Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12 #pts Times Bold Italic font. Set the background and border color to Transparent. c.addLegend(50, 30, 0, "timesbi.ttf", 12).setBackground(Transparent) #Add a title to the chart using 18 pts Times Bold Itatic font. c.addTitle("Genetically Modified Predator", "timesbi.ttf", 18) #Add a title to the y axis using 12 pts Arial Bold Italic font c.yAxis().setTitle("Length (cm)", "arialbi.ttf", 12) #Add a title to the x axis using 12 pts Arial Bold Italic font c.xAxis().setTitle("Weight (kg)", "arialbi.ttf", 12) #Set the axes line width to 3 pixels c.xAxis().setWidth(3) c.yAxis().setWidth(3) #Add an orange (0xff9933) scatter chart layer, using 13 pixel diamonds as #symbols c.addScatterLayer(dataX0, dataY0, "Genetically Engineered", DiamondSymbol, 13, 0xff9933) #Add a green (0x33ff33) scatter chart layer, using 11 pixel triangles as symbols c.addScatterLayer(dataX1, dataY1, "Natural", TriangleSymbol, 11, 0x33ff33) #output the chart c.makeChart("scatter.png")