ChartDirector Ver 3.0 (Python Edition)

Scatter Trend Chart




The chart in this example composed of four layers - 2 scatter layers created using XYChart.addScatterLayer, and two trend line layer created using XYChart.addTrendLayer2.

Source Code Listing

[File: pythondemo/scattertrend.py] (The CGI version is available as "pythondemo_cgi/scattertrend.py".)
#!/usr/bin/python from pychartdir import * #The XY data of the first data series dataX0 = [50, 55, 37, 24, 42, 49, 63, 72, 83, 59] dataY0 = [3.6, 2.8, 2.5, 2.3, 3.8, 3.0, 3.8, 5.0, 6.0, 3.3] #The XY data of the second data series dataX1 = [50, 55, 37, 24, 42, 49, 63, 72, 83, 59] dataY1 = [1.6, 1.8, 0.8, 0.5, 1.3, 1.5, 2.3, 2.4, 2.9, 1.5] #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 white #background and a light grey border (0xc0c0c0). Turn on both horizontal and #vertical grid lines with light grey color (0xc0c0c0) c.setPlotArea(55, 65, 350, 300, 0xffffff, -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 point Times Bold Itatic font. c.addTitle("Server Performance", "timesbi.ttf", 18) #Add a title to the y axis using 12 pts Arial Bold Italic font c.yAxis().setTitle("Response Time (sec)", "arialbi.ttf", 12) #Set the y axis line width to 3 pixels c.yAxis().setWidth(3) #Set the y axis label format to show 1 decimal point c.yAxis().setLabelFormat("{value|1}") #Add a title to the x axis using 12 pts Arial Bold Italic font c.xAxis().setTitle("Server Load (TPS)", "arialbi.ttf", 12) #Set the x axis line width to 3 pixels c.xAxis().setWidth(3) #Add a scatter layer using (dataX0, dataY0) c.addScatterLayer(dataX0, dataY0, "Server AAA", DiamondSymbol, 11, 0x8000) #Add a trend line layer for (dataX0, dataY0) c.addTrendLayer2(dataX0, dataY0, 0x8000).setLineWidth(3) #Add a scatter layer for (dataX1, dataY1) c.addScatterLayer(dataX1, dataY1, "Server BBB", TriangleSymbol, 9, 0x6666ff) #Add a trend line layer for (dataX1, dataY1) c.addTrendLayer2(dataX1, dataY1, 0x6666ff).setLineWidth(3) #output the chart c.makeChart("scattertrend.png")