ChartDirector Ver 3.0 (Python Edition)

Pattern Area Chart




This example demostrates using a pattern for filling the area in an area chart, together with a number of chart formatting features.

Source Code Listing

[File: pythondemo/patternarea.py] (The CGI version is available as "pythondemo_cgi/patternarea.py".)
#!/usr/bin/python from pychartdir import * #The data for the area chart data = [3.0, 2.8, 4.0, 5.5, 7.5, 6.8, 5.4, 6.0, 5.0, 6.2, 7.5, 6.5, 7.5, 8.1, 6.0, 5.5, 5.3, 3.5, 5.0, 6.6, 5.6, 4.8, 5.2, 6.5, 6.2] #The labels for the area chart labels = ["0", "", "", "3", "", "", "6", "", "", "9", "", "", "12", "", "", "15", "", "", "18", "", "", "21", "", "", "24"] #Create a XYChart object of size 300 x 180 pixels. Set the background to pale #yellow (0xffffa0) with a black border (0x0) c = XYChart(300, 180, 0xffffa0, 0x0) #Set the plotarea at (45, 35) and of size 240 x 120 pixels. Set the background #to white (0xffffff). Set both horizontal and vertical grid lines to black #(&H0&) dotted lines (pattern code 0x0103) c.setPlotArea(45, 35, 240, 120, 0xffffff, -1, -1, c.dashLineColor(0x0, 0x103), c.dashLineColor(0x0, 0x103)) #Add a title to the chart using 10 pts Arial Bold font. Use a 1 x 2 bitmap #pattern as the background. Set the border to black (0x0). c.addTitle("Snow Percipitation (Dec 12)", "arialbd.ttf", 10).setBackground( c.patternColor([0xb0b0f0, 0xe0e0ff], 2), 0x0) #Add a title to the y axis c.yAxis().setTitle("mm per hour") #Set the x axis labels using the given labels c.xAxis().setLabels(labels) #Add an area layer to the chart layer = c.addAreaLayer() #Load a snow pattern from an external file "snow.png". snowPattern = c.patternColor("snow.png") #Add a data set to the area layer using the snow pattern as the fill color. Use #deep blue (0x0000ff) as the area border line color (&H0000ff&) layer.addDataSet(data).setDataColor(snowPattern, 0xff) #Set the line width to 2 pixels to highlight the line layer.setLineWidth(2) #output the chart c.makeChart("patternarea.png")