ChartDirector Ver 4.1 (Python Edition)

Custom Symbols




This example demonstrates loading external image files as data symbols by using DataSet.setDataSymbol2.

Source Code Listing

[Standalone Version] pythondemo\customsymbolline.py
#!/usr/bin/python
from pychartdir import *

# The data for the chart
data0 = [600, 800, 1200, 1500, 1800, 1900, 2000, 1950]
data1 = [300, 450, 500, 1000, 1500, 1600, 1650, 1600]

# The labels for the chart
labels = ["1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002"]

# Create a XYChart object of size 450 x 250 pixels, with a pale yellow (0xffffc0)
# background, a black border, and 1 pixel 3D border effect.
c = XYChart(450, 250, 0xffffc0, 0, 1)

# Set the plotarea at (60, 45) and of size 360 x 170 pixels, using white (0xffffff)
# as the plot area background color. Turn on both horizontal and vertical grid lines
# with light grey color (0xc0c0c0)
c.setPlotArea(60, 45, 360, 170, 0xffffff, -1, -1, 0xc0c0c0, -1)

# Add a legend box at (60, 20) (top of the chart) with horizontal layout. Use 8 pts
# Arial Bold font. Set the background and border color to Transparent.
c.addLegend(60, 20, 0, "arialbd.ttf", 8).setBackground(Transparent)

# Add a title to the chart using 12 pts Arial Bold/white font. Use a 1 x 2 bitmap
# pattern as the background.
c.addTitle("Information Resource Usage", "arialbd.ttf", 12, 0xffffff).setBackground(
    c.patternColor([0x000040, 0x000080], 2))

# Set the labels on the x axis
c.xAxis().setLabels(labels)

# Reserve 8 pixels margins at both side of the x axis to avoid the first and last
# symbols drawing outside of the plot area
c.xAxis().setMargin(8, 8)

# Add a title to the y axis
c.yAxis().setTitle("Population")

# Add a line layer to the chart
layer = c.addLineLayer2()

# Add the first line using small_user.png as the symbol.
layer.addDataSet(data0, 0xcf4040, "Users").setDataSymbol2("small_user.png")

# Add the first line using small_computer.png as the symbol.
layer.addDataSet(data1, 0x40cf40, "Computers").setDataSymbol2("small_computer.png")

# Set the line width to 3 pixels
layer.setLineWidth(3)

# output the chart
c.makeChart("customsymbolline.png")

[CGI Version] pythondemo_cgi\customsymbolline.py
#!/usr/bin/python
from pychartdir import *
import os

# The data for the chart
data0 = [600, 800, 1200, 1500, 1800, 1900, 2000, 1950]
data1 = [300, 450, 500, 1000, 1500, 1600, 1650, 1600]

# The labels for the chart
labels = ["1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002"]

# Create a XYChart object of size 450 x 250 pixels, with a pale yellow (0xffffc0)
# background, a black border, and 1 pixel 3D border effect.
c = XYChart(450, 250, 0xffffc0, 0, 1)

# Set the plotarea at (60, 45) and of size 360 x 170 pixels, using white (0xffffff)
# as the plot area background color. Turn on both horizontal and vertical grid lines
# with light grey color (0xc0c0c0)
c.setPlotArea(60, 45, 360, 170, 0xffffff, -1, -1, 0xc0c0c0, -1)

# Add a legend box at (60, 20) (top of the chart) with horizontal layout. Use 8 pts
# Arial Bold font. Set the background and border color to Transparent.
c.addLegend(60, 20, 0, "arialbd.ttf", 8).setBackground(Transparent)

# Add a title to the chart using 12 pts Arial Bold/white font. Use a 1 x 2 bitmap
# pattern as the background.
c.addTitle("Information Resource Usage", "arialbd.ttf", 12, 0xffffff).setBackground(
    c.patternColor([0x000040, 0x000080], 2))

# Set the labels on the x axis
c.xAxis().setLabels(labels)

# Reserve 8 pixels margins at both side of the x axis to avoid the first and last
# symbols drawing outside of the plot area
c.xAxis().setMargin(8, 8)

# Add a title to the y axis
c.yAxis().setTitle("Population")

# Add a line layer to the chart
layer = c.addLineLayer2()

# Add the first line using small_user.png as the symbol.
layer.addDataSet(data0, 0xcf4040, "Users").setDataSymbol2(os.path.join(
    os.path.dirname(sys.argv[0]), "small_user.png"))

# Add the first line using small_computer.png as the symbol.
layer.addDataSet(data1, 0x40cf40, "Computers").setDataSymbol2(os.path.join(
    os.path.dirname(sys.argv[0]), "small_computer.png"))

# Set the line width to 3 pixels
layer.setLineWidth(3)

# output the chart
print "Content-type: image/png\n"
binaryPrint(c.makeChart2(PNG))