Simple Tree Map

This example demonstrates the basic steps in creating a tree map.

Create a TreeMapChart object using TreeMapChart.TreeMapChart.
Specify the plot area of the chart using TreeMapChart.setPlotArea.
Obtain the root node of the tree map using TreeMapChart,getRootNode and add child nodes to it using TreeMapNode.setData.
Get the child node prototype using TreeMapChart.getLevelPrototype and use it to configure the styles of all the child nodes.
Generate the chart using BaseChart.makeChart.
Generate tool tips for the chart using BaseChart.getHTMLImageMap.

pythondemo\simpletreemap.py

#!/usr/bin/python

# The ChartDirector for Python module is assumed to be in "../lib"
import sys, os
sys.path.insert(0, os.path.join(os.path.abspath(sys.path[0]), "..", "lib"))

from pychartdir import *

# Data for the tree map
data = [25, 18, 15, 12, 8, 30, 35]

# Labels for the tree map
labels = ["Alpha", "Beta", "Gamma", "Delta", "Epsilon", "Zeta", "Eta"]

# Colors for the tree map
colors = [0xff5555, 0xff9933, 0xffff44, 0x66ff66, 0x44ccff, 0x6699ee, 0xdd99dd]

# Create a Tree Map object of size 400 x 400 pixels
c = TreeMapChart(400, 400)

# Set the plotarea at (10, 10) and of size 380 x 380 pixels
c.setPlotArea(10, 10, 380, 380)

# Obtain the root of the tree map, which is the entire plot area
root = c.getRootNode()

# Add first level nodes to the root.
root.setData(data, labels, colors)

# Get the prototype (template) for the first level nodes.
nodeConfig = c.getLevelPrototype(1)

# Set the label format for the nodes to show the label and value with 8pt Arial Bold font in black
# color (000000) and center aligned in the node.
nodeConfig.setLabelFormat("{label}<*br*>{value}", "Arial Bold", 8, 0x000000, Center)

# Set the node fill color to the provided color and the border color to white (ffffff)
nodeConfig.setColors(-1, 0xffffff)

# Output the chart
c.makeChart("simpletreemap.png")