Depth Bar Chart

This example demonstrates using multiple bar layers with semi-transparent colors to create a depth bar chart.

ChartDirector allows an XYChart to containing multiple layers of the same or different types. In this example, all layers are 3D bar layers. The bars are drawn in semi-transparent colors to avoid the bars on the front hiding the bars at the back.

pythondemo\depthbar.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 *

# The data for the bar chart
data0 = [100, 125, 245, 147, 67]
data1 = [85, 156, 179, 211, 123]
data2 = [97, 87, 56, 267, 157]

# The labels for the bar chart
labels = ["Mon", "Tue", "Wed", "Thu", "Fri"]

# Create a XYChart object of size 500 x 320 pixels
c = XYChart(500, 320)

# Set the plotarea at (100, 40) and of size 280 x 240 pixels
c.setPlotArea(100, 40, 280, 240)

# Add a legend box at (405, 100)
c.addLegend(405, 100)

# Add a title to the chart
c.addTitle("Weekday Network Load")

# Add a title to the y axis. Draw the title upright (font angle = 0)
c.yAxis().setTitle("Average\nWorkload\n(MBytes\nPer Hour)").setFontAngle(0)

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

# Add three bar layers, each representing one data set. The bars are drawn in semi-transparent
# colors.
c.addBarLayer(data0, 0x808080ff, "Server # 1", 5)
c.addBarLayer(data1, 0x80ff0000, "Server # 2", 5)
c.addBarLayer(data2, 0x8000ff00, "Server # 3", 5)

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