ChartDirector Ver 5.0 (Python Edition)

Custom Scatter Labels




This example demonstrates adding custom labels to data points.

Source Code Listing

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

# The XY points for the scatter chart
dataX = [150, 400, 300, 1500, 800]
dataY = [0.6, 8, 5.4, 2, 4]

# The labels for the points
labels = ["Nano\n100", "SpeedTron\n200 Lite", "SpeedTron\n200", "Marathon\nExtra",
    "Marathon\n2000"]

# Create a XYChart object of size 450 x 400 pixels
c = XYChart(450, 400)

# Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border
# (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
# (0xc0c0c0)
c.setPlotArea(55, 40, 350, 300, '0xffffff', -1, '0xc0c0c0', '0xc0c0c0', -1)

# Add a title to the chart using 18 pts Times Bold Itatic font.
c.addTitle("Product Comparison Chart", "timesbi.ttf", 18)

# Add a title to the y axis using 12 pts Arial Bold Italic font
c.yAxis().setTitle("Capacity (tons)", "arialbi.ttf", 12)

# Add a title to the x axis using 12 pts Arial Bold Italic font
c.xAxis().setTitle("Range (miles)", "arialbi.ttf", 12)

# Set the axes line width to 3 pixels
c.xAxis().setWidth(3)
c.yAxis().setWidth(3)

# Add the data as a scatter chart layer, using a 15 pixel circle as the symbol
layer = c.addScatterLayer(dataX, dataY, "", GlassSphereShape, 15, '0xff3333',
    '0xff3333')

# Add labels to the chart as an extra field
layer.addExtraField(labels)

# Set the data label format to display the extra field
layer.setDataLabelFormat("{field0}")

# Use 8pts Arial Bold to display the labels
textbox = layer.setDataLabelStyle("arialbd.ttf", 8)

# Set the background to purple with a 1 pixel 3D border
textbox.setBackground('0xcc99ff', Transparent, 1)

# Put the text box 4 pixels to the right of the data point
textbox.setAlignment(Left)
textbox.setPos(4, 0)

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

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

# The XY points for the scatter chart
dataX = [150, 400, 300, 1500, 800]
dataY = [0.6, 8, 5.4, 2, 4]

# The labels for the points
labels = ["Nano\n100", "SpeedTron\n200 Lite", "SpeedTron\n200", "Marathon\nExtra",
    "Marathon\n2000"]

# Create a XYChart object of size 450 x 400 pixels
c = XYChart(450, 400)

# Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border
# (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
# (0xc0c0c0)
c.setPlotArea(55, 40, 350, 300, '0xffffff', -1, '0xc0c0c0', '0xc0c0c0', -1)

# Add a title to the chart using 18 pts Times Bold Itatic font.
c.addTitle("Product Comparison Chart", "timesbi.ttf", 18)

# Add a title to the y axis using 12 pts Arial Bold Italic font
c.yAxis().setTitle("Capacity (tons)", "arialbi.ttf", 12)

# Add a title to the x axis using 12 pts Arial Bold Italic font
c.xAxis().setTitle("Range (miles)", "arialbi.ttf", 12)

# Set the axes line width to 3 pixels
c.xAxis().setWidth(3)
c.yAxis().setWidth(3)

# Add the data as a scatter chart layer, using a 15 pixel circle as the symbol
layer = c.addScatterLayer(dataX, dataY, "", GlassSphereShape, 15, '0xff3333',
    '0xff3333')

# Add labels to the chart as an extra field
layer.addExtraField(labels)

# Set the data label format to display the extra field
layer.setDataLabelFormat("{field0}")

# Use 8pts Arial Bold to display the labels
textbox = layer.setDataLabelStyle("arialbd.ttf", 8)

# Set the background to purple with a 1 pixel 3D border
textbox.setBackground('0xcc99ff', Transparent, 1)

# Put the text box 4 pixels to the right of the data point
textbox.setAlignment(Left)
textbox.setPos(4, 0)

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