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README.rst

Introduction

This is an open source python library to read and write CZML files for Cesium, the WebGL Earth modeling engine.

Requirements

Tests

To run the tests (in the czml directory):

> python setup.py test

czml is continually tested with Travis CI

https://api.travis-ci.org/cleder/czml.png https://coveralls.io/repos/cleder/czml/badge.png?branch=master

Usage and Examples

Reading CZML

Reading a CZML file into a mutable document object can be done by initializing a CZML document and then reading the file's contents into the loads() method on the document, like so:

# Import the library
from czml import czml

# Read an existing CZML file
filename = 'example.czml'
with open(filename, 'r') as example:
    doc = czml.CZML()
    doc.loads(example.read())

Writing CZML

The general approach to writing CZML with this python library is to define a document object, define packets and append them to the document, and then write the document to a file using the write() method:

# Import the library
from czml import czml

# Initialize a document
doc = czml.CZML()

# Create and append the document packet
packet1 = czml.CZMLPacket(id='document',version='1.0')
doc.packets.append(packet1)

# Create and append a billboard packet
packet2 = czml.CZMLPacket(id='billboard')
bb = czml.Billboard(scale=0.7, show=True)
bb.image = 'http://localhost/img.png'
bb.color = {'rgba': [0, 255, 127, 55]}
packet2.billboard = bb
doc.packets.append(packet2)

# Write the CZML document to a file
filename = "example.czml"
doc.write(filename)

Supported CZML Components

The components in this library are developed to follow the CZML Content documentation. Supported components and subcomponents are listed in docs/COMPONENTS.md.

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Read and write CZML in Python

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