| #!/usr/bin/python2.4 |
| # |
| # Copyright 2008 Google Inc. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| """Backend which can generate charts using the Google Chart API.""" |
| |
| from graphy import line_chart |
| from graphy import bar_chart |
| from graphy import pie_chart |
| from graphy.backends.google_chart_api import encoders |
| |
| def _GetChartFactory(chart_class, display_class): |
| """Create a factory method for instantiating charts with displays. |
| |
| Returns a method which, when called, will create & return a chart with |
| chart.display already populated. |
| """ |
| def Inner(*args, **kwargs): |
| chart = chart_class(*args, **kwargs) |
| chart.display = display_class(chart) |
| return chart |
| return Inner |
| |
| # These helper methods make it easy to get chart objects with display |
| # objects already setup. For example, this: |
| # chart = google_chart_api.LineChart() |
| # is equivalent to: |
| # chart = line_chart.LineChart() |
| # chart.display = google_chart_api.encoders.LineChartEncoder(chart) |
| # |
| # (If there's some chart type for which a helper method isn't available, you |
| # can always just instantiate the correct encoder manually, like in the 2nd |
| # example above). |
| # TODO: fix these so they have nice docs in ipython (give them __doc__) |
| LineChart = _GetChartFactory(line_chart.LineChart, encoders.LineChartEncoder) |
| Sparkline = _GetChartFactory(line_chart.Sparkline, encoders.SparklineEncoder) |
| BarChart = _GetChartFactory(bar_chart.BarChart, encoders.BarChartEncoder) |
| PieChart = _GetChartFactory(pie_chart.PieChart, encoders.PieChartEncoder) |