[WIP] Visualize data

Drake could call python functions. So we could use matplotlib in python to create data plots.

This piece of tool is used for translating the function call in C++ into python and transmit some data format as well. We need to run the call_python_client_cli to enable this feature.

cd drake
bazel build //common/proto:call_python_client_cli //common/proto:call_python_server_test
# Create default pipe file.
rm -f /tmp/python_rpc && mkfifo /tmp/python_rpc
# Run the translation software.

So in our code, we could use this service and call plot in python to draw figures.

So we could see the tool receive the python function call request and data passed with this request. A figure pop up after the plot command. This is how we plot data in Drake.

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