[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.
./bazel-bin/common/proto/call_python_client_cli

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

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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.