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doc:chart_visualization [2014/02/25 16:09] – restructured stefesdoc:chart_visualization [2015/11/25 08:50] (current) – [Visualization in the rowser] admin
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 ====== Chart visualization ====== ====== Chart visualization ======
 +~~NOTOC~~
 +\\
 +^ This page describes the 'catkinized' version of KnowRob that uses the [[http://wiki.ros.org/catkin/|catkin buildsystem]] and the pure Java-based [[http://wiki.ros.org/rosjava|rosjava]]. The older version, which was based on the rosbuild buildsystem and rosjava_jni, used a [[http://wiki.ros.org/mod_vis|local visualization canvas implemented in Java]].^
 +\\
  
-The Chart visualization client listens to a given ROS topic for data_vis_msgs and displays them as a chart. Currently, donut charts and bar charts are supported.+The chart visualization client listens to a given ROS topic for data_vis_msgs and displays them as a chart. Currently, donut charts and bar charts are supported.
  
  
-===== Publishing messages from KnowRob =====+===== Creating charts from KnowRob ===== 
 + 
 +The following predicates start the  publisher that sends updates to the diagram canvas and create a new diagram with the given values. The //add_diagram// predicate is the most generic one that gives full control over all parameters. In contrast, the //add_piechart// and //add_barchart// predicates have fewer parameters and use default values for e.g. the size of the diagrams.
  
   $ rosrun rosprolog rosprolog knowrob_vis   $ rosrun rosprolog rosprolog knowrob_vis
   ?- diagram_canvas.   ?- diagram_canvas.
-  ?- add_diagram(id, title, piechart, xlabel, ylabel, '210', '210', '12px', [[[a,b],['1','2']],[[a,b],['1','2']],[[a,b],['1','2']]]).+   
 +  % Long version: 
 +  ?- add_diagram(diagram_id,  
 +                'Diagram title',  
 +                 piechart,  
 +                'Label for x-axis',  
 +                'Label for y-axis',  
 +                300, 300, '12px',  
 +                [[[a,b,c,d],['21','32','12','45']]]). 
 +   
 +  % Shorter versions: default parameters for piecharts and barcharts 
 +  ?- add_piechart(piechart_id, 'Piechart title', [[[a,b,c,d],['21','32','12','45']]]). 
 +  ?- add_barchart(barchart_id, 'Barchart title', [[[a,b,c,d],['21','32','12','45']]]). 
 + 
 +These three queries will create the following charts: 
 +{{ :doc:diagram-examples.png?nolink |}} 
 + 
 + 
 +===== Behind the scenes: Communication via ROS topics ===== 
 + 
 +The predicates mentioned above publish messages in the following format on the topic //data_vis_msgs//. This topic is forwarded via a websocket by the //rosbridge// server, and a //roslibjs// listener included in the web page receives and visualizes the messages.
  
-This publishes the following message on the topic 'data_vis_msgs':+<code yaml>
   id: id   id: id
   type: 0   type: 0
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       value1: ['a', 'b']       value1: ['a', 'b']
       value2: ['1', '2']       value2: ['1', '2']
-    -  +</code>
-      value1: ['a', 'b'] +
-      value2: ['1', '2']+
  
-Type 0 means donut chart, type 1 bar chart. To update data in an already existing diagram simply publish the message again with the same id and new data in value1 and value2. The chart will update immediately.\\ +Type 0 means donut chart, type 1 is a bar chart. To update data in an already existing diagram, simply publish the message again with the same id and new data in value1 and value2. The chart will update immediately. To remove a chart, publish a message with its id and an empty array for value2. By now, only the first element of the 'values'-array is used (it has been made an array to support other kinds of diagrams in the future, for example multiple timelines).
-To remove a chart, publish a message with its id and an empty array for value2.+
  
-By now, only the first element of the 'values'-array is recognized. 
- 
-===== Publishing messages via rostopic ===== 
 For testing purposes, messages can be published to the topic using the rostopic tool For testing purposes, messages can be published to the topic using the rostopic tool
   $ rostopic pub /data_vis_msgs data_vis_msgs/DataVis '   $ rostopic pub /data_vis_msgs data_vis_msgs/DataVis '
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   '   '
  
-===== Visualization in the Browser =====+===== Visualization in the browser =====
  
-=== Example === 
 This simple web site subscribes to the topic 'data_vis_msgs' and adds diagrams to the div 'chart'. This simple web site subscribes to the topic 'data_vis_msgs' and adds diagrams to the div 'chart'.
 <code html> <code html>
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 </body> </body>
 </code> </code>
 +
 Make sure DonutChart.js, BarChart.js and DataVisClient.js are located in the same directory as the html file and you run Make sure DonutChart.js, BarChart.js and DataVisClient.js are located in the same directory as the html file and you run
   $ roslaunch knowrob_vis knowrob_vis.launch   $ roslaunch knowrob_vis knowrob_vis.launch