How to change Font at TextNode which have arranged on the diagramme.
How to appoint keys Ctrl + '+' and Ctrl + '-' for scaling diagramm.
You can use FontStyle property of the TextNode and you can change the font at run time. Please refer to the below code snippet.
For scaling the diagram, you have to derive the ZoomTool and override the ProcessMouseUp() method. To catch the Ctrl + '+' and Ctrl+ '-' key, you have to override ProcessCmdKey() method. Please refer to the below code snippet.
Thanks for the answer. And if I create TextNode in separate class TextField. How to address to it for font change.
You can derive a TextNode in a separate class and you can set the font to that TextNode. Please refer to the below code snippet.