While Chapter 5 was meant to give a quick introduction to the creation of a GUI in Rack, using ready-made widgets and allowing the reader to move quickly to the development of the first plugins, this chapter discusses the development of new widgets. We start by introducing the rendering library, NanoVG, used to draw user-defined lines and shapes and to render SVG files, then we suggest how to customize available classes to get custom knobs and text labels. At the end of the chapter, we propose a variation of the Modal Synthesis plugin that adds an interactive GUI element for sound generation.

9.1 The Rendering Library: NanoVG

The rendering library used in VCV Rack is a third-party ...

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