# Onscreen Fundamentals

The KFract Handbook
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# Chapter 2. Onscreen Fundamentals

# 2.1. Mouse functions

Left mouse button

  Left mouse button let you draw a rectangle which will become the next picture. The center of the rectangle will be the center of the new picture. X/Y ratio will be adapted to fit into the window.

Middle mouse button

  Middle mouse button zooms in.

Right mouse button

  Right mouse button zooms out.

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