identify_rect: Create a rectangle to be used in identifying

In ggobi/cranvas: Interactive statistical graphics based on Qt

Description

To identify cases under the mouse, we need a small rectangle to look for cases in this rectangle. This function creates such a rectangle using meta$pos (mouse position) and meta$limits (layer limits).

Usage

identify_rect(meta)

Arguments

meta	the meta data containing at least meta$pos and meta$limits

Details

Currently the size of the rectangle is 1% of the layer limits.

Value

A Qt rectangle object (see qrect)

Author(s)

Yihui Xie <http://yihui.name>

Examples

## see source code of, e.g., qparallel()

ggobi/cranvas documentation built on May 17, 2019, 3:10 a.m.