draw_identify: Draw the identify labels under the mouse

In ggobi/cranvas: Interactive statistical graphics based on Qt

Description

The identify labels are generated by specific plotting functions, and this function draw them as texts under the mouse, with a transparent gray background.

Usage

draw_identify(layer, painter, data, meta)

Arguments

layer	the layer argument of the painting function
painter	the painter argument of the painting function
data	the data object used by the plot
meta	the meta object in the plot

Details

These components in the meta data are required to draw the labels: meta$pos (mouse position), meta$limits (layer limits) and meta$identify.labels (labels to draw). The color of the labels is set in the brush object as brush(data)$label.color.

The label will automatically adjust its own positions to ensure it does not exceed the plot margin. For example, when the mouse is near the right margin, the label will be drawn to the left.

Value

NULL

Author(s)

Yihui Xie <http://yihui.name>

Examples

## see source code of qparallel() or qhist()

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