wrGraph (version 1.3.8)

.predPointsPix: Predict and return pixel location of points of current plot

Description

This function allows predicting the pixel location of points of current plot. Note: may be imprecise in case of x or y with all same values.

Usage

.predPointsPix(
  x,
  y,
  dimPng,
  res,
  marg,
  fromTop = TRUE,
  scExt = 0.04,
  displ = FALSE,
  callFrom = NULL,
  silent = FALSE,
  debug = FALSE
)

Value

This function returns a numeric matrix with 2 columns 'xPix' and 'yPix' (with length(x) rows); and optionally a plot (if argument displ=TRUE)

Arguments

x

(numeric) initial coordinates for plot

y

(numeric) initial coordinates for plot

dimPng

(numeric, length=2) width and hight of png

res

(numeric, length=1) resultion of png

marg

(numeric, length=4) margins in inches (as given by par(mar=c(...)))

fromTop

(logical) default counting in html is from top

scExt

(numeric, length=1) extending scale (default at 0.04 ie 4 %)

displ

(logical) optional plot

callFrom

(character) allows easier tracking of messages produced

silent

(logical) suppress messages

debug

(logical) additonal messages for debugging

See Also

convertPlotCoordPix, mouseOverHtmlFile

Examples

.predPointsPix(x=c(1,100), y=c(1,100), dimPng=c(700,600), res=200, marg=c(5,4,4,2))