scanpathPlot: This function reads in a picture file specified by the user,...

In garyfeng/pdata: Process Data Analysis and Reporting for Large Scale Educatoinal Assessment

Description

This function reads in a picture file specified by the user, then overlays it with a heat map computed according to user specifications.

Usage

scanpathPlot(dframe, pict, path = ".", outputtitle, dx = 0, dy = 60,
  alphaLevel = 0.4, arrows = T, pathAlpha = 0.8, pathSize = 0.7,
  sColor = "red", mColor = "green", eColor = "blue", x0 = -1, y0 = -1,
  x1 = -1, y1 = -1)

Arguments

dframe	Data frame containing the data to be used, with at least $x, $y, and $dur
pict	String giving the base name of the PNG file to be used, e.g., "background.png"
path	String giving the path of the PNG file to be used, e.g., path=getwd()
outputtitle	Optional argument, allowing the user to specify the output title
dx	Optional argument, adjustment to x dimension, default to 0px
dy	Optional argument, adjustment to y dimension, default to 60px
alphaLevel	Optional argument, transparency level, default to 0.4
arrows	Optional argument, whether to draw arrows or just fixations; default to T
pathAlpha	Optional argument, transparency level for paths, default to 0.8
pathSize	Optional argument, path size default to 0.7
sColor	Optional argument, starting color, default to "red"
mColor	Optional argument, median color, default to "green"
eColor	Optional argument, end color, default to "blue"

Value

ggplot object: heat map or fixation map of gaze time overlayed onto a picture read from file

Examples

scanpathPlot(tmp, paste(storyName, ".png", sep=""), path=getwd(),
    alphaLevel = alphaLevel)

garyfeng/pdata documentation built on May 16, 2019, 5:42 p.m.