gazeHeatmap: 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

gazeHeatmap(dframe, pict, path, outputtitle = "User Output",
  colormin = "white", colormax = "red4", screendim = c(1680, 1050),
  transparancyLevel = 0.4, ngridpoints = 100, showFixations = F)

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 or JPEG file to be used, e.g., "background.png"
path	String giving the path of the PNG or JPEG file to be used, e.g., path=getwd()
outputtitle	Optional argument, allowing the user to specify the output title
colormin	Optional argument, allowing the user to specify the color corresponding to the lowest value of the heat map
colormax	Optional argument, allowing the user to specify the color corresponding to the highest value of the heat map
screendim	Optional argument, allowing the user to specify the dimensions of the screen that was viewed
transparancyLevel	Optional argument, allowing the user to set the transparancy level of the heat map
ngridpoints	Optional argument, allowing the user to set the resolution of the heat map
showFixations	Optional argument, to show individual fixations if TRUE; default to FALSE for heat map

Value

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

Examples

gazeHeatmap(tmp, paste(storyName, " Summary", sep=""), path=getwd(),
    screendim = screenSize, transparancyLevel = alphaLevel, ngridpoints = 200,
    showFixations = F)

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