tkimageRead {tkImgR}

Tk commands to deal with images

Description

These commands create, read, copy, write, and delete images using the 'tcltk' package.

Usage

tkimageRead(imageName = NULL, fileName, ...)

tkimageCreate(imageName = NULL, ...)

tkimageCopy(imageName, sourceImage, ...)

tkimageWrite(imageName, fileName, ...)

tkimageDelete(imageName)

Arguments

imageName

Specifies the name for the image; if is NULL then Tk picks a name of the form image#, where # is an integer.

fileName

The path for the image file.

...

Further arguments.

sourceImage

The name (or the tcl object) of the image to be copied.

Value

tclObj with the image if the function is tkimageCreate, tkimageRead, and tkimageCopy or no value for tkimageWrite or tkimageDelete

Examples

#tkimageRead
file_path <- system.file("img", "example.png", package = "tkImgR")
im01 <- tkimageRead("tkImage01", file_path)
"tkImage01" %in% as.character(tcltk::.Tcl("image names"))
tkimageDelete(im01)


#tkimageCreate
file_path <- system.file("img", "example.png", package = "tkImgR")
im1 <- tkimageCreate("tkImage01")
tkimage.height(im1) #0
im1 <- tkimageCreate("tkImage01", file_path)
tkimage.height(im1) #2824
"tkImage01" %in% as.character(tcltk::.Tcl("image names"))
tkimageDelete(im1)


#tkimageCopy
file_path <- system.file("img", "example.png", package = "tkImgR")
im1 <- tkimageCreate("tkImage01", file_path)
im3 <- tkimageCreate("tkImage03")
tkimageCopy(im3, "tkImage01")
c("tkImage01","tkImage03") %in% as.character(tcltk::.Tcl("image names"))
tkimageDelete(im1)
tkimageDelete(im3)


#tkimageWrite
file_path <- system.file("img", "example.png", package = "tkImgR")
im1 <- tkimageCreate("tkImage01", file_path)
file_path_crop_image <- file.path(tempdir(check = TRUE), "crop.png")
#if is possible to write the file
if (file.access(file_path_crop_image)==0){
 tkimageWrite(im1, file_path_crop_image, from=c(0,1500))
 im1_crop <- tkimageRead("tkImage01_crop", file_path_crop_image)
 print(tkimage.height(im1)) #2824
 print(tkimage.height(im1_crop)) #1324 = 2824 - 1500
 tkimageDelete(im1_crop)
}


#tkimageDelete
file_path <- system.file("img", "example.png", package = "tkImgR")
im1 <- tkimageCreate("tkImage01", file_path)
 "tkImage01" %in% as.character(tcltk::.Tcl("image names"))
 tkimageDelete(im1)
  "tkImage01" %in% as.character(tcltk::.Tcl("image names"))