Sample code that reads/writes pgm images and that draws lines on the images is provided.
image.* : Image class (2-D array of integers, along with size, number of colors)
(For our purposes the number of colors is 256)
image_demo.cc : Sample main() function for testing.
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To compile in Linux:
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make all
To run:
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./image_demo objects.pgm objects_output.pgm
This will open image objects.pgm, will draw a line on the image, and will save resulting image to file objects_output.pgm
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To view .pgm files you can use the open source program gimp:
https://www.gimp.org/