Connect two pixels

Draw a line between two pixels with any grayscale in any image.

Description

Connect two pixels in an image with the desired graylevel

Command line
------------
result = func_DrawLine(Img, X1, Y1, X2, Y2)
input: Img : the original image.
          (X1, Y1), (X2, Y2) : points to connect.
          nG : the gray level of the line.
output: result

Note
----
  Img can be anything
  (X1, Y1), (X2, Y2) should be NOT be OUT of the Img

  The computation cost of this program is around half as Cubas's [1]
  [1] As for Cubas's code, please refer
  http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=4177

Example
-------
result = func_DrawLine(zeros(5, 10), 2, 1, 5, 10, 1)
result =
     0 0 0 0 0 0 0 0 0 0
     1 1 1 0 0 0 0 0 0 0
     0 0 0 1 1 1 0 0 0 0
     0 0 0 0 0 0 1 1 1 0
     0 0 0 0 0 0 0 0 0 1

• MATLAB release: MATLAB 6.5 (R13)

[HY WANG]

 

[user anonymous]

Does n't work really well - the lines are broken and sometimes it doesn't connect the two pixels at all!!

[chim wicket]

very good, it save much time for me.

[Afshan naz]

 

[Yuan luo]

good

[kevino z]

yeah, it seems that the line is always one pixel to the right and above the start/end points

[Saeed Mozaffari]

It works well

[Ed Zwaan]

It doesn't draw a line straight between the pixels, it has some offset.

[cano lee]

interesting, but could u disclose more technical details?

[Rajesh Govind]

I agree there exists jaggedness while it traces the line, but otherwise, I like the implementation :) Good work appreciated .. this saved my time as well ! Thanks a ton !

[Graham Cranston]

input coordinates X and Y are implemented inverted. That is, the coordinates given as X0 and X1 are used as the starting and ending ROW in the matrix, and vice versa. A simple find replace fixed the problem.

[Jamie Schirf]

Thanks for sharing. This was just what I needed for a task.

[Omar]

Thanks for sharing.
I would suggest adding a line thickness option.