How to draw line by changing the pixel color between two points?

I want to draw the vertical line between two points and store that output image in some variable for further processing

I have done this line by changing pixel color of pixels between two points. we can done this by using for loop. But it takes more time.

Problem:

'% (548,493) (548,191)

x1=548;

y1=493;

x2=548;

y2=191;'

How to draw the line by changing the pixel color without using loop.

Answer 1

[Walter Roberson]

The difficulty with a for loop is calculating the correct pixels to write into. There is a standard algorithm for this though: see Bresenham's Line Algorithm.

You could also be a bit lazy and use an existing tool.

You could use poly2mask and supply it with the endpoint coordinates and the array size. A logical mask would be output that is true at each location along the path. You would then set those locations to the desired color.

I was going to mention another possibility but I think the above is much easier.

If I recall there is also a routine in the Computer Vision Toolbox that can be used to draw a line inside an array.