Draw the cone of view for Line of Sight Object

What I want is to have a cone (or triangle) will draw wherever the Line of Sight is facing, not just that but also change shape depending on if it's being blocked by a solid object or something.

Something similar to this:

<img src="http://img14.imageshack.us/img14/1595/after.png" border="0">

So far I've used a graphic for the job, which works except when there is a wall that's only one tile wide:

<img src="https://dl.dropboxusercontent.com/u/30381754/LineofSight.png" border="0">

I was thinking that it could be done with primitives, or going through the viewport position in a for loop and drawing a pixel if in line of sight, but neither appear to be included into Construct2 for some reason.

Any ideas?

I've tried making a 2D forloop, but doing a 2D for loop for over a million elements doesn't appear to be a good idea. :/

<img src="https://dl.dropboxusercontent.com/u/30381754/2D%20Forloop.png" border="0" />

It's usually referred to as "shadow casting". There are a number of examples on the forums if you search.

Heres one. http://www.scirra.com/forum/capx-yet-another-shadow-caster_topic75045.html

It's usually referred to as "shadow casting". There are a number of examples on the forums if you search.

Heres one. http://www.scirra.com/forum/capx-yet-another-shadow-caster_topic75045.html

Thanks for the link, while it's good, I don't want to cast shadows, I just want to block out the light, I also want it to only to only show light from within the cone of view.

At least now I have a way of drawing primitives thanks to the Canvas Plugin now. <img src="smileys/smiley1.gif" border="0" align="middle">