Flip options?

[prismlyuk]

Hi, this is really awesome, great work.

A part of the aesthetic I'm not too keen on when glitching images (manually or using this library) is that images generally always have the same characteristics from top to bottom. I.e. the images have a tenancy to 'slip' in one direction and the changes in the 'lines of glitch' within the glitched image as you look from the top of the image to the bottom generally have a 'step' up (look like steps).

To try and get around this, so the glitch effect is kind of more uniform, a nice feature would be flip the canvas vertically before an iteration, and then flip it back for the next iteration, and so on. And the final result would be the same way up as your started. I've hacked this in to the current version of the library I'm using but it's not very pretty.

Here's an example of with and without flipping during the glitch process:

For my purposes it has given me better results.

Essentially I used this before every iteration:
ctx.setTransform(1, 0, 0, -1, 0, canvas.height);

Interested to hear your thoughts!

[snorpey]

@causticforms thank you for your interest in this project and for taking the time to dig into the code and write this detailled issue!
the results you posted look really promising and i'm definitely interested in adding this functionality to the library.

would you be willing to add a pull request that includes this feature?

thanks again!