error when ellipse has negative width and height

[shiffman]

The following:

ellipse(width/2,height/2,-1,-1);

produces:

Uncaught IndexSizeError: Failed to execute 'arc' on 'CanvasRenderingContext2D': The radius provided (-0.5) is negative.

I'm not sure what the proper behavior should be since this isn't really valid code, but Processing I believe draws the ellipse with the absolute value of the negative values (inverted?).

The behavior for rect(100,100,-50,-50) for example draws the rectangle, but inverted (i.e. pointing up and to the left).

[crhallberg]

Processing behavior confirmed.

[GoToLoop]

I've already more or less reported about that in:
http://forum.processing.org/two/discussion/7147/some-simple-pulse-equations-using-trig-#Item_11
https://github.com/lmccart/p5.js/issues/383

Function ellipse() can't have negative dimensions.

I had to use abs() before passing the argument. That is true for both P5.JS & Processing.JS!

[lmccart]

fixed with https://github.com/lmccart/p5.js/pull/416

[GoToLoop]

Unfortunately, that https://github.com/lmccart/p5.js/pull/416 fix doesn't extend the same principle to rect() & arc()! 😔

[lmccart]

@GoToLoop rect already supports this

[GoToLoop]

I fail to spot any Math.abs() upon "width" & "height" parameters before calling canvas.modeAdjust() in rect()! And from the P5.JS's reference page, rect() w/ negative dimensions is still bugged!
Perhaps it's not updated to latest merged version... 😳