get current rotation

Programming Questions

clankill3r

in Programming Questions • 1 year ago

For color it was possible to get the current stoke color for example with something like.

println(g.fill.x);

println(g.fill.y);

println(g.fill.z);

to get the red green blue

Is there a same kind of thing to get the current rotation?

Replies(3)

hellochar

If you take a look at PGraphics source code there's a very undocumented "fillColor" variable (located at line 248); this should give you the packed fill color (which you can then call red(), green(), blue() on).

The current rotation is much more difficult since in general there isn't a "current rotation" - imagine if you first translated, then rotated, then translated again.

jbum

Re: get current rotation

1 year ago

There's an undocumented function getMatrix() which returns the current transformation matrix. From this I was able to cobble together this (inefficient) function for determining the current 2d rotation, expressed in radians.

float[] cmat = new float[6];
float get2DRotationInRadians()
{
PMatrix pm = getMatrix();
pm.get(cmat);
return atan2(cmat[3], cmat[0]);
}

You can determine current translation and scaling using a similar technique.

clankill3r

Re: get current rotation

1 year ago

cool thanks!

Top Reply