SVG rotate problem

Programming Questions

Kristoffer

in Programming Questions • 3 months ago

Hi all,

I can't get a handle on why this my rotations are all over the place. I think this code should really work:

s = loadShape("svg/Worms/ian-symbol-lumbricus-spp-1.svg");

....

pushMatrix();

translate(-s.width/2,-s.height/2);

rotate(PI*random(2));

shape (s);

popMatrix();

The shape is in the top lefthand corner before rotation - but after the rotation its all over the place, What have I misunderstood?

Replies(2)

PhiLho

Re: SVG rotate problem

3 months ago

pushMatrix();
translate(mouseX, mouseY); // For example
rotate(PI*random(2));
translate(-s.width/2,-s.height/2);
shape (s);
popMatrix();

should work better.

mbraendle

You don't shift the object to the origin, but you have to shift the origin to the center of the object before you rotate. Assuming the left-upper-point of your shape is at x,y and you want to rotate it around its mid-point:

pushMatrix();
translate(x + s.width/2,y+s.height/2);
rotate(PI*random(2));
shape(s, -s.width/2, -s.height/2,s.width,s.height);
popMatrix();

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