Getting absolute vector position

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2minuteno..

Getting absolute vector position

in Programming Questions • 1 year ago

Hello,

I'm still learning how to draw in processing, so this may be a very basic question.

I want to draw a line between two points.

The first point is relative to another randome point which which is generated inside a rotate/translate.

e.g.

pushMatrix();
translate(randomX, randomY);
rotate(randomAngle);
...
PVector point1 = new PVector(randomX+200, randomY+200);
popMatrix();

The second known point is absolute to my applet frame.

How can I get the absolute position of point1 to draw a line between the two??

Thanks!!

Replies(4)

amnon.owed

Re: Getting absolute vector position

1 year ago

Perhaps you can use modelX() and modelY().

2minuteno..

Re: Getting absolute vector position

1 year ago

Thanks for the reply. modelX()/modelY() appears to be what I'm after, but I'm not drawing in 3D space, and it always returns (0,0,0).

Any other suggestions?

Thank!

calsign

Re: Getting absolute vector position

1 year ago

Let's see...
If I have this right, the first point is being translated and rotated by random values...
I think you need trigonometry...

Like this (untested)?

PVector secondPoint = new PVector(randomX + cos(randomAngle) + 200, randomY + sin(randomAngle) + 200);

2minuteno..

Re: Getting absolute vector position

1 year ago

I was able to use screenX/screenY and divide it by my scale factor to get the positions.

Thanks for your help!

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