Move window origin to lower left

General Discussion Other

wonders19..

Move window origin to lower left

in General Discussion • Other • 1 year ago

Hello.

I find it very awkward that the origin of positions start at top left and increases bottom-rightward.

Is there any coordinate-command to change this to a more conventional coordinate system? With the origin placed in the most bottom left pixel of the window for example with x increasing to the right and y increasing to the top?

It would help much, changes in orientation and signals from equations to the program makes everything more difficult...

Thanks.

Replies(3)

calsign

Re: Move window origin to lower left

1 year ago

It's not that simple to change the coordinate origin of an entire platform. You can, however, manipulate the matrix:

void setup() {
//setup() code
}
void draw() (
scale(1, -1);
translate(0, -height);
//draw() code
}

Of course, it isn't always that easy; this will only apply to drawing. When you want to get, say, the mouse location, or use the pixels array, this will still have the origin in the top-left corner. To avoid confusion, it is probably best to simply adapt to using the top-left system.

wonders19..

Re: Move window origin to lower left

1 year ago

Ok, that helped, thanks calsign, that was fast :)

Jo Wood

Re: Move window origin to lower left

1 year ago

Beware though that the solution above will also flip any text or images upside down. If you stick with it and need to display text, you could add a method like the following that is called in place of text().

void rText(String txt, float xPos, float yPos)

{

pushMatrix();

translate(xPos,yPos);

scale(1,-1);

text(txt,0,0);

popMatrix();

}

Should be easy to create the equivalent for images.

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