Drawing lines from screen border

General Discussion Other

yonnak

Drawing lines from screen border

in General Discussion • Other • 8 months ago

Hello,

I'd like to draw lines from each screen corner to a 3d point, whatever transformation is applied to the sketch.
I can't figure out how to find each corner coordinates when the sketch is translated.

How can I achieve that?

Thanks.

Replies(2)

tfguy44

Re: Drawing lines from screen border

8 months ago

Example:

void setup(){
size(400,400, P3D);
}
void draw(){
background(0);
pushMatrix();
translate(width/2,height/2,-30);
scale(100);
rotateY( (millis()%5000)*TWO_PI/5000 );
stroke(255);
noFill();
box(2);
float tx = screenX(-1,-1,-1);
float ty = screenY(-1,-1,-1);
popMatrix();
stroke(255,255,0);
line(0,0,tx,ty);
line(width,0,tx,ty);
line(width,height,tx,ty);
line(0,height,tx,ty);
}

The trick is using screenX and screenY.

yonnak

Re: Drawing lines from screen border

8 months ago

It works!

Thank you.

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Drawing lines from screen border

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