You must use beginShape() or beginShape(POLYGON) before curveVertex()

Programming Questions

clankill3r

in Programming Questions • 1 year ago

I get this error:

Exception in thread "Animation Thread" java.lang.RuntimeException: You must use beginShape() or beginShape(POLYGON) before curveVertex()

However, i use beginShape. Strange thing is when i go from P2D or OPENGL to JAVA2D then the problem is gone.

I have had this before and sometimes it's just random, as in, trying to run the sketch a few times then sometimes it works.

Does anyone have a clue what it can be?

In case someone is interested then i can upload the project later. It's to big to post here.

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edit:

just discovered that it has to do with extreme large coördinates, like a x value of -10000.

Does anyone know the maximum values?

Replies(3)

dr.mo

1 year ago

can you post the offending code? do you really need coordinates that large, as chances are they will be off the screen!!

clankill3r

1 year ago

Turns out that the value isn't even that large since it's a float.

x: 25.565413

y: 217.78337

so i'm clueless.

Here's the whole project, i don't have time to strip the code, also that would might solve the problem without finding it..

datamosh

10 months ago

maybe it's too late and it isn't really an answer but i solved your issue by commenting the ellipse inside your for loop in the draw:

void draw() {
update();
//if (pointsX[0].value > -1000 && pointsY[0].value > -1000 && pointsX[0].value < width+1000 && pointsY[0].value < height+1000) {
beginShape(POLYGON);
curveVertex(pointsX[0].value, pointsY[0].value);
for (int i = 0; i < steps; i++) {
curveVertex(pointsX[i].value, pointsY[i].value);
// ellipse(pointsX[i].value, pointsY[i].value, 5, 5);
}
curveVertex(pointsX[steps-1].value, pointsY[steps-1].value);
endShape();
// }
}

I just was searching for issue related with curveVertex not closing the polygon.

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