Translate RShape in a class

Contributed Library Questions

yuccav34

in Contributed Library Questions • 9 months ago

Hello, I have a problem with an RShape in a class that drive me crazy.

class Pied {

float type;
float positionX;
float positionY;
float rotation;
float echelle;
RShape theSVG;

Pied(float leType, RShape leSVG, float posX, float posY, float rota, float echel) {
    positionX = posX;
    positionY = posY;
    rotation = rota;
    echelle = echel;
    type = leType;
    theSVG = leSVG;
}


void display() {
    pushMatrix();
        translate(positionX, positionY); // with translation, it's OK
        theSVG.translate(0, 0);
        theSVG.rotate(rotation); // ok, rotate with no error
        theSVG.scale(echelle); // ok, scale with no error
        theSVG.draw();
    popMatrix();

}

}

Now, in the display() fonction, if I translate directly theSVG, it doesn't translate.

void display() {
    pushMatrix();
        theSVG.translate(positionX, positionY); // no translation.
        theSVG.rotate(rotation); // ok, rotate with no error
        theSVG.scale(echelle); // ok, scale with no error
        theSVG.draw();
    popMatrix();

}

So rotate & scaling work fine with RShape in class... But translate not... any ideas ?
Thanks in advance.

Replies(4)

PhiLho

Re: Translate RShape in a class

9 months ago

rotate() and scale() actually transforms the SVG shape. But translate() acts relative to a referential, while a PShape is standalone: it won't transform the shape, as it has nothing as reference for the move.
Not sure if it makes sense...

yuccav34

Re: Translate RShape in a class

9 months ago

I understand... Thanks a lot PhiLho.
I'm now going to think about how to perform what I want without translating the PShape. I want to make intersection detection with geomerative library, so I need to test intersection beetween two Rshape placed in the stage randomly (RPoint[] ps = RShape1.getIntersections(RShape2);).
Thank you one more time.

PhiLho

Re: Translate RShape in a class

9 months ago

I haven't noticed it was RShape and not PShape...
So this belongs to the Contributed Library Questions section, not to the Programming Questions.
I moved this topic.

Note that the implementation can memorize the translation as an offset, that could be applied when drawing the shape. Apparently, it doesn't do that.

yuccav34

Re: Translate RShape in a class

9 months ago

That's ok, I made a mistake, the translation is well done, but as I doesn't translate the RShape with the center reference, I just need to do the scale and rotation before. It was so simple and a so classic mistake.

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