translate method
Translates this matrix by the given scalar values.
Implementation
Matrix3 translate(double tx, double ty) {
final te = storage;
te[0] += tx * te[2];
te[3] += tx * te[5];
te[6] += tx * te[8];
te[1] += ty * te[2];
te[4] += ty * te[5];
te[7] += ty * te[8];
return this;
}