public final void compute() {
// Check if the points are aligned
double x1 = -A.inhomX;
double y1 = -A.inhomY;
double x2 = -B.inhomX;
double y2 = -B.inhomY;
double x3 = -C.inhomX;
double y3 = -C.inhomY;
double det = (-x2 + x3) * (y1 - y3) + (x1 - x3) * (y2 - y3);
if (Kernel.isZero(det)) {
poly.setUndefined();
} else {
ycoef[0].setValue((x3 - x2) / det);
xcoef[0].setValue((y2 - y3) / det);
constant[0].setValue(((x3 - x2) * y3 + (y2 - y3) * x3) / det);
ycoef[1].setValue((x1 - x3) / det);
xcoef[1].setValue((y3 - y1) / det);
constant[1].setValue(((x1 - x3) * y1 + (y3 - y1) * x1) / det);
ycoef[2].setValue((x2 - x1) / det);
xcoef[2].setValue((y1 - y2) / det);
constant[2].setValue(((x2 - x1) * y2 + (y1 - y2) * x2) / det);
dd.update();
poly.update();
}
}
public AlgoTriangleCurve(
Construction cons,
String label,
GeoPoint2 A,
GeoPoint2 B,
GeoPoint2 C,
GeoImplicitPoly e,
GeoNumeric a,
GeoNumeric b,
GeoNumeric c) {
super(cons);
this.A = A;
this.B = B;
this.C = C;
this.n = e;
AlgoDependentImplicitPoly d = (AlgoDependentImplicitPoly) n.getParentAlgorithm();
ExpressionNode lhs = (ExpressionNode) d.getEquation().getLHS().deepCopy(kernel);
ExpressionNode rhs = (ExpressionNode) d.getEquation().getRHS().deepCopy(kernel);
ExpressionNode[] abcExp = new ExpressionNode[3];
GeoDummyVariable x = new GeoDummyVariable(cons, "x");
GeoDummyVariable y = new GeoDummyVariable(cons, "y");
xcoef = new GeoNumeric[3];
ycoef = new GeoNumeric[3];
constant = new GeoNumeric[3];
for (int i = 0; i < 3; i++) {
xcoef[i] = new GeoNumeric(cons);
ycoef[i] = new GeoNumeric(cons);
constant[i] = new GeoNumeric(cons);
abcExp[i] =
new ExpressionNode(
kernel,
new ExpressionNode(
kernel,
new ExpressionNode(kernel, xcoef[i], Operation.MULTIPLY, x),
Operation.PLUS,
new ExpressionNode(kernel, ycoef[i], Operation.MULTIPLY, y)),
Operation.PLUS,
constant[i]);
}
eq = new Equation(kernel, lhs, rhs);
eq.replace(a, abcExp[0]);
eq.replace(b, abcExp[1]);
eq.replace(c, abcExp[2]);
eq.setForceImplicitPoly();
eq.initEquation();
boolean flag = cons.isSuppressLabelsActive();
AbstractApplication.debug(flag);
dd = new AlgoDependentImplicitPoly(cons, label, eq);
cons.removeFromConstructionList(dd);
poly = dd.getOutput()[0];
setInputOutput();
compute();
cons.setSuppressLabelCreation(flag);
poly.setLabel(label);
}