protected void initElements() {
super.initElements();
for (int i = 0; i < P.length; i++) {
setOutputDependencies(P[i]);
}
tMin = g.getMinParameter();
tMax = g.getMaxParameter();
Color BLUE_VIOLET = new Color(153, 0, 255);
int THICK_LINE_WITHIN_LINE = 4;
// TODO: this initialization of input assumes the type
// of the line and the conic
// and will NOT update anymore.
// should change to a more dynamic version.
lines = new GeoLine[4];
lines[0] = (GeoLine) g.copyInternal(cons);
if (Double.isInfinite(tMin)) lines[1] = new GeoRay(cons);
else lines[1] = new GeoSegment(cons);
lines[2] = new GeoSegment(cons);
if (Double.isInfinite(tMax)) lines[3] = new GeoRay(cons);
else lines[3] = new GeoSegment(cons);
for (int i = 0; i < 4; i++) {
setOutputDependencies(lines[i]);
lines[i].setLineThickness(THICK_LINE_WITHIN_LINE);
lines[i].setObjColor(BLUE_VIOLET);
}
// paramSet.add(tMin);
// paramSet.add(tMax);
}
protected void compute() {
super.compute();
numberOfPoints = 0;
for (int i = 0; i < P.length; i++) {
if (P[i].isDefined()) numberOfPoints++;
}
// build lines
numberOfOutputLines = 0;
initCurrentPartIsInRegion();
switch (intersectionType) {
case INTERSECTION_PRODUCING_LINE: // contained in degenerate conic
case INTERSECTION_ASYMPTOTIC_LINE: // intersect at no point
case INTERSECTION_PASSING_LINE: // intersect at no point
lines[1].setUndefined();
lines[2].setUndefined();
lines[3].setUndefined();
if (!currentPartIsInRegion) lines[0].setUndefined();
else {
lines[0].set(g);
numberOfOutputLines++;
}
break;
case INTERSECTION_MEETING_LINE:
lines[0].setUndefined();
lines[2].setUndefined();
if (currentPartIsInRegion) {
lines[3].setUndefined();
// set line[1]
double t = g.getPossibleParameter(Q[0].getCoords());
if (tMin.isInfinite()) {
((GeoRay) lines[1]).set(Q[0], g);
lines[1].changeSign();
numberOfOutputLines++;
} else {
if (Kernel.isGreater(tMin, t)) lines[1].setUndefined();
else {
((GeoSegment) lines[3]).set(Q[0], g.endPoint, g);
numberOfOutputLines++;
}
}
} else {
lines[1].setUndefined();
// set line[3]
double t = g.getPossibleParameter(Q[0].getCoords());
if (tMax.isInfinite()) {
((GeoRay) lines[3]).set(Q[0], g);
numberOfOutputLines++;
} else {
if (Kernel.isGreater(tMin, t)) lines[1].setUndefined();
else {
((GeoSegment) lines[3]).set(Q[0], g.endPoint, g);
numberOfOutputLines++;
}
}
}
break;
case INTERSECTION_TANGENT_LINE: // tangent at one point
lines[0].setUndefined();
if (currentPartIsInRegion) {
// set line[1] and line[3]
double t = g.getPossibleParameter(Q[0].getCoords());
if (tMin.isInfinite()) {
((GeoRay) lines[1]).set(Q[0], g);
lines[1].changeSign();
numberOfOutputLines++;
} else {
if (Kernel.isGreater(tMin, t)) lines[1].setUndefined();
else {
((GeoSegment) lines[3]).set(Q[0], g.endPoint, g);
numberOfOutputLines++;
}
}
if (tMax.isInfinite()) {
((GeoRay) lines[3]).set(Q[0], g);
numberOfOutputLines++;
} else {
if (Kernel.isGreater(tMin, t)) lines[1].setUndefined();
else {
((GeoSegment) lines[3]).set(Q[0], g.endPoint, g);
numberOfOutputLines++;
}
}
} else {
lines[1].setUndefined();
lines[3].setUndefined();
}
break;
case INTERSECTION_SECANT_LINE: // intersect at two points
// get parameters of two intersection points
double t1 = g.getPossibleParameter(Q[0].getCoords());
double t2 = g.getPossibleParameter(Q[1].getCoords());
int j0 = 0;
int j1 = 1;
// let t1<=t2. if not, swap the index of the points
if (t1 > t2) {
double temp = t1;
t1 = t2;
t2 = temp;
j1 = 0;
j0 = 1;
}
lines[0].setUndefined();
if (currentPartIsInRegion) {
lines[2].setUndefined();
// set line[1] and line[3]
if (tMin.isInfinite()) {
((GeoRay) lines[1]).set(Q[j0], g);
lines[1].changeSign();
numberOfOutputLines++;
} else {
if (Kernel.isGreater(tMin, t1)) lines[1].setUndefined();
else {
((GeoSegment) lines[1]).set(Q[j0], g.endPoint, g);
numberOfOutputLines++;
}
}
if (tMax.isInfinite()) {
((GeoRay) lines[3]).set(Q[j1], g);
numberOfOutputLines++;
} else {
if (Kernel.isGreater(t2, tMax)) lines[3].setUndefined();
else {
((GeoSegment) lines[3]).set(Q[j1], g.endPoint, g);
numberOfOutputLines++;
}
}
} else {
lines[1].setUndefined();
lines[3].setUndefined();
// set line[2]
if (Kernel.isGreater(t1, tMax) || Kernel.isGreater(tMin, t2)) lines[2].setUndefined();
else {
((GeoSegment) lines[2])
.set(
Kernel.isGreater(tMin, t1) ? g.startPoint : Q[j0],
Kernel.isGreater(t2, tMax) ? g.endPoint : Q[j1],
g);
numberOfOutputLines++;
}
}
break;
}
refreshOutput();
setLabelsForPointsAndLines();
}