protected double getSegmentLength(LW2DVertex start, LW2DVertex end) {
double l = MathUtils.distance(start.getPoint(), end.getPoint());
if (start.getBulge() == 0.0) {
return l;
} else {
double alpha = 4 * Math.atan(Math.abs(start.getBulge()));
double r = l / (2 * Math.sin(alpha / 2));
double d = (Math.PI * Math.toDegrees(alpha) * r) / 180;
return d;
}
}
public Bounds getBounds() {
Bounds bounds = new Bounds();
Iterator<LW2DVertex> i = vertices.iterator();
if (i.hasNext()) {
LW2DVertex last;
LW2DVertex first;
LW2DVertex v = null;
last = first = i.next();
bounds.addToBounds(last.getX(), last.getY(), 0.0);
while (i.hasNext()) {
v = i.next();
addToBounds(last, v, bounds);
last = v;
}
if ((v != null) && (v.getBulge() != 0.0)) {
addToBounds(v, first, bounds);
}
} else {
bounds.setValid(false);
}
return bounds;
}
protected void addToBounds(LW2DVertex start, LW2DVertex end, Bounds bounds) {
if (start.getBulge() != 0) {
// calculte the height
double l = MathUtils.distance(start.getPoint(), end.getPoint());
// double h = Math.abs(last.getBulge()) * l / 2;
double r = this.getRadius(start.getBulge(), l);
double s = l / 2;
Vector edgeDirection = MathUtils.getVector(start.getPoint(), end.getPoint());
edgeDirection = MathUtils.normalize(edgeDirection);
Point3D centerPoint = MathUtils.getPointOfStraightLine(start.getPoint(), edgeDirection, s);
Vector centerPointDirection =
MathUtils.crossProduct(edgeDirection, this.getExtrusion().getNormal());
centerPointDirection = MathUtils.normalize(centerPointDirection);
// double t = Math.sqrt(Math.pow(r, 2) - Math.pow(s, 2));
// double t = 0;
double h = Math.abs(start.getBulge() * l) / 2;
// if(Math.abs(start.getBulge())>=1.0){
// t = h-r;
// }else{
// //t = Math.sqrt(Math.pow(r, 2) - Math.pow(s, 2));
// t=r-h;
// }
// the center point of the arc
int startQ = 0;
int endQ = 0;
double bulge = start.getBulge();
if (bulge > 0) {
// the arc goes over the right side, but where is the center
// point?
if (bulge > 1.0) {
double t = h - r;
centerPoint = MathUtils.getPointOfStraightLine(centerPoint, centerPointDirection, t);
} else {
double t = r - h;
centerPoint =
MathUtils.getPointOfStraightLine(centerPoint, centerPointDirection, (-1 * t));
}
endQ = MathUtils.getQuadrant(end.getPoint(), centerPoint);
startQ = MathUtils.getQuadrant(start.getPoint(), centerPoint);
} else {
// the arc goes over the left side, but where is the center
// point?
if (bulge < -1.0) {
double t = h - r;
centerPoint =
MathUtils.getPointOfStraightLine(centerPoint, centerPointDirection, (-1 * t));
} else {
double t = r - h;
centerPoint = MathUtils.getPointOfStraightLine(centerPoint, centerPointDirection, t);
}
startQ = MathUtils.getQuadrant(end.getPoint(), centerPoint);
endQ = MathUtils.getQuadrant(start.getPoint(), centerPoint);
}
if (endQ < startQ) {
endQ += 4;
} else if ((endQ == startQ) && (Math.abs(start.getBulge()) > QUARTER_CIRCLE_ANGLE)) {
endQ += 4;
}
while (endQ > startQ) {
switch (startQ) {
case 0:
bounds.addToBounds(centerPoint.getX(), centerPoint.getY() + r, centerPoint.getZ());
break;
case 1:
bounds.addToBounds(centerPoint.getX() - r, centerPoint.getY(), centerPoint.getZ());
break;
case 2:
bounds.addToBounds(centerPoint.getX(), centerPoint.getY() - r, centerPoint.getZ());
break;
case 3:
bounds.addToBounds(centerPoint.getX() + r, centerPoint.getY(), centerPoint.getZ());
endQ -= 4;
startQ -= 4;
break;
}
startQ++;
}
}
bounds.addToBounds(start.getPoint());
bounds.addToBounds(end.getPoint());
}