First (incomplete) efforts toward a Circle3DObject class.

This commit is contained in:
Glen Whitney 2018-09-08 21:37:05 -04:00
parent bb1c2813be
commit a7963fe8db
2 changed files with 126 additions and 0 deletions

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@ -508,6 +508,7 @@ text.circle=Circle around % through %
text.circle.fixed=Circle around % through % with radius % text.circle.fixed=Circle around % through % with radius %
text.fixedcircle=Circle around % with radius % text.fixedcircle=Circle around % with radius %
text.circle3=Circle around % with radius from % to % text.circle3=Circle around % with radius from % to %
text.circle3d=3D Circle around % with radius % and normal %
text.parallel=Parallel line through % to % text.parallel=Parallel line through % to %
text.midpoint=Midpoint between % and % text.midpoint=Midpoint between % and %
text.quadric=Conic section through % text.quadric=Conic section through %

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@ -0,0 +1,125 @@
/*
Coyright 2018 Glen Whitney
This file is contributed to C.a.R./CaRMetal software.
C.a.R. is a free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 3 of the License.
C.a.R. is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package rene.zirkel.objects;
import rene.gui.Global;
import rene.zirkel.construction.Construction;
import rene.zirkel.construction.ConstructionException;
import rene.zirkel.expression.Expression;
/* A three dimensional circle determined by a 3D point (the "midpoint" of the super
object), an expression giving its radius, and a TwoPointLineObject
determined by two 3D points, giving its normal direction. (The line does
not have to go through the center.
*/
public class Circle3DObject extends PrimitiveCircleObject {
Expression E_R; // Expression for the radius
TwoPointLineObject N;
public Circle3DObject(final Construction c, final PointObject C,
final String s, final TwoPointLineObject L)
throws ConstructionException {
super(c, C);
if (!C.is3D()) {
throw new ConstructionException("Cannot create Circle3D with "
+ "non-3D center " + C.getName());
}
if (!L.getP1().is3D() || !L.getP2().is3D()) {
throw new ConstructionException("Cannot create Circle3D with "
+ "non-3D normal " + L.getName());
}
E_R = new Expression(s, c, this);
N = L;
validate();
updateText();
}
@Override
public String getTag() {
return "Circle3D";
}
@Override
public void updateText() {
setText(text3(Global.name("text.circle3D"),
M.getName(), E_R.toString(), N.getName()));
}
@Override
public void validate() {
super.validate();
Valid = false;
if (!M.valid() || !E_R.valid() || !N.valid()) {
return;
}
try { R = E_R.getValue(); } catch (final Exception e) {
R = 0;
return;
}
if (R < 0) { return; }
Valid = true;
}
@Override
public void printArgs(final XmlWriter xml) {
xml.printArg("radius", E_R.toString());
xml.printArg("normal", N.getName());
super.printArgs(xml);
}
@Override
public String getStringLength() {
return E_R.toString();
}
@Override
public double getValue() throws ConstructionException {
if (!Valid) {
throw new InvalidException("exception.invalid");
} else {
return R;
}
}
@Override
public Enumeration depending() {
super.depending();
final Enumeration e = E_R.getDepList().elements();
while (e.hasMoreElements()) {
DL.add((ConstructionObject) e.nextElement());
}
DL.add(N);
return DL.elements();
}
/* A (rudimentary version) of the class is almost done at this point, but
it still needs a paint() method. This we want to share with the
QuadricObject. The best way I could think of was to create a class that
encapsulates the X[..] data in QuadricObject, with a method to set that
up from 5 (x,y) pairs. In QuadricObject, I woul just use the 5 (x,y)
values of the Point members. Here, in validate, I would use the center,
radius, and normal data to compute 5 equally-spaced (x,y,z) coordinates
around the circle. The sticking point is then projecting those to
(x,y). There does not seem to be any good way to do it -- it seems like
Expressions that do it are littered all around the code. Ugh. So I am
giving up for now.
*/
}