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