    001/* ===========================================================
    002 * Orson Charts : a 3D chart library for the Java(tm) platform
    003 * ===========================================================
    004 *
    005 * (C)opyright 2013-2016, by Object Refinery Limited.  All rights reserved.
    006 *
    007 * http://www.object-refinery.com/orsoncharts/index.html
    008 *
    009 * This program is free software: you can redistribute it and/or modify
    010 * it under the terms of the GNU General Public License as published by
    011 * the Free Software Foundation, either version 3 of the License, or
    012 * (at your option) any later version.
    013 *
    014 * This program is distributed in the hope that it will be useful,
    015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
    016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    017 * GNU General Public License for more details.
    018 *
    019 * You should have received a copy of the GNU General Public License
    020 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    021 *
    022 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
    023 * Other names may be trademarks of their respective owners.]
    024 *
    025 * If you do not wish to be bound by the terms of the GPL, an alternative
    026 * commercial license can be purchased.  For details, please see visit the
    027 * Orson Charts home page:
    028 *
    029 * http://www.object-refinery.com/orsoncharts/index.html
    030 *
    031 */
    032
    033package com.orsoncharts.graphics3d;
    034
    035import java.awt.Shape;
    036import java.awt.geom.Path2D;
    037import java.awt.geom.Point2D;
    038import java.awt.geom.Rectangle2D;
    039import java.util.List;
    040import java.util.ArrayList;
    041
    042/**
    043 * Rendering info returned from the {@link Drawable3D} {@code draw()}
    044 * method.
    045 *
    046 * @since 1.3
    047 */
    048public class RenderingInfo {
    049
    050    /**
    051     * A list of the faces drawn in order of rendering.
    052     */
    053    private List<Face> faces;
    054
    055    /** The projected points for the vertices in the faces. */
    056    Point2D[] projPts;
    057
    058    /** The x-translation. */
    059    private double dx;
    060
    061    /** The y-translation. */
    062    public double dy;
    063
    064    /**
    065     * Storage for rendered elements in the model other than the 3D objects
    066     * (caters for code that overlays other items such as labels).
    067     */
    068    List<RenderedElement> otherElements;
    069
    070    List<RenderedElement> otherOffsetElements;
    071
    072    /**
    073     * Creates a new instance.
    074     *
    075     * @param faces  the rendered faces (in order of rendering).
    076     * @param projPts  the projected points for all vertices in the 3D model.
    077     * @param dx  the x-delta.
    078     * @param dy  the y-delta.
    079     */
    080    public RenderingInfo(List<Face> faces, Point2D[] projPts, double dx,
    081            double dy) {
    082        this.faces = faces;
    083        this.projPts = projPts;
    084        this.dx = dx;
    085        this.dy = dy;
    086        this.otherElements = new ArrayList<RenderedElement>();
    087        this.otherOffsetElements = new ArrayList<RenderedElement>();
    088    }
    089
    090    /**
    091     * Returns the list of faces rendered.
    092     *
    093     * @return The list of faces.
    094     */
    095    public List<Face> getFaces() {
    096        return this.faces;
    097    }
    098
    099    /**
    100     * Returns the projected points.
    101     *
    102     * @return The projected points.
    103     */
    104    public Point2D[] getProjectedPoints() {
    105        return this.projPts;
    106    }
    107
    108    /**
    109     * Returns the x-translation amount.  All projected points are centered
    110     * on (0, 0) but the rendering to the screen (or other Graphics2D target)
    111     * performs two translations: the first is to the center of the bounding
    112     * rectangle, and the second is to apply the translate2D attribute of the
    113     * chart.  The result of these translations is stored here and used in the
    114     * fetchObjectAt(x, y) method.
    115     *
    116     * @return The x-translation.
    117     */
    118    public double getDX() {
    119        return this.dx;
    120    }
    121
    122    /**
    123     * Returns the y-translation amount.
    124     *
    125     * @return The y-translation.
    126     */
    127    public double getDY() {
    128        return this.dy;
    129    }
    130
    131    /**
    132     * Adds a rendered element to the rendering info.
    133     *
    134     * @param element  the element ({@code null} not permitted).
    135     */
    136    public void addElement(RenderedElement element) {
    137        this.otherElements.add(element);
    138    }
    139
    140    /**
    141     * Adds a rendered element to the list of offset elements.
    142     *
    143     * @param element  the element ({@code null} not permitted).
    144     */
    145    public void addOffsetElement(RenderedElement element) {
    146        this.otherOffsetElements.add(element);
    147    }
    148
    149    /**
    150     * Fetches the object, if any, that is rendered at {@code (x, y)}.
    151     *
    152     * @param x  the x-coordinate.
    153     * @param y  the y-coordinate.
    154     *
    155     * @return The object (or {@code null}).
    156     */
    157    public Object3D fetchObjectAt(double x, double y) {
    158        for (int i = this.faces.size() - 1; i >= 0; i--) {
    159            Face f = this.faces.get(i);
    160            if (f instanceof LabelFace) {
    161                Rectangle2D bounds
    162                        = (Rectangle2D) f.getOwner().getProperty("labelBounds");
    163                if (bounds != null && bounds.contains(x - dx, y - dy)) {
    164                    return f.getOwner();
    165                }
    166            } else {
    167                Path2D p = f.createPath(this.projPts);
    168                if (p.contains(x - dx, y - dy)) {
    169                    return f.getOwner();
    170                }
    171            }
    172        }
    173        return null;
    174    }
    175
    176    /**
    177     * Finds the rendered element, if any, at the location {@code (x, y)}.
    178     * The method first calls fetchObjectAt(x, y) to see if there is an
    179     * object at the specified location and, if there is, returns a new
    180     * RenderedElement instance for that object.  Otherwise, it searches the
    181     * otherElements list to see if there is some other element (such as a
    182     * title, legend, axis label or axis tick label) and returns that item.
    183     * Finally, if no element is found, the method returns {@code null}.
    184     *
    185     * @param x  the x-coordinate.
    186     * @param y  the y-coordinate.
    187     *
    188     * @return The interactive element or {@code null}.
    189     */
    190    public RenderedElement findElementAt(double x, double y) {
    191        for (int i = this.otherElements.size() - 1; i >= 0; i--) {
    192            RenderedElement element = this.otherElements.get(i);
    193            Shape bounds = (Shape) element.getProperty(RenderedElement.BOUNDS);
    194            if (bounds.contains(x, y)) {
    195                return element;
    196            }
    197        }
    198
    199        for (int i = this.otherOffsetElements.size() - 1; i >= 0; i--) {
    200            RenderedElement element = this.otherOffsetElements.get(i);
    201            Shape bounds = (Shape) element.getProperty(RenderedElement.BOUNDS);
    202            if (bounds != null && bounds.contains(x - dx, y - dy)) {
    203                return element;
    204            }
    205        }
    206
    207        Object3D obj = fetchObjectAt(x, y);
    208        if (obj != null) {
    209            RenderedElement element = new RenderedElement("obj3d", null);
    210            element.setProperty(Object3D.ITEM_KEY,
    211                    obj.getProperty(Object3D.ITEM_KEY));
    212            if (obj.getProperty(Object3D.CLASS_KEY) != null) {
    213                element.setProperty(Object3D.CLASS_KEY,
    214                        obj.getProperty(Object3D.CLASS_KEY));
    215            }
    216            return element;
    217        }
    218        return null;
    219    }
    220
    221}