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   1 /*
   2  * Sixth 3D engine. Copyright ©2012-2016, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 3 of the GNU Lesser General Public License
   6  * or later as published by the Free Software Foundation.
   7  *
   8  */
   9
  10 package eu.svjatoslav.sixth.e3d.renderer.raster.shapes.composite.base;
  11
  12 import eu.svjatoslav.sixth.e3d.geometry.Point3D;
  13 import eu.svjatoslav.sixth.e3d.geometry.Transform;
  14 import eu.svjatoslav.sixth.e3d.geometry.TransformPipe;
  15 import eu.svjatoslav.sixth.e3d.gui.RenderingContext;
  16 import eu.svjatoslav.sixth.e3d.gui.UserRelativityTracker;
  17 import eu.svjatoslav.sixth.e3d.gui.humaninput.MouseInteractionController;
  18 import eu.svjatoslav.sixth.e3d.renderer.raster.Color;
  19 import eu.svjatoslav.sixth.e3d.renderer.raster.RenderAggregator;
  20 import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.AbstractShape;
  21 import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.basic.line.Line;
  22 import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.basic.solidpolygon.SolidPolygon;
  23 import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.basic.texturedpolygon.TexturedPolygon;
  24 import eu.svjatoslav.sixth.e3d.renderer.raster.slicer.Slicer;
  25
  26 import java.util.ArrayList;
  27 import java.util.List;
  28
  29 /**
  30  * In order to get perspective correct textures, large textured polygons are
  31  * sliced into smaller ones.
  32  */
  33
  34 public class AbstractCompositeShape extends AbstractShape {
  35     private final List<SubShape> originalSubShapes = new ArrayList<>();
  36     private final UserRelativityTracker relativityTracker;
  37     double currentSliceFactor = 5;
  38     private List<AbstractShape> renderedSubShapes = new ArrayList<>();
  39     private boolean slicingOutdated = true;
  40     private Transform transform;
  41
  42     public AbstractCompositeShape() {
  43         this(new Transform());
  44     }
  45
  46     public AbstractCompositeShape(final Point3D location) {
  47         this(new Transform(location));
  48     }
  49
  50     public AbstractCompositeShape(final Transform transform) {
  51         this.transform = transform;
  52         relativityTracker = new UserRelativityTracker();
  53     }
  54
  55     public void addShape(final AbstractShape shape) {
  56         addShape(shape, null);
  57     }
  58
  59     public void addShape(final AbstractShape shape, final String groupId) {
  60         final SubShape subShape = new SubShape(shape);
  61         subShape.setGroup(groupId);
  62         subShape.setVisible(true);
  63         originalSubShapes.add(subShape);
  64         slicingOutdated = true;
  65     }
  66
  67     /**
  68      * This method should be overridden by anyone wanting to customize shape
  69      * before it is rendered.
  70      */
  71     public void beforeTransformHook(final TransformPipe transformPipe,
  72                                     final RenderingContext context) {
  73     }
  74
  75     public Point3D getLocation() {
  76         return transform.getTranslation();
  77     }
  78
  79     public List<SubShape> getOriginalSubShapes() {
  80         return originalSubShapes;
  81     }
  82
  83     public UserRelativityTracker getRelativityTracker() {
  84         return relativityTracker;
  85     }
  86
  87     public void hideGroup(final String groupIdentifier) {
  88         originalSubShapes.stream().filter(subShape -> subShape.matchesGroup(groupIdentifier)).forEach(subShape -> {
  89             subShape.setVisible(false);
  90             slicingOutdated = true;
  91         });
  92     }
  93
  94     private boolean isReslicingNeeded(double sliceFactor1, double sliceFactor2) {
  95
  96         if (slicingOutdated)
  97             return true;
  98
  99         if (sliceFactor1 > sliceFactor2) {
 100             final double tmp = sliceFactor1;
 101             sliceFactor1 = sliceFactor2;
 102             sliceFactor2 = tmp;
 103         }
 104
 105         return (sliceFactor2 / sliceFactor1) > 1.5d;
 106
 107     }
 108
 109     public void removeGroup(final String groupIdentifier) {
 110         final java.util.Iterator<SubShape> iterator = originalSubShapes
 111                 .iterator();
 112
 113         while (iterator.hasNext()) {
 114             final SubShape subShape = iterator.next();
 115             if (subShape.matchesGroup(groupIdentifier)) {
 116                 iterator.remove();
 117                 slicingOutdated = true;
 118             }
 119         }
 120     }
 121
 122     private void resliceIfNeeded() {
 123
 124         final double proposedSliceFactor = relativityTracker
 125                 .proposeSliceFactor();
 126
 127         if (isReslicingNeeded(proposedSliceFactor, currentSliceFactor)) {
 128             currentSliceFactor = proposedSliceFactor;
 129             slice();
 130         }
 131     }
 132
 133     /**
 134      * Paint solid elements of this composite shape into given color.
 135      */
 136     public void setColor(final Color color) {
 137         for (final SubShape subShape : getOriginalSubShapes()) {
 138             final AbstractShape shape = subShape.getShape();
 139
 140             if (shape instanceof SolidPolygon)
 141                 ((SolidPolygon) shape).setColor(color);
 142
 143             if (shape instanceof Line)
 144                 ((Line) shape).color = color;
 145         }
 146     }
 147
 148     public void setGroupForUngrouped(final String groupIdentifier) {
 149         originalSubShapes.stream().filter(subShape -> subShape.isUngrouped()).forEach(subShape -> subShape.setGroup(groupIdentifier));
 150     }
 151
 152     @Override
 153     public void setMouseInteractionController(
 154             final MouseInteractionController mouseInteractionController) {
 155         super.setMouseInteractionController(mouseInteractionController);
 156
 157         for (final SubShape subShape : originalSubShapes)
 158             subShape.getShape().setMouseInteractionController(
 159                     mouseInteractionController);
 160
 161         slicingOutdated = true;
 162
 163     }
 164
 165     public void setTransform(final Transform transform) {
 166         this.transform = transform;
 167     }
 168
 169     public void showGroup(final String groupIdentifier) {
 170         originalSubShapes.stream().filter(subShape -> subShape.matchesGroup(groupIdentifier)).forEach(subShape -> {
 171             subShape.setVisible(true);
 172             slicingOutdated = true;
 173         });
 174     }
 175
 176     private void slice() {
 177         slicingOutdated = false;
 178
 179         final List<AbstractShape> result = new ArrayList<>();
 180
 181         final Slicer slicer = new Slicer(currentSliceFactor);
 182         originalSubShapes.stream().filter(subShape -> subShape.isVisible()).forEach(subShape -> {
 183             if (subShape.getShape() instanceof TexturedPolygon)
 184                 slicer.slice((TexturedPolygon) subShape.getShape());
 185             else
 186                 result.add(subShape.getShape());
 187         });
 188
 189         result.addAll(slicer.getResult());
 190
 191         renderedSubShapes = result;
 192     }
 193
 194     @Override
 195     public void transform(final TransformPipe transformPipe,
 196                           final RenderAggregator aggregator, final RenderingContext context) {
 197
 198         // add current composite shape transform to the end of the transform
 199         // pipeline
 200         transformPipe.addTransform(transform);
 201
 202         relativityTracker.analyze(transformPipe, context);
 203
 204         beforeTransformHook(transformPipe, context);
 205
 206         // hack, to get somewhat perspective correct textures
 207         resliceIfNeeded();
 208
 209         // transform rendered subshapes
 210         for (final AbstractShape shape : renderedSubShapes)
 211             shape.transform(transformPipe, aggregator, context);
 212
 213         transformPipe.dropTransform();
 214     }
 215
 216 }