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   1 /*
   2  * Sixth 3D engine. Copyright ©2012-2020, 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.gui.RenderingContext;
  14 import eu.svjatoslav.sixth.e3d.gui.UserRelativityTracker;
  15 import eu.svjatoslav.sixth.e3d.gui.humaninput.MouseInteractionController;
  16 import eu.svjatoslav.sixth.e3d.math.Transform;
  17 import eu.svjatoslav.sixth.e3d.math.TransformPipe;
  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 import java.util.stream.Collectors;
  29
  30 /**
  31  * In order to get perspective correct textures, large textured polygons are
  32  * sliced into smaller ones.
  33  */
  34
  35 public class AbstractCompositeShape extends AbstractShape {
  36     private final List<SubShape> originalSubShapes = new ArrayList<>();
  37     private final UserRelativityTracker relativityTracker;
  38     double currentSliceFactor = 5;
  39     private List<AbstractShape> renderedSubShapes = new ArrayList<>();
  40     private boolean slicingOutdated = true;
  41     private Transform transform;
  42
  43     public AbstractCompositeShape() {
  44         this(new Transform());
  45     }
  46
  47     public AbstractCompositeShape(final Point3D location) {
  48         this(new Transform(location));
  49     }
  50
  51     public AbstractCompositeShape(final Transform transform) {
  52         this.transform = transform;
  53         relativityTracker = new UserRelativityTracker();
  54     }
  55
  56     public void addShape(final AbstractShape shape) {
  57         addShape(shape, null);
  58     }
  59
  60     public void addShape(final AbstractShape shape, final String groupId) {
  61         final SubShape subShape = new SubShape(shape);
  62         subShape.setGroup(groupId);
  63         subShape.setVisible(true);
  64         originalSubShapes.add(subShape);
  65         slicingOutdated = true;
  66     }
  67
  68     /**
  69      * This method should be overridden by anyone wanting to customize shape
  70      * before it is rendered.
  71      */
  72     public void beforeTransformHook(final TransformPipe transformPipe,
  73                                     final RenderingContext context) {
  74     }
  75
  76     public Point3D getLocation() {
  77         return transform.getTranslation();
  78     }
  79
  80     public List<SubShape> getOriginalSubShapes() {
  81         return originalSubShapes;
  82     }
  83
  84     public UserRelativityTracker getRelativityTracker() {
  85         return relativityTracker;
  86     }
  87
  88     public void hideGroup(final String groupIdentifier) {
  89         originalSubShapes.stream().filter(subShape -> subShape.matchesGroup(groupIdentifier)).forEach(subShape -> {
  90             subShape.setVisible(false);
  91             slicingOutdated = true;
  92         });
  93     }
  94
  95     private boolean isReslicingNeeded(double sliceFactor1, double sliceFactor2) {
  96
  97         if (slicingOutdated)
  98             return true;
  99
 100         if (sliceFactor1 > sliceFactor2) {
 101             final double tmp = sliceFactor1;
 102             sliceFactor1 = sliceFactor2;
 103             sliceFactor2 = tmp;
 104         }
 105
 106         return (sliceFactor2 / sliceFactor1) > 1.5d;
 107
 108     }
 109
 110     public void removeGroup(final String groupIdentifier) {
 111         final java.util.Iterator<SubShape> iterator = originalSubShapes
 112                 .iterator();
 113
 114         while (iterator.hasNext()) {
 115             final SubShape subShape = iterator.next();
 116             if (subShape.matchesGroup(groupIdentifier)) {
 117                 iterator.remove();
 118                 slicingOutdated = true;
 119             }
 120         }
 121     }
 122
 123     public List<SubShape> getGroup(final String groupIdentifier) {
 124         return originalSubShapes.stream().filter(
 125                 subShape -> subShape.matchesGroup(groupIdentifier))
 126                 .collect(Collectors.toList());
 127     }
 128
 129     private void resliceIfNeeded() {
 130
 131         final double proposedSliceFactor = relativityTracker
 132                 .proposeSliceFactor();
 133
 134         if (isReslicingNeeded(proposedSliceFactor, currentSliceFactor)) {
 135             currentSliceFactor = proposedSliceFactor;
 136             slice();
 137         }
 138     }
 139
 140     /**
 141      * Paint solid elements of this composite shape into given color.
 142      */
 143     public void setColor(final Color color) {
 144         for (final SubShape subShape : getOriginalSubShapes()) {
 145             final AbstractShape shape = subShape.getShape();
 146
 147             if (shape instanceof SolidPolygon)
 148                 ((SolidPolygon) shape).setColor(color);
 149
 150             if (shape instanceof Line)
 151                 ((Line) shape).color = color;
 152         }
 153     }
 154
 155     public void setGroupForUngrouped(final String groupIdentifier) {
 156         originalSubShapes.stream().filter(SubShape::isUngrouped).forEach(subShape -> subShape.setGroup(groupIdentifier));
 157     }
 158
 159     @Override
 160     public void setMouseInteractionController(
 161             final MouseInteractionController mouseInteractionController) {
 162         super.setMouseInteractionController(mouseInteractionController);
 163
 164         for (final SubShape subShape : originalSubShapes)
 165             subShape.getShape().setMouseInteractionController(
 166                     mouseInteractionController);
 167
 168         slicingOutdated = true;
 169
 170     }
 171
 172     public void setTransform(final Transform transform) {
 173         this.transform = transform;
 174     }
 175
 176     public void showGroup(final String groupIdentifier) {
 177         originalSubShapes.stream().filter(subShape -> subShape.matchesGroup(groupIdentifier)).forEach(subShape -> {
 178             subShape.setVisible(true);
 179             slicingOutdated = true;
 180         });
 181     }
 182
 183     private void slice() {
 184         slicingOutdated = false;
 185
 186         final List<AbstractShape> result = new ArrayList<>();
 187
 188         final Slicer slicer = new Slicer(currentSliceFactor);
 189         originalSubShapes.stream().filter(subShape -> subShape.isVisible()).forEach(subShape -> {
 190             if (subShape.getShape() instanceof TexturedPolygon)
 191                 slicer.slice((TexturedPolygon) subShape.getShape());
 192             else
 193                 result.add(subShape.getShape());
 194         });
 195
 196         result.addAll(slicer.getResult());
 197
 198         renderedSubShapes = result;
 199     }
 200
 201     @Override
 202     public void transform(final TransformPipe transformPipe,
 203                           final RenderAggregator aggregator, final RenderingContext context) {
 204
 205         // add current composite shape transform to the end of the transform
 206         // pipeline
 207         transformPipe.addTransform(transform);
 208
 209         relativityTracker.analyze(transformPipe, context);
 210
 211         beforeTransformHook(transformPipe, context);
 212
 213         // hack, to get somewhat perspective correct textures
 214         resliceIfNeeded();
 215
 216         // transform rendered subshapes
 217         for (final AbstractShape shape : renderedSubShapes)
 218             shape.transform(transformPipe, aggregator, context);
 219
 220         transformPipe.dropTransform();
 221     }
 222
 223 }