src/main/java/eu/svjatoslav/sixth/e3d/renderer/raster/shapes/composite/base/AbstractCompositeShape.java

   1 /*
   2  * Sixth 3D engine. Author: Svjatoslav Agejenko.
   3  * This project is released under Creative Commons Zero (CC0) license.
   4  */
   5 package eu.svjatoslav.sixth.e3d.renderer.raster.shapes.composite.base;
   6
   7 import eu.svjatoslav.sixth.e3d.geometry.Point3D;
   8 import eu.svjatoslav.sixth.e3d.gui.RenderingContext;
   9 import eu.svjatoslav.sixth.e3d.gui.UserRelativityTracker;
  10 import eu.svjatoslav.sixth.e3d.gui.humaninput.MouseInteractionController;
  11 import eu.svjatoslav.sixth.e3d.math.Transform;
  12 import eu.svjatoslav.sixth.e3d.math.TransformsPipeline;
  13 import eu.svjatoslav.sixth.e3d.renderer.raster.Color;
  14 import eu.svjatoslav.sixth.e3d.renderer.raster.RenderAggregator;
  15 import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.AbstractShape;
  16 import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.basic.line.Line;
  17 import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.basic.solidpolygon.SolidPolygon;
  18 import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.basic.texturedpolygon.TexturedPolygon;
  19 import eu.svjatoslav.sixth.e3d.renderer.raster.slicer.Slicer;
  20
  21 import java.util.ArrayList;
  22 import java.util.List;
  23 import java.util.stream.Collectors;
  24
  25 /**
  26  * In order to get perspective correct textures, large textured polygons are
  27  * sliced into smaller ones.
  28  */
  29
  30 public class AbstractCompositeShape extends AbstractShape {
  31     private final List<SubShape> originalSubShapes = new ArrayList<>();
  32     private final UserRelativityTracker relativityTracker;
  33     double currentSliceFactor = 5;
  34     private List<AbstractShape> renderedSubShapes = new ArrayList<>();
  35     private boolean slicingOutdated = true;
  36     private Transform transform;
  37
  38     public AbstractCompositeShape() {
  39         this(new Transform());
  40     }
  41
  42     public AbstractCompositeShape(final Point3D location) {
  43         this(new Transform(location));
  44     }
  45
  46     public AbstractCompositeShape(final Transform transform) {
  47         this.transform = transform;
  48         relativityTracker = new UserRelativityTracker();
  49     }
  50
  51     public void addShape(final AbstractShape shape) {
  52         addShape(shape, null);
  53     }
  54
  55     public void addShape(final AbstractShape shape, final String groupId) {
  56         final SubShape subShape = new SubShape(shape);
  57         subShape.setGroup(groupId);
  58         subShape.setVisible(true);
  59         originalSubShapes.add(subShape);
  60         slicingOutdated = true;
  61     }
  62
  63     /**
  64      * This method should be overridden by anyone wanting to customize shape
  65      * before it is rendered.
  66      */
  67     public void beforeTransformHook(final TransformsPipeline transformPipe,
  68                                     final RenderingContext context) {
  69     }
  70
  71     public Point3D getLocation() {
  72         return transform.getTranslation();
  73     }
  74
  75     public List<SubShape> getOriginalSubShapes() {
  76         return originalSubShapes;
  77     }
  78
  79     public UserRelativityTracker getRelativityTracker() {
  80         return relativityTracker;
  81     }
  82
  83     public void hideGroup(final String groupIdentifier) {
  84         originalSubShapes.stream().filter(subShape -> subShape.matchesGroup(groupIdentifier)).forEach(subShape -> {
  85             subShape.setVisible(false);
  86             slicingOutdated = true;
  87         });
  88     }
  89
  90     private boolean isReslicingNeeded(double sliceFactor1, double sliceFactor2) {
  91
  92         if (slicingOutdated)
  93             return true;
  94
  95         if (sliceFactor1 > sliceFactor2) {
  96             final double tmp = sliceFactor1;
  97             sliceFactor1 = sliceFactor2;
  98             sliceFactor2 = tmp;
  99         }
 100
 101         return (sliceFactor2 / sliceFactor1) > 1.5d;
 102
 103     }
 104
 105     public void removeGroup(final String groupIdentifier) {
 106         final java.util.Iterator<SubShape> iterator = originalSubShapes
 107                 .iterator();
 108
 109         while (iterator.hasNext()) {
 110             final SubShape subShape = iterator.next();
 111             if (subShape.matchesGroup(groupIdentifier)) {
 112                 iterator.remove();
 113                 slicingOutdated = true;
 114             }
 115         }
 116     }
 117
 118     public List<SubShape> getGroup(final String groupIdentifier) {
 119         return originalSubShapes.stream().filter(
 120                 subShape -> subShape.matchesGroup(groupIdentifier))
 121                 .collect(Collectors.toList());
 122     }
 123
 124     private void resliceIfNeeded() {
 125
 126         final double proposedSliceFactor = relativityTracker
 127                 .proposeSliceFactor();
 128
 129         if (isReslicingNeeded(proposedSliceFactor, currentSliceFactor)) {
 130             currentSliceFactor = proposedSliceFactor;
 131             slice();
 132         }
 133     }
 134
 135     /**
 136      * Paint solid elements of this composite shape into given color.
 137      */
 138     public void setColor(final Color color) {
 139         for (final SubShape subShape : getOriginalSubShapes()) {
 140             final AbstractShape shape = subShape.getShape();
 141
 142             if (shape instanceof SolidPolygon)
 143                 ((SolidPolygon) shape).setColor(color);
 144
 145             if (shape instanceof Line)
 146                 ((Line) shape).color = color;
 147         }
 148     }
 149
 150     public void setGroupForUngrouped(final String groupIdentifier) {
 151         originalSubShapes.stream().filter(SubShape::isUngrouped).forEach(subShape -> subShape.setGroup(groupIdentifier));
 152     }
 153
 154     @Override
 155     public void setMouseInteractionController(
 156             final MouseInteractionController mouseInteractionController) {
 157         super.setMouseInteractionController(mouseInteractionController);
 158
 159         for (final SubShape subShape : originalSubShapes)
 160             subShape.getShape().setMouseInteractionController(
 161                     mouseInteractionController);
 162
 163         slicingOutdated = true;
 164
 165     }
 166
 167     public void setTransform(final Transform transform) {
 168         this.transform = transform;
 169     }
 170
 171     public void showGroup(final String groupIdentifier) {
 172         originalSubShapes.stream().filter(subShape -> subShape.matchesGroup(groupIdentifier)).forEach(subShape -> {
 173             subShape.setVisible(true);
 174             slicingOutdated = true;
 175         });
 176     }
 177
 178     private void slice() {
 179         slicingOutdated = false;
 180
 181         final List<AbstractShape> result = new ArrayList<>();
 182
 183         final Slicer slicer = new Slicer(currentSliceFactor);
 184         originalSubShapes.stream().filter(subShape -> subShape.isVisible()).forEach(subShape -> {
 185             if (subShape.getShape() instanceof TexturedPolygon)
 186                 slicer.slice((TexturedPolygon) subShape.getShape());
 187             else
 188                 result.add(subShape.getShape());
 189         });
 190
 191         result.addAll(slicer.getResult());
 192
 193         renderedSubShapes = result;
 194     }
 195
 196     @Override
 197     public void transform(final TransformsPipeline transformPipe,
 198                           final RenderAggregator aggregator, final RenderingContext context) {
 199
 200         // add current composite shape transform to the end of the transform
 201         // pipeline
 202         transformPipe.addTransform(transform);
 203
 204         relativityTracker.analyze(transformPipe, context);
 205
 206         beforeTransformHook(transformPipe, context);
 207
 208         // hack, to get somewhat perspective correct textures
 209         resliceIfNeeded();
 210
 211         // transform rendered subshapes
 212         for (final AbstractShape shape : renderedSubShapes)
 213             shape.transform(transformPipe, aggregator, context);
 214
 215         transformPipe.dropTransform();
 216     }
 217
 218 }