src/main/java/eu/svjatoslav/sixth/e3d/renderer/raster/shapes/basic/texturedpolygon/TexturedPolygon.java

   1 /*
   2  * Sixth 3D engine. Copyright ©2012-2018, 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.basic.texturedpolygon;
  11
  12 import eu.svjatoslav.sixth.e3d.geometry.Point2D;
  13 import eu.svjatoslav.sixth.e3d.geometry.Point3D;
  14 import eu.svjatoslav.sixth.e3d.geometry.Polygon;
  15 import eu.svjatoslav.sixth.e3d.gui.RenderingContext;
  16 import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.AbstractCoordinateShape;
  17 import eu.svjatoslav.sixth.e3d.renderer.raster.slicer.PolygonCoordinate;
  18 import eu.svjatoslav.sixth.e3d.renderer.raster.texture.Texture;
  19 import eu.svjatoslav.sixth.e3d.renderer.raster.texture.TextureBitmap;
  20
  21 import java.awt.*;
  22
  23 public class TexturedPolygon extends AbstractCoordinateShape {
  24
  25     public final Texture texture;
  26     final PolygonBorderInterpolator[] is = new PolygonBorderInterpolator[]{
  27             new PolygonBorderInterpolator(), new PolygonBorderInterpolator(),
  28             new PolygonBorderInterpolator()};
  29     /**
  30      * Polygon texture coordinates.
  31      */
  32     public Point2D texturePoint1, texturePoint2, texturePoint3;
  33     private boolean showBorders = false;
  34     private double totalTextureDistance = -1;
  35
  36     public TexturedPolygon(final Point3D p1, final Point3D p2,
  37                            final Point3D p3, final Point2D tp1, final Point2D tp2,
  38                            final Point2D tp3, final Texture texture) {
  39
  40         super(p1, p2, p3);
  41
  42         texturePoint1 = tp1;
  43         texturePoint2 = tp2;
  44         texturePoint3 = tp3;
  45
  46         this.texture = texture;
  47     }
  48
  49     public TexturedPolygon(final PolygonCoordinate pc1,
  50                            final PolygonCoordinate pc2, final PolygonCoordinate pc3,
  51                            final Texture texture) {
  52
  53         this(pc1.space, pc2.space, pc3.space, pc1.texture, pc2.texture,
  54                 pc3.texture, texture);
  55     }
  56
  57     private void computeTotalTextureDistance() {
  58         // compute total texture distance
  59         totalTextureDistance = texturePoint1.getDistanceTo(texturePoint2);
  60         totalTextureDistance += texturePoint1.getDistanceTo(texturePoint3);
  61         totalTextureDistance += texturePoint2.getDistanceTo(texturePoint3);
  62     }
  63
  64     private void drawHorizontalLine(final PolygonBorderInterpolator line1,
  65                                     final PolygonBorderInterpolator line2, final int y,
  66                                     final RenderingContext renderBuffer,
  67                                     final TextureBitmap textureBitmap) {
  68
  69         line1.setCurrentY(y);
  70         line2.setCurrentY(y);
  71
  72         int x1 = line1.getX();
  73         int x2 = line2.getX();
  74
  75         final double tx2, ty2;
  76         final double tx1, ty1;
  77
  78         if (x1 <= x2) {
  79
  80             tx1 = line1.getTX() * textureBitmap.multiplicationFactor;
  81             ty1 = line1.getTY() * textureBitmap.multiplicationFactor;
  82
  83             tx2 = line2.getTX() * textureBitmap.multiplicationFactor;
  84             ty2 = line2.getTY() * textureBitmap.multiplicationFactor;
  85
  86         } else {
  87             final int tmp = x1;
  88             x1 = x2;
  89             x2 = tmp;
  90
  91             tx1 = line2.getTX() * textureBitmap.multiplicationFactor;
  92             ty1 = line2.getTY() * textureBitmap.multiplicationFactor;
  93
  94             tx2 = line1.getTX() * textureBitmap.multiplicationFactor;
  95             ty2 = line1.getTY() * textureBitmap.multiplicationFactor;
  96         }
  97
  98         final double realWidth = x2 - x1;
  99         final double realX1 = x1;
 100
 101         if (x1 < 0)
 102             x1 = 0;
 103
 104         if (x2 >= renderBuffer.width)
 105             x2 = renderBuffer.width - 1;
 106
 107         int renderBufferOffset = ((y * renderBuffer.width) + x1) * 4;
 108         final byte[] renderBufferBytes = renderBuffer.pixels;
 109
 110         final double twidth = tx2 - tx1;
 111         final double theight = ty2 - ty1;
 112
 113         for (int x = x1; x < x2; x++) {
 114
 115             final double distance = x - realX1;
 116
 117             final double tx = tx1 + ((twidth * distance) / realWidth);
 118             final double ty = ty1 + ((theight * distance) / realWidth);
 119
 120             final int textureOffset = textureBitmap.getAddress((int) tx,
 121                     (int) ty);
 122
 123             textureBitmap.drawPixel(textureOffset, renderBufferBytes,
 124                     renderBufferOffset);
 125
 126             renderBufferOffset += 4;
 127         }
 128
 129     }
 130
 131     @Override
 132     public void paint(final RenderingContext renderBuffer) {
 133
 134         final Point2D projectedPoint1 = coordinates[0].onScreenCoordinate;
 135         final Point2D projectedPoint2 = coordinates[1].onScreenCoordinate;
 136         final Point2D projectedPoint3 = coordinates[2].onScreenCoordinate;
 137
 138         projectedPoint1.roundToInteger();
 139         projectedPoint2.roundToInteger();
 140         projectedPoint3.roundToInteger();
 141
 142         if (mouseInteractionController != null)
 143             if (renderBuffer.mouseClick != null)
 144                 if (Polygon.pointWithinPolygon(
 145                         renderBuffer.mouseClick.coordinate, projectedPoint1,
 146                         projectedPoint2, projectedPoint3))
 147                     renderBuffer.clickedItem = mouseInteractionController;
 148
 149         // Show polygon boundaries (for debugging)
 150         if (showBorders)
 151             showBorders(renderBuffer);
 152
 153         // find top-most point
 154         int yTop = (int) projectedPoint1.y;
 155
 156         if (projectedPoint2.y < yTop)
 157             yTop = (int) projectedPoint2.y;
 158
 159         if (projectedPoint3.y < yTop)
 160             yTop = (int) projectedPoint3.y;
 161
 162         if (yTop < 0)
 163             yTop = 0;
 164
 165         // find bottom-most point
 166         int yBottom = (int) projectedPoint1.y;
 167
 168         if (projectedPoint2.y > yBottom)
 169             yBottom = (int) projectedPoint2.y;
 170
 171         if (projectedPoint3.y > yBottom)
 172             yBottom = (int) projectedPoint3.y;
 173
 174         if (yBottom >= renderBuffer.height)
 175             yBottom = renderBuffer.height - 1;
 176
 177         // paint
 178         double totalVisibleDistance = projectedPoint1
 179                 .getDistanceTo(projectedPoint2);
 180         totalVisibleDistance += projectedPoint1.getDistanceTo(projectedPoint3);
 181         totalVisibleDistance += projectedPoint2.getDistanceTo(projectedPoint3);
 182
 183         if (totalTextureDistance == -1)
 184             computeTotalTextureDistance();
 185         final double scaleFactor = (totalVisibleDistance / totalTextureDistance) * 1.2d;
 186
 187         final TextureBitmap zoomedBitmap = texture.getZoomedBitmap(scaleFactor);
 188
 189         is[0].setPoints(projectedPoint1, projectedPoint2, texturePoint1,
 190                 texturePoint2);
 191         is[1].setPoints(projectedPoint1, projectedPoint3, texturePoint1,
 192                 texturePoint3);
 193         is[2].setPoints(projectedPoint2, projectedPoint3, texturePoint2,
 194                 texturePoint3);
 195
 196         java.util.Arrays.sort(is);
 197
 198         for (int y = yTop; y < yBottom; y++)
 199             if (is[0].containsY(y)) {
 200
 201                 if (is[1].containsY(y))
 202                     drawHorizontalLine(is[0], is[1], y, renderBuffer,
 203                             zoomedBitmap);
 204                 else if (is[2].containsY(y))
 205                     drawHorizontalLine(is[0], is[2], y, renderBuffer,
 206                             zoomedBitmap);
 207             } else if (is[1].containsY(y))
 208                 if (is[2].containsY(y))
 209                     drawHorizontalLine(is[1], is[2], y, renderBuffer,
 210                             zoomedBitmap);
 211
 212     }
 213
 214     private void showBorders(final RenderingContext renderBuffer) {
 215
 216         final Point2D projectedPoint1 = coordinates[0].onScreenCoordinate;
 217         final Point2D projectedPoint2 = coordinates[1].onScreenCoordinate;
 218         final Point2D projectedPoint3 = coordinates[2].onScreenCoordinate;
 219
 220         renderBuffer.graphics.setColor(Color.YELLOW);
 221         renderBuffer.graphics.drawLine((int) projectedPoint1.x,
 222                 (int) projectedPoint1.y, (int) projectedPoint2.x,
 223                 (int) projectedPoint2.y);
 224         renderBuffer.graphics.drawLine((int) projectedPoint3.x,
 225                 (int) projectedPoint3.y, (int) projectedPoint2.x,
 226                 (int) projectedPoint2.y);
 227         renderBuffer.graphics.drawLine((int) projectedPoint1.x,
 228                 (int) projectedPoint1.y, (int) projectedPoint3.x,
 229                 (int) projectedPoint3.y);
 230     }
 231
 232 }