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

   1 /*
   2  * Sixth 3D engine. Copyright ©2012-2019, 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.gui.RenderingContext;
  15 import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.AbstractCoordinateShape;
  16 import eu.svjatoslav.sixth.e3d.renderer.raster.slicer.PolygonCoordinate;
  17 import eu.svjatoslav.sixth.e3d.renderer.raster.texture.Texture;
  18 import eu.svjatoslav.sixth.e3d.renderer.raster.texture.TextureBitmap;
  19
  20 import java.awt.*;
  21
  22 import static eu.svjatoslav.sixth.e3d.geometry.Polygon.pointWithinPolygon;
  23
  24 public class TexturedPolygon extends AbstractCoordinateShape {
  25
  26     public final Texture texture;
  27     final PolygonBorderInterpolator[] is = new PolygonBorderInterpolator[]{
  28             new PolygonBorderInterpolator(), new PolygonBorderInterpolator(),
  29             new PolygonBorderInterpolator()};
  30     /**
  31      * Polygon texture coordinates.
  32      */
  33     public Point2D texturePoint1, texturePoint2, texturePoint3;
  34     private boolean showBorders = false;
  35     private double totalTextureDistance = -1;
  36
  37     public TexturedPolygon(final Point3D p1, final Point3D p2,
  38                            final Point3D p3, final Point2D tp1, final Point2D tp2,
  39                            final Point2D tp3, final Texture texture) {
  40
  41         super(p1, p2, p3);
  42
  43         texturePoint1 = tp1;
  44         texturePoint2 = tp2;
  45         texturePoint3 = tp3;
  46
  47         this.texture = texture;
  48     }
  49
  50     public TexturedPolygon(final PolygonCoordinate pc1,
  51                            final PolygonCoordinate pc2, final PolygonCoordinate pc3,
  52                            final Texture texture) {
  53
  54         this(pc1.space, pc2.space, pc3.space, pc1.texture, pc2.texture,
  55                 pc3.texture, texture);
  56     }
  57
  58     private void computeTotalTextureDistance() {
  59         // compute total texture distance
  60         totalTextureDistance = texturePoint1.getDistanceTo(texturePoint2);
  61         totalTextureDistance += texturePoint1.getDistanceTo(texturePoint3);
  62         totalTextureDistance += texturePoint2.getDistanceTo(texturePoint3);
  63     }
  64
  65     private void drawHorizontalLine(final PolygonBorderInterpolator line1,
  66                                     final PolygonBorderInterpolator line2, final int y,
  67                                     final RenderingContext renderBuffer,
  68                                     final TextureBitmap textureBitmap) {
  69
  70         line1.setCurrentY(y);
  71         line2.setCurrentY(y);
  72
  73         int x1 = line1.getX();
  74         int x2 = line2.getX();
  75
  76         final double tx2, ty2;
  77         final double tx1, ty1;
  78
  79         if (x1 <= x2) {
  80
  81             tx1 = line1.getTX() * textureBitmap.multiplicationFactor;
  82             ty1 = line1.getTY() * textureBitmap.multiplicationFactor;
  83
  84             tx2 = line2.getTX() * textureBitmap.multiplicationFactor;
  85             ty2 = line2.getTY() * textureBitmap.multiplicationFactor;
  86
  87         } else {
  88             final int tmp = x1;
  89             x1 = x2;
  90             x2 = tmp;
  91
  92             tx1 = line2.getTX() * textureBitmap.multiplicationFactor;
  93             ty1 = line2.getTY() * textureBitmap.multiplicationFactor;
  94
  95             tx2 = line1.getTX() * textureBitmap.multiplicationFactor;
  96             ty2 = line1.getTY() * textureBitmap.multiplicationFactor;
  97         }
  98
  99         final double realWidth = x2 - x1;
 100         final double realX1 = x1;
 101
 102         if (x1 < 0)
 103             x1 = 0;
 104
 105         if (x2 >= renderBuffer.width)
 106             x2 = renderBuffer.width - 1;
 107
 108         int renderBufferOffset = ((y * renderBuffer.width) + x1) * 4;
 109         final byte[] renderBufferBytes = renderBuffer.pixels;
 110
 111         final double twidth = tx2 - tx1;
 112         final double theight = ty2 - ty1;
 113
 114         for (int x = x1; x < x2; x++) {
 115
 116             final double distance = x - realX1;
 117
 118             final double tx = tx1 + ((twidth * distance) / realWidth);
 119             final double ty = ty1 + ((theight * distance) / realWidth);
 120
 121             final int textureOffset = textureBitmap.getAddress((int) tx,
 122                     (int) ty);
 123
 124             textureBitmap.drawPixel(textureOffset, renderBufferBytes,
 125                     renderBufferOffset);
 126
 127             renderBufferOffset += 4;
 128         }
 129
 130     }
 131
 132     @Override
 133     public void paint(final RenderingContext renderBuffer) {
 134
 135         final Point2D projectedPoint1 = coordinates[0].onScreenCoordinate;
 136         final Point2D projectedPoint2 = coordinates[1].onScreenCoordinate;
 137         final Point2D projectedPoint3 = coordinates[2].onScreenCoordinate;
 138
 139         projectedPoint1.roundToInteger();
 140         projectedPoint2.roundToInteger();
 141         projectedPoint3.roundToInteger();
 142
 143         if (mouseInteractionController != null)
 144             if (renderBuffer.getMouseEvent() != null)
 145                 if (pointWithinPolygon(
 146                         renderBuffer.getMouseEvent().coordinate, projectedPoint1,
 147                         projectedPoint2, projectedPoint3))
 148                     renderBuffer.setObjectUnderMouse(mouseInteractionController);
 149
 150         // Show polygon boundaries (for debugging)
 151         if (showBorders)
 152             showBorders(renderBuffer);
 153
 154         // find top-most point
 155         int yTop = (int) projectedPoint1.y;
 156
 157         if (projectedPoint2.y < yTop)
 158             yTop = (int) projectedPoint2.y;
 159
 160         if (projectedPoint3.y < yTop)
 161             yTop = (int) projectedPoint3.y;
 162
 163         if (yTop < 0)
 164             yTop = 0;
 165
 166         // find bottom-most point
 167         int yBottom = (int) projectedPoint1.y;
 168
 169         if (projectedPoint2.y > yBottom)
 170             yBottom = (int) projectedPoint2.y;
 171
 172         if (projectedPoint3.y > yBottom)
 173             yBottom = (int) projectedPoint3.y;
 174
 175         if (yBottom >= renderBuffer.height)
 176             yBottom = renderBuffer.height - 1;
 177
 178         // paint
 179         double totalVisibleDistance = projectedPoint1
 180                 .getDistanceTo(projectedPoint2);
 181         totalVisibleDistance += projectedPoint1.getDistanceTo(projectedPoint3);
 182         totalVisibleDistance += projectedPoint2.getDistanceTo(projectedPoint3);
 183
 184         if (totalTextureDistance == -1)
 185             computeTotalTextureDistance();
 186         final double scaleFactor = (totalVisibleDistance / totalTextureDistance) * 1.2d;
 187
 188         final TextureBitmap zoomedBitmap = texture.getZoomedBitmap(scaleFactor);
 189
 190         is[0].setPoints(projectedPoint1, projectedPoint2, texturePoint1,
 191                 texturePoint2);
 192         is[1].setPoints(projectedPoint1, projectedPoint3, texturePoint1,
 193                 texturePoint3);
 194         is[2].setPoints(projectedPoint2, projectedPoint3, texturePoint2,
 195                 texturePoint3);
 196
 197         java.util.Arrays.sort(is);
 198
 199         for (int y = yTop; y < yBottom; y++)
 200             if (is[0].containsY(y)) {
 201
 202                 if (is[1].containsY(y))
 203                     drawHorizontalLine(is[0], is[1], y, renderBuffer,
 204                             zoomedBitmap);
 205                 else if (is[2].containsY(y))
 206                     drawHorizontalLine(is[0], is[2], y, renderBuffer,
 207                             zoomedBitmap);
 208             } else if (is[1].containsY(y))
 209                 if (is[2].containsY(y))
 210                     drawHorizontalLine(is[1], is[2], y, renderBuffer,
 211                             zoomedBitmap);
 212
 213     }
 214
 215     private void showBorders(final RenderingContext renderBuffer) {
 216
 217         final Point2D projectedPoint1 = coordinates[0].onScreenCoordinate;
 218         final Point2D projectedPoint2 = coordinates[1].onScreenCoordinate;
 219         final Point2D projectedPoint3 = coordinates[2].onScreenCoordinate;
 220
 221         renderBuffer.graphics.setColor(Color.YELLOW);
 222         renderBuffer.graphics.drawLine((int) projectedPoint1.x,
 223                 (int) projectedPoint1.y, (int) projectedPoint2.x,
 224                 (int) projectedPoint2.y);
 225         renderBuffer.graphics.drawLine((int) projectedPoint3.x,
 226                 (int) projectedPoint3.y, (int) projectedPoint2.x,
 227                 (int) projectedPoint2.y);
 228         renderBuffer.graphics.drawLine((int) projectedPoint1.x,
 229                 (int) projectedPoint1.y, (int) projectedPoint3.x,
 230                 (int) projectedPoint3.y);
 231     }
 232
 233 }