src/main/java/eu/svjatoslav/sixth/e3d/renderer/raster/shapes/basic/texturedpolygon/TexturedPolygon.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.basic.texturedpolygon;
   6
   7 import eu.svjatoslav.sixth.e3d.geometry.Point2D;
   8 import eu.svjatoslav.sixth.e3d.geometry.Point3D;
   9 import eu.svjatoslav.sixth.e3d.gui.RenderingContext;
  10 import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.AbstractCoordinateShape;
  11 import eu.svjatoslav.sixth.e3d.renderer.raster.slicer.PolygonCoordinate;
  12 import eu.svjatoslav.sixth.e3d.renderer.raster.texture.Texture;
  13 import eu.svjatoslav.sixth.e3d.renderer.raster.texture.TextureBitmap;
  14
  15 import java.awt.*;
  16
  17 import static eu.svjatoslav.sixth.e3d.geometry.Polygon.pointWithinPolygon;
  18
  19 public class TexturedPolygon extends AbstractCoordinateShape {
  20
  21     public final Texture texture;
  22     final PolygonBorderInterpolator[] is = new PolygonBorderInterpolator[]{
  23             new PolygonBorderInterpolator(), new PolygonBorderInterpolator(),
  24             new PolygonBorderInterpolator()};
  25     /**
  26      * Polygon texture coordinates.
  27      */
  28     public Point2D texturePoint1, texturePoint2, texturePoint3;
  29     private boolean showBorders = false;
  30     private double totalTextureDistance = -1;
  31
  32     public TexturedPolygon(final Point3D p1, final Point3D p2,
  33                            final Point3D p3, final Point2D tp1, final Point2D tp2,
  34                            final Point2D tp3, final Texture texture) {
  35
  36         super(p1, p2, p3);
  37
  38         texturePoint1 = tp1;
  39         texturePoint2 = tp2;
  40         texturePoint3 = tp3;
  41
  42         this.texture = texture;
  43     }
  44
  45     public TexturedPolygon(final PolygonCoordinate pc1,
  46                            final PolygonCoordinate pc2, final PolygonCoordinate pc3,
  47                            final Texture texture) {
  48
  49         this(pc1.space, pc2.space, pc3.space, pc1.texture, pc2.texture,
  50                 pc3.texture, texture);
  51     }
  52
  53     private void computeTotalTextureDistance() {
  54         // compute total texture distance
  55         totalTextureDistance = texturePoint1.getDistanceTo(texturePoint2);
  56         totalTextureDistance += texturePoint1.getDistanceTo(texturePoint3);
  57         totalTextureDistance += texturePoint2.getDistanceTo(texturePoint3);
  58     }
  59
  60     private void drawHorizontalLine(final PolygonBorderInterpolator line1,
  61                                     final PolygonBorderInterpolator line2, final int y,
  62                                     final RenderingContext renderBuffer,
  63                                     final TextureBitmap textureBitmap) {
  64
  65         line1.setCurrentY(y);
  66         line2.setCurrentY(y);
  67
  68         int x1 = line1.getX();
  69         int x2 = line2.getX();
  70
  71         final double tx2, ty2;
  72         final double tx1, ty1;
  73
  74         if (x1 <= x2) {
  75
  76             tx1 = line1.getTX() * textureBitmap.multiplicationFactor;
  77             ty1 = line1.getTY() * textureBitmap.multiplicationFactor;
  78
  79             tx2 = line2.getTX() * textureBitmap.multiplicationFactor;
  80             ty2 = line2.getTY() * textureBitmap.multiplicationFactor;
  81
  82         } else {
  83             final int tmp = x1;
  84             x1 = x2;
  85             x2 = tmp;
  86
  87             tx1 = line2.getTX() * textureBitmap.multiplicationFactor;
  88             ty1 = line2.getTY() * textureBitmap.multiplicationFactor;
  89
  90             tx2 = line1.getTX() * textureBitmap.multiplicationFactor;
  91             ty2 = line1.getTY() * textureBitmap.multiplicationFactor;
  92         }
  93
  94         final double realWidth = x2 - x1;
  95         final double realX1 = x1;
  96
  97         if (x1 < 0)
  98             x1 = 0;
  99
 100         if (x2 >= renderBuffer.width)
 101             x2 = renderBuffer.width - 1;
 102
 103         int renderBufferOffset = ((y * renderBuffer.width) + x1) * 4;
 104         final byte[] renderBufferBytes = renderBuffer.pixels;
 105
 106         final double twidth = tx2 - tx1;
 107         final double theight = ty2 - ty1;
 108
 109         for (int x = x1; x < x2; x++) {
 110
 111             final double distance = x - realX1;
 112
 113             final double tx = tx1 + ((twidth * distance) / realWidth);
 114             final double ty = ty1 + ((theight * distance) / realWidth);
 115
 116             final int textureOffset = textureBitmap.getAddress((int) tx,
 117                     (int) ty);
 118
 119             textureBitmap.drawPixel(textureOffset, renderBufferBytes,
 120                     renderBufferOffset);
 121
 122             renderBufferOffset += 4;
 123         }
 124
 125     }
 126
 127     @Override
 128     public void paint(final RenderingContext renderBuffer) {
 129
 130         final Point2D projectedPoint1 = coordinates[0].onScreenCoordinate;
 131         final Point2D projectedPoint2 = coordinates[1].onScreenCoordinate;
 132         final Point2D projectedPoint3 = coordinates[2].onScreenCoordinate;
 133
 134         projectedPoint1.roundToInteger();
 135         projectedPoint2.roundToInteger();
 136         projectedPoint3.roundToInteger();
 137
 138         if (mouseInteractionController != null)
 139             if (renderBuffer.getMouseEvent() != null)
 140                 if (pointWithinPolygon(
 141                         renderBuffer.getMouseEvent().coordinate, projectedPoint1,
 142                         projectedPoint2, projectedPoint3))
 143                     renderBuffer.setObjectUnderMouse(mouseInteractionController);
 144
 145         // Show polygon boundaries (for debugging)
 146         if (showBorders)
 147             showBorders(renderBuffer);
 148
 149         // find top-most point
 150         int yTop = (int) projectedPoint1.y;
 151
 152         if (projectedPoint2.y < yTop)
 153             yTop = (int) projectedPoint2.y;
 154
 155         if (projectedPoint3.y < yTop)
 156             yTop = (int) projectedPoint3.y;
 157
 158         if (yTop < 0)
 159             yTop = 0;
 160
 161         // find bottom-most point
 162         int yBottom = (int) projectedPoint1.y;
 163
 164         if (projectedPoint2.y > yBottom)
 165             yBottom = (int) projectedPoint2.y;
 166
 167         if (projectedPoint3.y > yBottom)
 168             yBottom = (int) projectedPoint3.y;
 169
 170         if (yBottom >= renderBuffer.height)
 171             yBottom = renderBuffer.height - 1;
 172
 173         // paint
 174         double totalVisibleDistance = projectedPoint1
 175                 .getDistanceTo(projectedPoint2);
 176         totalVisibleDistance += projectedPoint1.getDistanceTo(projectedPoint3);
 177         totalVisibleDistance += projectedPoint2.getDistanceTo(projectedPoint3);
 178
 179         if (totalTextureDistance == -1)
 180             computeTotalTextureDistance();
 181         final double scaleFactor = (totalVisibleDistance / totalTextureDistance) * 1.2d;
 182
 183         final TextureBitmap zoomedBitmap = texture.getZoomedBitmap(scaleFactor);
 184
 185         is[0].setPoints(projectedPoint1, projectedPoint2, texturePoint1,
 186                 texturePoint2);
 187         is[1].setPoints(projectedPoint1, projectedPoint3, texturePoint1,
 188                 texturePoint3);
 189         is[2].setPoints(projectedPoint2, projectedPoint3, texturePoint2,
 190                 texturePoint3);
 191
 192         java.util.Arrays.sort(is);
 193
 194         for (int y = yTop; y < yBottom; y++)
 195             if (is[0].containsY(y)) {
 196
 197                 if (is[1].containsY(y))
 198                     drawHorizontalLine(is[0], is[1], y, renderBuffer,
 199                             zoomedBitmap);
 200                 else if (is[2].containsY(y))
 201                     drawHorizontalLine(is[0], is[2], y, renderBuffer,
 202                             zoomedBitmap);
 203             } else if (is[1].containsY(y))
 204                 if (is[2].containsY(y))
 205                     drawHorizontalLine(is[1], is[2], y, renderBuffer,
 206                             zoomedBitmap);
 207
 208     }
 209
 210     private void showBorders(final RenderingContext renderBuffer) {
 211
 212         final Point2D projectedPoint1 = coordinates[0].onScreenCoordinate;
 213         final Point2D projectedPoint2 = coordinates[1].onScreenCoordinate;
 214         final Point2D projectedPoint3 = coordinates[2].onScreenCoordinate;
 215
 216         renderBuffer.graphics.setColor(Color.YELLOW);
 217         renderBuffer.graphics.drawLine((int) projectedPoint1.x,
 218                 (int) projectedPoint1.y, (int) projectedPoint2.x,
 219                 (int) projectedPoint2.y);
 220         renderBuffer.graphics.drawLine((int) projectedPoint3.x,
 221                 (int) projectedPoint3.y, (int) projectedPoint2.x,
 222                 (int) projectedPoint2.y);
 223         renderBuffer.graphics.drawLine((int) projectedPoint1.x,
 224                 (int) projectedPoint1.y, (int) projectedPoint3.x,
 225                 (int) projectedPoint3.y);
 226     }
 227
 228 }