2 * Sixth 3D engine. Copyright ©2012-2017, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
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.
10 package eu.svjatoslav.sixth.e3d.renderer.raster.shapes.basic.texturedpolygon;
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;
23 public class TexturedPolygon extends AbstractCoordinateShape {
25 public final Texture texture;
26 final PolygonBorderInterpolator[] is = new PolygonBorderInterpolator[]{
27 new PolygonBorderInterpolator(), new PolygonBorderInterpolator(),
28 new PolygonBorderInterpolator()};
30 * Polygon texture coordinates.
32 public Point2D texturePoint1, texturePoint2, texturePoint3;
33 private boolean showBorders = false;
34 private double totalTextureDistance = -1;
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) {
46 this.texture = texture;
49 public TexturedPolygon(final PolygonCoordinate pc1,
50 final PolygonCoordinate pc2, final PolygonCoordinate pc3,
51 final Texture texture) {
53 this(pc1.space, pc2.space, pc3.space, pc1.texture, pc2.texture,
54 pc3.texture, texture);
57 private void computeTotalTextureDistance() {
58 // compute total texture distance
59 totalTextureDistance = texturePoint1.getDistanceTo(texturePoint2);
60 totalTextureDistance += texturePoint1.getDistanceTo(texturePoint3);
61 totalTextureDistance += texturePoint2.getDistanceTo(texturePoint3);
64 private void drawHorizontalLine(final PolygonBorderInterpolator line1,
65 final PolygonBorderInterpolator line2, final int y,
66 final RenderingContext renderBuffer,
67 final TextureBitmap textureBitmap) {
72 int x1 = line1.getX();
73 int x2 = line2.getX();
75 final double tx2, ty2;
76 final double tx1, ty1;
80 tx1 = line1.getTX() * textureBitmap.multiplicationFactor;
81 ty1 = line1.getTY() * textureBitmap.multiplicationFactor;
83 tx2 = line2.getTX() * textureBitmap.multiplicationFactor;
84 ty2 = line2.getTY() * textureBitmap.multiplicationFactor;
91 tx1 = line2.getTX() * textureBitmap.multiplicationFactor;
92 ty1 = line2.getTY() * textureBitmap.multiplicationFactor;
94 tx2 = line1.getTX() * textureBitmap.multiplicationFactor;
95 ty2 = line1.getTY() * textureBitmap.multiplicationFactor;
98 final double realWidth = x2 - x1;
99 final double realX1 = x1;
104 if (x2 >= renderBuffer.width)
105 x2 = renderBuffer.width - 1;
107 int renderBufferOffset = ((y * renderBuffer.width) + x1) * 4;
108 final byte[] renderBufferBytes = renderBuffer.bytes;
110 final double twidth = tx2 - tx1;
111 final double theight = ty2 - ty1;
113 for (int x = x1; x < x2; x++) {
115 final double distance = x - realX1;
117 final double tx = tx1 + ((twidth * distance) / realWidth);
118 final double ty = ty1 + ((theight * distance) / realWidth);
120 final int textureOffset = textureBitmap.getAddress((int) tx,
123 textureBitmap.drawPixel(textureOffset, renderBufferBytes,
126 renderBufferOffset += 4;
132 public void paint(final RenderingContext renderBuffer) {
134 final Point2D projectedPoint1 = coordinates[0].onScreenCoordinate;
135 final Point2D projectedPoint2 = coordinates[1].onScreenCoordinate;
136 final Point2D projectedPoint3 = coordinates[2].onScreenCoordinate;
138 projectedPoint1.roundToInteger();
139 projectedPoint2.roundToInteger();
140 projectedPoint3.roundToInteger();
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;
149 // Show polygon boundaries (for debugging)
151 showBorders(renderBuffer);
153 // find top-most point
154 int yTop = (int) projectedPoint1.y;
156 if (projectedPoint2.y < yTop)
157 yTop = (int) projectedPoint2.y;
159 if (projectedPoint3.y < yTop)
160 yTop = (int) projectedPoint3.y;
165 // find bottom-most point
166 int yBottom = (int) projectedPoint1.y;
168 if (projectedPoint2.y > yBottom)
169 yBottom = (int) projectedPoint2.y;
171 if (projectedPoint3.y > yBottom)
172 yBottom = (int) projectedPoint3.y;
174 if (yBottom >= renderBuffer.height)
175 yBottom = renderBuffer.height - 1;
178 double totalVisibleDistance = projectedPoint1
179 .getDistanceTo(projectedPoint2);
180 totalVisibleDistance += projectedPoint1.getDistanceTo(projectedPoint3);
181 totalVisibleDistance += projectedPoint2.getDistanceTo(projectedPoint3);
183 if (totalTextureDistance == -1)
184 computeTotalTextureDistance();
185 final double scaleFactor = (totalVisibleDistance / totalTextureDistance) * 1.2d;
187 final TextureBitmap zoomedBitmap = texture.getZoomedBitmap(scaleFactor);
189 is[0].setPoints(projectedPoint1, projectedPoint2, texturePoint1,
191 is[1].setPoints(projectedPoint1, projectedPoint3, texturePoint1,
193 is[2].setPoints(projectedPoint2, projectedPoint3, texturePoint2,
196 java.util.Arrays.sort(is);
198 for (int y = yTop; y < yBottom; y++)
199 if (is[0].containsY(y)) {
201 if (is[1].containsY(y))
202 drawHorizontalLine(is[0], is[1], y, renderBuffer,
204 else if (is[2].containsY(y))
205 drawHorizontalLine(is[0], is[2], y, renderBuffer,
207 } else if (is[1].containsY(y))
208 if (is[2].containsY(y))
209 drawHorizontalLine(is[1], is[2], y, renderBuffer,
214 private void showBorders(final RenderingContext renderBuffer) {
216 final Point2D projectedPoint1 = coordinates[0].onScreenCoordinate;
217 final Point2D projectedPoint2 = coordinates[1].onScreenCoordinate;
218 final Point2D projectedPoint3 = coordinates[2].onScreenCoordinate;
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);