X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fthreedee%2FTerrainHelper.java;fp=src%2Ftim%2Fprune%2Fthreedee%2FTerrainHelper.java;h=ffe9db888d1ea443ebf1f488d9d4e0e0cc9d9106;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/threedee/TerrainHelper.java b/src/tim/prune/threedee/TerrainHelper.java
new file mode 100644
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+++ b/src/tim/prune/threedee/TerrainHelper.java
@@ -0,0 +1,477 @@
+package tim.prune.threedee;
+
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
+import javax.vecmath.Point3d;
+import javax.vecmath.TexCoord2f;
+
+import tim.prune.data.Altitude;
+import tim.prune.data.Coordinate;
+import tim.prune.data.DataPoint;
+import tim.prune.data.DoubleRange;
+import tim.prune.data.Field;
+import tim.prune.data.FieldList;
+import tim.prune.data.Latitude;
+import tim.prune.data.Longitude;
+import tim.prune.data.Track;
+import tim.prune.data.TrackExtents;
+import tim.prune.data.UnitSetLibrary;
+import tim.prune.gui.map.MapUtils;
+
+/**
+ * Helper for generating the arrays needed for the 3d terrain
+ */
+public class TerrainHelper
+{
+	/** Number of nodes on each side of the square grid */
+	private int _gridSize = 0;
+
+	/**
+	 * Constructor
+	 * @param inGridSize grid size
+	 */
+	public TerrainHelper(int inGridSize) {
+		_gridSize = inGridSize;
+	}
+
+	/**
+	 * @return grid size
+	 */
+	public int getGridSize() {
+		return _gridSize;
+	}
+
+
+	/**
+	 * Convert the terrain coordinates from raw form to TriangleStripArray form
+	 * (with repeated nodes)
+	 * @param inRawPoints array of raw points as formed from the track
+	 * @return point coordinates as array
+	 */
+	public Point3d[] getTerrainCoordinates(Point3d[] inRawPoints)
+	{
+		final int numNodes = _gridSize * _gridSize;
+		if (_gridSize <= 1 || inRawPoints == null || inRawPoints.length != numNodes) {return null;}
+		// Put these nodes into a new result array (repeating nodes as necessary)
+		final int resultSize = _gridSize * (_gridSize * 2 - 2);
+		Point3d[] result = new Point3d[resultSize];
+		final int numStrips = _gridSize - 1;
+		int resultIndex = 0;
+		for (int strip=0; strip<numStrips; strip++)
+		{
+			for (int col=0; col<_gridSize; col++)
+			{
+				int bottomNodeIndex = strip * _gridSize + col;
+				int topNodeIndex = bottomNodeIndex + _gridSize;
+				result[resultIndex++] = inRawPoints[bottomNodeIndex];
+				result[resultIndex++] = inRawPoints[topNodeIndex];
+			}
+		}
+		return result;
+	}
+
+
+	/**
+	 * Get the texture coordinates as an array
+	 * @return texture coordinates as array
+	 */
+	public TexCoord2f[] getTextureCoordinates()
+	{
+		if (_gridSize <= 1) {return null;}
+		final int numNodes = _gridSize * _gridSize;
+		final float gridStep = 1.0f / (_gridSize - 1);
+		// Build all the required nodes
+		TexCoord2f[] nodes = new TexCoord2f[numNodes];
+		for (int i=0; i<_gridSize; i++)
+		{
+			for (int j=0; j<_gridSize; j++)
+			{
+				nodes[j * _gridSize + i] = new TexCoord2f(gridStep * i, 1.0f - gridStep * j);
+			}
+		}
+		// Now put these nodes into a new result array (repeating nodes as necessary)
+		final int resultSize = _gridSize * (_gridSize * 2 - 2);
+		TexCoord2f[] result = new TexCoord2f[resultSize];
+		final int numStrips = _gridSize - 1;
+		int resultIndex = 0;
+		for (int strip=0; strip<numStrips; strip++)
+		{
+			for (int col=0; col<_gridSize; col++)
+			{
+				int bottomNodeIndex = strip * _gridSize + col;
+				int topNodeIndex = bottomNodeIndex + _gridSize;
+				result[resultIndex++] = nodes[bottomNodeIndex];
+				result[resultIndex++] = nodes[topNodeIndex];
+			}
+		}
+		return result;
+	}
+
+	/**
+	 * @return strip lengths as array
+	 */
+	public int[] getStripLengths()
+	{
+		final int numStrips = _gridSize - 1;
+		final int nodesPerStrip = _gridSize * 2;
+		int[] result = new int[numStrips];
+		for (int i=0; i<numStrips; i++) {
+			result[i] = nodesPerStrip;
+		}
+		return result;
+	}
+
+	/**
+	 * Create a grid of points in a new Track
+	 * @param inDataTrack track from which the extents should be obtained
+	 * @return Track containing all the points in the grid
+	 */
+	public Track createGridTrack(Track inDataTrack)
+	{
+		// Work out the size of the current track
+		TrackExtents extents = new TrackExtents(inDataTrack);
+		extents.applySquareBorder();
+		DoubleRange xRange = extents.getXRange();
+		DoubleRange yRange = extents.getYRange();
+		// Create the array of points
+		final int numPoints = _gridSize * _gridSize;
+		final double xStep = xRange.getRange() / (_gridSize - 1);
+		final double yStep = yRange.getRange() / (_gridSize - 1);
+		DataPoint[] points = new DataPoint[numPoints];
+		for (int i=0; i<_gridSize; i++)
+		{
+			double pY = yRange.getMinimum() + i * yStep;
+			for (int j=0; j<_gridSize; j++)
+			{
+				// Create a new point with the appropriate lat and long, with no altitude
+				double pX = xRange.getMinimum() + j * xStep;
+				DataPoint point = new DataPoint(
+					new Latitude(MapUtils.getLatitudeFromY(pY), Coordinate.FORMAT_DECIMAL_FORCE_POINT),
+					new Longitude(MapUtils.getLongitudeFromX(pX), Coordinate.FORMAT_DECIMAL_FORCE_POINT),
+					null);
+				//System.out.println("Created point at " + point.getLatitude().output(Coordinate.FORMAT_DEG_MIN_SEC)
+				//	+ ", " + point.getLongitude().output(Coordinate.FORMAT_DEG_MIN_SEC));
+				points[i * _gridSize + j] = point;
+			}
+		}
+		// Put these into a new track
+		Field[] fields = {Field.LATITUDE, Field.LONGITUDE, Field.ALTITUDE};
+		Track grid = new Track(new FieldList(fields), points);
+		return grid;
+	}
+
+	/**
+	 * Write the given terrain track out to an indexed png file
+	 * @param inModel three-d data model with terrain
+	 * @param inPngFile file to write to
+	 */
+	public void writeHeightMap(ThreeDModel inModel, File inPngFile)
+	{
+		BufferedImage image = new BufferedImage(_gridSize, _gridSize, BufferedImage.TYPE_BYTE_INDEXED);
+		for (int y=0; y<_gridSize; y++)
+		{
+			for (int x=0; x<_gridSize; x++)
+			{
+				double heightValue = inModel.getScaledTerrainValue(y * _gridSize + x) * 256;
+				// Need to ask colour model what rgb to use for this index (a little round-the-houses)
+				image.setRGB(x, y, image.getColorModel().getRGB((int) heightValue));
+			}
+		}
+		try
+		{
+			ImageIO.write(image, "PNG", inPngFile);
+		}
+		catch (IOException ioe) {System.err.println(ioe.getClass().getName() + " - " + ioe.getMessage());}
+	}
+
+
+	/**
+	 * Try to fix the voids in the given terrain track by averaging neighbour values where possible
+	 * @param inTerrainTrack terrain track to fix
+	 */
+	public void fixVoids(Track inTerrainTrack)
+	{
+		int numVoids = countVoids(inTerrainTrack);
+		if (numVoids == 0) {return;}
+		//System.out.println("Starting to fix, num voids = " + numVoids);
+		// Fix the holes which are surrounded on all four sides by non-holes
+		fixSingleHoles(inTerrainTrack);
+		//System.out.println("Fixed single holes, now num voids = " + countVoids(inTerrainTrack));
+		// Maybe there is something to do in the corners?
+		fixCornersAndEdges(inTerrainTrack);
+		//System.out.println("Fixed corners, now num voids = " + countVoids(inTerrainTrack));
+		// Now fix the bigger holes, which should fix everything left
+		fixBiggerHoles(inTerrainTrack);
+		final int numHolesLeft = countVoids(inTerrainTrack);
+		if (numHolesLeft > 0) {
+			System.out.println("Fixed bigger holes, now num voids = " + countVoids(inTerrainTrack));
+		}
+	}
+
+	/**
+	 * @param inTerrainTrack terrain track
+	 * @return number of voids (points without altitudes)
+	 */
+	private static int countVoids(Track inTerrainTrack)
+	{
+		// DEBUG: Show state of voids first
+//		final int gridSize = (int) Math.sqrt(inTerrainTrack.getNumPoints());
+//		StringBuilder sb = new StringBuilder();
+//		for (int i=0; i<inTerrainTrack.getNumPoints(); i++)
+//		{
+//			if ((i%gridSize) == 0) sb.append('\n');
+//			if (inTerrainTrack.getPoint(i).hasAltitude()) {
+//				sb.append('A');
+//			} else {
+//				sb.append(' ');
+//			}
+//		}
+//		System.out.println("Voids:" + sb.toString());
+		// END DEBUG
+
+		int numVoids = 0;
+		if (inTerrainTrack != null)
+		{
+			for (int i=0; i<inTerrainTrack.getNumPoints(); i++) {
+				if (!inTerrainTrack.getPoint(i).hasAltitude()) {
+					numVoids++;
+				}
+			}
+		}
+		return numVoids;
+	}
+
+	/**
+	 * Just deal with single holes surrounded by at least four direct neighbours
+	 * @param inTerrainTrack terrain track to fix
+	 */
+	private void fixSingleHoles(Track inTerrainTrack)
+	{
+		// Holes with neighbours in all directions
+		final int startIndex = 1, endIndex = _gridSize - 2;
+		for (int x = startIndex; x <= endIndex; x++)
+		{
+			for (int y = startIndex; y <= endIndex; y++)
+			{
+				int pIndex = x * _gridSize + y;
+				// Get the point and its neighbours
+				final DataPoint p = inTerrainTrack.getPoint(pIndex);
+				if (!p.hasAltitude())
+				{
+					final DataPoint pl = inTerrainTrack.getPoint(pIndex - 1);
+					final DataPoint pr = inTerrainTrack.getPoint(pIndex + 1);
+					final DataPoint pu = inTerrainTrack.getPoint(pIndex + _gridSize);
+					final DataPoint pd = inTerrainTrack.getPoint(pIndex - _gridSize);
+					// Check if the points are null??
+					if (pl == null || pr == null || pu == null || pd == null)
+					{
+						System.err.println("Woah. Got a null point in fixSingleHoles. x=" + x + ", y=" + y + ", grid=" + _gridSize);
+						System.err.println("index=" + pIndex);
+						if (pl == null) System.err.println("pl is null");
+						if (pr == null) System.err.println("pr is null");
+						if (pu == null) System.err.println("pu is null");
+						if (pd == null) System.err.println("pd is null");
+						continue;
+					}
+					// Check that all the neighbours have altitudes
+					if (pl.hasAltitude() && pr.hasAltitude() && pu.hasAltitude() && pd.hasAltitude())
+					{
+						// Now check the double-neighbours
+						final DataPoint pll = inTerrainTrack.getPoint(pIndex - 2);
+						final DataPoint prr = inTerrainTrack.getPoint(pIndex + 2);
+						final DataPoint puu = inTerrainTrack.getPoint(pIndex + 2 * _gridSize);
+						final DataPoint pdd = inTerrainTrack.getPoint(pIndex - 2 * _gridSize);
+
+						double altitude = 0.0;
+						if (pll != null && pll.hasAltitude() && prr != null && prr.hasAltitude()
+							&& puu != null && puu.hasAltitude() && pdd != null && pdd.hasAltitude())
+						{
+							// Use the double-neighbours too to take into account the gradients
+							altitude = (
+								  pl.getAltitude().getMetricValue() * 1.5
+								- pll.getAltitude().getMetricValue() * 0.5
+								+ pr.getAltitude().getMetricValue() * 1.5
+								- prr.getAltitude().getMetricValue() * 0.5
+								+ pd.getAltitude().getMetricValue() * 1.5
+								- pdd.getAltitude().getMetricValue() * 0.5
+								+ pu.getAltitude().getMetricValue() * 1.5
+								- puu.getAltitude().getMetricValue() * 0.5) / 4.0;
+						}
+						else
+						{
+							// no double-neighbours, just use neighbours
+							altitude = (
+								  pl.getAltitude().getMetricValue()
+								+ pr.getAltitude().getMetricValue()
+								+ pd.getAltitude().getMetricValue()
+								+ pu.getAltitude().getMetricValue()) / 4.0;
+						}
+						// Set this altitude in the point
+						p.setFieldValue(Field.ALTITUDE, "" + altitude, false);
+						// force value to metres
+						p.getAltitude().reset(new Altitude((int) altitude, UnitSetLibrary.UNITS_METRES));
+					}
+				}
+			}
+		}
+	}
+
+	/**
+	 * Try to fix the corners and edges, if they're blank
+	 * @param inTerrainTrack terrain track
+	 */
+	private void fixCornersAndEdges(Track inTerrainTrack)
+	{
+		fixCorner(inTerrainTrack, 0, 1, 1);
+		fixCorner(inTerrainTrack, _gridSize-1, -1, 1);
+		fixCorner(inTerrainTrack, (_gridSize-1)*_gridSize, 1, -1);
+		fixCorner(inTerrainTrack, _gridSize*_gridSize-1, -1, -1);
+		fixEdge(inTerrainTrack, 0, 1);
+		fixEdge(inTerrainTrack, _gridSize-1, _gridSize);
+		fixEdge(inTerrainTrack, (_gridSize-1)*_gridSize, -_gridSize);
+		fixEdge(inTerrainTrack, _gridSize*_gridSize-1, -1);
+	}
+
+	/**
+	 * Fix a single corner by searching along adjacent edges and averaging the nearest neighbours
+	 * @param inTerrainTrack terrain track
+	 * @param inCornerIndex index of corner to fill
+	 * @param inXinc increment in x direction (+1 or -1)
+	 * @param inYinc increment in y direction (+1 or -1)
+	 */
+	private void fixCorner(Track inTerrainTrack, int inCornerIndex, int inXinc, int inYinc)
+	{
+		DataPoint corner = inTerrainTrack.getPoint(inCornerIndex);
+		if (corner == null || corner.hasAltitude()) {return;}
+		// Corner hasn't got an altitude, we'll have to look for it
+		int sIndex1 = inCornerIndex, sIndex2 = inCornerIndex;
+		Altitude alt1 = null, alt2 = null;
+
+		for (int i=1; i<_gridSize && !corner.hasAltitude(); i++)
+		{
+			sIndex1 += inXinc;
+			sIndex2 += (inYinc * _gridSize);
+			// System.out.println("To fill corner " + inCornerIndex + ", looking at indexes " + sIndex1 + " and " + sIndex2);
+			if (alt1 == null)
+			{
+				DataPoint source1 = inTerrainTrack.getPoint(sIndex1);
+				if (source1 != null && source1.hasAltitude()) {alt1 = source1.getAltitude();}
+			}
+			if (alt2 == null)
+			{
+				DataPoint source2 = inTerrainTrack.getPoint(sIndex2);
+				if (source2 != null && source2.hasAltitude()) {alt2 = source2.getAltitude();}
+			}
+			// Can we average these?
+			if (alt1 != null && alt2 != null)
+			{
+				// System.out.println("Averaging values " + alt1.getMetricValue() + " and " + alt2.getMetricValue());
+				int newAltitude = (int) ((alt1.getMetricValue() + alt2.getMetricValue()) / 2.0);
+				corner.setFieldValue(Field.ALTITUDE, "" + newAltitude, false);
+				// TODO: Check forcing metres?  Is there a nicer way?
+			}
+		}
+	}
+
+	/**
+	 * Fix any holes found in the specified edge
+	 * @param inTerrainTrack terrain track
+	 * @param inCornerIndex index of corner to start from
+	 * @param inInc increment along edge
+	 */
+	private void fixEdge(Track inTerrainTrack, int inCornerIndex, int inInc)
+	{
+		int prevIndexWithAlt = -1;
+		int sIndex = inCornerIndex;
+		if (inTerrainTrack.getPoint(sIndex).hasAltitude()) {prevIndexWithAlt = 0;}
+		for (int i=1; i<_gridSize; i++)
+		{
+			sIndex += inInc;
+			if (inTerrainTrack.getPoint(sIndex).hasAltitude())
+			{
+				if (prevIndexWithAlt >= 0 && prevIndexWithAlt < (i-1))
+				{
+					final int gapLen = i - prevIndexWithAlt;
+					final int cellIndex1 = inCornerIndex + prevIndexWithAlt * inInc;
+					final double alt1 = inTerrainTrack.getPoint(cellIndex1).getAltitude().getMetricValue();
+					final int cellIndex2 = inCornerIndex + i * inInc;
+					final double alt2 = inTerrainTrack.getPoint(cellIndex2).getAltitude().getMetricValue();
+					//System.out.println("Altitude along edge goes from " + alt1 + " (at " + prevIndexWithAlt + ") to " +
+					//		alt2 + " (at " + i + ")");
+					for (int j = 1; j < gapLen; j++)
+					{
+						final double alt = alt1 + (alt2-alt1) * j / gapLen;
+						//System.out.println("Fill in " + (prevIndexWithAlt + j) + "(" + (inCornerIndex + (prevIndexWithAlt + j) * inInc) + ")  with alt " + (int) alt);
+						final DataPoint p = inTerrainTrack.getPoint(inCornerIndex + (prevIndexWithAlt + j) * inInc);
+						p.setFieldValue(Field.ALTITUDE, "" + (int) alt, false);
+						// TODO: Check forcing metres?
+					}
+				}
+				prevIndexWithAlt = i;
+			}
+		}
+	}
+
+	/**
+	 * Try to fix bigger holes by interpolating between neighbours
+	 * @param inTerrainTrack terrain track
+	 */
+	private void fixBiggerHoles(Track inTerrainTrack)
+	{
+		TerrainPatch patch = new TerrainPatch(_gridSize);
+		for (int i=0; i<_gridSize; i++)
+		{
+			int prevHoriz = -1, prevVert = -1;
+			for (int j=0; j<_gridSize; j++)
+			{
+				if (inTerrainTrack.getPoint(i * _gridSize + j).hasAltitude())
+				{
+					if (prevHoriz > -1 && prevHoriz != (j-1))
+					{
+						//System.out.println("Found a gap for y=" + i +" between x=" + prevHoriz + " and " + j + " (" + (j-prevHoriz-1) + ")");
+						double startVal = inTerrainTrack.getPoint(i * _gridSize + prevHoriz).getAltitude().getMetricValue();
+						double endVal   = inTerrainTrack.getPoint(i * _gridSize + j).getAltitude().getMetricValue();
+						for (int k=prevHoriz + 1; k< j; k++)
+						{
+							double val = startVal + (k-prevHoriz) * (endVal-startVal) / (j-prevHoriz);
+							patch.addAltitude(i * _gridSize + k, val, k-prevHoriz, j-prevHoriz);
+						}
+					}
+					prevHoriz = j;
+				}
+				if (inTerrainTrack.getPoint(j * _gridSize + i).hasAltitude())
+				{
+					if (prevVert > -1 && prevVert != (j-1))
+					{
+						//System.out.println("Found a gap for x=" + i +" between y=" + prevVert + " and " + j + " (" + (j-prevVert-1) + ")");
+						double startVal = inTerrainTrack.getPoint(prevVert * _gridSize + i).getAltitude().getMetricValue();
+						double endVal   = inTerrainTrack.getPoint(j * _gridSize + i).getAltitude().getMetricValue();
+						for (int k=prevVert + 1; k< j; k++)
+						{
+							double val = startVal + (k-prevVert) * (endVal-startVal) / (j-prevVert);
+							patch.addAltitude(k * _gridSize + i, val, k-prevVert, j-prevVert);
+						}
+					}
+					prevVert = j;
+				}
+			}
+		}
+		// Smooth the patch to reduce the blocky effect from the voids
+		patch.smooth();
+
+		// Now the doubles have been set and averaged, we can set the values in the points
+		for (int i=0; i<inTerrainTrack.getNumPoints(); i++)
+		{
+			DataPoint p = inTerrainTrack.getPoint(i);
+			if (!p.hasAltitude())
+			{
+				final double altitude = patch.getAltitude(i);
+				p.setFieldValue(Field.ALTITUDE, "" + altitude, false);
+				p.getAltitude().reset(new Altitude((int) altitude, UnitSetLibrary.UNITS_METRES));
+			}
+		}
+	}
+}