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Diffstat (limited to 'engine/src/core/com/jme3/scene/shape/Curve.java')
| -rw-r--r-- | engine/src/core/com/jme3/scene/shape/Curve.java | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/engine/src/core/com/jme3/scene/shape/Curve.java b/engine/src/core/com/jme3/scene/shape/Curve.java new file mode 100644 index 0000000..fbeda59 --- /dev/null +++ b/engine/src/core/com/jme3/scene/shape/Curve.java @@ -0,0 +1,271 @@ +/* + * Copyright (c) 2009-2010 jMonkeyEngine + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of 'jMonkeyEngine' nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +package com.jme3.scene.shape; + +import com.jme3.math.Spline; +import com.jme3.math.Vector3f; +import com.jme3.scene.Mesh; +import com.jme3.scene.VertexBuffer; +import java.util.Iterator; +import java.util.List; + +/** + * A <code>Curve</code> is a visual, line-based representation of a {@link Spline}. + * The underlying Spline will be sampled N times where N is the number of + * segments as specified in the constructor. Each segment will represent + * one line in the generated mesh. + * + * @author Nehon + */ +public class Curve extends Mesh { + + private Spline spline; + private Vector3f temp = new Vector3f(); + + /** + * Serialization only. Do not use. + */ + public Curve(){ + } + + /** + * Create a curve mesh. + * Use a CatmullRom spline model that does not cycle. + * + * @param controlPoints the control points to use to create this curve + * @param nbSubSegments the number of subsegments between the control points + */ + public Curve(Vector3f[] controlPoints, int nbSubSegments) { + this(new Spline(Spline.SplineType.CatmullRom, controlPoints, 10, false), nbSubSegments); + } + + /** + * Create a curve mesh from a Spline + * + * @param spline the spline to use + * @param nbSubSegments the number of subsegments between the control points + */ + public Curve(Spline spline, int nbSubSegments) { + super(); + this.spline = spline; + switch (spline.getType()) { + case CatmullRom: + this.createCatmullRomMesh(nbSubSegments); + break; + case Bezier: + this.createBezierMesh(nbSubSegments); + break; + case Nurb: + this.createNurbMesh(nbSubSegments); + break; + case Linear: + default: + this.createLinearMesh(); + break; + } + } + + private void createCatmullRomMesh(int nbSubSegments) { + float[] array = new float[((spline.getControlPoints().size() - 1) * nbSubSegments + 1) * 3]; + short[] indices = new short[(spline.getControlPoints().size() - 1) * nbSubSegments * 2]; + int i = 0; + int cptCP = 0; + for (Iterator<Vector3f> it = spline.getControlPoints().iterator(); it.hasNext();) { + Vector3f vector3f = it.next(); + array[i] = vector3f.x; + i++; + array[i] = vector3f.y; + i++; + array[i] = vector3f.z; + i++; + if (it.hasNext()) { + for (int j = 1; j < nbSubSegments; j++) { + spline.interpolate((float) j / nbSubSegments, cptCP, temp); + array[i] = temp.getX(); + i++; + array[i] = temp.getY(); + i++; + array[i] = temp.getZ(); + i++; + } + } + cptCP++; + } + + i = 0; + int k = 0; + for (int j = 0; j < (spline.getControlPoints().size() - 1) * nbSubSegments; j++) { + k = j; + indices[i] = (short) k; + i++; + k++; + indices[i] = (short) k; + i++; + } + + this.setMode(Mesh.Mode.Lines); + this.setBuffer(VertexBuffer.Type.Position, 3, array); + this.setBuffer(VertexBuffer.Type.Index, 2, indices);//(spline.getControlPoints().size() - 1) * nbSubSegments * 2 + this.updateBound(); + this.updateCounts(); + } + + /** + * This method creates the Bezier path for this curve. + * + * @param nbSubSegments + * amount of subsegments between position control points + */ + private void createBezierMesh(int nbSubSegments) { + if(nbSubSegments==0) { + nbSubSegments = 1; + } + int centerPointsAmount = (spline.getControlPoints().size() + 2) / 3; + + //calculating vertices + float[] array = new float[((centerPointsAmount - 1) * nbSubSegments + 1) * 3]; + int currentControlPoint = 0; + List<Vector3f> controlPoints = spline.getControlPoints(); + int lineIndex = 0; + for (int i = 0; i < centerPointsAmount - 1; ++i) { + Vector3f vector3f = controlPoints.get(currentControlPoint); + array[lineIndex++] = vector3f.x; + array[lineIndex++] = vector3f.y; + array[lineIndex++] = vector3f.z; + for (int j = 1; j < nbSubSegments; ++j) { + spline.interpolate((float) j / nbSubSegments, currentControlPoint, temp); + array[lineIndex++] = temp.getX(); + array[lineIndex++] = temp.getY(); + array[lineIndex++] = temp.getZ(); + } + currentControlPoint += 3; + } + Vector3f vector3f = controlPoints.get(currentControlPoint); + array[lineIndex++] = vector3f.x; + array[lineIndex++] = vector3f.y; + array[lineIndex++] = vector3f.z; + + //calculating indexes + int i = 0, k = 0; + short[] indices = new short[(centerPointsAmount - 1) * nbSubSegments << 1]; + for (int j = 0; j < (centerPointsAmount - 1) * nbSubSegments; ++j) { + k = j; + indices[i++] = (short) k; + ++k; + indices[i++] = (short) k; + } + + this.setMode(Mesh.Mode.Lines); + this.setBuffer(VertexBuffer.Type.Position, 3, array); + this.setBuffer(VertexBuffer.Type.Index, 2, indices); + this.updateBound(); + this.updateCounts(); + } + + /** + * This method creates the Nurb path for this curve. + * @param nbSubSegments + * amount of subsegments between position control points + */ + private void createNurbMesh(int nbSubSegments) { + float minKnot = spline.getMinNurbKnot(); + float maxKnot = spline.getMaxNurbKnot(); + float deltaU = (maxKnot - minKnot)/nbSubSegments; + + float[] array = new float[(nbSubSegments + 1) * 3]; + + float u = minKnot; + Vector3f interpolationResult = new Vector3f(); + for(int i=0;i<array.length;i+=3) { + spline.interpolate(u, 0, interpolationResult); + array[i] = interpolationResult.x; + array[i + 1] = interpolationResult.y; + array[i + 2] = interpolationResult.z; + u += deltaU; + } + + //calculating indexes + int i = 0; + short[] indices = new short[nbSubSegments << 1]; + for (int j = 0; j < nbSubSegments; ++j) { + indices[i++] = (short) j; + indices[i++] = (short) (j + 1); + } + + this.setMode(Mesh.Mode.Lines); + this.setBuffer(VertexBuffer.Type.Position, 3, array); + this.setBuffer(VertexBuffer.Type.Index, 2, indices); + this.updateBound(); + this.updateCounts(); + } + + private void createLinearMesh() { + float[] array = new float[spline.getControlPoints().size() * 3]; + short[] indices = new short[(spline.getControlPoints().size() - 1) * 2]; + int i = 0; + int cpt = 0; + int k = 0; + int j = 0; + for (Iterator<Vector3f> it = spline.getControlPoints().iterator(); it.hasNext();) { + Vector3f vector3f = it.next(); + array[i] = vector3f.getX(); + i++; + array[i] = vector3f.getY(); + i++; + array[i] = vector3f.getZ(); + i++; + if (it.hasNext()) { + k = j; + indices[cpt] = (short) k; + cpt++; + k++; + indices[cpt] = (short) k; + cpt++; + j++; + } + } + + this.setMode(Mesh.Mode.Lines); + this.setBuffer(VertexBuffer.Type.Position, 3, array); + this.setBuffer(VertexBuffer.Type.Index, 2, indices); + this.updateBound(); + this.updateCounts(); + } + + /** + * This method returns the length of the curve. + * @return the length of the curve + */ + public float getLength() { + return spline.getTotalLength(); + } +} |