trianglestriparrayretained.java

JAVA3D矩陈的相关类

/*
 * $RCSfile: TriangleStripArrayRetained.java,v $
 *
 * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
 *
 * Use is subject to license terms.
 *
 * $Revision: 1.7 $
 * $Date: 2007/02/09 17:18:29 $
 * $State: Exp $
 */

package javax.media.j3d;

import javax.vecmath.*;
import java.lang.Math;

/**
 * The TriangleStripArray object draws an array of vertices as a set of
 * connected triangle strips.  An array of per-strip vertex counts specifies
 * where the separate strips appear in the vertex array.
 * For every strip in the set,
 * each vertex, beginning with the third vertex in the array,
 * defines a triangle to be drawn using the current vertex and
 * the two previous vertices.
 */

class TriangleStripArrayRetained extends GeometryStripArrayRetained {

    TriangleStripArrayRetained() {
	this.geoType = GEO_TYPE_TRI_STRIP_SET;
    }
    
    boolean intersect(PickShape pickShape, PickInfo pickInfo, int flags, Point3d iPnt,
                      GeometryRetained geom, int geomIndex) {
	Point3d pnts[] = new Point3d[3];
	double sdist[] = new double[1];
	double minDist = Double.MAX_VALUE;
	double x = 0, y = 0, z = 0;
	int i = 0;
	int j, end;
	pnts[0] = new Point3d();
	pnts[1] = new Point3d();
	pnts[2] = new Point3d();
        int[] vtxIndexArr = new int[3];

	switch (pickShape.getPickType()) {
	case PickShape.PICKRAY:
	    PickRay pickRay= (PickRay) pickShape;
	
	    while (i < stripVertexCounts.length) {  
		j = stripStartVertexIndices[i];
		end = j + stripVertexCounts[i++];
                for(int k=0; k<2; k++) {
                    vtxIndexArr[k] = j;
                    getVertexData(j++, pnts[k]);
                }
		while (j < end) {
                    vtxIndexArr[2] = j;
                    getVertexData(j++, pnts[2]);          
		    if (intersectRay(pnts, pickRay, sdist, iPnt)) {
			if (flags == 0) {
			    return true;
			}
			if (sdist[0] < minDist) {
			    minDist = sdist[0];
			    x = iPnt.x;
			    y = iPnt.y;
			    z = iPnt.z;
                            if((flags & PickInfo.CLOSEST_GEOM_INFO) != 0) {
                                storeInterestData(pickInfo, flags, geom, geomIndex, 
                                                  vtxIndexArr, iPnt, sdist[0]);
                            }
                        }
                        if((flags & PickInfo.ALL_GEOM_INFO) != 0) {
                            storeInterestData(pickInfo, flags, geom, geomIndex, 
                                              vtxIndexArr, iPnt, sdist[0]);                      
       		        }
                    }
		    pnts[0].set(pnts[1]);
                    vtxIndexArr[0] = vtxIndexArr[1];
		    pnts[1].set(pnts[2]);
                    vtxIndexArr[1] = vtxIndexArr[2];
		}
	    }
	    break;
	case PickShape.PICKSEGMENT:
	    PickSegment pickSegment = (PickSegment) pickShape;

	    while (i < stripVertexCounts.length) {  
		j = stripStartVertexIndices[i];
		end = j + stripVertexCounts[i++];
                for(int k=0; k<2; k++) {
                    vtxIndexArr[k] = j;
                    getVertexData(j++, pnts[k]);
                }
		while (j < end) {
                    vtxIndexArr[2] = j;
		    getVertexData(j++, pnts[2]);
		    if (intersectSegment(pnts, pickSegment.start, 
					 pickSegment.end, sdist, iPnt)) {
			if (flags == 0) {
			    return true;
			}
			if (sdist[0] < minDist) {
			    minDist = sdist[0];
			    x = iPnt.x;
			    y = iPnt.y;
			    z = iPnt.z;
                            if((flags & PickInfo.CLOSEST_GEOM_INFO) != 0) {
                                storeInterestData(pickInfo, flags, geom, geomIndex, 
                                                  vtxIndexArr, iPnt, sdist[0]);
                            }
                        }
                        if((flags & PickInfo.ALL_GEOM_INFO) != 0) {
                            storeInterestData(pickInfo, flags, geom, geomIndex, 
                                              vtxIndexArr, iPnt, sdist[0]);                      
       		        }
                    }
		    pnts[0].set(pnts[1]);
                    vtxIndexArr[0] = vtxIndexArr[1];
		    pnts[1].set(pnts[2]);
                    vtxIndexArr[1] = vtxIndexArr[2];
		}
	    }
	    break;
	case PickShape.PICKBOUNDINGBOX:
	    BoundingBox bbox = (BoundingBox) 
		((PickBounds) pickShape).bounds;

	    while (i < stripVertexCounts.length) {  
		j = stripStartVertexIndices[i];
		end = j + stripVertexCounts[i++];
                for(int k=0; k<2; k++) {
                    vtxIndexArr[k] = j;
                    getVertexData(j++, pnts[k]);
                }
		while (j < end) {
                    vtxIndexArr[2] = j;
		    getVertexData(j++, pnts[2]);
		    if (intersectBoundingBox(pnts, bbox, sdist, iPnt)) {
			if (flags == 0) {
			    return true;
			}
			if (sdist[0] < minDist) {
			    minDist = sdist[0];
			    x = iPnt.x;
			    y = iPnt.y;
			    z = iPnt.z;
                            if((flags & PickInfo.CLOSEST_GEOM_INFO) != 0) {
                                storeInterestData(pickInfo, flags, geom, geomIndex, 
                                                  vtxIndexArr, iPnt, sdist[0]);
                            }
                        }
                        if((flags & PickInfo.ALL_GEOM_INFO) != 0) {
                            storeInterestData(pickInfo, flags, geom, geomIndex, 
                                              vtxIndexArr, iPnt, sdist[0]);                      
       		        }
                    }
		    pnts[0].set(pnts[1]);
                    vtxIndexArr[0] = vtxIndexArr[1];
		    pnts[1].set(pnts[2]);
                    vtxIndexArr[1] = vtxIndexArr[2];
		}
	    }
	    break;
	case PickShape.PICKBOUNDINGSPHERE:
	    BoundingSphere bsphere = (BoundingSphere) 
		                     ((PickBounds) pickShape).bounds;

	    while (i < stripVertexCounts.length) {  
		j = stripStartVertexIndices[i];
		end = j + stripVertexCounts[i++];
                for(int k=0; k<2; k++) {
                    vtxIndexArr[k] = j;
                    getVertexData(j++, pnts[k]);
                }
		while (j < end) {
                    vtxIndexArr[2] = j;
		    getVertexData(j++, pnts[2]);
		    if (intersectBoundingSphere(pnts, bsphere, sdist,
						iPnt)) { 
			if (flags == 0) {
			    return true;
			}
			if (sdist[0] < minDist) {
			    minDist = sdist[0];
			    x = iPnt.x;
			    y = iPnt.y;
			    z = iPnt.z;
                            if((flags & PickInfo.CLOSEST_GEOM_INFO) != 0) {
                                storeInterestData(pickInfo, flags, geom, geomIndex, 
                                                  vtxIndexArr, iPnt, sdist[0]);
                            }
                        }
                        if((flags & PickInfo.ALL_GEOM_INFO) != 0) {
                            storeInterestData(pickInfo, flags, geom, geomIndex, 
                                              vtxIndexArr, iPnt, sdist[0]);                      
       		        }
                    }
		    pnts[0].set(pnts[1]);
                    vtxIndexArr[0] = vtxIndexArr[1];
		    pnts[1].set(pnts[2]);
                    vtxIndexArr[1] = vtxIndexArr[2];
		}
	    }
	    break;
	case PickShape.PICKBOUNDINGPOLYTOPE:
	    BoundingPolytope bpolytope = (BoundingPolytope) 
		((PickBounds) pickShape).bounds;

	    while (i < stripVertexCounts.length) {  
		j = stripStartVertexIndices[i];
		end = j + stripVertexCounts[i++];
                for(int k=0; k<2; k++) {
                    vtxIndexArr[k] = j;
                    getVertexData(j++, pnts[k]);
                }
		while (j < end) {
                    vtxIndexArr[2] = j;
		    getVertexData(j++, pnts[2]);
                    if (intersectBoundingPolytope(pnts, bpolytope,
						  sdist, iPnt)) {
			if (flags == 0) {
			    return true;
			}
			if (sdist[0] < minDist) {
			    minDist = sdist[0];
			    x = iPnt.x;
			    y = iPnt.y;
			    z = iPnt.z;
                            if((flags & PickInfo.CLOSEST_GEOM_INFO) != 0) {
                                storeInterestData(pickInfo, flags, geom, geomIndex, 
                                                  vtxIndexArr, iPnt, sdist[0]);
                            }
                        }
                        if((flags & PickInfo.ALL_GEOM_INFO) != 0) {
                            storeInterestData(pickInfo, flags, geom, geomIndex, 
                                              vtxIndexArr, iPnt, sdist[0]);                      
       		        }
                    }
		    pnts[0].set(pnts[1]);
                    vtxIndexArr[0] = vtxIndexArr[1];
		    pnts[1].set(pnts[2]);
                    vtxIndexArr[1] = vtxIndexArr[2];
		}
	    }
	    break;
	case PickShape.PICKCYLINDER:
	    PickCylinder pickCylinder= (PickCylinder) pickShape;

	    while (i < stripVertexCounts.length) {  
		j = stripStartVertexIndices[i];
		end = j + stripVertexCounts[i++];
                for(int k=0; k<2; k++) {
                    vtxIndexArr[k] = j;
                    getVertexData(j++, pnts[k]);
                }
		while (j < end) {
                    vtxIndexArr[2] = j;
		    getVertexData(j++, pnts[2]);
                    if (intersectCylinder(pnts, pickCylinder, sdist, iPnt)) {
			if (flags == 0) {
			    return true;
			}
			if (sdist[0] < minDist) {
			    minDist = sdist[0];
			    x = iPnt.x;
			    y = iPnt.y;
			    z = iPnt.z;
                            if((flags & PickInfo.CLOSEST_GEOM_INFO) != 0) {
                                storeInterestData(pickInfo, flags, geom, geomIndex, 
                                                  vtxIndexArr, iPnt, sdist[0]);
                            }
                        }
                        if((flags & PickInfo.ALL_GEOM_INFO) != 0) {
                            storeInterestData(pickInfo, flags, geom, geomIndex, 
                                              vtxIndexArr, iPnt, sdist[0]);                      
       		        }
                    }
		    pnts[0].set(pnts[1]);
                    vtxIndexArr[0] = vtxIndexArr[1];
		    pnts[1].set(pnts[2]);
                    vtxIndexArr[1] = vtxIndexArr[2];
		}
	    }
	    break;
	case PickShape.PICKCONE:
	    PickCone pickCone= (PickCone) pickShape;

	    while (i < stripVertexCounts.length) {  
		j = stripStartVertexIndices[i];
		end = j + stripVertexCounts[i++];
                for(int k=0; k<2; k++) {
                    vtxIndexArr[k] = j;
                    getVertexData(j++, pnts[k]);
                }
		while (j < end) {
                    vtxIndexArr[2] = j;
		    getVertexData(j++, pnts[2]);
		    if (intersectCone(pnts, pickCone, sdist, iPnt)) {
			if (flags == 0) {