From 04be907cbba161af7eda231f8a6a1856fc3a6042 Mon Sep 17 00:00:00 2001
From: Franz Zotter <fzotter@users.sourceforge.net>
Date: Sat, 25 Aug 2012 22:51:30 +0000
Subject: improved deterministic behavior of [mtx_qhull], however planar
 polygons do not fully work yet.

svn path=/trunk/externals/iem/iemmatrix/; revision=16172
---
 src/mtx_qhull/vectors.c | 139 +++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 125 insertions(+), 14 deletions(-)

(limited to 'src/mtx_qhull/vectors.c')

diff --git a/src/mtx_qhull/vectors.c b/src/mtx_qhull/vectors.c
index 6cc3dd8..d9d3bd0 100644
--- a/src/mtx_qhull/vectors.c
+++ b/src/mtx_qhull/vectors.c
@@ -1,7 +1,4 @@
 #include "vectors.h"
-#include <math.h>
-#include <stdlib.h>
-#include <stdio.h>
 
 
 vector_t initVector (float x, float y, float z) {
@@ -9,13 +6,16 @@ vector_t initVector (float x, float y, float z) {
     return vec;
 }
 
+float lengthVector(vector_t v) {
+    return sqrtf(v.c[0]*v.c[0]+v.c[1]*v.c[1]+v.c[2]*v.c[2]);
+}
 vector_t normalizeVector(vector_t v) {
-    float r=sqrtf(v.c[0]*v.c[0]+v.c[1]*v.c[1]+v.c[2]*v.c[2]);
+    float r=lengthVector(v);
     v.c[0]/=r;
     v.c[1]/=r;
     v.c[2]/=r;
     return v;
-};
+}
 
 plane_t initPlane (vector_t normal, vector_t point) {
     plane_t plane;
@@ -24,6 +24,13 @@ plane_t initPlane (vector_t normal, vector_t point) {
     return plane;
 }
 
+line_t initLine (vector_t direction, vector_t point) {
+    line_t line;
+    line.point = point;
+    line.direction = normalizeVector(direction);
+    return line;
+}
+
 points_t initPoints (const float *x,
         const float *y, const float *z, 
         size_t num_points) {
@@ -63,11 +70,29 @@ float innerProduct (vector_t v1, vector_t v2) {
     return v1.c[0]*v2.c[0] + v1.c[1]*v2.c[1] + v1.c[2]*v2.c[2];
 }
 
+float distancePointPoint(const vector_t a,
+        const vector_t b) {
+    vector_t d=subtractVectors(b,a);
+    return lengthVector(d);
+}
+
 float distancePointPlane (vector_t point, plane_t plane) {
     return innerProduct(point, plane.normal) - 
         innerProduct(plane.point, plane.normal);
 }
 
+float distancePointLine (vector_t point, line_t line) {
+    return lengthVector(crossProduct(line.direction,
+                subtractVectors(point,line.point)));
+}
+
+float distancePointLineOnPlane (vector_t point, 
+        line_t line, plane_t plane) {
+    vector_t normal_in_plane = normalizeVector(crossProduct(
+                line.direction, plane.normal));
+    return innerProduct(subtractVectors(point,line.point),normal_in_plane);
+}
+
 vector_t addVectors(vector_t v1, vector_t v2) {
     vector_t v3;
     v3.c[0]=v1.c[0]+v2.c[0];
@@ -92,31 +117,113 @@ vector_t scaleVector(vector_t v1, float f) {
     return v2;
 }
 
+/*
 vector_t averagePoints(points_t points) {
     vector_t m = initVector(0.0f, 0.0f, 0.0f);
     size_t i;
-    for (i=0; i<points.num_points; i++)
-        m=addVectors(points.v[i],m);
-    m=scaleVector(m,1.0f/((float)points.num_points));
+    for (i=0; i<getNumPoints(points); i++)
+        m=addVectors(getPoint(points,m));
+    m=scaleVector(m,1.0f/((float)getNumPoints(points)));
     return m;
 }
-
 vector_t normalOfPoints(points_t points) {
     vector_t m = averagePoints(points);
     vector_t n = initVector(0.0f, 0.0f, 0.0f);
     size_t i;
-    for (i=0; i<points.num_points; i++) {
-        n=addVectors(crossProduct(points.v[i],m),n);
+    for (i=0; i<getNumPoints(points); i++) {
+        n=addVectors(crossProduct(getPoint(points,i),m),n);
     }
     return n;
 }
-
 plane_t planeFromPoints(points_t points) {
     vector_t p=averagePoints(points);
     vector_t n=normalOfPoints(points);
     plane_t pl=initPlane(n,p);
     return pl;
 }
+*/
+
+plane_t planeFromThreePoints(const vector_t a, 
+        const vector_t b, const vector_t c) {
+    vector_t ab = subtractVectors(b,a);
+    vector_t ac = subtractVectors(c,a);
+    vector_t n = normalizeVector(crossProduct(ab,ac));
+    return initPlane(n,a);
+}
+
+line_t lineFromTwoPoints(const vector_t a, 
+        const vector_t b) {
+    vector_t direction = subtractVectors(b,a);
+    return initLine(direction,a);
+}
+
+size_t getNumPoints(const points_t points) {
+    return points.num_points;
+}
+
+vector_t getPoint(const points_t points, 
+        const index_t index) {
+    if ((index>=0)&&(index<getNumPoints(points)))
+        return points.v[index];
+    return initVector(0.0f,0.0f,0.0f);
+}
+
+vector_t averageListedPoints(const points_t points, const list_t list) {
+    index_t i;
+    vector_t m = initVector(0.0f, 0.0f, 0.0f);
+    for (i=0; i<getLength(list); i++) {
+        m=addVectors(getPoint(points,getEntry(list,i)),m);
+    }
+    m=scaleVector(m,1.0f/((float)getLength(list)));
+    return m;
+}
+
+vector_t normalOfListedPoints(const points_t points, const list_t list) {
+    vector_t m = averageListedPoints(points,list);
+    vector_t n = initVector(0.0f, 0.0f, 0.0f);
+    vector_t d1,d2,c;
+    index_t i;
+    for (i=1; i<=getLength(list); i++) {
+        d1=subtractVectors(getPoint(points,getEntry(list,i-1)),m);
+        d2=subtractVectors(getPoint(points,getEntry(list,i%getLength(list))),m);
+        c=crossProduct(d1,d2);
+        n=addVectors(c,n);
+    }
+    return n;
+}
+
+vector_t directionOfListedPoints(const points_t points, const list_t list) {
+    vector_t m = averageListedPoints(points,list);
+    vector_t dir = initVector(0.0f, 0.0f, 0.0f);
+    vector_t d,c;
+    index_t i;
+    for (i=1; i<getLength(list); i++) {
+        d=subtractVectors(getPoint(points,getEntry(list,i-1)),
+                getPoint(points,getEntry(list,i)));
+        dir=addVectors(d,dir);
+    }
+    return dir;
+}
+
+plane_t planeFromListedPoints(const points_t points, const list_t list) {
+    vector_t p=averageListedPoints(points,list);
+    vector_t n=normalOfListedPoints(points,list);
+    plane_t pl=initPlane(n,p);
+    return pl;
+}
+
+
+
+line_t lineFromListedPoints(const points_t points, const list_t list) {
+    vector_t p=averageListedPoints(points,list);
+    vector_t n=directionOfListedPoints(points,list);
+    line_t l=initLine(n,p);
+    return l;
+}
+
+void printVector(vector_t v) {
+   printf("[%5.2f,%5.2f,%5.2f], ", v.c[0],v.c[1],v.c[2]);
+}
 
 void printPlane(plane_t p) {
    printf("n=");
@@ -125,7 +232,11 @@ void printPlane(plane_t p) {
    printVector(p.point);
 }
 
-void printVector(vector_t v) {
-   printf("[%5.2f,%5.2f,%5.2f], ", v.c[0],v.c[1],v.c[2]);
+void printLine(line_t l) {
+   printf("d=");
+   printVector(l.direction);
+   printf(", p=");
+   printVector(l.point);
 }
 
+
-- 
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