From 699ac44864e75549fb3d238d36f0bc1dd645ddac Mon Sep 17 00:00:00 2001
From: Samo Penic <samo.penic@gmail.com>
Date: Mon, 21 May 2018 13:52:58 +0000
Subject: [PATCH] Fixes in a0 calculation and calculation of stretching energy in vertexmove
---
src/vertex.c | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/src/vertex.c b/src/vertex.c
index f733d49..59a6419 100644
--- a/src/vertex.c
+++ b/src/vertex.c
@@ -1,3 +1,4 @@
+/* vim: set ts=4 sts=4 sw=4 noet : */
#include<stdlib.h>
#include<math.h>
#include<string.h>
@@ -199,6 +200,19 @@
return TS_SUCCESS;
}
+/** Calculates the triple product of vectors defined by vertices vtx1, vtx2 and vtx3, ($\mathrm{vtx}_1\cdot(\mathrm{vtx}_2\cross\mathrm{vtx}_3$):
+ * \begin{vmatrix}
+ * x_1 & y_1 & z_1 \\
+ * x_2-x_1 & y_2-y_1 & z_2-z_1\\
+ * x_3-x_1 & y_3-y_1 & z_3-z_1\\
+ * \end{vmatrix}
+ * where the vertices coordinates are denoted by corresponding vertex index number. Function is used to determine the orientation of area formed by triangle formed by the three given vertices.
+ *
+ * @param vtx1 is first vertex, according to which the orientation is calculated
+ * @param vtx2 is the second vertex
+ * @param vtx3 is the third vertex
+ * @returns directionality of the area of the triangle formed by vertices vtx1, vtx2 and vtx3. It is positive if vtx1, vtx2 and vtx3 are oriented counter-clockwise.
+*/
inline ts_double vtx_direct(ts_vertex *vtx1, ts_vertex *vtx2, ts_vertex *vtx3){
ts_double dX2=vtx2->x-vtx1->x;
ts_double dY2=vtx2->y-vtx1->y;
--
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