From a767c658cb603de9ec9f0577627b9b32cbf82b2b Mon Sep 17 00:00:00 2001
From: pacien
Date: Fri, 22 Dec 2017 01:53:55 +0100
Subject: Simplify and add geom. and matrix utility functions

Signed-off-by: pacien <pacien.trangirard@pacien.net>
---
 include/common/geom.h | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

(limited to 'include/common/geom.h')

diff --git a/include/common/geom.h b/include/common/geom.h
index a843c76..b3564a5 100644
--- a/include/common/geom.h
+++ b/include/common/geom.h
@@ -38,6 +38,46 @@ typedef struct {
   CartesianVector origin, target;
 } CartesianMapping;
 
+
+/**
+ * Function: m
+ * Shorthand for an identity mapping.
+ *
+ * Parameters:
+ *   x - the x-coordinate
+ *   y - the y-coordinate
+ *
+ * Returns:
+ *   A cartesian identity mapping
+ */
+CartesianMapping m(int x, int y);
+
+/**
+ * Function: v
+ * Shorthand for a vector.
+ *
+ * Parameters:
+ *   x - the x-coordinate
+ *   y - the y-coordinate
+ *
+ * Returns:
+ *   An integer vector
+ */
+CartesianVector v(int x, int y);
+
+/**
+ * Function: mappings_equals
+ * Compares two cartesian mappings.
+ *
+ * Parameters:
+ *   m1 - the first mapping
+ *   m2 - the second mapping
+ *
+ * Returns:
+ *   T(m1 is equal to m2)
+ */
+bool mappings_equals(CartesianMapping m1, CartesianMapping m2);
+
 /**
  * Function: vector_equals
  * Compares two cartesian vectors.
@@ -51,4 +91,18 @@ typedef struct {
  */
 bool vector_equals(CartesianVector v1, CartesianVector v2);
 
+/**
+ * Function: triangle_area
+ * Computes the area of a triangle.
+ *
+ * Parameters:
+ *   v1 - first vertex
+ *   v2 - second vertex
+ *   v3 - third vertex
+ *
+ * Returns:
+ *   The area of the triangle spawned by the three supplied vertices
+ */
+IntVector triangle_area(CartesianVector v1, CartesianVector v2, CartesianVector v3);
+
 #endif
-- 
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