Pulling updates

.travis.yml

@@ -0,0 +1,7 @@
+
+language: c
+
+script: make dep && make && make test
+
+comiler: 
+  -gcc

Makefile

@@ -22,7 +22,10 @@ geometry_test.o: geometry_test.c geometry.h
 geometry.o: geometry.c geometry.h
 	$(CC) $(CFLAGS) $< -o $@
 
+test: geometry_test
+	./geometry_test
 dep:
+	sudo apt-get update
 	sudo apt-get install check
 
 clean:

geometry.c

@@ -69,3 +69,8 @@ void coord_2d_midpoint(coord_2d_t* mid, const coord_2d_t* a, const coord_2d_t* b
     mid->y = ((a->y + b->y) / 2.0 );
 
 }
+
+double coord_2d_area_triangle(const coord_2d_t* a, const coord_2d_t* b, const coord_2d_t* c){
+    double area = ((a->x*(b->y - c->y)) + (b->x*(c->y - a->y)) + (c->x*(a->y - b->y)))/2;
+    return area;
+}

geometry.h

@@ -24,3 +24,5 @@ bool coord_2d_eq(const coord_2d_t* a, const coord_2d_t* b);
 
 /* Calculate the midpoint between two 2D coordinates and load into mid */
 void coord_2d_midpoint(coord_2d_t* mid, const coord_2d_t* a, const coord_2d_t* b);
+
+double coord_2d_area_triangle(const coord_2d_t* a, const coord_2d_t* b, const coord_2d_t* c);

geometry_test.c

@@ -145,6 +145,34 @@ START_TEST(test_2d_midpoint)
 }
 END_TEST
 
+START_TEST(test_2d_area_triangle)
+{
+    coord_2d_t a;
+    coord_2d_t b;
+    coord_2d_t c;
+
+    a.x = 0.00;
+    a.y = 0.00;
+    b.x = 2.00;
+    b.y = 0.00;
+    c.x = 2.00;
+    c.y = 2.00;
+
+    ck_assert(coord_2d_area_triangle(&a, &b, &c) == 2.00);
+
+    a.x = 0.00;
+    a.y = 0.00;
+    b.x = 10.00;
+    b.y = 0.00;
+    c.x = 10.00;
+    c.y = 10.00;
+
+    ck_assert(coord_2d_area_triangle(&a, &b, &c) == 50.00);
+
+
+
+}
+END_TEST
 /* coord_2d Test Suite */
 Suite* coord_2d_suite(void)
 {
@@ -162,11 +190,14 @@ Suite* coord_2d_suite(void)
     TCase* tc_2d_midpoint = tcase_create("coord_2d_midpoint");
     tcase_add_test(tc_2d_midpoint, test_2d_midpoint);
 
+    TCase* tc_2d_area_triangle = tcase_create("coord_2d_area_triangle");
+    tcase_add_test(tc_2d_area_triangle, test_2d_area_triangle);
+
     /* Add Cases to Suite */
     suite_add_tcase(s, tc_2d_eq);
     suite_add_tcase(s, tc_2d_dist);
     suite_add_tcase(s, tc_2d_midpoint);
-
+    suite_add_tcase(s, tc_2d_area_triangle);
     /* Return Suite */
     return s;