Lots of work in progress on pill intersections, but will have to read more up on it

1 files changed, 29 insertions, 0 deletions

diff --git a/frontend/shared_cpp/mathlib.h b/frontend/shared_cpp/mathlib.h
index 7595045..2784f6a 100644
--- a/frontend/shared_cpp/mathlib.h
+++ b/frontend/shared_cpp/mathlib.h
@@ -2,6 +2,11 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
+#include <cmath>
+
+#define MAX(x, y) (((x) > (y)) ? (x) : (y))
+#define MIN(x, y) (((x) < (y)) ? (x) : (y))
+#define ABS(x) (x < 0 ? -x : x)
 
 struct Vector2 {
     float x = 0;
@@ -11,6 +16,12 @@ struct Vector2 {
         return { x + other.x, y + other.y };
     }
 
+    Vector2& operator+=(Vector2 other) {
+        x += other.x;
+        y += other.y;
+        return *this;
+    }
+
     Vector2 operator-(Vector2 other) {
         return { x - other.x, y - other.y };
     }
@@ -19,6 +30,10 @@ struct Vector2 {
         return { x * s, y * s };
     }
 
+    Vector2 operator/(float s) {
+        return { x / s, y / s };
+    }
+
     float dot(Vector2 other) {
         return x * other.x + y * other.y;
     }
@@ -45,6 +60,20 @@ struct Vector2 {
     void printDebug(const char* name) {
         printf("%s=Vector2(%f, %f)\n", name, x, y);
     }
+
+    float determinant(Vector2 other) {
+        //
+        // [ a b ]
+        // [ c d ]
+        //
+        // [ x other.x ]
+        // [ y other.y ]
+        //
+        // det = a * d - b * c
+        // det = x * other.y - other.x * y
+        //
+        return x * other.y - other.x * y;
+    }
 };
 
 struct Vector3 {