From 5f0fce4191309e9526b7109a0d87c092ce6a4193 Mon Sep 17 00:00:00 2001
From: jacopo grandi <jak.sk8@hotmail.it>
Date: Thu, 18 Feb 2021 14:14:23 +0100
Subject: main

---
 umath/intersect.c |  7 +++++++
 umath/intersect.h |  7 +++++++
 umath/vec.c       | 42 ++++++++++++++++++++++++++++++++++++++++++
 umath/vec.h       | 22 ++++++++++++++++++++++
 4 files changed, 78 insertions(+)
 create mode 100644 umath/intersect.c
 create mode 100644 umath/intersect.h
 create mode 100644 umath/vec.c
 create mode 100644 umath/vec.h

(limited to 'umath')

diff --git a/umath/intersect.c b/umath/intersect.c
new file mode 100644
index 0000000..2d21389
--- /dev/null
+++ b/umath/intersect.c
@@ -0,0 +1,7 @@
+#include <intersect.h>
+
+int pt_rect (float p[], float a[], float b[]) {
+    if (p[0]>a[0] && p[0]<a[0]+b[0] && p[1]>a[1] && p[1]<a[1]+b[1]) 
+        return 1;
+    return 0;
+}
\ No newline at end of file
diff --git a/umath/intersect.h b/umath/intersect.h
new file mode 100644
index 0000000..d3e24ec
--- /dev/null
+++ b/umath/intersect.h
@@ -0,0 +1,7 @@
+#ifndef INTERSECT_H
+#define INTERSECT_H
+
+// rect is [a, b] = [pos, size]
+int pt_rect (float p[], float a[], float b[]); 
+
+#endif
\ No newline at end of file
diff --git a/umath/vec.c b/umath/vec.c
new file mode 100644
index 0000000..fe82f58
--- /dev/null
+++ b/umath/vec.c
@@ -0,0 +1,42 @@
+#include <vec.h>
+
+float vec2_add (float c[], float a[], float b[]) { 
+    c[0]=a[0]+b[0]; c[1]=a[1]+b[1]; 
+}
+float vec2_sub (float c[], float a[], float b[]) { 
+    c[0]=a[0]-b[0]; c[1]=a[1]-b[1]; 
+}
+float vec2_mul (float c[], float a[], float b) { 
+    c[0]=a[0]*b; c[1]=a[1]*b; 
+}
+float vec2_div (float c[], float a[], float b) { 
+    c[0]=a[0]/b; c[1]=a[1]/b; 
+}
+
+float vec2_mag (float v[]) { return sqrt(v[0]*v[0]+v[1]*v[1]); }
+float vec2_mag2 (float v[]) { return v[0]*v[0]+v[1]*v[1]; }
+
+void vec2_norm (float v[]) { 
+    float m=vec2_mag(v); v[0]/=m; v[1]/=m;
+}
+
+
+float vec3_add (float c[], float a[], float b[]) { 
+    c[0]=a[0]+b[0]; c[1]=a[1]+b[1]; c[2]=a[2]+b[2]; 
+}
+float vec3_sub (float c[], float a[], float b[]) { 
+    c[0]=a[0]-b[0]; c[1]=a[1]-b[1]; c[2]=a[2]-b[2]; 
+}
+float vec3_mul (float c[], float a[], float b) { 
+    c[0]=a[0]*b; c[1]=a[1]*b; c[2]=a[2]*b; 
+}
+float vec3_div (float c[], float a[], float b) { 
+    c[0]=a[0]/b; c[1]=a[1]/b; c[2]=a[2]/b; 
+}
+
+float vec3_mag (float v[]) { return sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]); }
+float vec3_mag2 (float v[]) { return v[0]*v[0]+v[1]*v[1]+v[2]*v[2]; }
+
+void vec3_norm (float v[]) { 
+    float m=vec3_mag(v); v[0]/=m; v[1]/=m; v[2]/=m;
+}
\ No newline at end of file
diff --git a/umath/vec.h b/umath/vec.h
new file mode 100644
index 0000000..b87cae1
--- /dev/null
+++ b/umath/vec.h
@@ -0,0 +1,22 @@
+#ifndef VEC_H
+#define VEC_H
+
+#include <math.h>
+
+float vec2_add (float c[], float a[], float b[]);
+float vec2_sub (float c[], float a[], float b[]);
+float vec2_mul (float c[], float a[], float b);
+float vec2_div (float c[], float a[], float b);
+float vec2_mag (float v[]);
+float vec2_mag2 (float v[]);
+void vec2_norm (float v[]);
+
+float vec3_add (float c[], float a[], float b[]);
+float vec3_sub (float c[], float a[], float b[]);
+float vec3_mul (float c[], float a[], float b);
+float vec3_div (float c[], float a[], float b);
+float vec3_mag (float v[]);
+float vec3_mag2 (float v[]);
+void vec3_norm (float v[]);
+
+#endif
\ No newline at end of file
-- 
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