From cc05fdc7396532b329f30decde5583853da92a44 Mon Sep 17 00:00:00 2001
From: Matthew Kosarek <mattkae@protonmail.com>
Date: Sat, 27 Mar 2021 20:54:27 -0400
Subject: Drawing an ellipse

---
 frontend/shared_cpp/mathlib.h | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

(limited to 'frontend/shared_cpp/mathlib.h')

diff --git a/frontend/shared_cpp/mathlib.h b/frontend/shared_cpp/mathlib.h
index 93ddbbd..7595045 100644
--- a/frontend/shared_cpp/mathlib.h
+++ b/frontend/shared_cpp/mathlib.h
@@ -41,6 +41,10 @@ struct Vector2 {
     Vector2 getPerp() {
         return { -y, x };
     }
+
+    void printDebug(const char* name) {
+        printf("%s=Vector2(%f, %f)\n", name, x, y);
+    }
 };
 
 struct Vector3 {
@@ -54,6 +58,22 @@ struct Vector4 {
     float y = 0.f;
     float z = 0.f;
     float w = 0.f;
+
+    float length() {
+        return sqrtf(x * x + y * y + z * z + w * w);
+    }
+
+    Vector4 normalize() {
+        float len = length();
+        float inverseLength = len == 0 ? 1.0 : 1.0 / len;
+
+        return { x * inverseLength, y * inverseLength, z * inverseLength, w * inverseLength };
+    }
+
+    Vector4 fromColor(float r, float g, float b, float a) {
+        float scale = 1.f / 255.f;
+        return { r * scale, g * scale, b * scale, a * scale };
+    }
 };
 
 struct Mat4x4 {
@@ -123,7 +143,7 @@ struct Mat4x4 {
 	void print() {
 		printf("[ ");
 		for (int idx = 0; idx < 16; idx++) {
-			printf("%d, ", idx);
+			printf("%f, ", m[idx]);
 		}
 		printf(" ]\n");
 	}
-- 
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