Vector2LengthSqr instead of Vector2Length

thegtproject · Feb 14, 2022 · 43832a1 · 43832a1
1 parent be82165
commit 43832a1
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Showing 3 changed files with 12 additions and 5 deletions.
diff --git a/src/body.c b/src/body.c
@@ -32,11 +32,19 @@ void UpdateBodies(BodyVector* vec)
 
 Vector2 Attract(Body* b1, Body* b2)
 {
+    // Vector2 force = Vector2Subtract(b2->position, b1->position);
+    // float distance = Vector2Length(force);
+    // distance = Clamp(distance, 1, 25);
+    // force = Vector2Normalize(force);
+    // float strength = (GravityConstant * b2->mass * b1->mass) / (distance * distance);
+
+    // a bit faster... id like to measure these two approaches more officially
     Vector2 force = Vector2Subtract(b2->position, b1->position);
-    float distance = Vector2Length(force);
-    distance = Clamp(distance, 1, 25);
+    float distance = Vector2LengthSqr(force);
+    distance = Clamp(distance, 1, 25*25);
     force = Vector2Normalize(force);
-    float strength = (GravityConstant * b2->mass * b1->mass) / (distance * distance);
+    float strength = (GravityConstant * b2->mass * b1->mass) / distance;
+
     force.x = force.x * strength;
     force.y = force.y * strength;
 

diff --git a/src/main.c b/src/main.c
@@ -8,7 +8,7 @@
 
 #include <stdio.h>
 
-static const int initialBodyCount = 128;
+static const int initialBodyCount = 512;
 
 static const int screenWidth  = 1200;
 static const int screenHeight = 650;

diff --git a/src/nbody.h b/src/nbody.h
@@ -16,6 +16,5 @@ extern void    add_random_body(void);
 extern void    add_random_body_fn(Vector2(*positionFunc)(void));
 extern void    add_random_body_at_mouse(void);
 extern void    remove_last_body(void);
-
 extern Vector2 get_random_circlepos(void);
 extern Vector2 get_random_worldpos(void);