diff --git a/src/settings.rs b/src/settings.rs
index dca1763..2e27e87 100644
--- a/src/settings.rs
+++ b/src/settings.rs
@@ -32,6 +32,28 @@ pub struct UserSettings{
 	fov:Fov,
 	sensitivity:Sensitivity,
 }
+impl UserSettings{
+	pub fn calculate_fov(&self,zoom:f64,screen_size:&glam::UVec2)->glam::DVec2{
+		zoom*match &self.fov{
+			&Fov::Exactly{x,y}=>glam::dvec2(x,y),
+			Fov::DeriveX{x,y}=>match x{
+				DerivedFov::FromScreenAspect=>glam::dvec2(y*(screen_size.x as f64/screen_size.y as f64),*y),
+				DerivedFov::FromAspect(ratio)=>glam::dvec2(y*ratio.ratio,*y),
+			},
+			Fov::DeriveY{x,y}=>match y{
+				DerivedFov::FromScreenAspect=>glam::dvec2(*x,x*(screen_size.y as f64/screen_size.x as f64)),
+				DerivedFov::FromAspect(ratio)=>glam::dvec2(*x,x*ratio.ratio),
+			},
+		}
+	}
+	pub fn calculate_sensitivity(&self)->glam::DVec2{
+		match &self.sensitivity{
+			&Sensitivity::Exactly{x,y}=>glam::dvec2(x,y),
+			Sensitivity::DeriveX{x,y}=>glam::dvec2(y*x.ratio,*y),
+			Sensitivity::DeriveY{x,y}=>glam::dvec2(*x,x*y.ratio),
+		}
+	}
+}
 
 /*
 //sensitivity is raw input dots (i.e. dpi = dots per inch) to radians conversion factor