wacky angle sin cos test

src/integer.rs

@@ -480,6 +480,26 @@ impl std::ops::Mul<Angle32> for Angle32{
 		Angle32(self.0.wrapping_mul(rhs.0))
 	}
 }
+#[test]
+fn angle_sin_cos(){
+	fn close_enough(lhs:Planar64,rhs:Planar64)->bool{
+		(lhs-rhs).abs()<Planar64::EPSILON*4
+	}
+	fn test_angle(f:f64){
+		let a=Angle32((f/Angle32::ANGLE32_TO_FLOAT64_RADIANS) as i32);
+		println!("a={:#034b}",a.0);
+		let (c,s)=a.cos_sin();
+		let h=(s*s+c*c).sqrt();
+		println!("cordic s={} c={}",(s/h).divide(),(c/h).divide());
+		let (fs,fc)=f.sin_cos();
+		println!("float s={} c={}",fs,fc);
+		assert!(close_enough((c/h).divide().fix_1(),Planar64::raw((fc*((1u64<<32) as f64)) as i64)));
+		assert!(close_enough((s/h).divide().fix_1(),Planar64::raw((fs*((1u64<<32) as f64)) as i64)));
+	}
+	test_angle(1.0);
+	test_angle(std::f64::consts::PI/4.0);
+	test_angle(std::f64::consts::PI/8.0);
+}
 
 /* Unit type unused for now, may revive it for map files
 ///[-1.0,1.0] = [-2^30,2^30]