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basic-geometry/vector2.c

@@ -0,0 +1,65 @@
+#include "vector2.h"
+
+// =================== Angle ==================== //
+
+float bg_fp32_vector2_get_angle(const BgFP32Vector2* vector1, const BgFP32Vector2* vector2, const angle_unit_t unit)
+{
+    if (vector1 == 0 || vector2 == 0) {
+        return 0.0f;
+    }
+
+    const float square_module1 = bg_fp32_vector2_get_square_module(vector1);
+
+    if (square_module1 <= BG_FP32_SQUARE_EPSYLON) {
+        return 0.0f;
+    }
+
+    const float square_module2 = bg_fp32_vector2_get_square_module(vector2);
+
+    if (square_module2 <= BG_FP32_SQUARE_EPSYLON) {
+        return 0.0f;
+    }
+
+    const float cosine = bg_fp32_vector2_dot_product(vector1, vector2) / sqrtf(square_module1 * square_module2);
+
+    if (cosine >= 1.0f - BG_FP32_EPSYLON) {
+        return 0.0f;
+    }
+
+    if (cosine <= -1.0f + BG_FP32_EPSYLON) {
+        return bg_fp32_angle_get_half_circle(unit);
+    }
+
+    return bg_fp32_radians_to_units(acosf(cosine), unit);
+}
+
+double bg_fp64_vector2_get_angle(const BgFP64Vector2* vector1, const BgFP64Vector2* vector2, const angle_unit_t unit)
+{
+    if (vector1 == 0 || vector2 == 0) {
+        return 0.0;
+    }
+
+    const double square_module1 = bg_fp64_vector2_get_square_module(vector1);
+
+    if (square_module1 <= BG_FP64_SQUARE_EPSYLON) {
+        return 0.0;
+    }
+
+    const double square_module2 = bg_fp64_vector2_get_square_module(vector2);
+
+    if (square_module2 <= BG_FP64_SQUARE_EPSYLON) {
+        return 0.0;
+    }
+
+    const double cosine = bg_fp64_vector2_dot_product(vector1, vector2) / sqrt(square_module1 * square_module2);
+
+    if (cosine >= 1.0 - BG_FP64_EPSYLON) {
+        return 0.0;
+    }
+
+    if (cosine <= -1.0 + BG_FP64_EPSYLON) {
+        return bg_fp64_angle_get_half_circle(unit);
+    }
+
+    return bg_fp64_radians_to_units(acos(cosine), unit);
+}