| 1 |
using System; |
| 2 |
|
| 3 |
namespace Oni |
| 4 |
{ |
| 5 |
internal static class MathHelper |
| 6 |
{ |
| 7 |
public const float Eps = 1e-5f; |
| 8 |
public const float Pi = 3.141593f; |
| 9 |
public const float HalfPi = Pi / 2.0f; |
| 10 |
public const float PiOver4 = Pi / 4.0f; |
| 11 |
public const float TwoPi = 2.0f * Pi; |
| 12 |
|
| 13 |
public static float ToDegrees(float radians) => radians * (180.0f / Pi); |
| 14 |
public static float ToRadians(float degrees) => degrees * (Pi / 180.0f); |
| 15 |
public static float Distance(float v1, float v2) => Math.Abs(v2 - v1); |
| 16 |
public static float Lerp(float v1, float v2, float amount) => v1 + (v2 - v1) * amount; |
| 17 |
|
| 18 |
public static int Lerp(int v1, int v2, float amount) |
| 19 |
{ |
| 20 |
if (amount == 0.0f) |
| 21 |
return v1; |
| 22 |
|
| 23 |
if (amount == 1.0f) |
| 24 |
return v2; |
| 25 |
|
| 26 |
return (int)(v1 + (v2 - v1) * amount); |
| 27 |
} |
| 28 |
|
| 29 |
public static float Clamp(float v, float min, float max) |
| 30 |
{ |
| 31 |
v = (v > max) ? max : v; |
| 32 |
v = (v < min) ? min : v; |
| 33 |
|
| 34 |
return v; |
| 35 |
} |
| 36 |
|
| 37 |
public static int Clamp(int v, int min, int max) |
| 38 |
{ |
| 39 |
v = (v > max) ? max : v; |
| 40 |
v = (v < min) ? min : v; |
| 41 |
|
| 42 |
return v; |
| 43 |
} |
| 44 |
|
| 45 |
public static float Area(Vector2[] points) |
| 46 |
{ |
| 47 |
float area = 0.0f; |
| 48 |
|
| 49 |
for (int i = 0; i < points.Length; i++) |
| 50 |
{ |
| 51 |
int j = (i + 1) % points.Length; |
| 52 |
area += points[i].X * points[j].Y; |
| 53 |
area -= points[i].Y * points[j].X; |
| 54 |
} |
| 55 |
|
| 56 |
return Math.Abs(area * 0.5f); |
| 57 |
} |
| 58 |
} |
| 59 |
} |
