MathHelper

Static class with common math utilities and constants.

using Xengine.Math;

Constants

Constant	Value	Description
`MathHelper.PI`	3.14159...	Pi constant
`MathHelper.TwoPI`	6.28318...	2 * Pi
`MathHelper.HalfPI`	1.57079...	Pi / 2
`MathHelper.Deg2Rad`	0.01745...	Degrees to radians multiplier
`MathHelper.Rad2Deg`	57.2957...	Radians to degrees multiplier
`MathHelper.Epsilon`	0.00001	Small value for comparisons

static float Clamp(float value, float min, float max)

float health = MathHelper.Clamp(health, 0, maxHealth);

static float Clamp01(float value)

Clamps value between 0 and 1.

float t = MathHelper.Clamp01(progress);

static float Lerp(float a, float b, float t)

Linear interpolation between a and b.

float value = MathHelper.Lerp(0, 100, 0.5f); // 50

static float LerpUnclamped(float a, float b, float t)

Lerp without clamping t to [0,1].

static float InverseLerp(float a, float b, float value)

Returns where value lies between a and b (0 to 1).

float t = MathHelper.InverseLerp(0, 100, 25); // 0.25

static float Remap(float value, float fromMin, float fromMax, float toMin, float toMax)

Remap value from one range to another.

// Convert 0-100 to 0-1
float normalized = MathHelper.Remap(75, 0, 100, 0, 1); // 0.75

static float SmoothStep(float from, float to, float t)

Smooth interpolation with ease-in/ease-out.

float smooth = MathHelper.SmoothStep(0, 1, t);

static float MoveTowards(float current, float target, float maxDelta)

Move towards target by at most maxDelta.

health = MathHelper.MoveTowards(health, maxHealth, healRate * Time.Delta);

static float Repeat(float t, float length)

Loops value between 0 and length.

float looped = MathHelper.Repeat(time, 5f); // 0 to 5, then back to 0

static float PingPong(float t, float length)

Ping-pong value between 0 and length.

float bounce = MathHelper.PingPong(Time.Now, 1f); // 0 to 1 to 0 to 1...

static bool Approximately(float a, float b)

Check if two floats are approximately equal.

if (MathHelper.Approximately(distance, 0f))
    Log.Info("At destination!");

float radians = MathHelper.ToRadians(90);  // 1.5708
float degrees = MathHelper.ToDegrees(MathHelper.PI); // 180

float healthPercent = MathHelper.Clamp01((float)health / maxHealth);
float barWidth = MathHelper.Lerp(0, maxBarWidth, healthPercent);

float t = MathHelper.PingPong(Time.Now, 1f);
float smooth = MathHelper.SmoothStep(0, 1, t);
position.Y = MathHelper.Lerp(minY, maxY, smooth);

angle = MathHelper.Repeat(angle, 360f); // Keep between 0-360