75 lines
2.7 KiB
C#
75 lines
2.7 KiB
C#
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using FarseerPhysics.Dynamics;
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using Microsoft.Xna.Framework;
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namespace FarseerPhysics.Controllers
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{
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/// <summary>
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/// Reference implementation for forces based on AbstractForceController
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/// It supports all features provided by the base class and illustrates proper
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/// usage as an easy to understand example.
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/// As a side-effect it is a nice and easy to use wind force for your projects
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/// </summary>
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public class SimpleWindForce : AbstractForceController
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{
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/// <summary>
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/// Direction of the windforce
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/// </summary>
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public Vector2 Direction { get; set; }
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/// <summary>
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/// The amount of Direction randomization. Allowed range is 0-1.
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/// </summary>
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public float Divergence { get; set; }
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/// <summary>
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/// Ignore the position and apply the force. If off only in the "front" (relative to position and direction)
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/// will be affected
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/// </summary>
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public bool IgnorePosition { get; set; }
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public override void ApplyForce(float dt, float strength)
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{
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foreach (Body body in World.BodyList)
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{
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//TODO: Consider Force Type
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float decayMultiplier = GetDecayMultiplier(body);
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if (decayMultiplier != 0)
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{
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Vector2 forceVector;
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if (ForceType == ForceTypes.Point)
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{
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forceVector = body.Position - Position;
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}
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else
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{
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Direction.Normalize();
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forceVector = Direction;
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if (forceVector.Length() == 0)
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forceVector = new Vector2(0, 1);
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}
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//TODO: Consider Divergence:
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//forceVector = Vector2.Transform(forceVector, Matrix.CreateRotationZ((MathHelper.Pi - MathHelper.Pi/2) * (float)Randomize.NextDouble()));
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// Calculate random Variation
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if (Variation != 0)
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{
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float strengthVariation = (float)Randomize.NextDouble() * MathHelper.Clamp(Variation, 0, 1);
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forceVector.Normalize();
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body.ApplyForce(forceVector * strength * decayMultiplier * strengthVariation);
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}
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else
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{
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forceVector.Normalize();
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body.ApplyForce(forceVector * strength * decayMultiplier);
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}
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}
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}
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}
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}
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}
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