mirror of
https://github.com/AlexMacocian/MonoGame.Extended.git
synced 2026-07-16 07:29:29 +00:00
Christopher Whitley
2ea7e85398
* Add enabled state for modifiers * Add enabled state for interpolators * Move AutoTrigger to effect not emitters * Remove LineUniformProfile * Set Enabled field true by default * Don't render invisible emitters * Remove unused member * Document update method * Add documentation * Remove test now that LineUniformProfile was removed * Fix unit tests
80 lines
2.7 KiB
C#
80 lines
2.7 KiB
C#
// Copyright (c) Craftwork Games. All rights reserved.
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// Licensed under the MIT license.
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// See LICENSE file in the project root for full license information.
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using System;
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using Microsoft.Xna.Framework;
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using MonoGame.Extended.Particles.Data;
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namespace MonoGame.Extended.Particles.Modifiers;
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/// <summary>
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/// A modifier that creates a gravitational vortex effect, pulling particles toward a central point.
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/// </summary>
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/// <remarks>
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/// The <see cref="VortexModifier"/> simulates a gravitational attraction between a central point and
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/// each particle. The strength of the attraction is based on gravitational principles, where the force
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/// is proportional to the masses and inversely proportional to the square of the distance.
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///
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/// The actual acceleration applied to each particle is clamped to prevent particles from moving
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/// too quickly when they get close to the center of the vortex.
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/// </remarks>
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public unsafe class VortexModifier : Modifier
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{
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private const float GRAVITY = 100000f;
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/// <summary>
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/// Gets or sets the center position of the vortex in 2D space.
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/// </summary>
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/// <remarks>
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/// Particles will be attracted toward this point.
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/// </remarks>
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public Vector2 Position;
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/// <summary>
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/// Gets or sets the mass of the vortex center.
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/// </summary>
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/// <remarks>
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/// Higher mass values create stronger attraction forces.
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/// </remarks>
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public float Mass;
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/// <summary>
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/// Gets or sets the maximum speed that the vortex can impart on particles.
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/// </summary>
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/// <remarks>
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/// This value limits how quickly particles can be accelerated by the vortex,
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/// preventing extreme velocities when particles get very close to the center.
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/// </remarks>
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public float MaxSpeed;
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/// <summary>
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/// Updates all particles by applying a gravitational force towards the vortex center.
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/// </summary>
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/// <inheritdoc/>
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public override unsafe void Update(float elapsedSeconds, ParticleIterator iterator)
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{
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if (!Enabled) { return; }
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while (iterator.HasNext)
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{
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Particle* particle = iterator.Next();
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float distx = Position.X - particle->Position[0];
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float disty = Position.Y - particle->Position[1];
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float distance2 = (distx * distx) + (disty * disty);
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float distance = (float)Math.Sqrt(distance2);
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float m = (GRAVITY * Mass * particle->Mass) / distance2;
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m = Math.Max(Math.Min(m, MaxSpeed), -MaxSpeed) * elapsedSeconds;
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distx = (distx / distance) * m;
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disty = (disty / distance) * m;
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particle->Velocity[0] += distx;
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particle->Velocity[1] += disty;
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}
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}
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}
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