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80 lines
2.9 KiB
Text
80 lines
2.9 KiB
Text
/// @func BBMOD_MixVec2FromSpeedModule([_property[, _from[, _to[, _min[, _max]]]]])
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///
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/// @extends BBMOD_ParticleModule
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///
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/// @desc A universal particle module that mixes values of particles' two
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/// consecutive properties between two values based on the magnitude of their
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/// velocity vector.
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///
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/// @param {Real} [_property] The first of the two consecutive properties. Use
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/// values from {@link BBMOD_EParticle}. Defaults to `undefined`.
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/// @param {Struct.BBMOD_Vec2} [_from] The value when the particle has full health.
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/// Defaults to `(0.0, 0.0)`.
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/// @param {Struct.BBMOD_Vec2} [_to] The value when the particle has no health left.
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/// Defaults to `_from`.
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/// @param {Real} [_min] If the particles' speed is less than this, then the
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/// property is equal to `_from`. Defaults to 0.0.
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/// @param {Real} [_max] If the particles' speed is greater than this, then the
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/// property is equal to `_to`. Defaults to 1.0.
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///
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/// @see BBMOD_EParticle
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function BBMOD_MixVec2FromSpeedModule(
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_property=undefined,
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_from=new BBMOD_Vec2(),
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_to=_from.Clone(),
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_min=0.0,
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_max=1.0
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) : BBMOD_ParticleModule() constructor
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{
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BBMOD_CLASS_GENERATED_BODY;
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/// @var {Real} The first of the two consecutive properties. Use values from
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/// {@link BBMOD_EParticle}. Default value is `undefined`.
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Property = _property;
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/// @var {Struct.BBMOD_Vec2} The value when the particle has full health.
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/// Default value is `(0.0, 0.0)`.
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From = _from;
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/// @var {Struct.BBMOD_Vec2} The value when the particle has no health left.
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/// Default value is the same as {@link BBMOD_MixVec2FromSpeedModule.From}.
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To = _to;
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/// @var {Real} If the particles' speed is less than this, then the property
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/// is equal to {@link BBMOD_MixVec2FromSpeedModule.From}. Default value is 0.0.
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Min = _min;
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/// @var {Real} If the particles' speed is greater than this, then the property
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/// is equal to {@link BBMOD_MixVec2FromSpeedModule.To}. Default value is 1.0.
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Max = _max;
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static on_update = function (_emitter, _deltaTime) {
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var _property = Property;
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if (_property != undefined)
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{
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var _to = To;
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var _toX = _to.X;
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var _toY = _to.Y;
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var _from = From;
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var _fromX = _from.X;
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var _fromY = _from.Y;
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var _particles = _emitter.Particles;
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var _min = Min;
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var _max = Max;
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var _div = _max - _min;
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var _particleIndex = 0;
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repeat (_emitter.ParticlesAlive)
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{
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var _velX = _particles[# BBMOD_EParticle.VelocityX, _particleIndex];
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var _velY = _particles[# BBMOD_EParticle.VelocityY, _particleIndex];
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var _velZ = _particles[# BBMOD_EParticle.VelocityZ, _particleIndex];
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var _speed = sqrt((_velX * _velX) + (_velY + _velY) + (_velZ * _velZ));
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var _factor = clamp((_speed - _min) / _div, 0.0, 1.0);
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_particles[# _property, _particleIndex] = lerp(_toX, _fromX, _factor);
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_particles[# _property + 1, _particleIndex] = lerp(_toY, _fromY, _factor);
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++_particleIndex;
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}
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}
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};
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}
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