CPU-based 2D particle emitter. CPU-based 2D particle node used to create a variety of particle systems and effects. See also [GPUParticles2D], which provides the same functionality with hardware acceleration, but may not run on older devices. https://docs.godotengine.org/en/latest/tutorials/2d/particle_systems_2d.html Sets this node's properties to match a given [GPUParticles2D] node with an assigned [ParticlesMaterial]. Returns the [Curve] of the parameter specified by [enum Parameter]. Returns the enabled state of the given flag (see [enum ParticleFlags] for options). Restarts the particle emitter. Sets the [Curve] of the parameter specified by [enum Parameter]. Enables or disables the given flag (see [enum ParticleFlags] for options). Number of particles emitted in one emission cycle. Each particle's rotation will be animated along this [Curve]. Each particle's angular velocity will vary along this [Curve]. Each particle's animation offset will vary along this [Curve]. Each particle's animation speed will vary along this [Curve]. Each particle's initial color. If [member texture] is defined, it will be multiplied by this color. Each particle's color will vary along this [Gradient] (multiplied with [member color]). Damping will vary along this [Curve]. Unit vector specifying the particles' emission direction. Particle draw order. Uses [enum DrawOrder] values. Sets the [Color]s to modulate particles by when using [constant EMISSION_SHAPE_POINTS] or [constant EMISSION_SHAPE_DIRECTED_POINTS]. Sets the direction the particles will be emitted in when using [constant EMISSION_SHAPE_DIRECTED_POINTS]. Sets the initial positions to spawn particles when using [constant EMISSION_SHAPE_POINTS] or [constant EMISSION_SHAPE_DIRECTED_POINTS]. The rectangle's extents if [member emission_shape] is set to [constant EMISSION_SHAPE_RECTANGLE]. Particles will be emitted inside this region. See [enum EmissionShape] for possible values. The sphere's radius if [member emission_shape] is set to [constant EMISSION_SHAPE_SPHERE]. If [code]true[/code], particles are being emitted. How rapidly particles in an emission cycle are emitted. If greater than [code]0[/code], there will be a gap in emissions before the next cycle begins. The particle system's frame rate is fixed to a value. For instance, changing the value to 2 will make the particles render at 2 frames per second. Note this does not slow down the simulation of the particle system itself. If [code]true[/code], results in fractional delta calculation which has a smoother particles display effect. Gravity applied to every particle. Each particle's hue will vary along this [Curve]. Amount of time each particle will exist. Particle lifetime randomness ratio. Each particle's linear acceleration will vary along this [Curve]. If [code]true[/code], particles use the parent node's coordinate space. If [code]false[/code], they use global coordinates. If [code]true[/code], only one emission cycle occurs. If set [code]true[/code] during a cycle, emission will stop at the cycle's end. Each particle's orbital velocity will vary along this [Curve]. Align Y axis of particle with the direction of its velocity. Particle system starts as if it had already run for this many seconds. Each particle's radial acceleration will vary along this [Curve]. Emission lifetime randomness ratio. Each particle's scale will vary along this [Curve]. Particle system's running speed scaling ratio. A value of [code]0[/code] can be used to pause the particles. Each particle's initial direction range from [code]+spread[/code] to [code]-spread[/code] degrees. Each particle's tangential acceleration will vary along this [Curve]. Particle texture. If [code]null[/code], particles will be squares. Particles are drawn in the order emitted. Particles are drawn in order of remaining lifetime. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set initial velocity properties. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set angular velocity properties. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set orbital velocity properties. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set linear acceleration properties. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set radial acceleration properties. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set tangential acceleration properties. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set damping properties. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set angle properties. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set scale properties. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set hue variation properties. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set animation speed properties. Use with [method set_param_min], [method set_param_max], and [method set_param_curve] to set animation offset properties. Represents the size of the [enum Parameter] enum. Use with [method set_particle_flag] to set [member particle_flag_align_y]. Present for consistency with 3D particle nodes, not used in 2D. Present for consistency with 3D particle nodes, not used in 2D. Represents the size of the [enum ParticleFlags] enum. All particles will be emitted from a single point. Particles will be emitted on the surface of a sphere flattened to two dimensions. Particles will be emitted in the area of a rectangle. Particles will be emitted at a position chosen randomly among [member emission_points]. Particle color will be modulated by [member emission_colors]. Particles will be emitted at a position chosen randomly among [member emission_points]. Particle velocity and rotation will be set based on [member emission_normals]. Particle color will be modulated by [member emission_colors]. Represents the size of the [enum EmissionShape] enum.