Particle

Type key: PARTICLE

Properties

angle

Rotation in degrees, clockwise. Type float, default 0.

collision_enabled

Whether the object takes part in collision tests. Type bool, default False.

collision_offset_x, collision_offset_y

Shift of the shape away from the object centre (not for bbox). Type float, default 0.

collision_points

Vertices of a polygon shape. Type list, default [].

collision_type

Shape used for collisions: 'bbox', 'rect', 'ellipse' or 'polygon'. Type str, default 'rect'.

collision_width, collision_height

Size of the shape used by rect and ellipse. Type float, default = the object’s size.

color

Fill color, text color or image tint, depending on the type. Type (r, g, b, a), default (255, 255, 255, 255).

emission_rate

Particles emitted per second; the emitter spawns continuously at this rate, or emit_particles() fires a burst. Type int, default 30.

gravity

Gravity in pixels per second² (+ pulls down, - pushes up). Type float, default 200.

max_particles

Maximum number of particles alive at the same time. Type int, default 100.

name

Name shown in the Hierarchy panel. Read-only at runtime. Type str.

particle_image

Sprite of the particles; empty uses the built-in particle dot. Type str, default ''.

particle_lifetime

Lifetime of each particle in seconds. Type float, default 1.0.

particle_size

Radius of a particle in pixels. Type int, default 4.

particle_speed

Initial speed of a particle in pixels per second. Type int, default 120.

physics_angular_damping

Angular velocity damping. Type float, default 0.

physics_elasticity

Bounciness (0 = fully inelastic, 1 = fully elastic). Type float, default 0.2.

physics_enabled

Whether the rigid body is simulated. Type bool, default False.

physics_fixed_rotation

Keep the rotation fixed (collisions do not spin the object). Type bool, default False.

physics_friction

Friction coefficient. Type float, default 0.6.

physics_gravity_scale

Gravity multiplier (0 = unaffected by gravity). Type float, default 1.

physics_linear_damping

Linear velocity damping. Type float, default 0.

physics_mass

Mass. Type float, default 1.

physics_shape_height, physics_shape_width

Size of the rect/ellipse body shape (0 = use the object’s own size). Type float, default 0.

physics_shape_offset_x, physics_shape_offset_y

Shift of the body shape away from the object centre. Type float, default 0.

physics_shape_points

Vertices of a polygon body shape. Type list, default [].

physics_shape_type

Body shape: 'rect', 'ellipse' or 'polygon'. Type str, default 'rect'.

physics_type

Rigid-body type: 'static', 'dynamic' or 'kinematic'. Type str, default 'dynamic'.

pivot

Transform anchor mode, see set_pivot(). Type str, default 'center'.

pivot_x, pivot_y

Coordinates of a 'custom' anchor (in the object’s own pixel grid, origin at its top-left). Type float, default 0.

pos

(x, y); assigning it updates x and y too. Type (int, int), default (20, 20).

scale

(scale_x, scale_y). Type (float, float), default (1, 1).

scale_x, scale_y

Stretch factors (1 = original size). Type float, default 1.

script_path

Path of the attached script, relative to the project. Type str, default ''.

size

(width, height). Type (int, int).

spread_angle

Emission cone in degrees; 360 = all directions. Type int, default 360.

type

Type key; the emitter is PARTICLE. Read-only at runtime. Type str.

uuid

Unique id, used by get_object_by_uuid(). Read-only at runtime. Type str.

visible

Hidden objects are not drawn and cannot be clicked. Type bool, default True.

width, height

Size in pixels. Type int, default depends on the object type.

x, y

Position relative to the parent object. Type int, default 20.

Methods

clear_particles()

Remove every live particle.

collides_with_object(other)

Alias of is_colliding_with_object.

• other (object): the other object.

collides_with_point(x, y)

True when the point (scene coordinates) is inside the collision shape.

• x (int): point x, in scene coordinates.
• y (int): point y, in scene coordinates.

collides_with_rect(rect)

True when the shape overlaps a pygame.Rect or (x, y, w, h) tuple.

• rect (pygame.Rect | (int, int, int, int)): the rectangle, in scene coordinates.

distance_to(x, y)

Distance from the object’s centre to a point.

• x (int): point x, in scene coordinates.
• y (int): point y, in scene coordinates.

distance_to_object(other)

Distance between two object centres.

• other (object): the other object.

emit_particles(count)

Fires an immediate burst of particles.

• count (int): number of particles; defaults to 1 when omitted.

get_angle()

Rotation in degrees.

get_center()

Centre of the object (scene coordinates).

get_collision_center()

Centre of the collision shape in scene coordinates.

get_collision_offset()

The offset of the shape from the object centre.

get_collision_polygon()

The polygon vertices.

get_collision_radius()

Radius of an ellipse shape (half of its smaller side).

get_collision_rect(x, y, width, height)

The overlapping area with a rectangle, or None.

• x (int): rectangle x, in scene coordinates.
• y (int): rectangle y, in scene coordinates.
• width (int): rectangle width.
• height (int): rectangle height.

get_collision_size()

The size of the shape used by rect and ellipse.

get_collision_type()

The shape used for collisions.

get_color()

Fill, text or tint color as (r, g, b, a).

get_direction_to(x, y)

Unit vector (dx, dy) pointing from the object to a point.

• x (int): point x, in scene coordinates.
• y (int): point y, in scene coordinates.

get_emission_rate()

Particles emitted per second.

get_gravity()

Gravity applied to particles (pixels per second², + = down).

get_height()

Height in pixels.

get_max_particles()

Maximum number of simultaneously live particles.

get_name()

The name of the object.

get_particle_count()

Number of live particles right now.

get_particle_image()

Path of the particle sprite (project-relative). Empty means the built-in particle icon is used.

get_particle_lifetime()

Lifetime of each particle in seconds.

get_particle_size()

Radius of each particle in pixels.

get_particle_speed()

Initial speed of emitted particles (pixels per second).

get_pivot()

Transform anchor mode (e.g. 'center', 'top_left', 'custom').

get_pivot_point()

The anchor resolved to content pixels (x, y).

get_pos()

Local position (x, y), relative to the parent object.

get_rect()

Local pygame.Rect of the object.

get_scale()

The stretch factors as (scale_x, scale_y).

get_scale_x()

The x stretch factor.

get_scale_y()

The y stretch factor.

get_size()

Size in pixels as (width, height).

get_spread_angle()

Emission cone angle in degrees (360 = all directions).

get_type()

The type key of the object.

get_uuid()

The uuid of the object.

get_visible_state()

The visible state as a bool.

get_width()

Width in pixels.

get_world_pos()

Position in scene coordinates, i.e. with every parent offset added.

get_world_rect()

pygame.Rect in scene coordinates.

get_x()

The x part of the local position.

get_y()

The y part of the local position.

hide()

Makes the object invisible. Same as obj.visible = False.

is_colliding_with_object(other)

True when both objects have collision enabled and their shapes overlap.

• other (object): the other object.

is_colliding_with_rect(x, y, width, height)

True when the shape overlaps the given rectangle.

• x (int): rectangle x, in scene coordinates.
• y (int): rectangle y, in scene coordinates.
• width (int): rectangle width.
• height (int): rectangle height.

is_collision_enabled()

True while collision detection is on for this object.

is_hidden()

True while the object is hidden.

is_point_inside(x, y)

Cheap test: True when the point is inside the object’s bounding box.

• x (int): point x, in scene coordinates.
• y (int): point y, in scene coordinates.

is_pressed(x, y)

Pixel-perfect test: True only on a non-transparent pixel. Prefer it for clicks, not for per-frame checks.

• x (int): point x, in scene coordinates.
• y (int): point y, in scene coordinates.

is_shown()

Same as is_visible().

is_visible()

True while the object is visible.

move(dx, dy)

Moves the object by (dx, dy) pixels.

• dx (int): horizontal delta.
• dy (int): vertical delta.

reset_collision_shape()

Resets every shape field to the object’s own size.

set_angle(degrees)

Sets the rotation.

• degrees (float): angle, clockwise.

set_center(x, y)

Sets the centre (scene coordinates).

• x (int): new centre x.
• y (int): new centre y.

set_collision_ellipse(radius_x, radius_y)

Convenience: sets an ellipse by its two radii.

• radius_x (float): horizontal radius.
• radius_y (float): vertical radius.

set_collision_enabled(enabled)

Turns collision detection on or off (while it is off, every collides_with_* / is_colliding_* call returns False).

• enabled (bool): True / False.

set_collision_offset(x, y)

Moves the shape away from the object centre (follows scale and rotation).

• x (float): horizontal offset.
• y (float): vertical offset.

set_collision_polygon(points)

Sets explicit polygon vertices.

• points (list): vertex list, e.g. [(0, 0), (50, 0), (25, 40)].

set_collision_size(width, height)

Sets the size used by rect and ellipse.

• width (int): shape width.
• height (int): shape height.

set_collision_type(type)

Sets the collision shape.

• type (str): 'bbox', 'rect', 'ellipse' or 'polygon'.

set_color(color)

Sets the color.

• color ((r, g, b, a)): the new color tuple.

set_emission_rate(rate)

Sets the emission speed.

• rate (int): particles per second.

set_gravity(gravity)

Sets the particle gravity.

• gravity (float): pixels per second²; positive pulls down.

set_height(h)

Sets the height.

• h (int): new height in pixels.

set_max_particles(count)

Sets the particle limit.

• count (int): maximum live particles.

set_particle_image(path)

Sets the particle sprite.

• path (str): image file, relative to the project folder.

set_particle_lifetime(seconds)

Sets the lifetime of each particle.

• seconds (float): lifetime in seconds.

set_particle_size(size)

Sets the particle radius.

• size (int): radius in pixels.

set_particle_speed(speed)

Sets the initial speed.

• speed (int): pixels per second.

set_pivot(pivot)

Choose the transform anchor.

• pivot (str): 'center' (default), 'top_left', 'top_center', 'top_right', 'center_left', 'center_right', 'bottom_left', 'bottom_center', 'bottom_right' or 'custom'.

set_pivot_point(x, y)

Rotate/scale around a free point of the object’s own pixel grid (also sets pivot to 'custom').

• x (float): anchor x in the pixel grid.
• y (float): anchor y in the pixel grid.

set_pos(x, y)

Sets the local position.

• x (int): new x, relative to the parent object, in pixels.
• y (int): new y, relative to the parent object, in pixels.

set_scale(sx, sy)

Sets both stretch factors.

• sx (float): x stretch factor.
• sy (float): y stretch factor.

set_scale_x(sx)

Sets the x stretch factor.

• sx (float): x stretch factor.

set_scale_y(sy)

Sets the y stretch factor.

• sy (float): y stretch factor.

set_size(width, height)

Sets the size in pixels.

• width (int): new width.
• height (int): new height.

set_spread_angle(degrees)

Sets the emission cone.

• degrees (int): cone width; 360 = all directions.

set_visible_state(visible)

Sets the visible state.

• visible (bool): True shows the object, False hides it.

set_width(w)

Sets the width.

• w (int): new width in pixels.

set_world_pos(x, y)

Sets the position in scene coordinates.

• x (int): new x, in scene coordinates.
• y (int): new y, in scene coordinates.

set_x(x)

Sets the x part of the local position.

• x (int): new x, relative to the parent object.

set_y(y)

Sets the y part of the local position.

• y (int): new y, relative to the parent object.

show()

Makes the object visible. Same as obj.visible = True.

Events

on_clicked()

Pressed and released on the object.

on_collision_enter(other)

The object starts overlapping other (both need collision enabled).

• other (object): the other object.

on_collision_exit(other)

The overlap with other ends.

• other (object): the other object.

on_destroy()

When the scene is replaced, the object is removed with studio.destroy_object() or the game closes.

on_double_clicked()

Double click on the object.

on_drag(pos)

Pointer moves while dragging.

• pos ((int, int)): pointer position in scene coordinates.

on_drag_end()

The drag ends.

on_drag_start()

A pointer drag on the object starts.

on_mouse_enter()

Pointer moves onto the object.

on_mouse_leave()

Pointer moves off the object.

on_particles_finished()

The last live particle disappeared.

on_pressed()

Left button pressed on the object.

on_released()

The button that was pressed on this object is released.

on_right_clicked()

Right click on the object.

on_start()

Once, when the scene has loaded.

on_update(dt)

Every frame.

• dt (float): seconds since the last frame.

on_visible_changed(visible)

When the object is shown or hidden.

• visible (bool): True when shown, False when hidden.