ProCam2D - A Custom 2D Camera Node for Godot

Overview

ProCam2D is a powerful and feature-rich custom 2D camera node designed for the Godot Engine. It aims to provide developers with a AAA-quality camera system suitable for all types of 2D games. ProCam2D is a standalone camera solution that surpasses the built-in Camera2D node, offering extensive customization and control.

Key Features

• Standalone 2D Camera: Works independently, providing advanced features out of the box.
• Extensible with Addons: Comes with three addons for mouse follow, shake, and grid movement. Developers can write their own addons to extend functionality.
• Autoload Control: The camera is controlled by an autoload called procam, making it easy to access all properties and methods from any script.
• Multiple Camera Behaviors: Includes 6 additional nodes to control various behaviors such as cinematics, magnet attraction or repulsion, zoom control, room constraints, path constraints, and target following.

Installation

1. Download or clone the ProCam2D repository.
2. Copy the ProCam2D folder into your Godot project’s addons directory.
3. Enable the ProCam2D plugin in your project settings.

Usage

Basic Setup

1. Press CTRL + A or the "+" icon on the scene tab to add a new node.

2. Type "pcam" in the search box to filter the nodes and show all 7 ProCam2D nodes.

   

3. Add a ProCam2D node to your scene.

4. Add one or more PCamTarget nodes as children of the objects you want the camera to follow.

5. Configure the camera properties and target properties via the inspector.

Example: Basic Camera Setup

extends Node2D

func _ready():
    procam.set_follow_mode(ProCam2D.FollowMode.SINGLE_TARGET)

Example: Adding Addons

Addons can be easily added to the ProCam2D node by following these steps:

1. Click on the Addons property on the inspector and increase its Array size:

   

2. Click on any [empty] fields and choose your addon from the list of resources:

   

3. Configure the addons properties:

   

If you added an addon through the inspector, you can access it like this:

func _ready():
    var shake_addon = procam.get_addons()[index] # Replace index with the index of the addon on the inspector. 
    shake_addon.shake() #Use this method to start any shake addon
    shake_addon.stop() #Use this method to stop any shake addon

To add an addon through code, use this method:

func _ready():
    var shake_addon = PCamShake.new()
    shake_addon.apply_preset(shake_addon.Preset.GUNSHOT) # This is a method available to the screenshake addon
    procam.add_addon(shake_addon)
    shake_addon.shake() # This is a method available to the screenshake addon see below for all available addons

Available addons

Addons are processed in order of their priority. from lowest to highest.

PCamShake

This addon is used to add exciting screenshakes to your game.

Enums

• ShakeType

  • VERTICAL: Shakes the screen vertically, moving up and down.
  • HORIZONTAL: Shakes the screen horizontally, moving left and right.
  • RANDOM: Generates random shakes in all directions, creating an unpredictable effect.
  • PERLIN: Uses Perlin noise to generate smooth, natural-looking random shakes.
  • ROTATE: Rotates the screen around its center point, simulating a rotational shake.
  • CIRCULAR: Shakes the screen in a circular motion, combining horizontal and vertical movement.
  • ZOOM: Simulates a zooming effect, shaking the screen by scaling in and out.

• Preset

  • GUNSHOT: A quick and sudden shake, simulating the recoil of a gunshot.
  • EARTHQUAKE: A continuous and intense shaking, mimicking the effect of an earthquake.
  • HANDHELD: Mimics the natural, unsteady movement of a handheld camera.
  • EXPLOSION: A strong and rapid shake, representing the shockwave of an explosion.
  • IMPACT: A brief, intense shake, simulating the effect of a sudden impact.
  • RUMBLE: A low-frequency, continuous shaking effect, like a deep vibration.
  • VIBRATION: A rapid, high-frequency shake, similar to a vibrating effect.
  • WOBBLY: A smooth and gentle shaking, creating a wobbly, unsteady motion.

Methods

• set_preset(preset: Preset): Sets the current shake effect to a predefined preset. E.g : set_preset(PCamShake.Preset.GUNSHOT)
• stop(): Stops the current screen shake effect immediately.
• is_shaking() -> bool: Returns a boolean indicating whether a screen shake effect is currently active.
• shake(): Initiates a custom screen shake effect based on the current settings.

PCamGrids

This addon is used to make the camera snap to grid. The snapping will be smooth or instant depending on the camera's smooth_drag property.

PCamMouseFollow

This addon adds pointer influence to the camera. Can be used for side scrollers that use the mouse for aiming or looking around.

ProCam2D Properties

Enums

• FollowMode

  • SINGLE_TARGET: The camera follows a single target with the highest priority, ideal for focusing on one main character or object.
  • MULTI_TARGET: The camera can follow multiple targets, useful for multiplayer games or scenes with multiple points of interest.

• DragType

  • SMOOTH_DAMP: Smoothly follows the target with a damping effect, providing a natural and gradual motion.
  • LOOK_AHEAD: Allows the camera to look ahead of the target's movement, enhancing anticipation in fast-paced games.
  • AUTO_SPEED: Automatically adjusts the camera speed based on the target's speed.
  • SPRING_DAMP: Uses a spring-damping effect for following the target, creating a bouncy and responsive feel.

Camera Properties

• process_mode: Controls the processing mode of the camera.
• follow_mode: int: Sets the follow mode (SINGLE_TARGET or MULTI_TARGET).
• drag_type: int: Sets the drag type (SMOOTH_DAMP, LOOK_AHEAD, AUTO_SPEED, SPRING_DAMP).
• smooth_drag: bool: Enables or disables smooth dragging.
• smooth_drag_speed: Vector2: Sets the speed of smooth dragging.
• prediction_time: Vector2: Defines the prediction time for look-ahead functionality.
• offset: Vector2: Sets the offset of the camera from the target.
• smooth_offset: bool: Enables or disables smooth offset.
• smooth_offset_speed: float: Sets the speed of smooth offset.
• allow_rotation: bool: Enables or disables camera rotation.
• smooth_rotation: bool: Enables or disables smooth rotation.
• smooth_rotation_speed: float: Sets the speed of smooth rotation.
• zoom: float: Sets the camera's zoom level.
• smooth_zoom: bool: Enables or disables smooth zooming.
• smooth_zoom_speed: float: Sets the speed of smooth zooming.
• auto_zoom: bool: Enables or disables automatic zoom adjustment to fit multiple targets.
• min_zoom: float: Sets the minimum zoom level for automatic zoom.
• max_zoom: float: Sets the maximum zoom level automatic zoom.
• zoom_margin: float: Defines the margin around targets when adjustmenting zoom automatically.
• smooth_limit: bool: Enables or disables smooth limiting of the camera's bounds.
• left_limit: int: Sets the left boundary of the camera.
• right_limit: int: Sets the right boundary of the camera.
• top_limit: int: Sets the top boundary of the camera.
• bottom_limit: int: Sets the bottom boundary of the camera.
• use_h_margins: bool: Enables or disables horizontal margins.
• use_v_margins: bool: Enables or disables vertical margins.
• left_margin: float: Sets the left margin.
• right_margin: float: Sets the right margin.
• top_margin: float: Sets the top margin.
• bottom_margin: float: Sets the bottom margin.

Public Methods

• start_cinematic(id): Starts a cinematic sequence with the given ID.
• stop_cinematic(): Stops the current cinematic sequence.
• get_camera_bounds(): Returns the current camera bounds as a Rect2.
• reset_camera(): Resets the camera to its target position, rotation and zoom.
• add_addon(addon: PCamAddon): Adds an addon to the camera.
• get_addons() -> Array: Returns an array of all attached addons.
• remove_addon(addon: PCamAddon): Removes an addon from the camera.
• set_position(new_position: Vector2): Sets the camera's position.
• set_rotation(new_rotation: float): Sets the camera's rotation.
• set_zoom(new_zoom: float): Sets the camera's zoom level.

Signals

• cinematic_started(cinematic_id): Emitted when a cinematic sequence starts.
• cinematic_stopped(cinematic_id): Emitted when a cinematic sequence stops.
• addon_message(message): Emitted when an addon sends a message.

Additional Nodes

PCamTarget

A node that the camera follows. It can be placed as a child of a player. Multiple targets can be placed.

Properties

• priority: int: Determines the active target when follow mode is set to SINGLE_TARGET. Higher priority targets are followed.
• radius: float: Defines the target area for auto-zoom functionality.
• offset: Vector2: Sets the positional offset of the target.
• influence: Vector2: Determines how much the target influences the camera movement. Values range from 0 (no influence) to 1+ (full influence).
• rotation_influence: float: Determines how much the target's rotation influences the camera. Values range from 0 (no influence) to 1+ (full influence).
• disable_outside_limits: bool: The camera stops following this node once it goes beyond it's limits.

PCamCinematic

Defines a point in a cinematic sequence. PCamCinematic nodes with the same id form a cinematic sequence which can be played with procam.start_cinematic(id)

Properties

• cinematic_id: string: Identifier for the cinematic sequence, used to start and stop specific cinematic events. Can be an integer or string.
• hold_time: float: Duration in seconds for which the camera holds the cinematic state before transitioning.
• target_zoom: float: Desired zoom level during the cinematic sequence.
• drag_speed: Vector2: Speed at which the camera follows the target during the cinematic, affecting how quickly it drags to the new position.
• rotation_speed: float: Speed of camera rotation during the cinematic, controlling how quickly the camera rotates to match the PCamCinematic's rotation.
• zoom_speed: float: Speed at which the camera zooms in or out during the cinematic.

PCamMagnet

Attracts or repels the camera like a magnet.

Properties

• magnet_shape: MagnetShape: Defines the shape of the magnetic influence area. Options include CIRCLE or RECTANGLE.
• attract_repel: AttractRepel: Determines whether the magnet attracts or repels the camera. Options include ATTRACT or REPEL.
• radius: float: Radius of the influence area when magnet_shape is set to CIRCLE.
• rectangle_size: Vector2: Size of the influence area when magnet_shape is set to RECTANGLE.
• use_full_force: bool: Enables or disables full force application within the influence area.
• force: Vector2: Defines the strength of the force applied to the camera when within the influence area, if use_full_force is disabled.
• falloff_curve: Curve: A curve defining how the force diminishes with distance from the center of the influence area, if use_full_force is disabled.

Signals

• magnet_entered(): Emitted when the camera enters the magnet's area of influence
• magnet_exits(): Emitted when the camera exits the magnet's area of influence

PCamZoom

Changes the zoom of the camera within its area of influence.

Properties

• zoom_shape: ZoomShape: Defines the shape of the zoom influence area. Options include CIRCLE or RECTANGLE.
• radius: float: Radius of the influence area when zoom_shape is set to CIRCLE.
• rectangle_size: Vector2: Size of the influence area when zoom_shape is set to RECTANGLE.
• zoom_factor: float: Factor by which the camera zooms in or out when within the influence area.
• gradual_zoom: bool: Enables or disables gradual zooming when entering or exiting the influence area.

Signals

• zoom_area_entered(): Emitted when the camera enters the zoom's area of influence.
• zoom_area_exited(): Emitted when the camera exits the zoom's area of influence.
• zoom_level_changed(): Emitted when the zoom's zoom level changes.

PCamRoom

Constrains the camera to an area it covers.

Properties

• room_size: Vector2: Defines the dimensions of the room or constrained area that the camera is limited to.
• zoom: float: Sets the zoom level within the constrained room area.
• open_sides: BitMask: Specifies which sides of the room are open (left, right, top, bottom). Checkboxes for each side allow for customizable room constraints.

Signals

• room_entered(room): Emitted when the camera enters the room.
• room_exited(room): Emitted when the camera exits the room.

PCamPath

Constrains the camera to a path on a specified axis.

Properties

• constraint_axis: AxisConstraint: Defines which axis (X or Y) the camera is constrained to follow along the path. Options include X and Y.

Addons

ProCam2D is designed to be extensible. You can create your own addons to add custom functionality to the camera.

Writing Your Own Addon

Creating an addon for the camera system involves extending the PCamAddon class. This class provides a standardized way to modify camera behavior in different stages: pre_process, post_smoothing, and final_adjust. Each stage allows you to adjust the camera's properties at different points in the update cycle.

Addon Structure

An addon inherits from the PCamAddon class and should implement the following methods:

1. setup(camera): Called when the addon is initialized. Use this method to set the initial state or configurations, such as defining the stage in which the addon operates.
2. exit(camera): Called when the addon is disabled or removed. Use this to clean up or reset any changes made by the addon.

In addition to these lifecycle methods, an addon should override one of the following methods to define its behavior during a specific stage:

• pre_process(camera, delta): This method is used for modifications to the camera's target properties before any smoothing is applied. It’s ideal for setting _target_zoom, _target_rotation, and _target_position of the passed in camera.

• post_smoothing(camera, delta): This method is used for adjustments after the camera’s target properties have been smoothed but before final adjustments. It’s ideal for setting _current_zoom, _current_rotation, and _current_position of the passed in camera.

• final_adjust(camera, delta): This method allows for final modifications to the camera's properties after all other processing. It is often used for post-processing effects or final tweaks.

Properties

• Target Properties: These are properties adjusted during the pre_process stage. They include _target_zoom, _target_rotation, and _target_position.
• Current Properties: These are properties adjusted during the post_smoothing or final_adjust stages. They include setting _current_zoom, _current_rotation, and _current_position of the passed in camera.

Sample Addon: Grids

This addon aligns the camera's target position to a grid, ensuring that movement snaps to predefined intervals.

tool
extends PCamAddon
class_name PCamGrids

export var grid_size := Vector2(64, 64)
export var grid_offset := Vector2.ZERO

func setup(camera):
	stage = "pre_process"

func pre_process(camera, delta):
	# Snap the target position to the grid and apply an offset if needed
	var snapped_target = camera._target_position.snapped(grid_size) + grid_offset
	camera._target_position = snapped_target

The addon will now show up on the list of resources. You can then add it to the camera through the inspector or like so:

var grid_addon = PCamGrids.new()
func _ready() -> void:
    procam.add_addon(grid_addon)

Implementing a New Addon

To create your own addon:

1. Define the Addon: Extend PCamAddon and set up any necessary properties or export variables.
2. Set Up Stages: Use the setup method to specify the stage in which the addon should operate. Implement the corresponding method (pre_process, post_smoothing, or final_adjust) to define the addon's behavior.
3. Enable the Addon: Ensure your addon is enabled by setting the enabled property to true.

This framework provides a flexible way to modify camera behavior by compartmentalizing changes into different processing stages.

Support

If you find ProCam2D useful and would like to support its development, consider buying me a coffee:

Contributing

Contributions are welcome! For detailed instructions on how to contribute, please see our Contributing Guide.

Reporting Bugs or Requesting Features

To report a bug or request a feature, please use the Issues section of this repository. Make sure to follow the templates provided for better clarity and organization.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Thank you for using ProCam2D! If you have any questions or need further assistance, feel free to reach out.