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https://github.com/outkine/pico-kit

:triangular_ruler: An opinionated set of Pico-8 helpers
https://github.com/outkine/pico-kit

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:triangular_ruler: An opinionated set of Pico-8 helpers

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# Pico-Kit :triangular_ruler:



A collection of helpers to make your life easier. Comes with four libraries:

* oop

	* `oop.class(properties?, parents?, constructor?, metatable?) -> table`



		A multi-purpose class creator that returns a table that can be called with a table of properties to generate class instances. The class's constructor is automatically generated and does the following for every parent and then current instance:

		* checks that all required properties are satisfied

		* copies over first the default properties and then the properties passed to the constructor to the instance table

		* calls the provided `constructor` argument (if it exists)



		Detailed explanation of arguments:

		* `properties`: A table of property keys/values that will be copied down to every instances. Properties with a value of `"req"` are considered unset and are required to be provided on an instance creation.

		* `parents`: A list of parents. The class's `__index` is set to these parents. Their constructors are also automatically called upon an instance creation.

		* `constructor`: A function called at the end of instance creation.

		* `metatable`: A metatable passed to every instance.



* tools

	* `tools.assign(table, initial={}) -> table`



		Similar to javascript's `Object.assign`: copies over a table to an empty table, or, if provided, an existing table.



	* `tools.assigndeep(table, initial={}) -> table`



		Similar to `tools.assign` but it iterates through tables, effectively performing a deep copy.



* debug

	* `debug.tstr(table, indent?) -> str`



		Converts a table to a string, optionally indenting each line with `indent` number of spaces.



	* `debug.print(...)`



		Prints values to the console with `printh`. If it encounters nil it prints `nil`, and if it encounters a table it uses `debug.tstr` to print out the entire table. Very useful for debugging because not only can you print multiple values at once, but `tstr` allows you to see the entire contents of even a nested table.



* physics

	* `physics.collided(body1, body2) -> bool`



		Returns whether two bodies intersect.



	* `physics.world(parameters) -> world`



		* properties



			*	`bodies={}`



			* `gravity={0, .5}` a vector that is applied with `body.shove` to every body during `world.update`, taking into consideration each bodies' `weight` and `mass`



		* `physics.world:update()`



			For each non-static body: applies gravity, friction, checks for collisions and then updates the position. Call this every frame.



		* `physics.world:addbody(body) -> body`



			Adds a body to the world and returns it.



	* `physics.body(parameters) -> body`



		A single physics body.



		* properties

			* `pos="req"`

			* `size="req"`

			* `vel={0, 0}`

			* `mass={1, 1}` proportionally affects all `body.shove` and `body.slow` calls

			* `weight={1, 1}` proportionally affects all gravity applied to the body

			* `friction={.1, 0}` applied with `body.slow` every `world.update` call, proportionally affects velocity

			* `collisions={}` a list of object collisions, reset during `world.update` call

			* `static=false` a static object that is ignored during `world.update`

			* `layer=0x1` a binary field that represents collision layers. Every `world.update` calls a `band` operation between two bodies' `layer` properties determines whether they will be checked for a collision.



		* `physics.body:update()`



			Adds the current velocity to the position.



		* `physics.body:shove(vector)`



			For x and y, adds the vector multiplied by `body.mass` to the current velocity.



		* `physics.body:slow(vector)`



			For x and y, subtracts the vector multiplied by `body.mass` from the current velocity. If the result of this operation crosses 0, the velocity on the corresponding axis is set to 0.



		* `physics.body:checkcollided(body)`



			For x and y, checks if the current body and provided body would have collided with that axis of the body's velocity, and if so:



			 * Adds the provided body to `body.collisions`.

			 * Adjusts the body's position on that axis to the edge of the provided object.

			 * Sets that axis of the body's velocity to 0.



## Setting up

To use this library, just download the `starter.p8` file and open it in Pico. Check out `example.p8` for a little example game.



## Contributing

Suggested edits are welcome! Just create a pull request and make sure to edit both the starter and example files.