Outline: Polygon Physics Detection Library

[TheFriendlyFoe]

Simple physics detection library I made. It is composed of polygons and detects if the lines of two polygons intersect. That means if one polygon is fully inside another then it returns false. This can be useful for things like making sure they player is staying in bounds.

Polygons can be made with arrays of points like so.

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local points = {
	{x=20, y=20},
	{x=40, y=20},
	{x=30, y=30},
	{x=30, y=40},
	{x=20, y=30},
}
myPolygon = OL.create.basic(points) --now your polygon is stored in that table

They can be rotated, moved, and scaled.

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OL.angle.rotate(myPolygon, 5) --rotates polygon by 5 degrees
OL.position.move(myPolygon, 10, 10) --moves the polygon by 10x and 10y 
OL.scale.change(myPolygon, 2) --makes the polygon twice as big

Then you can detect collisions with them.

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OL.collision.basic(myPolygon, anotherPolygon) --returns true if touching and false if not.

Everything is explained in the library next to the function.

List of functions:

OL.create.basic
OL.create.advanced

OL.collision.basic
OL.collision.advanced
OL.collision.setCustomTags
OL.collision.setTag

OL.position.set
OL.position.move
OL.position.movePoint

OL.angle.set
OL.angle.rotate
OL.angle.rotatePoint

OL.scale.set
OL.scale.change
OL.scale.changePoint

OL.draw.basic
OL.draw.advanced
OL.draw.setColorPalet
OL.draw.changeColor

Feel free to make it better and release it as your own. I don't really care what you do with this, just credit me in some small form. If anyone makes anything with this, I would love to see it.

[GVovkiv]

It's better to wrap library in module, not in global variable:

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local OL = {}
* library stuff *
return OL