Collision is a python library meant for collision detection between convex and concave polygons, circles, and points.

# collision.py

## Info

Collision is a python library meant for collision detection between convex and concave polygons, circles, and points.

### Insallation

To get the latest stable version:

pip install collision

Or to get the latest development version:

pip install https://github.com/QwekoDev/collision/archive/master.zip

## Classes

### classcollision.Vector(x, y)

A 2D vector/point class

Properties:

• x (int) or (float) - The x-coordinate
• y (int) or (float) - The y-coordinate

Methods:

##### funccopy() → collision.vec

Return a copy of the vector

##### funcset(v)

Copy another vectors values onto the vector

• v (collision.vec) - The vector to copy from
##### funcperp() → collision.vec

Return the vector rotated perpandicularly

##### funcrotate(angle) → collision.vec

Return the vector rotated the angle

• angle (int) or (float) - Radians to rotate the point
##### funcreverse() → collision.vec

Return a reversed version of the vector

##### funcnormalize() → collision.vec

Return a normalized version of the vector

##### funcproject(v) → collision.vec

Return the vector projected onto the passed vector

• v (collision.vec) - The vector to project upon
##### funcproject_n(v) → collision.vec

Return the vector projected onto a unit vector

• v (collision.vec) - The vector to project upon
##### funcreflect(axis) → collision.vec

Return the vector reflected upon the passed axis vector

• axis (collision.vec) - The axis to reflect upon
##### funcreflect_n(axis) → collision.vec

Return the vector reflected upon the passed axis unit vector

• axis (collision.vec) - The axis to reflect upon
##### funcdot(v) → int or float

Returns the dot product of the vector and another

• v (collision.vec) - The other vector for the dot product
##### funcln() → int or float

Returns the length of the vector

##### funcln2() → int or float

Returns the squared length of the vector

### classcollision.Circle(pos, radius)

A simple circle with a position and radius

Properties:

• pos (collision.vec) - The center coordinate of the circle
• radius (int) or (float) - The radius of the circle

Methods:

##### funcget_aabb() → collision.Poly

Returns the AABB bounding box of the circle

### classcollision.Poly(pos, points, angle = 0)

A convex polygon with a position, a list of points relative to that position, and an angle

Properties:

• pos (collision.vec) - The center coordinate of the circle
• points (list[collision.vec]) - A list of absolute points (each relative point + the position of the polygon.) Can not be directly edited.
• rel_points (list[collision.vec]) - A list of points relative to the position. This property should not be directly changed.
• angle (int) or (float) - The angle which the polygon is rotated. Changing this will cause the polygon to be recalculated.

Class Methods:

##### funcPoly.from_box(pos, width, height) → collision.Poly

Creates a polygon from

• pos (collision.vec) - The center coordinate of the polygon/box
• width (int) or (float) - The width of the box
• height (int) or (float) - The height of the box

Methods:

##### funcaabb() → collision.Poly

Returns the AABB bounding box of the polygon

##### funcset_points(points)

Change the base points relative to the position. After this is done, the polygon will be recalculated again. Angle will be preserved. Use this instead of editing the points property.

##### funcget_centroid() → collision.vec

Get the centroid of the polygon. The arithmatic mean of all of the points.

### classcollision.Concave_Poly(pos, points, angle = 0)

A concave polygon with a position, a list of points relative to that position, and an angle. This takes longer to collide than a regular Poly does, so only use this if your shape must be concave.

Properties:

• pos (collision.vec) - The center coordinate of the circle
• points (list[collision.vec]) - A list of absolute points (each relative point + the position of the polygon.) Can not be directly edited.
• rel_points (list[collision.vec]) - A list of points relative to the position. This property should not be directly changed.
• tris (list[collision.Poly]) - A list of triangles relative to the position on the poly that make up the concave polygon. Used for concave collisions.
• angle (int) or (float) - The angle which the polygon is rotated. Changing this will cause the polygon to be recalculated.

Methods:

##### funcaabb() → collision.Concave_Poly

Returns the AABB bounding box of the polygon

##### funcset_points(points)

Change the base points relative to the position. After this is done, the polygon will be recalculated again. Angle will be preserved. Use this instead of editing the points property.

##### funcget_centroid() → collision.vec

Get the centroid of the polygon. The arithmatic mean of all of the points.

### classcollision.Response()

The result of a collision between two objects. May optionally be passed to collision tests to retrieve additional information. At its cleared state, it may seem to have odd values. Ignore these, they are just there to make generating the response more efficient. The response should be ignored unless there is a successful collision.

Properties:

• a (collision shape) - The first object in the collision test
• b (collision shape) - The second object in the collision test
• overlap (int) or (float) - Magnitude of the overlap on the shortest colliding axis
• overlap_n (collision.vec) - The shortest colliding axis (unit vector)
• overlap_v (collision.vec) - The overlap vector. If this is subtracted from the position of a, a and b will no longer be colliding.
• a_in_b (bool) - Whether a is fully inside of b
• b_in_a (bool) - Whether b is fully inside of a

Methods:

##### funcclear() → collision.Response

Clears the Response for re-use, and returns itself

# To be finished

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This version 1.2.2

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