Function
Shape:testSegment( x1, y1, x2, y2 )
Checks whether a line segment intersects a shape. This function will either return the "time" of impact and the surface normal at the point of collision, or nil if the line does not intersect the shape. The "time" is a value between 0.0 and 1.0 and can be used to calculate where the collision occured.
Synopsis
t, xn, yn = Shape:testSegment( x1, y1, x2, y2 )
Parameters
x1 number The x-component of the first endpoint.
y1 number The y-component of the first endpoint.
x2 number The x-component of the second endpoint.
y2 number The y-component of the second endpoint.
Returns
t number The time of impact, or nil if no impact.
xn number The x-component of the surface normal.
yn number The y-component of the surface normal.
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