ActionScript 3.0 :: Intersection Of Two Vectors Using Perpendicular Product
Jun 11, 2011
I am currently working my way through a book on Game Programming in Actionscript 3, and have gotten to a formula required for collision detection on finding the intersection point of two vectors. Im not sure if the author uses vectors in the strictest definition, but the convention he uses is e.g for a vector V1 :
V1.a is the start point of the vector V1.b is the end point of the vector V1.ln is the vector perpendicular to V1 (its 'left normal') V1.vx is the difference between the x coordinate of V1.b and V1.a V1.vy similar to vx V1.dx is the same as vx , but for V1 scaled down to a unit vector (the direction vector) Now,in the example we have V1 which is the motion vector of the ship, and V2, which is the target vector (i.e the line the ship is going to collide with at some point)
In order to calculate at what point on V2 the ship will collide travelling along motion vector V1, the book gives the following code using the "perpendicular dot product" (Which i have not come across before) and creating a third vector V3 between the start point of V1 and the start point of V2 (V1.a and V2.a):
[Code]...
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as possible because I'm having a competition of some sort of..... In Flash Action Script Language Form the code of Vector Intersection will be in this way:
Code:
v3={vx:v2.p0.x-v1.p0.x, vy:v2.p0.y-v1.p0.y};
var t=perP(v3, v2)/perP(v1, v2);
[code]....
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[Code]...
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[Code]...
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[Code]....
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[Code]....
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