Android Question x,y inside a path??

[ilan]

hi

i am creating a path (no specific shape, could be triangle, rect,..)

and in activity touch i would like to know if my x,y are inside that path

is that possible?

do we have some good math experts here?

 

[klaus]

You may have a look at this: PointInAPolygone

 

[ilan]

You may have a look at this: PointInAPolygone

this is awesome, thank you @klaus

 

[JordiCP]

Algorithm-less tricky way

Create a mutable bitmap with the same dimensions as the view you are showing. No need to attach it to a view. Initialize a canvas to it. Clip the path and fill it Red. When you want to see if X, Y is inside the path, just check the color of this point in the bitmap

(Surprisingly, it also works for other colors )

 

[ilan]

Algorithm-less tricky way

Create a mutable bitmap with the same dimensions as the view you are showing. No need to attach it to a view. Initialize a canvas to it. Clip the path and fill it Red. When you want to see if X, Y is inside the path, just check the color of this point in the bitmap

(Surprisingly, it also works for other colors )

i prefer klaus solution. the get pixel color function is to weak for my needs

but thank you anyway

 

[JordiCP]

i prefer klaus solution

Me too. I love maths