Poolology calculator tool

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zxzlsh

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Link

I'm fan of Poolology but i hate math, if you are same as me this tool might save your time.
This website is mobile friendly.
Any suggestions or comments to improve the calculator are welcome.
 
zxzlsh said:


Link

I'm fan of Poolology but i hate math, if you are same as me this tool might save your time.
This website is mobile friendly.
Any suggestions or comments to improve the calculator are welcome.
Click to expand...

Very nice. I have a friend making an app just like this. Great work. For anyone with the book this is a great tool.
 
zxzlsh said:


Link

I'm fan of Poolology but i hate math, if you are same as me this tool might save your time.
This website is mobile friendly.
Any suggestions or comments to improve the calculator are welcome.
Click to expand...

Good job on the calculator tool... Thanks for sharing.

.
 
This is nice. For me, just putting 8 in the bottom, then putting 1,2,3,4,5,6,7 in the top clearly shows all the 1/8the aim point. Well done.


Sent from my iPhone using Tapatalk
 
Very useful! Here's an additional idea:

Don't know how difficult this would be to implement, but...

Have you seen how the Break Speed app allows the user to tell the app where he has placed the cue ball for the break?

A similar technique could allow the Poolology user to show the locations of the OB and the CB and indicate the target pocket.With this information, the app would be able to determine the proper overhang.
 
Saturated Fats said:
Don't know how difficult this would be to implement, but...

Have you seen how the Break Speed app allows the user to tell the app where he has placed the cue ball for the break?

A similar technique could allow the Poolology user to show the locations of the OB and the CB and indicate the target pocket.With this information, the app would be able to determine the proper overhang.
Click to expand...

Already thought of that, and my programming buddy is working on it. I told him not to include any actual alignment values or position lines on the table in the app or I'd have to put a price on it because it would basically be a virtual copy of the book. I would like the app to be free. Like zxzlsh's web calculator, it'll be a great workable tool for those interested.
 
BC21 said:
Already thought of that, and my programming buddy is working on it. I told him not to include any actual alignment values or position lines on the table in the app or I'd have to put a price on it because it would basically be a virtual copy of the book. I would like the app to be free. Like zxzlsh's web calculator, it'll be a great workable tool for those interested.
Click to expand...

It's an easy calculation for a computer too! I cooked this up the other day, you can pass it along to your buddy. It's just straight geometry and doesn't take into account the physics of the shot (throw, english, etc).

Code: 
# calc_aim: calculate the percent overhang given x,y coordinates of the cue ball, object ball, target
#  cb = Vector[x, y] absolute coordinates of cue ball
#  ob = Vector[x, y] absolute coordinates of object ball
#  p = Vector[x, y] absolute coordinates of pocket
def calc_aim( cb, ob, p )
  #1) calculate the vector ob travels from ob to p
  sv = (p - ob).normalize

  #2) ghost ball (gb) is 1 ball diameter from ob in the opposite direction of sv
  gb = ob + (sv*-1)*1.balls  # 1.balls = 2.25"

  #3) the shortest distance (d) from the ob to the line that passes through cb and gb
  d = dist_line_to_point(cb, gb, ob)

  #4) d / 1 ball diameter = % overhang
  d / 1.balls
end

def dist_line_to_point( ep1, ep2, p)
  # Line defined by two points:
  # distance(P1, P2, (x0, y0)) = ( (y2-y1)*x0 - (x2-x1)*y0 + x2*y1 - y2*x1 ).abs / Math.sqrt( (y2-y1)**2 + (x2-x1)**2 )
  # Where:
  #   P1 = a point on the line (x1, y1)
  #   P2 = a point on the line (x2, y2)
  #   (x0, y0) = the point we're finding the distance from the line
  # https://en.wikipedia.org/wiki/Distance_from_a_point_to_a_line
  x0 = p[0]
  y0 = p[1]
  x1 = ep1[0] 
  y1 = ep1[1]
  x2 = ep2[0] 
  y2 = ep2[1] 
  ( (y2-y1)*x0 - (x2-x1)*y0 + x2*y1 - y2*x1 ).abs / Math.sqrt( (y2-y1)**2 + (x2-x1)**2 )
end
 
Last edited:
SkinnyPete said:
It's an easy calculation for a computer too! I cooked this up the other day, you can pass it along to your buddy. It's just straight geometry and doesn't take into account the physics of the shot (throw, english, etc).

Code: 
# calc_aim: calculate the percent overhang given x,y coordinates of the cue ball, object ball, target
#  cb = Vector[x, y] absolute coordinates of cue ball
#  ob = Vector[x, y] absolute coordinates of object ball
#  p = Vector[x, y] absolute coordinates of pocket
def calc_aim( cb, ob, p )
  #1) calculate the vector ob travels from ob to p
  sv = (p - ob).normalize

  #2) ghost ball (gb) is 1 ball diameter from ob in the opposite direction of sv
  gb = ob + (sv*-1)*1.balls  # 1.balls = 2.25"

  #3) the shortest distance (d) from the ob to the line that passes through cb and gb
  d = dist_line_to_point(cb, gb, ob)

  #4) d / 1 ball diameter = % overhang
  d / 1.balls
end

def dist_line_to_point( ep1, ep2, p)
  # Line defined by two points:
  # distance(P1, P2, (x0, y0)) = ( (y2-y1)*x0 - (x2-x1)*y0 + x2*y1 - y2*x1 ).abs / Math.sqrt( (y2-y1)**2 + (x2-x1)**2 )
  # Where:
  #   P1 = a point on the line (x1, y1)
  #   P2 = a point on the line (x2, y2)
  #   (x0, y0) = the point we're finding the distance from the line
  # https://en.wikipedia.org/wiki/Distance_from_a_point_to_a_line
  x0 = p[0]
  y0 = p[1]
  x1 = ep1[0] 
  y1 = ep1[1]
  x2 = ep2[0] 
  y2 = ep2[1] 
  ( (y2-y1)*x0 - (x2-x1)*y0 + x2*y1 - y2*x1 ).abs / Math.sqrt( (y2-y1)**2 + (x2-x1)**2 )
end
Click to expand...

Excellent! You guys are too smart to be be pool players! Lol:D

Just keep in mind that the system does begin to lose accuracy around that 1/8 of a ball hit, primarily when the ob is directly on a line dividing two different zones. If you have reasonable CB control (doesn't have to be perfect) you can easily keep your shots within the system's parameters. But after a while you'll find yourself not even looking at the numbers.
 
Though I like the calculator tool and my buddy's app idea, I have to say no fractional math is really needed in order to find the aim ponts. Simple visual references work just fine. Watch this clip to see how to do it....

https://youtu.be/KE0C_q2Y0ic
 
BC21 said:
Already thought of that, and my programming buddy is working on it. I told him not to include any actual alignment values or position lines on the table in the app or I'd have to put a price on it because it would basically be a virtual copy of the book. I would like the app to be free. Like zxzlsh's web calculator, it'll be a great workable tool for those interested.
Click to expand...
Why not do that?

Sent from my SAMSUNG-SM-N920A using Tapatalk
 
JB Cases said:
Why not do that?

Sent from my SAMSUNG-SM-N920A using Tapatalk
Click to expand...

I keep ping-ponging back and forth on it. On one hand I like the concept and see the benefit. On the other hand I feel like it would deprive a player of developing an eye for shots, choosing to calculate everything instead of visualize. Sort of like teaching someone basic math by handing them a calculator. :o
 
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