[snippet]IsPointOnLine

[Nestharus]

function IsPointOnLine takes real m, real b, real x, real y returns boolean
    return y == m*x+b
endfunction

 

[SanKakU]

how can anyone understand it if you don't explain what m, b, x and y are?

 

[Nestharus]

how can anyone understand it if you don't explain what m, b, x and y are?

http://www.analyzemath.com/line/Tutorials.html

 

[Bribe]

Is point on line, should allow you to define a line using coordinates, instead of leaving this ambiguous m and b.

function IsPointOnLine takes real x, real y, real x1, real y1, real x2, real y2

Whereas x and y are the point in question, x1,y1 is start of the line and x2, y2 is the end of the line.

The way you have it set up is more like IsPointIntersectingAngle.

 

[13lade619]

there's like no degree of error on this.. the point must be spot on.

how about making it accept a radius? like if point xy is r away from line.

 

[Nestharus]

@Bribe
y=(y2-y1)/(x2-x1)x+b

...

@13lade619

how about making it accept a radius? like if point xy is r away from line.

There is another snippet to see if a line intersects a circle ; ). You could also do PointOnRectangle or CircleIntersectsRectangle. This happens to be PointOnLine ^_-.

 

[Bribe]

m = (y2-y1)/(x2-x1)

y == m*x + ??

What the heck is b?

 

[Nestharus]

read tut I linked http://www.analyzemath.com/line/Tutorials.html

c'mon guys, this is simple algebra >.>

 

[Bribe]

Nes,

If we have already calculated the intercept and slope, then we have absolutely no use for a function like this. This function should do the math automatically to make it less abstract and more like a practical WC3 setup.

 

[Nestharus]

It's not abstract at all... >.>

I suppose it's only ever useful if someone doesn't know the equation of a line ^_-.

Furthermore, if you want a function to calculate slope, make one ; D

function GetSlope takes real x1, real y1, real x2, real y2 returns real
    return (y2-y1)/(x2-x1)
endfunction

This is really simple math though, and very few wuold benefit from this ^_-, but there are those who are in HS and even graduate and still don't know this stuff, soo.. ;o

 

[Bribe]

I learned Algebra in 2000/2001, and haven't seen the y==mx+b equation since then. I have yet to find an application for that formula in my daily life, unlike Trigonometry and Geometry.

 

[Nestharus]

Well, there is application for it in games.

 

[SanKakU]

if you understand what mbxy are from the link, good for you. i still don't get it.

 

[Bribe]

Approved to the snippets thread.