Circle vs pie segment collision detection

[paul_nicholls]

hmm...the code seems to be returning true for me most of the time, so I get flickering energy discharges at the target as it thinks the circle and pie are intersecting lots...

I am setting up the circle and pie like this:

    BeamHasHitPlayer := False;

    if Assigned(FPlayer) then
    begin
      Circle.c := G2Vec2(FPlayer.x,FPlayer.y);
      Circle.r := FPlayer.Width * 0.4;

      Pie.c := G2Vec2(aSentry.x,aSentry.y);
      Pie.r := aSentry.BeamRange;
      Pie.AngStart := aSentry.Angle - aSentry.BeamWidth/2;
      Pie.AngEnd   := aSentry.Angle + aSentry.BeamWidth/2;

      BeamHasHitPlayer := CircleVsPieIntersect(Circle,Pie);
    end;

Any ideas?

If it helps, the beam width is 50 degrees wide, and the screen coordinate system being used is this (if it makes a difference?):

0,0
+----------------------  +X
|
|
|
|
|
|
|

+Y

cheers,
Paul

[Dan]

The function assumes that the angles are in radians so you might need to multiply your degree angles by (Pi / 180).
EDIT: Here's my test app.

[paul_nicholls]

The function assumes that the angles are in radians so you might need to multiply your degree angles by (Pi / 180)

<Drumroll...> that was it...it is now working, sweet!! thanks mate

<gives a beer>

Now that it is working, I might convert the function to use my plain, vanilla records so lesser versions of Delphi can compile the code too

cheers,
Paul

[Dan]

it was an interesting problem to solve.

[paul_nicholls]

Here is a picture of the Sentry zapping the user character



Thanks again

cheers,
Paul