Hugh,
You'll love the atan2 function. It takes care of all nasty bits at 90 and 270
degrees as well as dealing with the quadrants issues.
Use atan2(y,x) for angles measure clockwise from the x-axis
Use atan2(-y,x) for angles measure counterclockwise from the x-axis.
Jim Hurley
--| Get the p
For those who do not have LC5 or AE (ideas already suggested), here is a
solution to detect whether a point is within the filled area of an oval
graphic using polar geometry. It is offered as a starting point for a more
compact solution.
on mouseUp
--| Syntax: isWithinSegment(long ID,point)
pu
On 11/13/11 8:47 AM, James Hurley wrote:
Jacque,
BOL! (Burst out laughing)
This may be more recognizable, the equation for the ellipse in
rectangular coordinates:
x^2 + y^2
- - = 1
a^2 b^2
Just replace x by r*cos(theta) and y by r*sin(theta) and solve for r. Voila.
Oh, forgot to mention. The really cool thing about the collision listener
is if you have overlapping graphics, it will list all of them as
collisions. AE5 is just too cool.
On Sun, Nov 13, 2011 at 8:43 AM, Mike Bonner wrote:
> Just tried doing the detection using AE5 and it works like a champ.
Just tried doing the detection using AE5 and it works like a champ.
With the collisionListernerDemo, a couple really simple changes gets the
job done.
in the card script I added the following:
command startMove
if tMoving is empty then put false into tMoving
--put false into tMoving
By the way, to see how different the startAngle is from the polar angle, make a
very wide oval with a very small height.
Set the startangle to 45 degrees and the arcangle to say 250. The start angle
appears to be about 10 degrees.
___
use-livecode mail
Jacque,
BOL! (Burst out laughing)
This may be more recognizable, the equation for the ellipse in rectangular
coordinates:
x^2 + y^2
- - = 1
a^2 b^2
Just replace x by r*cos(theta) and y by r*sin(theta) and solve for r. Voila.
Well maybe not. Foreign languages are not d
oops. accidental send on that last one. Clumsy day for me! As I was
saying, if you use AE5 and drag around a pixel at the mouseloc the
collision detection stuff in AE5 should make this a piece of cake.
On Sun, Nov 13, 2011 at 6:51 AM, Mike Bonner wrote:
> This is probably a silly idea, but.. if
This is probably a silly idea, but.. if you have AE 5 with its collision
detection, maybe you can drag a hidden pixel around at the mouseloc and set
your ovals up to detect collisions. At which point a message is sent with
all the
___
use-livecode mailing
unds.
within(object,point,"pixels")
Kind regards
Bernd
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_
James,
"Magnifique*!
Pierre
Le 13 nov. 2011 à 07:01, James Hurley a écrit :
> Hugh,
>
> Would this help? The script below will draw a polygon that looks like an
> ellipse with a start and stop angle.
>
> The trouble with the start angle and the arcangle in RR is that they are not
> polar an
On 11/13/11 12:01 AM, James Hurley wrote:
function r tA --Radial distance to the ellipse as afunction of the angle
put (cos(tA*pi/180))^2 / (a*a) + (sin(tA*pi/180))^2 / (b*b) into temp
return 1/sqrt(temp)
end r
This means something, right? Well, for your information I happen to know
h
Hugh,
Would this help? The script below will draw a polygon that looks like an
ellipse with a start and stop angle.
The trouble with the start angle and the arcangle in RR is that they are not
polar angles but are related in a complex way:
arcAngle = arctangent( b/a * tangent(polarangle)
(Don
ld 1
end if
end mouseWithin
---
it works but it is a more of a hack.
maybe someone has a better solution...
Kind regards
Bernd
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Yes, it would... but a gradient wasn't mentioned... we could throw spanners
into the works all night!
> From: gboj...@gmail.com
> Date: Sat, 12 Nov 2011 13:34:32 -0700
> Subject: Re: mouse within oval filled area
> To: use-livecode@lists.runrev.com
>
> This would be very
inside the coloured bit of control ID no" && the short id
> of me
> end if
> end mouseWithin
>
>
>
> > From: ad...@flexiblelearning.com
> > To: use-livecode@lists.runrev.com
> > Subject: RE: mouse within oval filled area
> > Date: Sat, 12 No
ivecode@lists.runrev.com
> Subject: RE: mouse within oval filled area
> Date: Sat, 12 Nov 2011 19:25:16 +
>
> Indeed, John, but not a unique object identifier if more than one grc uses
> the same color. I think I am back to polar coordinates (unfortunately).
>
> The curre
Indeed, John, but not a unique object identifier if more than one grc uses
the same color. I think I am back to polar coordinates (unfortunately).
The current engine behaviour is painfully inconsistent with other controls
whose transparency is immune from mouse events.
Hugh Senior
FLCo
John Dix
Sorry to flood the list.. but nevermind… I double-checked and that idea doesn't
help you….
On Nov 12, 2011, at 9:56 AM, Randy Hengst wrote:
> Hi Hugh,
>
> I haven't done exactly as you describe, but have made things where I only
> wanted a response when the user clicked the filled area of a gr
Hi Hugh,
I haven't done exactly as you describe, but have made things where I only
wanted a response when the user clicked the filled area of a graphic.
I used the function version of within….
This script in the graphic….
on mouseUp
if within(graphic "myGraphic",the mouseLoc) then
bee
Use the mouseColor ?
> From: ad...@flexiblelearning.com
> To: use-livecode@lists.runrev.com
> Subject: mouse within oval filled area
> Date: Sat, 12 Nov 2011 11:59:33 +
>
> Has anyone worked out how to test if the mouseLoc is within the filled area
> of an ova
Has anyone worked out how to test if the mouseLoc is within the filled area
of an oval graphic (defined by startAngle and arcAngle)? I was thinking
polar coordinates, but this assumes a circle and a fixed radius which is not
necessarily the case. A btter math brain than mine is needed!
Hugh Senior
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