Re: [Flashcoders] scribbling an oval
This is what I'm trying to accomplish: http://webkitchen.be/downloads/ scribble.jpg Thanks for your help, Serge Can you give us an example of the visual effect you're looking for? The simplest I can think of is a kind of 'ribbon' shape, like an oval but with two ends crossing over - this is a fairly classic way to show the kind of ring someone might draw around eg. a job ad. That wouldn't be too hard to describe mathematically. Danny ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] scribbling an oval
This is what I'm trying to accomplish: http://webkitchen.be/downloads/ scribble.jpg Thanks for your help, Serge Okay. In that case I think you're best off drawing an ordinary ellipse (or possibly a rounded rectangle) but adding some error factor. If you're starting from an ellipse, here's what I'd do: set a and b to the half-axes of the ellipse (I'm assuming the centre is (0,0)) set errorFactor to some small value set wobbliness to some very small value for q varying between 0 and some angle greater than 2*pi (yours seem to go round about three times, so q would go up to about 6*pi) set truePoint to (a*sin(q), b*cos(q)) set normal to (-a*cos(q), b*sin(q)) draw the point (truePoint + errorFactor * normal) set errorFactor to errorFactor + some number between -wobbliness and wobbliness I'll test it out, but that sounds like the right kind of idea to me. Danny ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] scribbling an oval
Right... That does make sense except for the draw the point... Shouldn't that have an X and Y coordinate? It does: it's the sum of two other points with an x and y coordinate. I'm mostly a Director person so these vector sums are done natively: Flash doesn't do anything so useful. But hopefully this should work. I've just tested it in Lingo, and it works pretty well. If it's any help, I've attached the code here. Translating to actionScript shouldn't be too hard. on drawWobble a, b, wobbliness if voidp(b) then b=random(100)+10 if voidP(a) then a=random(100)+10 if voidP(wobbliness) then wobbliness=(a*a+b*b)/1000.0 -- seems to give pretty good results pts=[] errorFactor=0 mx=random(100)+50 repeat with i=0 to mx q=i*8*pi/100 -- average of four loops p=point(a*sin(q), b*cos(q)) norm=point(b*sin(q) , a*cos(q)) norm=norm/sqrt(norm[1]*norm[1]+norm[2]*norm[2]) -- make it unit length pts.add(p+norm*errorFactor) errorFactor=errorFactor+random(100)*wobbliness*0.01-wobbliness/2 if abs(errorFactor)10 then errorFactor=errorFactor*0.95 -- hold it in if deviating too far end repeat -- add drawing code here end HTH Danny ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] scribbling an oval
Are you trying to position an animated movieClip Serge, or use the drawing API to draw scribbles? Because it sound like the suggestions you're getting are the latter solution. S On 28 Dec 2005, at 12:55, Serge Jespers wrote: Hey guys, I'm kinda stuck here... so any help is appreciated. I'm on this project that has a menu that when you mouse over the currently selected menu item gets scribbled around. Since this is a variable menu, I thought I'd make that oval- scribbling dynamic and random. So now I'm trying to make a function that returns the next (random) coordinate for my oval shaped scribble but that's where I got stuck. I'm throwing the max width and max height to this function and it should just return the next coordinate and end up at a specified amount of time as a scribbled oval. Anyone have any suggestions? I really wish I paid more attention in math class now... Thanks guys, Serge ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] scribbling an oval
One final thought and then I'll shut up. If you want to make your scribble smoother, you can make the randomness 'second-order'. That is, instead of randomising the change to the error factor, you could randomise the *rate* of change of the error factor. So you now keep track of two values, errorFactor and wobbliness. At each step, you add wobbliness to errorFactor, then change wobbliness by some random amount between -wobblewobbliness and wobblewobbliness :). Another advantage of this is that it gives you greater control of what happens at the extremes: if errorFactor gets greater than a certain amount you can clamp wobbliness in the right direction for a few steps until the factor gets within reasonable bounds again. Danny ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] scribbling an oval
It's supposed to be the drawing API ;-)
Positioning an animated MC would be the easy way and I always seem to
go for the not so easy way ;-)
I got this far (ahum) http://webkitchen.be/downloads/scribble.swf
And now I need a mathematician to fix the coordinates :p
Obviously, this is totally wrong ;-) but hey... at least I'm trying
here ;-)
Oh man... I can totally see my math-teacher laughing his ass off
right now...
makeOvalCoordinates = function (w, h, p) {
if (p=1) {
nx = w/2;
ny = h/2;
} else {
if (nx= -w/2){
nx -= 10;
} else {
nx+=10;
}
if (ny=-h/2){
ny -= 10;
} else {
ny+=10;
}
}
return {x:nx, y:ny};
};
Are you trying to position an animated movieClip Serge, or use the
drawing API to draw scribbles? Because it sound like the
suggestions you're getting are the latter solution.
S
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RE: [Flashcoders] scribbling an oval
The sample you originally posted is not accessible anymore, so my take on
this might be off-base:
http://www.motiondraw.com/md/as_samples/t/CatmullRomSpline/scribbledOval.htm
l
This approach is more about 'scribbling' than Math -
First several ovals are manually drawn with this tool
http://www.motiondraw.com/md/as_samples/t/LineGeneralization/demo.html
Now each time the mouse is clicked one of the pre-recorded paths is
selected, some random is applied to its coordinates, it is smoothed again
and finally it is rendered as Catmull Rom spline:
http://www.motiondraw.com/md/as_samples/t/CatmullRomSpline/tween.html
Post again if you need more details/code!
HTH
--
Andreas Weber
motiondraw.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Serge
Jespers
Sent: Wednesday, December 28, 2005 2:44 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] scribbling an oval
It's supposed to be the drawing API ;-)
Positioning an animated MC would be the easy way and I always seem to
go for the not so easy way ;-)
I got this far (ahum) http://webkitchen.be/downloads/scribble.swf
And now I need a mathematician to fix the coordinates :p
Obviously, this is totally wrong ;-) but hey... at least I'm trying
here ;-)
Oh man... I can totally see my math-teacher laughing his ass off
right now...
makeOvalCoordinates = function (w, h, p) {
if (p=1) {
nx = w/2;
ny = h/2;
} else {
if (nx= -w/2){
nx -= 10;
} else {
nx+=10;
}
if (ny=-h/2){
ny -= 10;
} else {
ny+=10;
}
}
return {x:nx, y:ny};
};
Are you trying to position an animated movieClip Serge, or use the
drawing API to draw scribbles? Because it sound like the
suggestions you're getting are the latter solution.
S
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___
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Re: [Flashcoders] scribbling an oval
Yeah I also thought about doing pre-recorded paths but I though it was gonna look cooler if it were totally random :-) What sample are you referring to? 'cause my stuff is still online ;-) S The sample you originally posted is not accessible anymore, so my take on this might be off-base: http://www.motiondraw.com/md/as_samples/t/CatmullRomSpline/ scribbledOval.htm l This approach is more about 'scribbling' than Math - First several ovals are manually drawn with this tool http://www.motiondraw.com/md/as_samples/t/LineGeneralization/demo.html Now each time the mouse is clicked one of the pre-recorded paths is selected, some random is applied to its coordinates, it is smoothed again and finally it is rendered as Catmull Rom spline: http://www.motiondraw.com/md/as_samples/t/CatmullRomSpline/tween.html Post again if you need more details/code! HTH -- Andreas Weber motiondraw.com ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
RE: [Flashcoders] scribbling an oval
What sample are you referring to? 'cause my stuff is still online ;-) Sorry, hadn't reallized that the link had just an unwanted line-break. All fine now! Yeah I also thought about doing pre-recorded paths but I though it was gonna look cooler if it were totally random :-) Note that the pre-recorded path is just used as a 'matrix' which is then altered by random factors. I don't think that 'totally random' will work for anything but a chaotic scribble - you'll need some original 'matrix' for the shape, either constructed mathematically or drawn manually. HTH -- Andreas Weber motiondraw.com -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Serge Jespers Sent: Wednesday, December 28, 2005 3:59 PM To: Flashcoders mailing list Subject: Re: [Flashcoders] scribbling an oval Yeah I also thought about doing pre-recorded paths but I though it was gonna look cooler if it were totally random :-) What sample are you referring to? 'cause my stuff is still online ;-) S The sample you originally posted is not accessible anymore, so my take on this might be off-base: http://www.motiondraw.com/md/as_samples/t/CatmullRomSpline/ scribbledOval.htm l This approach is more about 'scribbling' than Math - First several ovals are manually drawn with this tool http://www.motiondraw.com/md/as_samples/t/LineGeneralization/demo.html Now each time the mouse is clicked one of the pre-recorded paths is selected, some random is applied to its coordinates, it is smoothed again and finally it is rendered as Catmull Rom spline: http://www.motiondraw.com/md/as_samples/t/CatmullRomSpline/tween.html Post again if you need more details/code! HTH -- Andreas Weber motiondraw.com ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
