possible to restict startDrag to a path? 1

[firegambler]

Hi out there!
Is it possible to make an object movable by a startDrag() function and restrict the movements to a certain path (maybe a line shaped like a wave or something) or is there some sophisticated way to get the same result?
look at these files;

http://www.weinbau-neumayer.net/tek-tips/scrollbar.zip

the scrollbar looks pretty funny but the way it is done terrifies me a little. there must be some easier way around this... any suggestions?

thanks in advance

regards

 

[billwatson]

just an idea but how about using the shape that you want to constrict the drag to (maybe invisible) and then do a hittest on that.

 

[wangbar]

You could map out a path mathematically and then position an object along it according to mouse position but you're restricted to a set of path shapes wheich can be described by a formula.

Other than that you could create an array which carries a set of values for _x position and use the mouse _y position as an index to that array.

Hmmm...

 

[wangbar]

Here's one that keeps a clip restricted to a sine wave with the horizontal position lined up to the mouse when you press the mouse (you'll need a clip on the stage with instance name 'ball'):

//variables
_global.scaleFactor = 100;
//functions
convert = function (val) {
	// convert degrees to radians
	return val/180*Math.PI;
};
trackMouse = function () {
	// get mouse position - then track along a sine wave
	var x = _xmouse;
	newX = convert(x);
	y = Math.sin(newX)*scaleFactor;
	ball._x = x;
	ball._y = y;
};
//call functions on drag
this.onMouseDown = function() {
	this.onEnterFrame = trackMouse;
};
this.onMouseUp = function() {
	this.onEnterFrame = null;
};

 

[billwatson]

quick google search came up with this script for dragging in a circle

onClipEvent (load) {
xbar = this._x;
ybar = this._y;
}
onClipEvent (mouseDown) {
mdown=true;
}
onClipEvent (mouseUp) {
mdown=false;
}
onClipEvent (enterFrame) {
if (mdown) {
this._rotation =
(Math.atan(((_root._xmouse-xbar))/((-_root._ymouse+ybar))))*360/2/Math.PI;
}
}

 

[firegambler]

thanks guys i'll try to play around with this a little

regards