round up/down to nearest 90 degrees.

Hi guys.

I have a graphic (arrow) which spins round on the same spot pointing to wherever the mouse go's.

Instead of the arrow pointing to every single angle (360 degrees) I want it to either point up, down, left or right. I think it might need rounding up/down some how to the nearest 90 degrees?

Here's my code that I use just to spin the arrow graphic.


onClipEvent (load) {
_x += Number(2);
friction = .7;
speedratio = .2;
xspeed = 0;
yspeed = 0;
xgoal = this._x;
ygoal = this._y;
}
onClipEvent (enterFrame) {
// figure out our slope
var slope = (_root._ymouse-_y)/(_root._xmouse-_x);
// get it in usable form...
var radians = Math.atan(slope);
var theta = (radians*180)/Math.PI;
theta += (_root._xmouse<_x) ? 180 : 0;
// set the rotation
_rotation = theta;
}



Can anyone help?? Much appreciated.

Hi, this should do it:

You can use Math.floor(theta) or Math.ceil(theta) if you need to round it up/down. I wrote the above here so I havent tested it. Not sure if theta would == 0 || 360..think its zero though.

It stopped working Tann, obviously it never got into the if statement. I was thinking, the arrow is pointing to 4 different images. Could I reference it to them and say something like:
if mouseOver image1
begin
rotate arrow x degrees
end
If so how????

Hi, yer that would definately work. The easiest and quickest way would be to make each of the four images into a button. Just manually do it. Then for each button use:

on(rollOver)
{
myArrow._rotation = 0;
myArrow._rotation = 90;
myArrow._rotation = 180;
myArrow._rotation = 270;
}

Obviously you only use one of those four statements for each button, which one depends on the angle your arrow starts in i.e. up, left etc...

If you have dynamically loaded the images then you should definately look into assigning mouse events that way otherwise dont worry about it.

I'll give that a shot now. Cheers tan.