Rotating vector

Question

Hi guys!Well, my problem is not really program-related, it's more math related (math was never my strong side) and I thought maybe someone here could help me out...Lets says I have 2 points in the X-Y plane: A(180,180) , B(310,310), now I craete a vector from B to A: V=(-180 , -180).Now, I need to rotate that vector around point B at 1 degree intervals (in an OnEnterFrame event).I cant seem to figure out the math required...can someone please help me out?Thank you!

kglad · Accepted Answer

A defines the location of a blitted object which is on stage (though I don't see how it matters).

Its not a problem of displaying them on the stage, it's a pure math problem; Consider A and B to be invisible points in the plane, and A need to circle B in a fixed radius.

It really is't even complex math, I'm missing something I can't seem to find what :/

use:

var A:Point = new Point(180,180);

var B:Point = new Point(310,310);

var angle:Number = Math.atan2(-130,-130);

var L:Number = Math.sqrt(130*130*2);

var nextX:Number = B.x+L*Math.cos(angle);

var nextY:Number = B.y+L*Math.sin(angle);

this.addEventListener(Event.ENTER_FRAME,f);

function f(e:Event):void {

angle+=Math.PI/180;

nextX = B.x+L*Math.cos(angle);

nextY = B.y+L*Math.sin(angle);

}

kglad · Answer

what is your vector? is it a movieclip? is it a line drawn dynamically (using the graphics class)? something else?

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