Creating an Optimized Post-Retro Game - The Essential Guide to Flash Games - page 529

import flash.display.Shape;
import flash.geom.Point;
import flash.filters.GlowFilter;

public class BlitArrayPlayerFollowMouse extends BasicBlitArrayObject{

public var xMove:int;
public var yMove:int;
private var xChange:int;
private var yChange:int;
private var radians:Number;
private var degrees:int;

private var drawingCanvas:Shape = new Shape();

public var shipBitmapData:BitmapData = new BitmapData(32, 32, true, 0x00000000);

public var shieldBitmapData:BitmapData = new BitmapData(32, 32, true, 0x00000000);
public var shieldRender:Boolean = false;
public var shieldCount:int = 0;
public var shieldLife:int = 5;

public function BlitArrayPlayerFollowMouse(xMin:int,xMax:int, yMin:int, yMax:int ) {
super(xMin, xMax, yMin, yMax);
}

public function update(mousePositionX:Number, mousePositionY:Number,

delay:int,step:Number=1):void {

radians = Math.atan2((mousePositionY)-y,(mousePositionX)-x);
degrees= (radians * (180 / Math.PI));

yChange= (mousePositionY-y);
xChange= (mousePositionX-x);

yMove=(yChange/delay)*step;
xMove=(xChange/delay)*step;

nextY+=yMove;
nextX+=xMove;

if (nextX > xMax) {
nextX = xMax;
}else if (nextX < +xMin) {
nextX = xMin;
}

if (nextY > yMax) {
nextY = yMax;
}else if (nextY < yMin) {
nextY = yMin;
}

frame = degrees;