// game_rocket_functions.php
<script>
function rocket(type,w,h,x,y,speed,acceleration,orient,bodyColor,outlineColor,index){	
	this.type=type;
	this.w=w; //base dimension for the rocket
	this.h=h; // height of rocket
	this.x=x; // initial position x - front tip of rocket
	this.y=y;  // initial position y - front tip of rocket
	this.tics=0
	this.bodyColor=bodyColor;
	this.outlineColor=outlineColor;
	this.p1={x:0,y:0}; this.p2={x:0,y:0}; this.p3={x:0,y:0};
	this.speed=speed;
	this.acceleration=acceleration;
	this.fired=false;
	this.orient;
	this.drawRocket=drawRocket;
	this.findTarget=findTarget;
	this.inc ={x:x,y:y};
	this.angle_inc=0;
	this.targetPoint ={x:1,y:1};
	this.index=index;
	this.geom="triangle";
	function drawRocket(){
		angle=totalAngle;
		radians=angle*3.14159/180.;
		ninetydeg=3.14159/2.0;
		theta=ninetydeg-radians;
		if (countLockedTargets()>0){
			V0={x:this.h * Math.cos(theta),y:- this.h * Math.sin(theta)};
			V1={x:this.targetPoint.x-this.x,y:this.targetPoint.y-this.y};		
			AA=angleBetween(V0,V1);
			//drawTextA('AA='+AA.toFixed(0),'28px arial',"#f50",200,250);
		}	
		if(this.fired==true) {
			this.tics=this.tics+1;
			radians=this.orient*3.14159/180.;
			ninetydeg=3.14159/2.0;
			theta=ninetydeg-radians;
			V0={x:this.h * Math.cos(theta), y:-this.h * Math.sin(theta)}; //vector running length of rocket
			V1={x:this.targetPoint.x-this.x,y:this.targetPoint.y-this.y};
			AA=angleBetween(V0,V1);
			//drawTextA('AA='+AA.toFixed(1),'28px arial',"#ff0",200,200);
			
			if (AA>.0000 && AA < 180 ) this.orient=this.orient-rocket_adjustment_angle;
		    if (AA >=180 && AA < 360) this.orient=this.orient+rocket_adjustment_angle;
			
			var delta1=AA; if(delta1>15) delta1=15;
			if (AA>.0000 && AA < 180&& this.tics>25) this.orient=this.orient-.25*delta1; 
			var delta2=360-AA; if(delta2>15) delta2=15;
			if (AA >=180 && AA < 360&& this.tics>25) this.orient=this.orient+.25*delta2;
			acc=0.5;spd=this.speed+acc*this.tics;
			if (spd>30) spd=30;
			xx=spd*Math.cos(theta);
			yy=spd*Math.sin(theta);
			this.x=this.x+xx;
			this.y=this.y-yy;
		}
		var RI=this.index;
		points=new Array();	
		x=this.x + this.h * Math.cos(theta);  //point at tip of rocket.
		y=this.y - this.h * Math.sin(theta);
		point={x:x,y:y};
		points.push(point);
		x1=this.x+this.w/2 * Math.cos(radians);
		y1=this.y+this.w/2 * Math.sin(radians);
		point={x:x1,y:y1};
		points.push(point);	
		x2=this.x-this.w/2 * Math.cos(radians);
		y2=this.y-this.w/2 * Math.sin(radians);
		point={x:x2,y:y2};
		points.push(point);
		this.p1.x=x; this.p1.y=y; this.p2.x=x1; this.p2.y=y1; this.p3.x=x2; this.p3.y=y2; //to be used for collision and homing
		drawTriangle(points,this.bodyColor,this.outlineColor,0);		
	}
	function findTarget(){
		keyCodeList[65]=false;
		Lmax=0;max_i=-1;
		for (i=0;i<targets.length;i++) {
			if (targets[i].living==false) continue;
			if(targets[i].type=="box" || targets[i].type=="monster"){			
				L=Math.pow( Math.pow(this.p1.x-targets[i].x,2) +  Math.pow(this.p1.y-targets[i].y,2),0.5 );
				if (L>Lmax) {Lmax=L;max_i=i;}
			}
		}
		if (max_i>=0) {targets[max_i].locked_on = true;rocketTargetIndex=max_i;}
	}   
} // end rocket object
function createRocket(){
	if (rockets.length<3) {
		var rock=new rocket("homing",rocket_width,rocket_height,shooter1.x,shooter1.y,rocket_speed,rocket_acceleration,totalAngle,rocket_bodyColor,rocket_outlineColor,rockets.length);
		rockets.push(rock);
	}
}
function countLockedTargets(){
	if (activeRocketIndex<0) return 0;
	var num=0;
	for (i=0;i<targets.length;i++) {
		if (targets[i].living==false) continue;
		if (targets[i].locked_on==true) {
			num=num+1
			rockets[activeRocketIndex].targetPoint.x=targets[i].x;
			rockets[activeRocketIndex].targetPoint.y=targets[i].y;
		}
	}
	return num;
}
function fireRocket(){
	rockets[rockets.length-1].orient=totalAngle;	
	rockets[rockets.length-1].fired=true;
	activeRocketIndex=rockets.length-1;
}
function checkRocketOverlap(a,b) {
	if (activeRocketIndex==-1) return; 
	var zero=0;
	var one=1;
	A={x:rockets[activeRocketIndex].p1.x,y:rockets[activeRocketIndex].p1.y};
	P=new Array();
	x1p=b.x-b.w/2;
	y1p=b.y-b.h/2;
	P[0] ={x:x1p,y:y1p};
	x2p=b.x+b.w/2;
	y2p=b.y-b.h/2;
	P[1] ={x:x2p,y:y2p};	
	x3p=b.x+b.w/2;
	y3p=b.y+b.h/2;
	P[2] ={x:x3p,y:y3p};
	x4p=b.x-b.w/2;
	y4p=b.y+b.h/2;
	P[3] ={x:x4p,y:y4p};
	if (isPointInTriangle(A,P[0],P[1],P[2]) ){return one;}
	if (isPointInTriangle(A,P[0],P[2],P[3]) ){return one;}
	return zero;
}
function killRocket(object){
	var ipos=rockets.indexOf(object);
	rockets.splice(ipos,1);
	activeRocketIndex=-1;
	if (rockets.length==0 && shooter1.status!="spreadshot") shooter1.status="normal";
} // function
function getRocketTargetIndex(){
	var rti=-1;
		for (var i=0;i<targets.length-1;i++){
			if (targets[i].living==false) continue;
			if ( (targets[i].type=="box" || targets[i].type=="monster") && targets[i].locked_on==true) {rti=i;return rti;}
		}
		return rti;   // no active rocket
}
</script>