// dipende da gngraph.txt che deve essere aperta
// qui faro' un check che gngraph sia aperta
function dist(A,B){
	return Math.sqrt(Math.pow(A.x-B.x,2)+Math.pow(A.y-B.y,2))
}

function Angle(B,A,C,nome){
	this.A=A;
	this.B=B;
	this.C=C;
	this.nome=nome;
	// definisco angoli rispetto all'asse x dei due lati dell'angolo
	var dy=-(B.y-A.y);	var dx=B.x-A.x;var alpha1= Math.atan2(dy,dx);
	var dy=A.y-C.y;	var dx=C.x-A.x;var alpha2= Math.atan2(dy,dx);
	if(Math.max(alpha1,alpha2)-Math.min(alpha1,alpha2)>Math.PI){
		if(alpha1<0){alpha1+=2*Math.PI};
		if(alpha2<0){alpha2+=2*Math.PI};
	}
	this.alpha1=alpha1;
	this.alpha2=alpha2;
	this.mediana=(alpha1+alpha2)/2;
	//raggio a 1/4 della distanza minima
	this.r=Math.min(dist(A,B),dist(A,C))/2;
	this.draw=function(){
		drawArc(this.A.x-this.r/2,this.A.y-this.r/2,this.r,this.r,Math.min(this.alpha1,this.alpha2),Math.max(this.alpha1,this.alpha2));
		drawString(this.nome,A.x+Math.cos(this.mediana)*this.r/1.8,A.y-Math.sin(this.mediana)*this.r/1.8);
	}
	

}
function PointRelative(x,y,r){ // r is a rectangle left-bottom is the origin
	this.x=r.x+x;
	this.y=(r.y+r.h)-y;
	this.r=r;
	this.draw=function(){setPoint(this.x,this.y)}
	this.name=function(nn){drawString(nn,this.x,this.y-10)}
}

function Rectangle(x0,y0,w,h){
	this.x=x0;
	this.y=x0;
	this.w=w;
	this.h=h;
	this.draw= function(){
		drawRect(this.x,this.y,this.w,this.h);
	}

}

function Triangle(A,B,C,aa,bb,cc){
	this.A=A;
	this.B=B;
	this.C=C;
	this.draw= function(){
		drawLine(this.A.x,this.A.y,this.B.x,this.B.y);
		drawLine(this.B.x,this.B.y,this.C.x,this.C.y);
		drawLine(this.C.x,this.C.y,this.A.x,this.A.y);
		drawString(aa,this.A.x,this.A.y);
		drawString(bb,this.B.x,this.B.y);
		drawString(cc,this.C.x,this.C.y);

	}
	

}

function Retta(A,B){
	this.m=-(B.y-A.y)/(B.x-A.x);
	this.n=(A.y);
	this.A=A;	this.B=B;

	this.draw=function(){
		drawLine(this.A.x,this.A.y,this.B.x,this.B.y);
		setColor(red);
	}
	this.y=function(x){return this.n-this.m*(this.A.x+x)}
}