class TLine {
	var a, b, c, abroot, k:Number;
	function TLine(mya:Number, myb:Number, myc:Number) {
		a = mya;
		b = myb;
		c = myc;
		abroot = Math.sqrt(Math.pow(a, 2)+Math.pow(b, 2));
		if (b != 0) {
			k = -(a/b);
		} else {
			k = Infinity;
		}
	}
	public function reset(mya:Number, myb:Number, myc:Number) {
		a = mya;
		b = myb;
		c = myc;
		abroot = Math.sqrt(Math.pow(a, 2)+Math.pow(b, 2));
		if (b != 0) {
			k = -(a/b);
		} else {
			k = Infinity;
		}
	}
	public function paraTo(other:TLine) {
		if ((other.a*b-other.b*a == 0) && ((other.a*this.c-other.c*this.a != 0) || (other.b*this.c-other.c*this.b != 0))) {
			return true;
		} else {
			return (false);
		}
	}
	public function vertTo(other:TLine) {
		trace(other.a*a+other.b*b);
		if (other.a*a+other.b*b == 0) {
			return true;
		} else {
			return false;
		}
	}
	public function distTo(other:TLine) {
		var lemt:Number;
		if (paraTo(other)) {
			if (other.a != 0) {
				lemt = a/other.a;
			} else {
				lemt = b/other.b;
			}
			return ((other.c*lemt-c)/abroot);
		} else {
			return (false);
		}
	}
	public function insectPoint(other:TLine) {
		var lemt:Number;
		if (!paraTo(other)) {
			if (other.a != 0) {
				lemt = -a/other.a;
				var y1:Number = (-c-other.c*lemt)/(b+other.b*lemt);
				var x1:Number = (-other.c-other.b*y1)/other.a;
			} else {
				lemt = -b/other.b;
				var x1:Number = (-c-other.c*lemt)/(a+other.a*lemt);
				var y1:Number = (-other.c-other.a*x1)/other.b;
			}
			var p1:TPoint = new TPoint(x1, y1);
			return p1;
		}
	}
	public function calcX(y1:Number) {
		if (a != 0) {
			return ((-c-b*y1)/a);
		} else {
			return false;
		}
	}
	public function calcY(x1:Number) {
		if (b != 0) {
			return ((-c-a*x1)/b);
		} else {
			return false;
		}
	}
	public function outform() {
		var a1:String = String(a);
		var b1:String = String(b);
		var c1:String = String(c);
		if (a == 0) {
			a1 = "";
		} else {
			if (a == 1) {
				a1 = "x";
			} else if (a == -1) {
				a1 = "-x";
			} else {
				a1 += "x";
			}
		}
		if (b == 0) {
			b1 = "";
		} else if (b>0) {
			if (b == 1) {
				b1 = "+y";
			} else {
				b1 = "+"+b1+"y";
			}
		} else {
			if (b == -1) {
				b1 = "-y";
			} else {
				b1 += "y";
			}
		}
		if (c == 0) {
			c1 = "";
		} else if (c>0) {
			c1 = "+"+c1;
		}
		return (a1+b1+c1+"=0");
	}
	public function posiFini() {
		if (b != 0) {
			var p1:TPoint = new TPoint(100, calcY(100));
			return p1;
		}
		var p1:TPoint = new TPoint(calcX(100), 100);
		return p1;
	}
	public function negaFini() {
		if (b != 0) {
			var p1:TPoint = new TPoint(-100, calcY(-100));
			return p1;
		}
		var p1:TPoint = new TPoint(calcX(-100), -100);
		return p1;
	}
	public function getValue(x:Number,y:Number){
		return(a*x+b*y+c);
	}
}