#include plot.iss

function plotCircle()
{
	;== WoW doesn't use a standard X Y axis, it is flipped 90degrees.
	;== Heading due west (270deg.) Y will increase
	;== Heading due north (0deg.) X will increase
	;==            X+
	;== 	        |
	;== 	        |
	;== 	        |
	;== 	        |
	;== 	        |
	;== Y+----------|----------
	;==	        |
	;== 	        |
	;== 	        |
	;== 	        |
	;== 	        |

	declare debug int local 0
	;== right triangle.  a=adjacent, b=opposite, c=hypotenuse
	if (!${Variable[a](exists)})
		declare a float script 0
	;== this is the radius of the circle
	declare c int local 40
	;== center of a circle. h is x axis, k is y axis
	if (!${Variable[h](exists)})
		declare h float script
	if (!${Variable[k](exists)})
		declare k float script
	;== Which part of the graph we are in.  Circle starts at 0, or Y
	;== 0=between 270 and 0 deg., 1=0-90, 2=90-180, 3=180-270
	if (!${Variable[NESW](exists)})
		declare NESW int script 0
	;== Where we are facing
	if (!${Variable[toX](exists)})
		declare toX float script
	if (!${Variable[toY](exists)})
		declare toY float script
	;== Distance to check ahead for obstacles
	if (!${Variable[obsDis](exists)})
		declare obsDis int script 30
	
	;== The circle will always begin at 270degrees because it is our Y axis.
	;== Get the center of the circle. h = my X, k = my Y minus hypotenuse c
	if (!${h})
		h:Set[${Me.X}]
	if (!${k})	
		k:Set[${Math.Calc[${Me.Y}-${c}]}]
	if (${debug}==1)
		echo Center (h,k): ${h},${k}
		
	;== Add to side b and calc the new adj. side a.
	;== First round a is X axis, b is Y axis. Solve for Y
	;== Second round a is Y axis, b is X axis. Solve for X
	;== Third round a is X. Solve Y
	;== Fourth a is a is Y. Solve X
	;== r^2 = (x - h)^2 + (y - k)^2
	;== y = k +/- Sqrt( r^2 - (x - h)^2 )
	;== x = h +/- Sqrt( r^2 - (y - k)^2 )
	if (${NESW}==0)
	{
		call incAdj ${a} ${c}
		a:Set[${Return}]
		toX:Set[${Math.Calc[${a}+${h}]}]
		toY:Set[${Math.Calc[${c}^^2 - (${toX} - ${h})^^2]}]
		toY:Set[${Math.Abs[${toY}]}]
		toY:Set[${Math.Sqrt[${toY}]}]
		toY:Set[${Math.Calc[${k} + ${toY}]}]
		if (${debug}==1)
		{
			echo After Inc and calc. (a) (NESW): ${a} ${NESW}
			echo toX,toY: ${toX},${toY}
		}
	}
	elseif (${NESW}==1)
	{
		call incAdj ${a} ${c}
		a:Set[${Return}]
		toY:Set[${Math.Calc[${k}-${a}]}]
		toX:Set[${Math.Calc[${c}^^2 - (${toY} - ${k})^^2]}]
		toX:Set[${Math.Abs[${toY}]}]
		toX:Set[${Math.Sqrt[${toX}]}]
		toX:Set[${Math.Calc[${h} + ${toX}]}]
		if (${debug}==1)
		{
			echo After Inc and calc. (a) (NESW): ${a} ${NESW}
			echo toX,toY: ${toX},${toY}
		}
	}
	elseif (${NESW}==2)
	{
		call incAdj ${a} ${c}
		a:Set[${Return}]
		toX:Set[${Math.Calc[${h}-${a}]}]
		toY:Set[${Math.Calc[${c}^^2 - (${toX} - ${h})^^2]}]
		toY:Set[${Math.Abs[${toY}]}]
		toY:Set[${Math.Sqrt[${toY}]}]
		toY:Set[${Math.Calc[${k} - ${toY}]}]
		if (${debug}==1)
		{
			echo After Inc and calc. (a) (NESW): ${a} ${NESW}
			echo toX,toY: ${toX},${toY}
		}
	}
	elseif (${NESW}==3)
	{
		call incAdj ${a} ${c}
		a:Set[${Return}]
		toY:Set[${Math.Calc[${a}+${k}]}]
		toX:Set[${Math.Calc[${c}^^2 - (${toY} - ${k})^^2]}]
		toY:Set[${Math.Abs[${toY}]}]
		toX:Set[${Math.Sqrt[${toX}]}]
		toX:Set[${Math.Calc[${h} - ${toX}]}]
		if (${debug}==1)
		{
			echo After Inc and calc. (a) (NESW): ${a} ${NESW}
			echo toX,toY: ${toX},${toY}
		}
	}
	
	;if adj. side = hypot. then we need to increment NESW
	if (${a}==${c})
	{
		if (${debug}==2)
		{
			echo Made it to an axis. (NESW): ${NESW}
			;wait 20
		}
		if (${NESW}==3)
			NESW:Set[0]
		else
			NESW:Inc
		;== b=c and a=0
		a:Set[0]
	}
}

function:float incAdj(float a, float c)
{
	;== how much the opposite side of the triangle is increased
	declare abInc int local 7

	;== increment a.  If a+abInc < c add abInc, else a=c
	if (${Math.Calc[${a}+${abInc}]} < ${c})
		a:Set[${Math.Calc[${a}+${abInc}]}]
	else
		a:Set[${c}]
	return ${a}
}

;== Get's the next point in the circle and moves me to it.
function moveInACircle()
{
	declare debug int local 0
	if (!${Variable[madeIt](exists)})
		declare madeIt bool script TRUE
	
	;get the new coords and face them
	if (${madeIt})
	{
		if (${debug}==1)
			echo getting new coords
		call plotCircle
		if (${debug}==1)
			echo new coords ${toX} ${toY}
		face ${toX} ${toY}
		call plotXY ${obsDis}
		madeIt:Set[FALSE]
	}
	;check for obstacles
	if (${debug}==2)
		echo Obstructed: ${Me.IsPathObstructed[${plotX},${plotY},${Math.Calc[${Me.Z}+5]},${obsDis},${Me.X},${Me.Y},${Me.Z}]}
	;if I haven't made it to the plotted points and my path isn't obstructed.
	if (${Math.Distance[${Me.X},${Me.Y},${toX},${toY}]} > 3 && !${Me.IsPathObstructed[${plotX},${plotY},${Math.Calc[${Me.Z}+5]},${obsDis},${Me.X},${Me.Y},${Me.Z}]})
	{		
		face ${toX} ${toY}
		wowpress -hold moveforward
		call plotXY ${obsDis}
		if (${debug}==2)
			echo Obstructed: ${Me.IsPathObstructed[${plotX},${plotY},${Math.Calc[${Me.Z}+5]},${obsDis},${Me.X},${Me.Y},${Me.Z}]}
		wait 1
	}
	else
	{
		if (${debug}==1)
		{
			echo Made it to ${toX} ${toY} or obstructed
			echo Distance: ${Math.Distance[${Me.X},${Me.Y},${toX},${toY}]} Obstructed: ${Me.IsPathObstructed[${plotX},${plotY},${Math.Calc[${Me.Z}+5]},${obsDis},${Me.X},${Me.Y},${Me.Z}]}
		}
		madeIt:Set[TRUE]
		if (${Me.IsPathObstructed[${plotX},${plotY},${Math.Calc[${Me.Z}+5]},${obsDis},${Me.X},${Me.Y},${Me.Z}]})
			wowpress -release moveforward
	}
}