Halo all,

I am trying to develop a program with the following aim.

** A partial section** of a circle which rotates around its center with constant angular velocity.

Description:

A circle with radius 150 mm (center located at 0,0) is equipped with known points along its circumference as shown in Figure below. A partial section (with constant length) should be identified and observed as it moves around the circle. With the below mentioned code (written in FORTRAN) i am able to locate two points (point A and B) as they move with time but **not able to capture points lying between these two points (A and B). ** Please check the code below. Thank you in advance.

c calculate the new position

c measure the Difference to the Center

difx1 = PointAx - originx

dify1 = PointAy - originy

```
difx2 = PointBx - originx
dify2 = PointBy - originy
```

c calculate the angle in RADIANs

c Theta = w * time w is angular velocity in rad/sec

radns = angvel * time

```
newx = cos(radns)
newy = sin(radns)
dx1 = (difx1 * newx) - (dify1 * newy)
dx2 = (difx2 * newx) - (dify2 * newy)
dy1 = (difx1 * newy) + (dify1 * newx)
dy2 = (difx2 * newy) + (dify2 * newx)
PointAx = originx + dx1
PointAy = originy + dy1
PointBx = originx + dx2
PointBy = originy + dy2
```

c check weather this node LIES in the heating Zone ** [COLOR=Red]/ HERE IS PROBLEM, How to locate region between two points A and B[/COLOR]**

if((points(1) .lt. PointBx) .or. (points(1) .gt. PointAx)) then

c NOT in the region

c DO Not apply anything

```
else
xin = .true.
end if
```

c **[COLOR=Red]/ HERE IS PROBLEM, How to locate region between two points A and B[/COLOR]**

if((points(2) .lt. PointAy) .or. (points(2) .gt. PointB)) then

C Not in the region

C DO Not apply anything

```
else
yin = .true.
end if
IF (xin .and. yin) then
```

c WE are in the Region

```
end if
```

I just wanted to get the region between the two nodes. Thank you.

Regards,

PSR