In RR the start arrow and the end arrow point away from each other.
I needed a line with the more traditional arrows, both pointing in the same
direction along the line.
The following handler will reverse the direction of the start arrow.
It does so by introducing a third point ON THE LINE between the two original
point. It is locate just a SHORT distance (ds) up from the original start
point.
The end arrow will now point from this new intermediate point, to the original
start point, thus, effectively, revering the direction.
on mouseUp
put "myLine" into tName --Name of the line
set the endArrow of grc tName to true
set the startArrow of grc tName to True
set the arrowsize of grc tName to 6
put the points of grc tName into tPoints
put line 1 of tPoints into tStart
put line 2 of tPoints into tEnd
put item 1 of tEnd - item 1 of tStart into dx
put item 2 of tEnd - item 2 of tStart into dy
--Now create a new end point.
--It will be just a short distance (ds) up from the original end point.
put 2 into ds
put atan2(dy,dx) into tAngle
put ds * cos(tAngle) into dx
put ds * sin(tAngle) into dy
add round(dx) to item 1 of tStart
add Round(dy) to item 2 of tStart
--Insert this new end point into the line's points
put tStart & cr & tPoints into tNewPoints
set the points of grc tName to tNewPoints
end mouseUp
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