Function to drawing Arc in Java

Question

Hello Everybody!!
I have already posted this on the "Jave Programming" forum but this place might be more helpful. I am working on a diagram editor and what I want to do is to allow the user to connect pairs of objects using arcs. ( see this picture http://www.csee.umbc.edu/~squire/images/451-f2.jpg ).
The default drawArc method in the Graphic class basically requires six parameters: x, y, width, height, startAngle, arcAngle. (EXPLANATION: x - the x coordinate of the upper-left corner of the arc to be drawn, y - the y coordinate of the upper-left corner of the arc to be drawn, width - the width of the arc to be drawn , height - the height of the arc to be drawn , startAngle - the beginning angle, arcAngle - the angular extent of the arc, relative to the start angle ).
Say I want to draw an arc from one point (x1 ,y1) to another point (x2,y2) , how would I determine width, height, startAngle, arcAngle ????
Any help would be greatly appreciated.

Answer 1

Say I want to draw an arc from one point (x1 ,y1) to another point
(x2,y2) , how would I determine width, height, startAngle,
arcAngle ????It takes 3 non-collinear points to explicitly define a circle. However,
since you only have 2 points then we can assume the circle's diameter
is the distance between the points.
Let's assume the two points have the same y-value. Then, the width
and height are:
x = x1
y = y1
width = Math.abs(x2 - x1)
height = width / 2
beginning angle = 0
arcAngle = Math.PI // this might be -Math.PI ... not sure
Something like that, it shouldn't take too much effort to get it working.