Arcs are an unusual implementation of splines due to Ted Kaehler. Imagine two lines that meet at a corner. Now imagine two moving points; one moves from the corner to the end on one line, the other moves from the end of the other line in to the corner. Now imagine a series of lines drawn between those moving points at each step along the way (they form a sort of spider web pattern). By connecting segments of the intersecting lines, a smooth curve is achieved that is tangent to both of the original lines. Voila.

	display box access
	computeBoundingBox

	displaying
	displayOn:at:clippingBox:rule:fillColor: displayOn:transformation:clippingBox:rule:fillColor:

	accessing	top
	center Answer the point at the center of the receiver.
	center: Set aPoint to be the receiver's center.
	center:radius: The receiver is defined by a point at the center and a radius. The quadrant is not reset.
	center:radius:quadrant: Set the receiver's quadrant to be the argument, section. The size of the receiver is defined by the center and its radius.
	quadrant Answer the part of the circle represented by the receiver.
	quadrant: Set the part of the circle represented by the receiver to be the argument, section.
	radius Answer the receiver's radius.
	radius: Set the receiver's radius to be the argument, anInteger.

	display box access	top
	computeBoundingBox Refer to the comment in DisplayObject|computeBoundingBox.

	displaying	top
	displayOn:at:clippingBox:rule:fillColor: Display this Path--offset by aPoint, clipped by clipRect and the form associated with this Path will be displayedr according to one of the sixteen functions of two logical variables (rule). Also the source form will be first anded with aForm as a mask. Does not effect the state of the Path
	displayOn:transformation:clippingBox:rule:fillColor: Displays this path, translated and scaled by aTransformation. Get the scaled and translated Path.

	examples	top
	example Click the button somewhere on the screen. The designated point will be the center of an Arc with radius 50 in the 4th quadrant.