![]() Since B = TAN(PI/8) this can be entered directly in code What Bulge factor would give an included angle of 90 deg? What does an even number 0.5 Bulge factor give? If the center moves far away the included angle gets small, the tangent of that angle is small, the arc is nearly a straight line, and the Bulge factor is small. As the center gets closer to the arc, the angle gets larger. This center moves along a line as the bulge factor changes. Two lines drawn from the center to the vertexes define the included angle. The arc no matter what curvature it takes is always a part of a circle. A bulge of 0 indicates a straight segment, and a bulge of 1 is a semicircle.” A negative bulge value indicates that the arc goes clockwise from the selected vertex to the next vertex. ![]() “The bulge is the tangent of 1/4 of the included angle for the arc between the selected vertex and the next vertex in the polyline’s vertex list. Setbulge takes two parameters, the lower numbered index of the vertex that begins the segment, and a Bulge value. The LWPolyline object returned has a SetBulge method to change a straight line segment to an arc. The Autocad VBA object AcadLWPolyline is made in straight line segments with AddLightWeightPolyline method using an array of coordinates. ![]()
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