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EllipseEllipseIntersect.md

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EllipseEllipseIntersect

Description

Calculates the intersections between the two specified ellipses.

FUNCTION EllipseEllipseIntersect(
				upperLeft1  : POINT;
				lowerRight1 : POINT;
				upperLeft2  : POINT;
				lowerRight2 : POINT;
				VAR int1    : POINT;
				VAR int2    : POINT;
				VAR int3    : POINT;
				VAR int4    : POINT): INTEGER;
def vs.EllipseEllipseIntersect(upperLeft1, lowerRight1, upperLeft2, lowerRight2):
    return (INTEGER, int1, int2, int3, int4)

Parameters

Name Type Description
upperLeft1 POINT Upper-left point of the first ellipse
lowerRight1 POINT Lower-right point of the first ellipse
upperLeft2 POINT Upper-left point of the second ellipse
lowerRight2 POINT Lower-right point of the second ellipse
int1 POINT On return, first point of intersection, if found
int2 POINT On return, second point of intersection, if found
int3 POINT On return, third point of intersection, if found
int4 POINT On return, fourth point of intersection, if found

Remarks

On return, int1, int2, int3, and int4 contain the points of intersection. Return value indicates which intersections are legal.

Examples

VectorScript

PROCEDURE Example;
VAR
h1, h2 :HANDLE;
upperLeft1, lowerRight1 :POINT;
upperLeft2, lowerRight2 :POINT;
int1, int2, int3, int4 :POINT;
num :INTEGER;
BEGIN
CallTool(-205); h1 := FSActLayer;
CallTool(-205); h2 := FSActLayer;
GetBBox(h1, upperLeft1.x, upperLeft1.y, lowerRight1.x, lowerRight1.y);
GetBBox(h2, upperLeft2.x, upperLeft2.y, lowerRight2.x, lowerRight2.y);
num := EllipseEllipseIntersect(upperLeft1, lowerRight1, upperLeft2, lowerRight2, int1, int2, int3, int4);
Message(num);
Locus(int1.x, int1.y);
Locus(int2.x, int2.y);
Locus(int3.x, int3.y);
Locus(int4.x, int4.y);
END;
RUN(Example);

Python

def Example():
	vs.OvalN(0, 0, 1, 0, 1, 1);
	h1 = vs.LActLayer()
	vs.OvalN(0, 0.5, 1, 0, 1, 1);
	h2 = vs.LActLayer()
	upperLeft1, lowerRight1 = vs.GetBBox(h1)
	upperLeft2, lowerRight2 = vs.GetBBox(h2)
	num,  int1, int2, int3, int4 = vs.EllipseEllipseIntersect(upperLeft1, lowerRight1, upperLeft2, lowerRight2)
	vs.Message(num)
	vs.Locus(int1[0], int1[1])
	vs.Locus(int2[0], int2[1])
	vs.Locus(int3[0], int3[1])
	vs.Locus(int4[0], int4[1])

Example()

Version

Availability: from VectorWorks10.0

Category