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Home » Eclipse Projects » GEF » [GEF4] geometry intersection computation duration
[GEF4] geometry intersection computation duration [message #1719814] Tue, 12 January 2016 09:41 Go to next message
Sylvain Bi is currently offline Sylvain BiFriend
Messages: 10
Registered: May 2015
Junior Member
Hello, I have a method that's find intersections between a BezierCurve and a Line, but some time the getNearestIntersection method takes more time than usual...

10 occurrences that take less than 1ms :

Point referencePoint = new Point(15.0, 10000.0);
Line line = new Line(new Point(15.084666766666667, -10000.0) , new Point (15.084666766666667, 10000.0));
BezierCurve curve = new BezierCurve(new Point(6.599999999999993, 2.3727936609778726), new Point(13.237499975331303, 2.37263938999188), new Point(17.662536995636934, 2.374123516379587), new Point(24.30000000000008, 2.37226488262784));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 0ms 


Point referencePoint = new Point(15.0, 10000.0);
Line line = new Line(new Point(15.254000199999998, -10000.0) , new Point (15.254000199999998, 10000.0));
BezierCurve curve = new BezierCurve(new Point(6.599999999999993, 2.3727936609778726), new Point(13.237499975331303, 2.37263938999188), new Point(17.662536995636934, 2.374123516379587), new Point(24.30000000000008, 2.37226488262784));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 0ms 


Point referencePoint = new Point(26.5, -10000.0);
Line line = new Line(new Point(26.0428, -10000.0) , new Point (26.0428, 10000.0));
BezierCurve curve = new BezierCurve(new Point(26.100000000000104, -2.2746851555884886), new Point(26.062501730606815, -2.277152214709952), new Point(26.0375016726132, -2.2787790557391063), new Point(26.000000000000103, -2.2811938345444247));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 0ms 


Point referencePoint = new Point(26.5, -10000.0);
Line line = new Line(new Point(26.3476, -10000.0) , new Point (26.3476, 10000.0));
BezierCurve curve = new BezierCurve(new Point(26.40000000000011, -2.2543064982196563), new Point(26.362501913756493, -2.256935096991749), new Point(26.337501851265586, -2.258668963768477), new Point(26.300000000000107, -2.2612432934299416));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 0ms 


Point referencePoint = new Point(26.5, -10000.0);
Line line = new Line(new Point(26.6524, -10000.0) , new Point (26.6524, 10000.0));
BezierCurve curve = new BezierCurve(new Point(26.700000000000113, -2.2326108778904623), new Point(26.66250211105171, -2.235407157058545), new Point(26.63750204398072, -2.2372521371959477), new Point(26.60000000000011, -2.2399921315224565));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 0ms 


Point referencePoint = new Point(26.5, -10000.0);
Line line = new Line(new Point(26.9572, -10000.0) , new Point (26.9572, 10000.0));
BezierCurve curve = new BezierCurve(new Point(27.000000000000117, -2.2095485650966684), new Point(26.96250232596202, -2.212518843259614), new Point(26.937502252321718, -2.214479096795463), new Point(26.900000000000116, -2.217391003791821));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 0ms 


Point referencePoint = new Point(26.5, 10000.0);
Line line = new Line(new Point(26.0428, -10000.0) , new Point (26.0428, 10000.0));
BezierCurve curve = new BezierCurve(new Point(26.000000000000103, 2.2811938345444247), new Point(26.037501672613196, 2.2787790557391063), new Point(26.062501730606815, 2.2771522147099525), new Point(26.100000000000104, 2.2746851555884886));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 0ms 


Point referencePoint = new Point(26.5, 10000.0);
Line line = new Line(new Point(26.3476, -10000.0) , new Point (26.3476, 10000.0));
BezierCurve curve = new BezierCurve(new Point(26.300000000000107, 2.2612432934299416), new Point(26.337501851265582, 2.258668963768477), new Point(26.362501913756493, 2.256935096991749), new Point(26.40000000000011, 2.2543064982196563));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 0ms 


Point referencePoint = new Point(26.5, 10000.0);
Line line = new Line(new Point(26.6524, -10000.0) , new Point (26.6524, 10000.0));
BezierCurve curve = new BezierCurve(new Point(26.60000000000011, 2.2399921315224565), new Point(26.63750204398072, 2.2372521371959477), new Point(26.66250211105171, 2.235407157058545), new Point(26.700000000000113, 2.2326108778904623));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 0ms 


Point referencePoint = new Point(26.5, 10000.0);
Line line = new Line(new Point(26.9572, -10000.0) , new Point (26.9572, 10000.0));
BezierCurve curve = new BezierCurve(new Point(26.900000000000116, 2.217391003791821), new Point(26.93750225232172, 2.214479096795463), new Point(26.96250232596202, 2.212518843259614), new Point(27.000000000000117, 2.2095485650966684));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 0ms 



10 occurrences that take more or less 500ms :

Point referencePoint = new Point(15.0, -10000.0);
Line line = new Line(new Point(15.152400199999999, -10000.0) , new Point (15.152400199999999, 10000.0));
BezierCurve curve = new BezierCurve(new Point(24.200000000000077, -2.3727936609778726), new Point(17.56250052131255, -2.372947931952322), new Point(13.137498435758783, -2.3730630604781013), new Point(6.499999999999994, -2.372678596158668));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 14ms 


Point referencePoint = new Point(12.999999999999984, 10000.0);
Line line = new Line(new Point(12.544999999999984, -10000.0) , new Point (12.544999999999984, 10000.0));
BezierCurve curve = new BezierCurve(new Point(6.599999999999993, 2.3727936609778726), new Point(13.237499975331303, 2.37263938999188), new Point(17.662536995636934, 2.374123516379587), new Point(24.30000000000008, 2.37226488262784));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 413ms 

Point referencePoint = new Point(15.0, 10000.0);
Line line = new Line(new Point(14.915333333333333, -10000.0) , new Point (14.915333333333333, 10000.0));
BezierCurve curve = new BezierCurve(new Point(6.599999999999993, 2.3727936609778726), new Point(13.237499975331303, 2.37263938999188), new Point(17.662536995636934, 2.374123516379587), new Point(24.30000000000008, 2.37226488262784));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 658ms 

Point referencePoint = new Point(15.0, 10000.0);
Line line = new Line(new Point(15.254000199999998, -10000.0) , new Point (15.254000199999998, 10000.0));
BezierCurve curve = new BezierCurve(new Point(6.599999999999993, 2.3727936609778726), new Point(13.237499975331303, 2.37263938999188), new Point(17.662536995636934, 2.374123516379587), new Point(24.30000000000008, 2.37226488262784));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 675ms 


Point referencePoint = new Point(9.2, -10000.0);
Line line = new Line(new Point(9.655000199999996, -10000.0) , new Point (9.655000199999996, 10000.0));
BezierCurve curve = new BezierCurve(new Point(24.200000000000077, -2.3727936609778726), new Point(17.56250052131255, -2.372947931952322), new Point(13.137498435758783, -2.3730630604781013), new Point(6.499999999999994, -2.372678596158668));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 701ms 


Point referencePoint = new Point(15.0, -10000.0);
Line line = new Line(new Point(14.542800199999999, -10000.0) , new Point (14.542800199999999, 10000.0));
BezierCurve curve = new BezierCurve(new Point(24.200000000000077, -2.3727936609778726), new Point(17.56250052131255, -2.372947931952322), new Point(13.137498435758783, -2.3730630604781013), new Point(6.499999999999994, -2.372678596158668));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 707ms 


Point referencePoint = new Point(9.2, 10000.0);
Line line = new Line(new Point(8.745, -10000.0) , new Point (8.745, 10000.0));
BezierCurve curve = new BezierCurve(new Point(6.599999999999993, 2.3727936609778726), new Point(13.237499975331303, 2.37263938999188), new Point(17.662536995636934, 2.374123516379587), new Point(24.30000000000008, 2.37226488262784));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 833ms 


Point referencePoint = new Point(15.0, 10000.0);
Line line = new Line(new Point(15.084666766666667, -10000.0) , new Point (15.084666766666667, 10000.0));
BezierCurve curve = new BezierCurve(new Point(6.599999999999993, 2.3727936609778726), new Point(13.237499975331303, 2.37263938999188), new Point(17.662536995636934, 2.374123516379587), new Point(24.30000000000008, 2.37226488262784));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 715ms 


Point referencePoint = new Point(26.5, 10000.0);
Line line = new Line(new Point(26.3476, -10000.0) , new Point (26.3476, 10000.0));
BezierCurve curve = new BezierCurve(new Point(26.300000000000107, 2.2612432934299416), new Point(26.337501851265582, 2.258668963768477), new Point(26.362501913756493, 2.256935096991749), new Point(26.40000000000011, 2.2543064982196563));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 710ms 


Point referencePoint = new Point(15.0, 10000.0);
Line line = new Line(new Point(14.915333333333333, -10000.0) , new Point (14.915333333333333, 10000.0));
BezierCurve curve = new BezierCurve(new Point(6.599999999999993, 2.3727936609778726), new Point(13.237499975331303, 2.37263938999188), new Point(17.662536995636934, 2.374123516379587), new Point(24.30000000000008, 2.37226488262784));
Point intersectionPoint = line.getNearestIntersection(curve, referencePoint);

// getNearestIntersection(curve, referencePoint) calculation duration : 721ms 


This method is not called from a thread, it is triggered from an user UI input.
As you can see it's always an intersection between bezier curve of 4 points, and a vertical line.
This latency happens also on 2 other laptop (Win7, intel i5, 8Go RAM)

[Updated on: Tue, 12 January 2016 09:41]

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Re: [GEF4] geometry intersection computation duration [message #1719877 is a reply to message #1719814] Tue, 12 January 2016 20:00 Go to previous messageGo to next message
Alexander Nyssen is currently offline Alexander NyssenFriend
Messages: 235
Registered: July 2009
Location: Lünen
Senior Member
Please open a bugzilla. Matthias (who has done most of the Geometry calculation can then take a look.
Re: [GEF4] geometry intersection computation duration [message #1720582 is a reply to message #1719877] Tue, 19 January 2016 13:43 Go to previous message
Alexander Nyssen is currently offline Alexander NyssenFriend
Messages: 235
Registered: July 2009
Location: Lünen
Senior Member
Sylvain, Matthias has left a comment within https://bugs.eclipse.org/bugs/show_bug.cgi?id=485776. Could you please take a look?
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