intersection

Ellipse and line intersection JAVA

由 主宰稳场 提交于 2019-12-09 01:38:45
问题 I have a ellipse with a mid-point 'mid' an a horizontal radius 'h' and a vertical radius 'v' and a Line2D. Now I need some code to calculate the two intersection points of the two. I already tried some code and tried it on my own but there always is a mistake. Does somebody have some working code? 回答1: You will need to use algebra to solve the two equations, and it will get a little bit messy. First you have to write out the ellipse (1) (x/h)^2 + (y/v)^2 = 1 and the line in the format (2) y =

Find intersection of two Locations

由 被刻印的时光 ゝ 提交于 2019-12-08 17:41:51
问题 I want to find the intersection points of two Locations in Android. I don't want to consider cases where the circles as shown in the Figure don't intersect or are included or are completely overlapping. My problem is that the Location is given in degree and the radius (accuracy) is given in meter. I do not know how to mix those Units. In my case the environment is Android, but the Problem is not Android specific. 回答1: You have to convert latitdue, longitude to a cartesian coordinate system,

LINQ Set Operations not working (Intersect, Except)

由 对着背影说爱祢 提交于 2019-12-08 13:43:28
I'd like to use the Uber-Coolness of LINQ set operations to express the following : foreach (Group group in groups) { if (user.Groups.Contains(group)) { assignedGroups.Add(group); } else { availableGroups.Add(group); } } I thought it should be a two-liner achieving this : var assigned = user.Groups.Intersect(groups); var available = groups.Except(user.Groups); Whenever I run this example the foreach approach fills my lists correctly, while the set operations result in an empty assigned list and a filled available list. I thought it must be a problem concerning the equality check, but the fact

Python calculate point of intersection of two great circles

由 筅森魡賤 提交于 2019-12-08 13:22:25
问题 I am trying to calculate the point of intersection (lat and lon in degrees) of two great circles that are each defined by two points on the circle. I have been trying to follow method outlined here. But the answer I get is incorrect, my code is below does anyone see where I went wrong? ################################################ #### Intersection of two great circles. # Points on great circle 1. glat1 = 54.8639587 glon1 = -8.177818 glat2 = 52.65297082 glon2 = -10.78064876 # Points on

Using Visitor Pattern to detect intersection between two shapes

由 房东的猫 提交于 2019-12-08 13:09:02
问题 I realize this is a very specific question so it would be helpful if the answer people give includes explicit codes on how to do this. Thanks. I have an abstract base class Shape: class Shape { ..... virtual bool GetIntersection(Shape* _shape) = 0; } class Circle : public Shape {...} class Triangle : public Shape {...} Both these derived classes overrides GetIntersection; I have: //main.cpp .... Shape* shape; Shape* circle = new Circle; if(input == 0) shape = new Circle; else shape = new

Line intersection transversal

由 為{幸葍}努か 提交于 2019-12-08 11:02:06
问题 I have several random line segments. I have to check if there is any intersection between any two line segments. Lines may be connected or not. What would be a good algorithm for this problem? 回答1: Assuming you're talking about line segments here (otherwise, simply compare the slopes of the lines: if they have unequal slopes, they intersect). To find out if a [single] intersection exists in a set of 2 or more line segments, you can use the Shamos-Hoey algorithm. To find all intersections in a

C#: Range intersection when endpoints are null (infinity)

由 坚强是说给别人听的谎言 提交于 2019-12-08 07:28:29
Ok, I have these intersection methods to work with ranges, and they work well as long as the range endpoints are not null: public static bool Intersects<T>(this Range<T> first, Range<T> second, IComparer<T> comparer) { return comparer.Compare(first.Start, second.End) <= 0 && comparer.Compare(first.End, second.Start) >= 0; } public static Range<T> GetIntersectionWith<T>(this Range<T> first, Range<T> second, IComparer<T> comparer) { // Return null, if any range is null or if they don't intersect at all if (first == null || second == null || !Intersects(first, second, comparer)) return null; var

C#: Range intersection when endpoints are null (infinity)

由 有些话、适合烂在心里 提交于 2019-12-08 06:55:01
问题 Ok, I have these intersection methods to work with ranges, and they work well as long as the range endpoints are not null: public static bool Intersects<T>(this Range<T> first, Range<T> second, IComparer<T> comparer) { return comparer.Compare(first.Start, second.End) <= 0 && comparer.Compare(first.End, second.Start) >= 0; } public static Range<T> GetIntersectionWith<T>(this Range<T> first, Range<T> second, IComparer<T> comparer) { // Return null, if any range is null or if they don't

LINQ Set Operations not working (Intersect, Except)

由 倖福魔咒の 提交于 2019-12-08 05:20:54
问题 I'd like to use the Uber-Coolness of LINQ set operations to express the following : foreach (Group group in groups) { if (user.Groups.Contains(group)) { assignedGroups.Add(group); } else { availableGroups.Add(group); } } I thought it should be a two-liner achieving this : var assigned = user.Groups.Intersect(groups); var available = groups.Except(user.Groups); Whenever I run this example the foreach approach fills my lists correctly, while the set operations result in an empty assigned list

Raphael.js create transparency through the intersection of multiple object

由 邮差的信 提交于 2019-12-08 03:38:01
问题 I'm creating an "amazing" effect to show a product (that brilliant 'absolutedy need it' from the customer!). I've already realized the effect http://jsfiddle.net/EMpQd/9/ (it's easier to see than to explain). My problem is: setting a rectangle in the background, and then a circle on top of it, I need to get transparency not only in the circle, but also in the rectangle, in the section covered by the circle (aka the intersection). How I can achieve this? Is this possible with Raphael? code for
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