For your plan B (to center the text within the triangle both vertically and horizontally), which I prefer as solution, you could add this css rule: .up p { text-align: center; top: 80px; left: -47px; position: relative; width: 93px; height: 93px; margin: 0px; } Try it here: .up { width: 0px; height: 0px; border-style: inset; … Read more
The cube algorithm will not give an even distribution over the sphere – in particular the areas near the projections of the corners will have the densest distribution of points and near the centers of the faces of the cubes will be the lowest. You can understand this intuitively since the volume of cube projected … Read more
I solve this problem adding to ‘application.properties’ this line: spring.jpa.properties.hibernate.dialect=org.hibernate.spatial.dialect.postgis.PostgisDialect
How can I perform Collision Detection on rotated rectangles? [closed]
Easiest way to do it is cast a ray from that point and count how many times it crosses the boundary. If it is odd, the point is inside, even the point is outside. Wiki: http://en.wikipedia.org/wiki/Point_in_polygon Note that this only works for manifold shapes.
First I will remind us how to find the area of a polygon. Once we have done this, the algorithm to find the intersection between a polygon and a circle should be easy to understand. How to find the area of a polygon Let’s look at the case of a triangle, because all the essential … Read more
Ok, I’m going to give you a cookbook method to do this. If you’re interested in how I derived it, see http://www.sdmath.com/math/geometry/reflection_across_line.html#formulasmb Given point (x1, y1) and a line that passes through (x2,y2) and (x3,y3), we can first define the line as y = mx + c, where: slope m is (y3-y2)/(x3-x2) y-intercept c is … Read more
Most 3D lines do not intersect. A reliable method is to find the shortest line between two 3D lines. If the shortest line has a length of zero (or distance less than whatever tolerance you specify) then you know that the two original lines intersect. A method for finding the shortest line between two 3D … Read more
You can use any coordinate pair on the same side to calculate the rotation angle. Note that mathematic angles normally assume 0 as long the +ve X axis and increase by rotating anti–clockwise (so along the +ve Y axis is 90°, -ve X axis is 180° and so on). Also, javascript trigonometry functions return values … Read more
Here’s my Java port, dodging the error condition when the determinant disappears with a very elegant IllegalArgumentException, my approach to coping with the “points are two far apart” or “points lie on a line” conditions. Also, this computes the radius (and copes with exceptional conditions) which your intersecting-slopes approach will not do. public class CircleThree … Read more