Unigine.Math2d Struct
Math2d Class
Members
bool SetPolygonToCCW ( List<vec2> points ) #
Sets the counter-clockwise orientation for the polygon.Arguments
- List<vec2> points - List containing all points of the polygon.
Return value
true if the counter-clockwise orientation for the polygon is set successfully; otherwise, false.void TriangulatePolygon ( List<vec2> points, List<ushort> indices, bool append_to_result ) #
Performs triangulation by ear clipping algorithm (complexity: O(n^2)/O(n)).Arguments
- List<vec2> points - List containing all points of the polygon.
- List<ushort> indices - List containing all points indices.
- bool append_to_result - Flag indicating if resulting points should be appended to the points of initial polygon - false (the default value), or replace them - true.
void ResizePolygon ( List<vec2> points, float offset, List<vec2> result_points, bool append_to_result ) #
Returns a set of points representing a shrunk/enlarged polygon. Supports concave polygons, CCW and CW orientations.Arguments
- List<vec2> points - List containing all points of the polygon.
- float offset
- List<vec2> result_points - List containing all points of the shrunk/enlarged polygon.
- bool append_to_result - Flag indicating if resulting points should be appended to the points of initial polygon - false (the default value), or replace them - true.
void FindIntersection ( vec2 p1, vec2 p2, vec2 p3, vec2 p4, bool lines_intersect, bool segments_intersect, vec2 intersection, vec2 close_p1, vec2 close_p2 ) #
Finds the point of intersection between the two lines specified by the pairs of points p1 - p2 and p3 - p4 and sets the values of the last 5 arguments.Arguments
- vec2 p1 - Start point coordinates of the first line segment.
- vec2 p2 - End point coordinates of the first line segment.
- vec2 p3 - Start point coordinates of the second line segment.
- vec2 p4 - End point coordinates of the second line segment.
- bool lines_intersect - true if the lines to which the segments belong intersect; otherwise, false.
- bool segments_intersect - true if the lines to which the segments belong intersect; otherwise, false.
- vec2 intersection - Coordinates of the point of intersection between the two line segments.
- vec2 close_p1 - Coordinates of the first of the two closest points belonging to the first segment.
- vec2 close_p2 - Coordinates of the second of the two closest points belonging to the second segment.
bool PolygonIsOrientedClockwise ( List<vec2> points ) #
Returns a value indicating if a given polygon is oriented clockwise.Arguments
- List<vec2> points - List containing all points of the polygon.
Return value
true if a given polygon is oriented clockwise; otherwise, false.float GetPolygonAreaSigned ( List<vec2> points ) #
Returns the area of the given polygon in square units.Arguments
- List<vec2> points - List containing all points of the polygon.
Return value
Polygon's area, in square units.
The value will be negative if the polygon is oriented clockwise.
float GetPolygonArea ( List<vec2> points ) #
Returns the area of the given polygon in square units.Arguments
- List<vec2> points - List containing all points of the polygon.
Return value
Polygon's area, in square units.float GetTriangleArea ( vec2 p1, vec2 p2, vec2 p3 ) #
Returns the area of the given triangle in square units.Arguments
- vec2 p1 - Coordinates of the first triangle vertex.
- vec2 p2 - Coordinates of the second triangle vertex.
- vec2 p3 - Coordinates of the third triangle vertex.
Return value
Triangle area, in square units.
The value will be negative if the polygon is oriented clockwise.
float Sign ( vec2 point, vec2 segment_p1, vec2 segment_p2 ) #
Returns an integral value indicating the sign of an argument.Arguments
- vec2 point - Coordinates of the point to be checked.
- vec2 segment_p1 - Segment start point coordinates.
- vec2 segment_p2 - Segment end point coordinates.
Return value
Resulting float value.bool PointTriangleInside ( vec2 point, vec2 v0, vec2 v1, vec2 v2 ) #
Checks if a point is inside a triangle.Arguments
- vec2 point - Coordinates of the point to be checked.
- vec2 v0 - Coordinates of the first triangle vertex.
- vec2 v1 - Coordinates of the second triangle vertex.
- vec2 v2 - Coordinates of the third triangle vertex.
Return value
true if a given point is inside the specified triangle; otherwise, false.Last update:
2024-08-16
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