In Delphi, you can create multipoint collision detection by defining a data structure to represent each object that can collide with other objects, and then implementing an algorithm to check for collisions between pairs of objects.
One approach to implementing multipoint collision detection is to use a polygon as the shape of each object, and then use a polygon intersection algorithm to check for collisions between pairs of objects. You can then define the polygon for each object using a set of vertices, and use these vertices to calculate the edges of the polygon.
To check for collisions between two objects, you can iterate over the vertices of each object’s polygon and check whether any of the vertices of one object fall within the other object’s polygon. If a vertex of one object is found to be inside the other object’s polygon, then a collision has occurred.
Here is some sample code that demonstrates how you might implement multipoint collision detection using polygons in Delphi:
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type TPolygon = array of TPoint; function PolygonCollision(const Poly1, Poly2: TPolygon): Boolean; var I, J: Integer; begin Result := False; for I := Low(Poly1) to High(Poly1) do begin if PointInPolygon(Poly2, Poly1[I]) then begin Result := True; Exit; end; end; for I := Low(Poly2) to High(Poly2) do begin if PointInPolygon(Poly1, Poly2[I]) then begin Result := True; Exit; end; end; end; function PointInPolygon(const Poly: TPolygon; const P: TPoint): Boolean; var I, J: Integer; c: Boolean; begin c := False; for I := Low(Poly) to High(Poly) do begin J := (I + 1) mod Length(Poly); if ((Poly[I].Y > P.Y) <> (Poly[J].Y > P.Y)) and (P.X < (Poly[J].X – Poly[I].X) * (P.Y – Poly[I].Y) / (Poly[J].Y – Poly[I].Y) + Poly[I].X) then begin c := not c; end; end; Result := c; end; |
This code defines a TPolygon type as an array of TPoint values, and provides two functions: PolygonCollision and PointInPolygon. The PolygonCollision function takes two polygons as input and returns True if a collision is detected between the two polygons, and False otherwise. The PointInPolygon function takes a polygon and a point as input and returns True if the point is inside the polygon, and False otherwise.
To use this code to detect collisions between two objects, you would simply define the polygons for each object using a set of vertices, and then call the PolygonCollision function with the two polygons as arguments. If the function returns True, then a collision has occurred.
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