#SFML-splitquad

Some way to split SFML quads (4 vertices array) into 2. CODE IS MESSY AND BUGGY AS HELL -> THIS IS A PROTOTYPE

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How to use it ?

First include both geometry.h and edgePoly.h files (will be changed in future version)

Then create an array of 4 vertices (Quad)

Vertex square[4] =
{

    Vertex(Vector2f(0, 0), Color::Green),
    Vertex(Vector2f(100, 0), Color::Green),
    Vertex(Vector2f(100, 100), Color::Green),
    Vertex(Vector2f(0, 100), Color::Green)

};

Then create an edgePoly object with your VertexArray as argument

edgePoly poly(square);

Then you will need a Line object to cut the Quad, a line is defined using 2 Vector2f, MAKE SURE THE LINE IS NOT STOPPING IN THE QUAD OR BAD STUFF WILL HAPPEN.

Line cutLine(Vector2f(100, 0), Vector2f(0, 100));

Then you can create the polygons by doing

poly.split(cutLine);

note that this is a void method.

Then you can take poly.smallPoly and poly.bigPoly

THESE NAMES ARE HORRIBLE I KNOW, I DON'T KNOW HOW TO EXPORT THEM CORRECTLY FOR NOW, I'M THINKING OF IT. AND ALSO THE COLOR OF THEM WILL ALWAYS BE WHITE, FOR THE SAME REASON

These polys are either (depends on how the line cuts the quad) :

• 3 vertices array (smallPoly) and 5 vertices array (bigPoly) or
• 4 vertices array for both smallPoly and bigPoly

This is very bad I know don't yell at me please.

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Concerning the Line class

The Line class is basically just two Vector2f, but you have some static methods to use, these are only in the geometry.h file. And the code is less messy.

Know if two line intersect :

Here's the definition:

static bool doIntersect(const Line& line1, const Line& line2);

Example:

bool linesIntersect = Line::doIntersect(line1, line2);

Know the intersection point of two lines :

Here's the definition :

static Vector2f getIntersecPoint(const Line& line1, const Line& line2);

Example :

Vector2f intersectionPoint = Line::getIntersecPoint(line1, line2);

Note : if there is none, the method will return "null2f", that is just a Vector2f(NULL, NULL)

Know if a point is on a segment :

Here's the definition : static bool IsOnSegment(Line line, Vector2f k);

Example :

bool onSegment = Line::IsOnSegment(line, point);

Know if two lines are connected :

Here's the definition :

    static bool areConnected(Line* a, Line* b);

Please note there are pointers.

Example :

bool linesConnected = Line::areConnected(&line1, &line2);