I want to check if a specified corrdinate is inside an area closed under curve. My curve line is generated as follows:
float CtlPoint[] =
{
0, -0.3, 0,
0.15, -0.25, 0,
0.6, -0.2, 0,
0.2, 0.20, 0,
0.10, 0.25, 0,
0.05, 0.5, 0,
0.02, 0.6, 0,
0.0, 0.8, 0,
-0.02, 0.6, 0,
-0.05, 0.5, 0,
-0.10, 0.25, 0,
-0.2, 0.20, 0,
-0.6, -0.2, 0,
-0.15, -0.25, 0,
0, -0.3, 0
};
glMap1f(GL_MAP1_VERTEX_3, 0.0, 1.0, 3, 15, CtlPoint);
glEnable(GL_MAP1_VERTEX_3);
glBegin(GL_LINE_STRIP);
for (int t = 0; t <= 100; ++t){
glEvalCoord1f(static_cast<float>(t) / 100);
}
glEnd();
I randomly generate 2 float numbers x and y and want to test a coordinate using those two values is inside the curve line specified above.
Capture the eval output via your favorite method and use a standard point-in-polygon test.