Method: CP.poly_area

Defined in:
ext/chipmunk/rb_chipmunk.c

.poly_area(arr) ⇒ Object 



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# File 'ext/chipmunk/rb_chipmunk.c', line 95

static VALUE
rb_cpAreaForPoly(VALUE self, VALUE arr) {
  Check_Type(arr, T_ARRAY);
  // TODO do not cast... use stdint.h in chipmunk
  int numVerts   = (int)RARRAY_LEN(arr);
  VALUE *ary_ptr = RARRAY_PTR(arr);
  cpVect verts[numVerts];

  for(int i = 0; i < numVerts; i++) { 
    verts[i] = *VGET(ary_ptr[i]);
  }
  cpFloat area   = cpAreaForPoly(numVerts, verts);
  return rb_float_new(area);
}