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Imlib2::Gradient

Public Class Methods

new(*args) click to toggle source

Return a new Imlib2::Gradient.

Examples:

# create a blue to green gradient
grad = Imlib2::Gradient.new
grad.add_color 0, Imlib2::Color::BLUE
grad.add_color 100, Imlib2::Color::GREEN

# create a red to yellow to black gradient
colors = [ [0,   Imlib2::Color::RED    ], 
           [100, Imlib2::Color::YELLOW ],
           [200, Imlib2::Color::BLACK  ] ]
grad = Imlib2::Gradient.new *colors
VALUE gradient_new(int argc, VALUE *argv, VALUE klass) {
  Imlib_Color_Range *range;
  VALUE g_o;
  
  range = malloc(sizeof(Imlib_Color_Range*));
  *range = imlib_create_color_range();

  g_o = Data_Wrap_Struct(klass, 0, gradient_free, range);
  rb_obj_call_init(g_o, argc, argv);

  return g_o;
}

Public Instance Methods

add_color(p1, p2) click to toggle source

Add a color at the given distance

Examples:

# add the context color with a 100 pixel offset
grad.add_color 100

# add white at a 100 pixel offset
grad.add_color 100, Imlib2::Color::WHITE
static VALUE gradient_add_color(int argc, VALUE *argv, VALUE self) {
  Imlib_Color_Range *grad;
  VALUE color = Qnil;
  int distance;

  switch (argc) {
    case 1:
      distance = NUM2INT(argv[0]);
      break;
    case 2:
      distance = NUM2INT(argv[0]);
      color = argv[1];
      break;
    default:
      rb_raise(rb_eTypeError, "Invalid argument count (not 1 or 2)");
  }

  Data_Get_Struct(self, Imlib_Color_Range, grad);
  imlib_context_set_color_range(*grad);

  if (color != Qnil)
    set_context_color(color);

  imlib_add_color_to_color_range(distance);

  return self;
}

[Validate]

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