text: /*************************************************************************/
  /*  gradient.cpp                                                         */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  #include "gradient.h"
  
  #include "core/core_string_names.h"
  
  //setter and getter names for property serialization
  #define COLOR_RAMP_GET_OFFSETS "get_offsets"
  #define COLOR_RAMP_GET_COLORS "get_colors"
  #define COLOR_RAMP_SET_OFFSETS "set_offsets"
  #define COLOR_RAMP_SET_COLORS "set_colors"
  
  Gradient::Gradient() {
  	//Set initial color ramp transition from black to white
  	points.resize(2);
  	points.write[0].color = Color(0, 0, 0, 1);
  	points.write[0].offset = 0;
  	points.write[1].color = Color(1, 1, 1, 1);
  	points.write[1].offset = 1;
  	is_sorted = true;
  }
  
  Gradient::~Gradient() {
  }
  
  void Gradient::_bind_methods() {
  	ClassDB::bind_method(D_METHOD("add_point", "offset", "color"), &Gradient::add_point);
  	ClassDB::bind_method(D_METHOD("remove_point", "offset"), &Gradient::remove_point);
  
  	ClassDB::bind_method(D_METHOD("set_offset", "point", "offset"), &Gradient::set_offset);
  	ClassDB::bind_method(D_METHOD("get_offset", "point"), &Gradient::get_offset);
  
  	ClassDB::bind_method(D_METHOD("set_color", "point", "color"), &Gradient::set_color);
  	ClassDB::bind_method(D_METHOD("get_color", "point"), &Gradient::get_color);
  
  	ClassDB::bind_method(D_METHOD("interpolate", "offset"), &Gradient::get_color_at_offset);
  
  	ClassDB::bind_method(D_METHOD("get_point_count"), &Gradient::get_points_count);
  
  	ClassDB::bind_method(D_METHOD(COLOR_RAMP_SET_OFFSETS, "offsets"), &Gradient::set_offsets);
  	ClassDB::bind_method(D_METHOD(COLOR_RAMP_GET_OFFSETS), &Gradient::get_offsets);
  
  	ClassDB::bind_method(D_METHOD(COLOR_RAMP_SET_COLORS, "colors"), &Gradient::set_colors);
  	ClassDB::bind_method(D_METHOD(COLOR_RAMP_GET_COLORS), &Gradient::get_colors);
  
  	ADD_PROPERTY(PropertyInfo(Variant::PACKED_FLOAT32_ARRAY, "offsets"), COLOR_RAMP_SET_OFFSETS, COLOR_RAMP_GET_OFFSETS);
  	ADD_PROPERTY(PropertyInfo(Variant::PACKED_COLOR_ARRAY, "colors"), COLOR_RAMP_SET_COLORS, COLOR_RAMP_GET_COLORS);
  }
  
  Vector<float> Gradient::get_offsets() const {
  	Vector<float> offsets;
  	offsets.resize(points.size());
  	for (int i = 0; i < points.size(); i++) {
  		offsets.write[i] = points[i].offset;
  	}
  	return offsets;
  }
  
  Vector<Color> Gradient::get_colors() const {
  	Vector<Color> colors;
  	colors.resize(points.size());
  	for (int i = 0; i < points.size(); i++) {
  		colors.write[i] = points[i].color;
  	}
  	return colors;
  }
  
  void Gradient::set_offsets(const Vector<float> &p_offsets) {
  	points.resize(p_offsets.size());
  	for (int i = 0; i < points.size(); i++) {
  		points.write[i].offset = p_offsets[i];
  	}
  	is_sorted = false;
  	emit_signal(CoreStringNames::get_singleton()->changed);
  }
  
  void Gradient::set_colors(const Vector<Color> &p_colors) {
  	if (points.size() < p_colors.size()) {
  		is_sorted = false;
  	}
  	points.resize(p_colors.size());
  	for (int i = 0; i < points.size(); i++) {
  		points.write[i].color = p_colors[i];
  	}
  	emit_signal(CoreStringNames::get_singleton()->changed);
  }
  
  Vector<Gradient::Point> &Gradient::get_points() {
  	return points;
  }
  
  void Gradient::add_point(float p_offset, const Color &p_color) {
  	Point p;
  	p.offset = p_offset;
  	p.color = p_color;
  	is_sorted = false;
  	points.push_back(p);
  
  	emit_signal(CoreStringNames::get_singleton()->changed);
  }
  
  void Gradient::remove_point(int p_index) {
  	ERR_FAIL_INDEX(p_index, points.size());
  	ERR_FAIL_COND(points.size() <= 2);
  	points.remove(p_index);
  	emit_signal(CoreStringNames::get_singleton()->changed);
  }
  
  void Gradient::set_points(Vector<Gradient::Point> &p_points) {
  	points = p_points;
  	is_sorted = false;
  	emit_signal(CoreStringNames::get_singleton()->changed);
  }
  
  void Gradient::set_offset(int pos, const float offset) {
  	ERR_FAIL_COND(pos < 0);
  	if (points.size() <= pos) {
  		points.resize(pos + 1);
  	}
  	points.write[pos].offset = offset;
  	is_sorted = false;
  	emit_signal(CoreStringNames::get_singleton()->changed);
  }
  
  float Gradient::get_offset(int pos) const {
  	ERR_FAIL_INDEX_V(pos, points.size(), 0.0);
  	return points[pos].offset;
  }
  
  void Gradient::set_color(int pos, const Color &color) {
  	ERR_FAIL_COND(pos < 0);
  	if (points.size() <= pos) {
  		points.resize(pos + 1);
  		is_sorted = false;
  	}
  	points.write[pos].color = color;
  	emit_signal(CoreStringNames::get_singleton()->changed);
  }
  
  Color Gradient::get_color(int pos) const {
  	ERR_FAIL_INDEX_V(pos, points.size(), Color());
  	return points[pos].color;
  }
  
  int Gradient::get_points_count() const {
  	return points.size();
  }
  