godot/scene/gui/gradient_edit.cpp
Rémi Verschelde a7f49ac9a1 Update copyright statements to 2020
Happy new year to the wonderful Godot community!

We're starting a new decade with a well-established, non-profit, free
and open source game engine, and tons of further improvements in the
pipeline from hundreds of contributors.

Godot will keep getting better, and we're looking forward to all the
games that the community will keep developing and releasing with it.
2020-01-01 11:16:22 +01:00

497 lines
14 KiB
C++

/*************************************************************************/
/* gradient_edit.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_edit.h"
#include "core/os/keyboard.h"
#ifdef TOOLS_ENABLED
#include "editor/editor_scale.h"
#define SPACING (3 * EDSCALE)
#define POINT_WIDTH (8 * EDSCALE)
#else
#define SPACING 3
#define POINT_WIDTH 8
#endif
GradientEdit::GradientEdit() {
grabbed = -1;
grabbing = false;
set_focus_mode(FOCUS_ALL);
popup = memnew(PopupPanel);
picker = memnew(ColorPicker);
popup->add_child(picker);
add_child(popup);
checker = Ref<ImageTexture>(memnew(ImageTexture));
Ref<Image> img = memnew(Image(checker_bg_png));
checker->create_from_image(img, ImageTexture::FLAG_REPEAT);
}
int GradientEdit::_get_point_from_pos(int x) {
int result = -1;
int total_w = get_size().width - get_size().height - SPACING;
float min_distance = 1e20;
for (int i = 0; i < points.size(); i++) {
//Check if we clicked at point
float distance = ABS(x - points[i].offset * total_w);
float min = (POINT_WIDTH / 2 * 1.7); //make it easier to grab
if (distance <= min && distance < min_distance) {
result = i;
min_distance = distance;
}
}
return result;
}
void GradientEdit::_show_color_picker() {
if (grabbed == -1)
return;
picker->set_pick_color(points[grabbed].color);
Size2 minsize = popup->get_combined_minimum_size();
bool show_above = false;
if (get_global_position().y + get_size().y + minsize.y > get_viewport_rect().size.y) {
show_above = true;
}
if (show_above) {
popup->set_position(get_global_position() - Vector2(0, minsize.y));
} else {
popup->set_position(get_global_position() + Vector2(0, get_size().y));
}
popup->popup();
}
GradientEdit::~GradientEdit() {
}
void GradientEdit::_gui_input(const Ref<InputEvent> &p_event) {
Ref<InputEventKey> k = p_event;
if (k.is_valid() && k->is_pressed() && k->get_scancode() == KEY_DELETE && grabbed != -1) {
points.remove(grabbed);
grabbed = -1;
grabbing = false;
update();
emit_signal("ramp_changed");
accept_event();
}
Ref<InputEventMouseButton> mb = p_event;
//Show color picker on double click.
if (mb.is_valid() && mb->get_button_index() == 1 && mb->is_doubleclick() && mb->is_pressed()) {
grabbed = _get_point_from_pos(mb->get_position().x);
_show_color_picker();
accept_event();
}
//Delete point on right click
if (mb.is_valid() && mb->get_button_index() == 2 && mb->is_pressed()) {
grabbed = _get_point_from_pos(mb->get_position().x);
if (grabbed != -1) {
points.remove(grabbed);
grabbed = -1;
grabbing = false;
update();
emit_signal("ramp_changed");
accept_event();
}
}
//Hold alt key to duplicate selected color
if (mb.is_valid() && mb->get_button_index() == 1 && mb->is_pressed() && mb->get_alt()) {
int x = mb->get_position().x;
grabbed = _get_point_from_pos(x);
if (grabbed != -1) {
int total_w = get_size().width - get_size().height - SPACING;
Gradient::Point newPoint = points[grabbed];
newPoint.offset = CLAMP(x / float(total_w), 0, 1);
points.push_back(newPoint);
points.sort();
for (int i = 0; i < points.size(); ++i) {
if (points[i].offset == newPoint.offset) {
grabbed = i;
break;
}
}
emit_signal("ramp_changed");
update();
}
}
//select
if (mb.is_valid() && mb->get_button_index() == 1 && mb->is_pressed()) {
update();
int x = mb->get_position().x;
int total_w = get_size().width - get_size().height - SPACING;
//Check if color selector was clicked.
if (x > total_w + SPACING) {
_show_color_picker();
return;
}
grabbing = true;
grabbed = _get_point_from_pos(x);
//grab or select
if (grabbed != -1) {
return;
}
//insert
Gradient::Point newPoint;
newPoint.offset = CLAMP(x / float(total_w), 0, 1);
Gradient::Point prev;
Gradient::Point next;
int pos = -1;
for (int i = 0; i < points.size(); i++) {
if (points[i].offset < newPoint.offset)
pos = i;
}
if (pos == -1) {
prev.color = Color(0, 0, 0);
prev.offset = 0;
if (points.size()) {
next = points[0];
} else {
next.color = Color(1, 1, 1);
next.offset = 1.0;
}
} else {
if (pos == points.size() - 1) {
next.color = Color(1, 1, 1);
next.offset = 1.0;
} else {
next = points[pos + 1];
}
prev = points[pos];
}
newPoint.color = prev.color.linear_interpolate(next.color, (newPoint.offset - prev.offset) / (next.offset - prev.offset));
points.push_back(newPoint);
points.sort();
for (int i = 0; i < points.size(); i++) {
if (points[i].offset == newPoint.offset) {
grabbed = i;
break;
}
}
emit_signal("ramp_changed");
}
if (mb.is_valid() && mb->get_button_index() == 1 && !mb->is_pressed()) {
if (grabbing) {
grabbing = false;
emit_signal("ramp_changed");
}
update();
}
Ref<InputEventMouseMotion> mm = p_event;
if (mm.is_valid() && grabbing) {
int total_w = get_size().width - get_size().height - SPACING;
int x = mm->get_position().x;
float newofs = CLAMP(x / float(total_w), 0, 1);
// Snap to "round" coordinates if holding Ctrl.
// Be more precise if holding Shift as well
if (mm->get_control()) {
newofs = Math::stepify(newofs, mm->get_shift() ? 0.025 : 0.1);
} else if (mm->get_shift()) {
// Snap to nearest point if holding just Shift
const float snap_threshold = 0.03;
float smallest_ofs = snap_threshold;
bool found = false;
int nearest_point = 0;
for (int i = 0; i < points.size(); ++i) {
if (i != grabbed) {
float temp_ofs = ABS(points[i].offset - newofs);
if (temp_ofs < smallest_ofs) {
smallest_ofs = temp_ofs;
nearest_point = i;
if (found)
break;
found = true;
}
}
}
if (found) {
if (points[nearest_point].offset < newofs)
newofs = points[nearest_point].offset + 0.00001;
else
newofs = points[nearest_point].offset - 0.00001;
newofs = CLAMP(newofs, 0, 1);
}
}
bool valid = true;
for (int i = 0; i < points.size(); i++) {
if (points[i].offset == newofs && i != grabbed) {
valid = false;
break;
}
}
if (!valid || grabbed == -1) {
return;
}
points.write[grabbed].offset = newofs;
points.sort();
for (int i = 0; i < points.size(); i++) {
if (points[i].offset == newofs) {
grabbed = i;
break;
}
}
emit_signal("ramp_changed");
update();
}
}
void GradientEdit::_notification(int p_what) {
if (p_what == NOTIFICATION_ENTER_TREE) {
if (!picker->is_connected("color_changed", this, "_color_changed")) {
picker->connect("color_changed", this, "_color_changed");
}
}
if (p_what == NOTIFICATION_DRAW) {
int w = get_size().x;
int h = get_size().y;
if (w == 0 || h == 0)
return; //Safety check. We have division by 'h'. And in any case there is nothing to draw with such size
int total_w = get_size().width - get_size().height - SPACING;
//Draw checker pattern for ramp
_draw_checker(0, 0, total_w, h);
//Draw color ramp
Gradient::Point prev;
prev.offset = 0;
if (points.size() == 0)
prev.color = Color(0, 0, 0); //Draw black rectangle if we have no points
else
prev.color = points[0].color; //Extend color of first point to the beginning.
for (int i = -1; i < points.size(); i++) {
Gradient::Point next;
//If there is no next point
if (i + 1 == points.size()) {
if (points.size() == 0)
next.color = Color(0, 0, 0); //Draw black rectangle if we have no points
else
next.color = points[i].color; //Extend color of last point to the end.
next.offset = 1;
} else {
next = points[i + 1];
}
if (prev.offset == next.offset) {
prev = next;
continue;
}
Vector<Vector2> points;
Vector<Color> colors;
points.push_back(Vector2(prev.offset * total_w, h));
points.push_back(Vector2(prev.offset * total_w, 0));
points.push_back(Vector2(next.offset * total_w, 0));
points.push_back(Vector2(next.offset * total_w, h));
colors.push_back(prev.color);
colors.push_back(prev.color);
colors.push_back(next.color);
colors.push_back(next.color);
draw_primitive(points, colors, Vector<Point2>());
prev = next;
}
//Draw point markers
for (int i = 0; i < points.size(); i++) {
Color col = points[i].color.contrasted();
col.a = 0.9;
draw_line(Vector2(points[i].offset * total_w, 0), Vector2(points[i].offset * total_w, h / 2), col);
Rect2 rect = Rect2(points[i].offset * total_w - POINT_WIDTH / 2, h / 2, POINT_WIDTH, h / 2);
draw_rect(rect, points[i].color, true);
draw_rect(rect, col, false);
if (grabbed == i) {
rect = rect.grow(-1);
if (has_focus()) {
draw_rect(rect, Color(1, 0, 0, 0.9), false);
} else {
draw_rect(rect, Color(0.6, 0, 0, 0.9), false);
}
rect = rect.grow(-1);
draw_rect(rect, col, false);
}
}
//Draw "button" for color selector
_draw_checker(total_w + SPACING, 0, h, h);
if (grabbed != -1) {
//Draw with selection color
draw_rect(Rect2(total_w + SPACING, 0, h, h), points[grabbed].color);
} else {
//if no color selected draw grey color with 'X' on top.
draw_rect(Rect2(total_w + SPACING, 0, h, h), Color(0.5, 0.5, 0.5, 1));
draw_line(Vector2(total_w + SPACING, 0), Vector2(total_w + SPACING + h, h), Color(1, 1, 1, 0.6));
draw_line(Vector2(total_w + SPACING, h), Vector2(total_w + SPACING + h, 0), Color(1, 1, 1, 0.6));
}
//Draw borders around color ramp if in focus
if (has_focus()) {
draw_line(Vector2(-1, -1), Vector2(total_w + 1, -1), Color(1, 1, 1, 0.6));
draw_line(Vector2(total_w + 1, -1), Vector2(total_w + 1, h + 1), Color(1, 1, 1, 0.6));
draw_line(Vector2(total_w + 1, h + 1), Vector2(-1, h + 1), Color(1, 1, 1, 0.6));
draw_line(Vector2(-1, -1), Vector2(-1, h + 1), Color(1, 1, 1, 0.6));
}
}
if (p_what == NOTIFICATION_VISIBILITY_CHANGED) {
if (!is_visible()) {
grabbing = false;
}
}
}
void GradientEdit::_draw_checker(int x, int y, int w, int h) {
//Draw it with polygon to insert UVs for scale
Vector<Vector2> backPoints;
backPoints.push_back(Vector2(x, y));
backPoints.push_back(Vector2(x, y + h));
backPoints.push_back(Vector2(x + w, y + h));
backPoints.push_back(Vector2(x + w, y));
Vector<Color> colorPoints;
colorPoints.push_back(Color(1, 1, 1, 1));
colorPoints.push_back(Color(1, 1, 1, 1));
colorPoints.push_back(Color(1, 1, 1, 1));
colorPoints.push_back(Color(1, 1, 1, 1));
Vector<Vector2> uvPoints;
//Draw checker pattern pixel-perfect and scale it by 2.
uvPoints.push_back(Vector2(x, y));
uvPoints.push_back(Vector2(x, y + h * .5f / checker->get_height()));
uvPoints.push_back(Vector2(x + w * .5f / checker->get_width(), y + h * .5f / checker->get_height()));
uvPoints.push_back(Vector2(x + w * .5f / checker->get_width(), y));
draw_polygon(backPoints, colorPoints, uvPoints, checker);
}
Size2 GradientEdit::get_minimum_size() const {
return Vector2(0, 16);
}
void GradientEdit::_color_changed(const Color &p_color) {
if (grabbed == -1)
return;
points.write[grabbed].color = p_color;
update();
emit_signal("ramp_changed");
}
void GradientEdit::set_ramp(const Vector<float> &p_offsets, const Vector<Color> &p_colors) {
ERR_FAIL_COND(p_offsets.size() != p_colors.size());
points.clear();
for (int i = 0; i < p_offsets.size(); i++) {
Gradient::Point p;
p.offset = p_offsets[i];
p.color = p_colors[i];
points.push_back(p);
}
points.sort();
update();
}
Vector<float> GradientEdit::get_offsets() const {
Vector<float> ret;
for (int i = 0; i < points.size(); i++)
ret.push_back(points[i].offset);
return ret;
}
Vector<Color> GradientEdit::get_colors() const {
Vector<Color> ret;
for (int i = 0; i < points.size(); i++)
ret.push_back(points[i].color);
return ret;
}
void GradientEdit::set_points(Vector<Gradient::Point> &p_points) {
if (points.size() != p_points.size())
grabbed = -1;
points.clear();
points = p_points;
}
Vector<Gradient::Point> &GradientEdit::get_points() {
return points;
}
void GradientEdit::_bind_methods() {
ClassDB::bind_method(D_METHOD("_gui_input"), &GradientEdit::_gui_input);
ClassDB::bind_method(D_METHOD("_color_changed"), &GradientEdit::_color_changed);
ADD_SIGNAL(MethodInfo("ramp_changed"));
}