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godot/scene/gui/gradient_edit.cpp

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/*************************************************************************/
/* gradient_edit.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 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"));
}
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