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curve_editor_plugin.cpp
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/**************************************************************************/
/* curve_editor_plugin.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* 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 "curve_editor_plugin.h"
#include "canvas_item_editor_plugin.h"
#include "core/input/input.h"
#include "core/math/geometry_2d.h"
#include "core/os/keyboard.h"
#include "editor/editor_interface.h"
#include "editor/editor_node.h"
#include "editor/editor_settings.h"
#include "editor/editor_string_names.h"
#include "editor/editor_undo_redo_manager.h"
#include "editor/gui/editor_spin_slider.h"
#include "editor/themes/editor_scale.h"
#include "scene/gui/flow_container.h"
#include "scene/gui/menu_button.h"
#include "scene/gui/popup_menu.h"
#include "scene/gui/separator.h"
#include "scene/resources/image_texture.h"
CurveEdit::CurveEdit() {
set_focus_mode(FOCUS_ALL);
set_clip_contents(true);
}
void CurveEdit::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_selected_index", "index"), &CurveEdit::set_selected_index);
}
void CurveEdit::set_curve(Ref<Curve> p_curve) {
if (p_curve == curve) {
return;
}
if (curve.is_valid()) {
curve->disconnect_changed(callable_mp(this, &CurveEdit::_curve_changed));
curve->disconnect(Curve::SIGNAL_RANGE_CHANGED, callable_mp(this, &CurveEdit::_curve_changed));
curve->disconnect(Curve::SIGNAL_DOMAIN_CHANGED, callable_mp(this, &CurveEdit::_curve_changed));
}
curve = p_curve;
if (curve.is_valid()) {
curve->connect_changed(callable_mp(this, &CurveEdit::_curve_changed));
curve->connect(Curve::SIGNAL_RANGE_CHANGED, callable_mp(this, &CurveEdit::_curve_changed));
curve->connect(Curve::SIGNAL_DOMAIN_CHANGED, callable_mp(this, &CurveEdit::_curve_changed));
}
// Note: if you edit a curve, then set another, and try to undo,
// it will normally apply on the previous curve, but you won't see it.
}
Ref<Curve> CurveEdit::get_curve() {
return curve;
}
void CurveEdit::set_snap_enabled(bool p_enabled) {
snap_enabled = p_enabled;
queue_redraw();
if (curve.is_valid()) {
if (snap_enabled) {
curve->set_meta(SNAME("_snap_enabled"), true);
} else {
curve->remove_meta(SNAME("_snap_enabled"));
}
}
}
void CurveEdit::set_snap_count(int p_snap_count) {
snap_count = p_snap_count;
queue_redraw();
if (curve.is_valid()) {
if (snap_count != CurveEditor::DEFAULT_SNAP) {
curve->set_meta(SNAME("_snap_count"), snap_count);
} else {
curve->remove_meta(SNAME("_snap_count"));
}
}
}
Size2 CurveEdit::get_minimum_size() const {
return Vector2(64, MAX(135, get_size().x * ASPECT_RATIO)) * EDSCALE;
}
void CurveEdit::_notification(int p_what) {
switch (p_what) {
case NOTIFICATION_MOUSE_EXIT: {
if (hovered_index != -1 || hovered_tangent_index != TANGENT_NONE) {
hovered_index = -1;
hovered_tangent_index = TANGENT_NONE;
queue_redraw();
}
} break;
case NOTIFICATION_THEME_CHANGED: {
float gizmo_scale = EDITOR_GET("interface/touchscreen/scale_gizmo_handles");
point_radius = Math::round(BASE_POINT_RADIUS * get_theme_default_base_scale() * gizmo_scale);
hover_radius = Math::round(BASE_HOVER_RADIUS * get_theme_default_base_scale() * gizmo_scale);
tangent_radius = Math::round(BASE_TANGENT_RADIUS * get_theme_default_base_scale() * gizmo_scale);
tangent_hover_radius = Math::round(BASE_TANGENT_HOVER_RADIUS * get_theme_default_base_scale() * gizmo_scale);
tangent_length = Math::round(BASE_TANGENT_LENGTH * get_theme_default_base_scale());
} break;
case NOTIFICATION_DRAW: {
_redraw();
} break;
case NOTIFICATION_VISIBILITY_CHANGED: {
if (!is_visible()) {
grabbing = GRAB_NONE;
}
} break;
}
}
void CurveEdit::gui_input(const Ref<InputEvent> &p_event) {
ERR_FAIL_COND(p_event.is_null());
if (curve.is_null()) {
return;
}
Ref<InputEventKey> k = p_event;
if (k.is_valid()) {
// Deleting points or making tangents linear.
if (k->is_pressed() && k->get_keycode() == Key::KEY_DELETE) {
if (selected_tangent_index != TANGENT_NONE) {
toggle_linear(selected_index, selected_tangent_index);
} else if (selected_index != -1) {
if (grabbing == GRAB_ADD) {
curve->remove_point(selected_index); // Point is temporary, so remove directly from curve.
set_selected_index(-1);
} else {
remove_point(selected_index);
}
grabbing = GRAB_NONE;
hovered_index = -1;
hovered_tangent_index = TANGENT_NONE;
}
accept_event();
}
if (k->get_keycode() == Key::SHIFT || k->get_keycode() == Key::ALT) {
queue_redraw(); // Redraw to show the axes or constraints.
}
}
Ref<InputEventMouseButton> mb = p_event;
if (mb.is_valid() && mb->is_pressed()) {
Vector2 mpos = mb->get_position();
if (mb->get_button_index() == MouseButton::RIGHT || mb->get_button_index() == MouseButton::MIDDLE) {
if (mb->get_button_index() == MouseButton::RIGHT && grabbing == GRAB_MOVE) {
// Move a point to its old position.
curve->set_point_value(selected_index, initial_grab_pos.y);
curve->set_point_offset(selected_index, initial_grab_pos.x);
set_selected_index(initial_grab_index);
hovered_index = get_point_at(mpos);
grabbing = GRAB_NONE;
} else {
// Remove a point or make a tangent linear.
selected_tangent_index = get_tangent_at(mpos);
if (selected_tangent_index != TANGENT_NONE) {
toggle_linear(selected_index, selected_tangent_index);
} else {
int point_to_remove = get_point_at(mpos);
if (point_to_remove == -1) {
set_selected_index(-1); // Nothing on the place of the click, just deselect the point.
} else {
if (grabbing == GRAB_ADD) {
curve->remove_point(point_to_remove); // Point is temporary, so remove directly from curve.
set_selected_index(-1);
} else {
remove_point(point_to_remove);
}
hovered_index = get_point_at(mpos);
grabbing = GRAB_NONE;
}
}
}
}
// Selecting or creating points.
if (mb->get_button_index() == MouseButton::LEFT) {
if (grabbing == GRAB_NONE) {
selected_tangent_index = get_tangent_at(mpos);
if (selected_tangent_index == TANGENT_NONE) {
set_selected_index(get_point_at(mpos));
}
queue_redraw();
}
if (selected_index != -1) {
// If an existing point/tangent was grabbed, remember a few things about it.
grabbing = GRAB_MOVE;
initial_grab_pos = curve->get_point_position(selected_index);
initial_grab_index = selected_index;
if (selected_index > 0) {
initial_grab_left_tangent = curve->get_point_left_tangent(selected_index);
}
if (selected_index < curve->get_point_count() - 1) {
initial_grab_right_tangent = curve->get_point_right_tangent(selected_index);
}
} else if (grabbing == GRAB_NONE) {
// Adding a new point. Insert a temporary point for the user to adjust, so it's not in the undo/redo.
Vector2 new_pos = get_world_pos(mpos).clamp(Vector2(curve->get_min_domain(), curve->get_min_value()), Vector2(curve->get_max_domain(), curve->get_max_value()));
if (snap_enabled || mb->is_command_or_control_pressed()) {
new_pos.x = Math::snapped(new_pos.x - curve->get_min_domain(), curve->get_domain_range() / snap_count) + curve->get_min_domain();
new_pos.y = Math::snapped(new_pos.y - curve->get_min_value(), curve->get_value_range() / snap_count) + curve->get_min_value();
}
new_pos.x = get_offset_without_collision(selected_index, new_pos.x, mpos.x >= get_view_pos(new_pos).x);
// Add a temporary point for the user to adjust before adding it permanently.
int new_idx = curve->add_point_no_update(new_pos);
set_selected_index(new_idx);
grabbing = GRAB_ADD;
initial_grab_pos = new_pos;
}
}
}
if (mb.is_valid() && mb->get_button_index() == MouseButton::LEFT && !mb->is_pressed()) {
if (selected_tangent_index != TANGENT_NONE) {
// Finish moving a tangent control.
if (selected_index == 0) {
set_point_right_tangent(selected_index, curve->get_point_right_tangent(selected_index));
} else if (selected_index == curve->get_point_count() - 1) {
set_point_left_tangent(selected_index, curve->get_point_left_tangent(selected_index));
} else {
set_point_tangents(selected_index, curve->get_point_left_tangent(selected_index), curve->get_point_right_tangent(selected_index));
}
grabbing = GRAB_NONE;
} else if (grabbing == GRAB_MOVE) {
// Finish moving a point.
set_point_position(selected_index, curve->get_point_position(selected_index));
grabbing = GRAB_NONE;
} else if (grabbing == GRAB_ADD) {
// Finish inserting a new point. Remove the temporary point and insert a permanent one in its place.
Vector2 new_pos = curve->get_point_position(selected_index);
curve->remove_point(selected_index);
add_point(new_pos);
grabbing = GRAB_NONE;
}
queue_redraw();
}
Ref<InputEventMouseMotion> mm = p_event;
if (mm.is_valid()) {
Vector2 mpos = mm->get_position();
if (grabbing != GRAB_NONE && curve.is_valid()) {
if (selected_index != -1) {
if (selected_tangent_index == TANGENT_NONE) {
// Drag point.
Vector2 new_pos = get_world_pos(mpos).clamp(Vector2(curve->get_min_domain(), curve->get_min_value()), Vector2(curve->get_max_domain(), curve->get_max_value()));
if (snap_enabled || mm->is_command_or_control_pressed()) {
new_pos.x = Math::snapped(new_pos.x - curve->get_min_domain(), curve->get_domain_range() / snap_count) + curve->get_min_domain();
new_pos.y = Math::snapped(new_pos.y - curve->get_min_value(), curve->get_value_range() / snap_count) + curve->get_min_value();
}
// Allow to snap to axes with Shift.
if (mm->is_shift_pressed()) {
Vector2 initial_mpos = get_view_pos(initial_grab_pos);
if (Math::abs(mpos.x - initial_mpos.x) > Math::abs(mpos.y - initial_mpos.y)) {
new_pos.y = initial_grab_pos.y;
} else {
new_pos.x = initial_grab_pos.x;
}
}
// Allow to constraint the point between the adjacent two with Alt.
if (mm->is_alt_pressed()) {
float prev_point_offset = (selected_index > 0) ? (curve->get_point_position(selected_index - 1).x + 0.00001) : curve->get_min_domain();
float next_point_offset = (selected_index < curve->get_point_count() - 1) ? (curve->get_point_position(selected_index + 1).x - 0.00001) : curve->get_max_domain();
new_pos.x = CLAMP(new_pos.x, prev_point_offset, next_point_offset);
}
new_pos.x = get_offset_without_collision(selected_index, new_pos.x, mpos.x >= get_view_pos(new_pos).x);
// The index may change if the point is dragged across another one.
int i = curve->set_point_offset(selected_index, new_pos.x);
hovered_index = i;
set_selected_index(i);
new_pos.y = CLAMP(new_pos.y, curve->get_min_value(), curve->get_max_value());
curve->set_point_value(selected_index, new_pos.y);
} else {
// Drag tangent.
const Vector2 new_pos = curve->get_point_position(selected_index);
const Vector2 control_pos = get_world_pos(mpos);
Vector2 dir = (control_pos - new_pos).normalized();
real_t tangent = dir.y / (dir.x > 0 ? MAX(dir.x, 0.00001) : MIN(dir.x, -0.00001));
// Must keep track of the hovered index as the cursor might move outside of the editor while dragging.
hovered_tangent_index = selected_tangent_index;
// Adjust the tangents.
if (selected_tangent_index == TANGENT_LEFT) {
curve->set_point_left_tangent(selected_index, tangent);
// Align the other tangent if it isn't linear and Shift is not pressed.
// If Shift is pressed at any point, restore the initial angle of the other tangent.
if (selected_index != (curve->get_point_count() - 1) && curve->get_point_right_mode(selected_index) != Curve::TANGENT_LINEAR) {
curve->set_point_right_tangent(selected_index, mm->is_shift_pressed() ? initial_grab_right_tangent : tangent);
}
} else {
curve->set_point_right_tangent(selected_index, tangent);
if (selected_index != 0 && curve->get_point_left_mode(selected_index) != Curve::TANGENT_LINEAR) {
curve->set_point_left_tangent(selected_index, mm->is_shift_pressed() ? initial_grab_left_tangent : tangent);
}
}
}
}
} else {
// Grab mode is GRAB_NONE, so do hovering logic.
hovered_index = get_point_at(mpos);
hovered_tangent_index = get_tangent_at(mpos);
queue_redraw();
}
}
}
void CurveEdit::use_preset(int p_preset_id) {
ERR_FAIL_COND(p_preset_id < 0 || p_preset_id >= PRESET_COUNT);
ERR_FAIL_COND(curve.is_null());
Array previous_data = curve->get_data();
curve->clear_points();
const float min_y = curve->get_min_value();
const float max_y = curve->get_max_value();
const float min_x = curve->get_min_domain();
const float max_x = curve->get_max_domain();
switch (p_preset_id) {
case PRESET_CONSTANT:
curve->add_point(Vector2(min_x, (min_y + max_y) / 2.0));
curve->add_point(Vector2(max_x, (min_y + max_y) / 2.0));
curve->set_point_right_mode(0, Curve::TANGENT_LINEAR);
curve->set_point_left_mode(1, Curve::TANGENT_LINEAR);
break;
case PRESET_LINEAR:
curve->add_point(Vector2(min_x, min_y));
curve->add_point(Vector2(max_x, max_y));
curve->set_point_right_mode(0, Curve::TANGENT_LINEAR);
curve->set_point_left_mode(1, Curve::TANGENT_LINEAR);
break;
case PRESET_EASE_IN:
curve->add_point(Vector2(min_x, min_y));
curve->add_point(Vector2(max_x, max_y), curve->get_value_range() / curve->get_domain_range() * 1.4, 0);
break;
case PRESET_EASE_OUT:
curve->add_point(Vector2(min_x, min_y), 0, curve->get_value_range() / curve->get_domain_range() * 1.4);
curve->add_point(Vector2(max_x, max_y));
break;
case PRESET_SMOOTHSTEP:
curve->add_point(Vector2(min_x, min_y));
curve->add_point(Vector2(max_x, max_y));
break;
default:
break;
}
EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
undo_redo->create_action(TTR("Load Curve Preset"));
undo_redo->add_do_method(*curve, "_set_data", curve->get_data());
undo_redo->add_do_method(this, "set_selected_index", -1);
undo_redo->add_undo_method(*curve, "_set_data", previous_data);
undo_redo->add_undo_method(this, "set_selected_index", selected_index);
undo_redo->commit_action();
}
void CurveEdit::_curve_changed() {
queue_redraw();
// Point count can change in case of undo.
if (selected_index >= curve->get_point_count()) {
set_selected_index(-1);
}
}
int CurveEdit::get_point_at(const Vector2 &p_pos) const {
if (curve.is_null()) {
return -1;
}
// Use a square-shaped hover region. If hovering multiple points, pick the closer one.
const Rect2 hover_rect = Rect2(p_pos, Vector2(0, 0)).grow(hover_radius);
int closest_idx = -1;
float closest_dist_squared = hover_radius * hover_radius * 2;
for (int i = 0; i < curve->get_point_count(); ++i) {
Vector2 p = get_view_pos(curve->get_point_position(i));
if (hover_rect.has_point(p) && p.distance_squared_to(p_pos) < closest_dist_squared) {
closest_dist_squared = p.distance_squared_to(p_pos);
closest_idx = i;
}
}
return closest_idx;
}
CurveEdit::TangentIndex CurveEdit::get_tangent_at(const Vector2 &p_pos) const {
if (curve.is_null() || selected_index < 0) {
return TANGENT_NONE;
}
const Rect2 hover_rect = Rect2(p_pos, Vector2(0, 0)).grow(tangent_hover_radius);
if (selected_index != 0) {
Vector2 control_pos = get_tangent_view_pos(selected_index, TANGENT_LEFT);
if (hover_rect.has_point(control_pos)) {
return TANGENT_LEFT;
}
}
if (selected_index != curve->get_point_count() - 1) {
Vector2 control_pos = get_tangent_view_pos(selected_index, TANGENT_RIGHT);
if (hover_rect.has_point(control_pos)) {
return TANGENT_RIGHT;
}
}
return TANGENT_NONE;
}
// FIXME: This function should be bounded better.
float CurveEdit::get_offset_without_collision(int p_current_index, float p_offset, bool p_prioritize_right) {
float safe_offset = p_offset;
bool prioritizing_right = p_prioritize_right;
for (int i = 0; i < curve->get_point_count(); i++) {
if (i == p_current_index) {
continue;
}
if (curve->get_point_position(i).x > safe_offset) {
break;
}
if (curve->get_point_position(i).x == safe_offset) {
if (prioritizing_right) {
safe_offset += 0.00001;
if (safe_offset > 1.0) {
safe_offset = 1.0;
prioritizing_right = false;
}
} else {
safe_offset -= 0.00001;
if (safe_offset < 0.0) {
safe_offset = 0.0;
prioritizing_right = true;
}
}
i = -1;
}
}
return safe_offset;
}
void CurveEdit::add_point(const Vector2 &p_pos) {
ERR_FAIL_COND(curve.is_null());
// Add a point to get its index, then remove it immediately. Trick to feed the UndoRedo.
int new_idx = curve->add_point(p_pos);
curve->remove_point(new_idx);
EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
undo_redo->create_action(TTR("Add Curve Point"));
undo_redo->add_do_method(*curve, "add_point", p_pos);
undo_redo->add_do_method(this, "set_selected_index", new_idx);
undo_redo->add_undo_method(*curve, "remove_point", new_idx);
undo_redo->add_undo_method(this, "set_selected_index", -1);
undo_redo->commit_action();
}
void CurveEdit::remove_point(int p_index) {
ERR_FAIL_COND(curve.is_null());
ERR_FAIL_INDEX_MSG(p_index, curve->get_point_count(), "Curve point is out of bounds.");
Curve::Point p = curve->get_point(p_index);
Vector2 old_pos = (grabbing == GRAB_MOVE) ? initial_grab_pos : p.position;
int new_selected_index = selected_index;
// Reselect the old selected point if it's not the deleted one.
if (new_selected_index > p_index) {
new_selected_index -= 1;
} else if (new_selected_index == p_index) {
new_selected_index = -1;
}
EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
undo_redo->create_action(TTR("Remove Curve Point"));
undo_redo->add_do_method(*curve, "remove_point", p_index);
undo_redo->add_do_method(this, "set_selected_index", new_selected_index);
undo_redo->add_undo_method(*curve, "add_point", old_pos, p.left_tangent, p.right_tangent, p.left_mode, p.right_mode);
undo_redo->add_undo_method(this, "set_selected_index", selected_index);
undo_redo->commit_action();
}
void CurveEdit::set_point_position(int p_index, const Vector2 &p_pos) {
ERR_FAIL_COND(curve.is_null());
ERR_FAIL_INDEX_MSG(p_index, curve->get_point_count(), "Curve point is out of bounds.");
if (initial_grab_pos == p_pos) {
return;
}
// Pretend the point started from its old place.
curve->set_point_value(p_index, initial_grab_pos.y);
curve->set_point_offset(p_index, initial_grab_pos.x);
// Note: Changing the offset may modify the order.
EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
undo_redo->create_action(TTR("Modify Curve Point"));
undo_redo->add_do_method(*curve, "set_point_value", initial_grab_index, p_pos.y);
undo_redo->add_do_method(*curve, "set_point_offset", initial_grab_index, p_pos.x);
undo_redo->add_do_method(this, "set_selected_index", p_index);
undo_redo->add_undo_method(*curve, "set_point_value", p_index, initial_grab_pos.y);
undo_redo->add_undo_method(*curve, "set_point_offset", p_index, initial_grab_pos.x);
undo_redo->add_undo_method(this, "set_selected_index", initial_grab_index);
undo_redo->commit_action();
}
void CurveEdit::set_point_tangents(int p_index, float p_left, float p_right) {
ERR_FAIL_COND(curve.is_null());
ERR_FAIL_INDEX_MSG(p_index, curve->get_point_count(), "Curve point is out of bounds.");
if (initial_grab_left_tangent == p_left) {
set_point_right_tangent(p_index, p_right);
return;
} else if (initial_grab_right_tangent == p_right) {
set_point_left_tangent(p_index, p_left);
return;
}
curve->set_point_left_tangent(p_index, initial_grab_left_tangent);
curve->set_point_right_tangent(p_index, initial_grab_right_tangent);
EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
undo_redo->create_action(TTR("Modify Curve Point's Tangents"));
undo_redo->add_do_method(*curve, "set_point_left_tangent", p_index, p_left);
undo_redo->add_do_method(*curve, "set_point_right_tangent", p_index, p_right);
undo_redo->add_do_method(this, "set_selected_index", p_index);
undo_redo->add_undo_method(*curve, "set_point_left_tangent", p_index, initial_grab_left_tangent);
undo_redo->add_undo_method(*curve, "set_point_right_tangent", p_index, initial_grab_right_tangent);
undo_redo->add_undo_method(this, "set_selected_index", p_index);
undo_redo->commit_action();
}
void CurveEdit::set_point_left_tangent(int p_index, float p_tangent) {
ERR_FAIL_COND(curve.is_null());
ERR_FAIL_INDEX_MSG(p_index, curve->get_point_count(), "Curve point is out of bounds.");
if (initial_grab_left_tangent == p_tangent) {
return;
}
curve->set_point_left_tangent(p_index, initial_grab_left_tangent);
EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
undo_redo->create_action(TTR("Modify Curve Point's Left Tangent"));
undo_redo->add_do_method(*curve, "set_point_left_tangent", p_index, p_tangent);
undo_redo->add_do_method(this, "set_selected_index", p_index);
undo_redo->add_undo_method(*curve, "set_point_left_tangent", p_index, initial_grab_left_tangent);
undo_redo->add_undo_method(this, "set_selected_index", p_index);
undo_redo->commit_action();
}
void CurveEdit::set_point_right_tangent(int p_index, float p_tangent) {
ERR_FAIL_COND(curve.is_null());
ERR_FAIL_INDEX_MSG(p_index, curve->get_point_count(), "Curve point is out of bounds.");
if (initial_grab_right_tangent == p_tangent) {
return;
}
curve->set_point_right_tangent(p_index, initial_grab_right_tangent);
EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
undo_redo->create_action(TTR("Modify Curve Point's Right Tangent"));
undo_redo->add_do_method(*curve, "set_point_right_tangent", p_index, p_tangent);
undo_redo->add_do_method(this, "set_selected_index", p_index);
undo_redo->add_undo_method(*curve, "set_point_right_tangent", p_index, initial_grab_right_tangent);
undo_redo->add_undo_method(this, "set_selected_index", p_index);
undo_redo->commit_action();
}
void CurveEdit::toggle_linear(int p_index, TangentIndex p_tangent) {
ERR_FAIL_COND(curve.is_null());
ERR_FAIL_INDEX_MSG(p_index, curve->get_point_count(), "Curve point is out of bounds.");
if (p_tangent == TANGENT_NONE) {
return;
}
EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
undo_redo->create_action(TTR("Toggle Linear Curve Point's Tangent"));
Curve::TangentMode prev_mode = (p_tangent == TANGENT_LEFT) ? curve->get_point_left_mode(p_index) : curve->get_point_right_mode(p_index);
Curve::TangentMode mode = (prev_mode == Curve::TANGENT_LINEAR) ? Curve::TANGENT_FREE : Curve::TANGENT_LINEAR;
float prev_angle = (p_tangent == TANGENT_LEFT) ? curve->get_point_left_tangent(p_index) : curve->get_point_right_tangent(p_index);
// Add different methods in the UndoRedo based on the tangent passed.
if (p_tangent == TANGENT_LEFT) {
undo_redo->add_do_method(*curve, "set_point_left_mode", p_index, mode);
undo_redo->add_undo_method(*curve, "set_point_left_mode", p_index, prev_mode);
undo_redo->add_undo_method(*curve, "set_point_left_tangent", p_index, prev_angle);
} else {
undo_redo->add_do_method(*curve, "set_point_right_mode", p_index, mode);
undo_redo->add_undo_method(*curve, "set_point_right_mode", p_index, prev_mode);
undo_redo->add_undo_method(*curve, "set_point_right_tangent", p_index, prev_angle);
}
undo_redo->commit_action();
}
void CurveEdit::set_selected_index(int p_index) {
if (p_index != selected_index) {
selected_index = p_index;
queue_redraw();
}
}
void CurveEdit::update_view_transform() {
Ref<Font> font = get_theme_font(SceneStringName(font), SNAME("Label"));
int font_size = get_theme_font_size(SceneStringName(font_size), SNAME("Label"));
const real_t margin = font->get_height(font_size) + 2 * EDSCALE;
float min_x = curve.is_valid() ? curve->get_min_domain() : 0.0;
float max_x = curve.is_valid() ? curve->get_max_domain() : 1.0;
float min_y = curve.is_valid() ? curve->get_min_value() : 0.0;
float max_y = curve.is_valid() ? curve->get_max_value() : 1.0;
const Rect2 world_rect = Rect2(min_x, min_y, max_x - min_x, max_y - min_y);
const Size2 view_margin(margin, margin);
const Size2 view_size = get_size() - view_margin * 2;
const Vector2 scale = view_size / world_rect.size;
Transform2D world_trans;
world_trans.translate_local(-world_rect.position - Vector2(0, world_rect.size.y));
world_trans.scale(Vector2(scale.x, -scale.y));
Transform2D view_trans;
view_trans.translate_local(view_margin);
_world_to_view = view_trans * world_trans;
}
Vector2 CurveEdit::get_tangent_view_pos(int p_index, TangentIndex p_tangent) const {
Vector2 dir;
if (p_tangent == TANGENT_LEFT) {
dir = -Vector2(1, curve->get_point_left_tangent(p_index));
} else {
dir = Vector2(1, curve->get_point_right_tangent(p_index));
}
Vector2 point_pos = curve->get_point_position(p_index);
Vector2 point_view_pos = get_view_pos(point_pos);
Vector2 control_view_pos = get_view_pos(point_pos + dir);
Vector2 distance_from_point = tangent_length * (control_view_pos - point_view_pos).normalized();
Vector2 tangent_view_pos = point_view_pos + distance_from_point;
// Since the tangent is long, it might slip outside of the area of the editor for points close to the domain/range boundaries.
// The code below shrinks the tangent control by up to 50% so it always stays inside the editor for points within the bounds.
float fraction_inside = 1.0;
if (distance_from_point.x != 0.0) {
fraction_inside = MIN(fraction_inside, ((distance_from_point.x > 0 ? get_rect().size.x : 0) - point_view_pos.x) / distance_from_point.x);
}
if (distance_from_point.y != 0.0) {
fraction_inside = MIN(fraction_inside, ((distance_from_point.y > 0 ? get_rect().size.y : 0) - point_view_pos.y) / distance_from_point.y);
}
if (fraction_inside < 1.0 && fraction_inside > 0.5) {
tangent_view_pos = point_view_pos + distance_from_point * fraction_inside;
}
return tangent_view_pos;
}
Vector2 CurveEdit::get_view_pos(const Vector2 &p_world_pos) const {
return _world_to_view.xform(p_world_pos);
}
Vector2 CurveEdit::get_world_pos(const Vector2 &p_view_pos) const {
return _world_to_view.affine_inverse().xform(p_view_pos);
}
// Uses non-baked points, but takes advantage of ordered iteration to be faster.
void CurveEdit::plot_curve_accurate(float p_step, const Color &p_line_color, const Color &p_edge_line_color) {
const real_t min_x = curve->get_min_domain();
const real_t max_x = curve->get_max_domain();
if (curve->get_point_count() <= 1) { // Draw single line through entire plot.
real_t y = curve->sample(0);
draw_line(get_view_pos(Vector2(min_x, y)) + Vector2(0.5, 0), get_view_pos(Vector2(max_x, y)) - Vector2(1.5, 0), p_line_color, LINE_WIDTH, true);
return;
}
Vector2 first_point = curve->get_point_position(0);
Vector2 last_point = curve->get_point_position(curve->get_point_count() - 1);
// Transform pixels-per-step into curve domain. Only works for non-rotated transforms.
const float world_step_size = p_step / _world_to_view.get_scale().x;
// Edge lines.
draw_line(get_view_pos(Vector2(min_x, first_point.y)) + Vector2(0.5, 0), get_view_pos(first_point), p_edge_line_color, LINE_WIDTH, true);
draw_line(get_view_pos(last_point), get_view_pos(Vector2(max_x, last_point.y)) - Vector2(1.5, 0), p_edge_line_color, LINE_WIDTH, true);
// Draw section by section, so that we get maximum precision near points.
// It's an accurate representation, but slower than using the baked one.
for (int i = 1; i < curve->get_point_count(); ++i) {
Vector2 a = curve->get_point_position(i - 1);
Vector2 b = curve->get_point_position(i);
Vector2 pos = a;
Vector2 prev_pos = a;
float samples = (b.x - a.x) / world_step_size;
for (int j = 1; j < samples; j++) {
float x = j * world_step_size;
pos.x = a.x + x;
pos.y = curve->sample_local_nocheck(i - 1, x);
draw_line(get_view_pos(prev_pos), get_view_pos(pos), p_line_color, LINE_WIDTH, true);
prev_pos = pos;
}
draw_line(get_view_pos(prev_pos), get_view_pos(b), p_line_color, LINE_WIDTH, true);
}
}
void CurveEdit::_redraw() {
if (curve.is_null()) {
return;
}
update_view_transform();
// Draw background.
Vector2 view_size = get_rect().size;
draw_style_box(get_theme_stylebox(SceneStringName(panel), SNAME("Tree")), Rect2(Point2(), view_size));
// Draw primary grid.
draw_set_transform_matrix(_world_to_view);
Vector2 min_edge = get_world_pos(Vector2(0, view_size.y));
Vector2 max_edge = get_world_pos(Vector2(view_size.x, 0));
const Color grid_color_primary = get_theme_color(SNAME("mono_color"), EditorStringName(Editor)) * Color(1, 1, 1, 0.25);
const Color grid_color = get_theme_color(SNAME("mono_color"), EditorStringName(Editor)) * Color(1, 1, 1, 0.1);
const Vector2i grid_steps = Vector2i(4, 2);
const Vector2 step_size = Vector2(curve->get_domain_range(), curve->get_value_range()) / grid_steps;
draw_line(Vector2(min_edge.x, curve->get_min_value()), Vector2(max_edge.x, curve->get_min_value()), grid_color_primary);
draw_line(Vector2(max_edge.x, curve->get_max_value()), Vector2(min_edge.x, curve->get_max_value()), grid_color_primary);
draw_line(Vector2(curve->get_min_domain(), min_edge.y), Vector2(curve->get_min_domain(), max_edge.y), grid_color_primary);
draw_line(Vector2(curve->get_max_domain(), max_edge.y), Vector2(curve->get_max_domain(), min_edge.y), grid_color_primary);
for (int i = 1; i < grid_steps.x; i++) {
real_t x = curve->get_min_domain() + i * step_size.x;
draw_line(Vector2(x, min_edge.y), Vector2(x, max_edge.y), grid_color);
}
for (int i = 1; i < grid_steps.y; i++) {
real_t y = curve->get_min_value() + i * step_size.y;
draw_line(Vector2(min_edge.x, y), Vector2(max_edge.x, y), grid_color);
}
// Draw number markings.
draw_set_transform_matrix(Transform2D());
Ref<Font> font = get_theme_font(SceneStringName(font), SNAME("Label"));
int font_size = get_theme_font_size(SceneStringName(font_size), SNAME("Label"));
float font_height = font->get_height(font_size);
Color text_color = get_theme_color(SceneStringName(font_color), EditorStringName(Editor));
int pad = Math::round(2 * EDSCALE);
for (int i = 0; i <= grid_steps.x; ++i) {
real_t x = curve->get_min_domain() + i * step_size.x;
draw_string(font, get_view_pos(Vector2(x, curve->get_min_value())) + Vector2(pad, font_height - pad), String::num(x, 2), HORIZONTAL_ALIGNMENT_CENTER, -1, font_size, text_color);
}
for (int i = 0; i <= grid_steps.y; ++i) {
real_t y = curve->get_min_value() + i * step_size.y;
draw_string(font, get_view_pos(Vector2(curve->get_min_domain(), y)) + Vector2(pad, -pad), String::num(y, 2), HORIZONTAL_ALIGNMENT_LEFT, -1, font_size, text_color);
}
// Draw curve in view coordinates. Curve world-to-view point conversion happens in plot_curve_accurate().
const Color line_color = get_theme_color(SceneStringName(font_color), EditorStringName(Editor));
const Color edge_line_color = get_theme_color(SceneStringName(font_color), EditorStringName(Editor)) * Color(1, 1, 1, 0.75);
plot_curve_accurate(STEP_SIZE, line_color, edge_line_color);
// Draw points, except for the selected one.
bool shift_pressed = Input::get_singleton()->is_key_pressed(Key::SHIFT);
const Color point_color = get_theme_color(SceneStringName(font_color), EditorStringName(Editor));
for (int i = 0; i < curve->get_point_count(); ++i) {
Vector2 pos = get_view_pos(curve->get_point_position(i));
if (selected_index != i) {
draw_rect(Rect2(pos, Vector2(0, 0)).grow(point_radius), point_color);
}
if (hovered_index == i && hovered_tangent_index == TANGENT_NONE) {
draw_rect(Rect2(pos, Vector2(0, 0)).grow(hover_radius - Math::round(3 * EDSCALE)), line_color, false, Math::round(1 * EDSCALE));
}
}
// Draw selected point and its tangents.
if (selected_index >= 0) {
const Vector2 point_pos = curve->get_point_position(selected_index);
const Color selected_point_color = get_theme_color(SNAME("accent_color"), EditorStringName(Editor));
// Draw tangents if not dragging a point, or if holding a point without having moved it yet.
if (grabbing == GRAB_NONE || initial_grab_pos == point_pos || selected_tangent_index != TANGENT_NONE) {
const Color selected_tangent_color = get_theme_color(SNAME("accent_color"), EditorStringName(Editor)).darkened(0.25);
const Color tangent_color = get_theme_color(SceneStringName(font_color), EditorStringName(Editor)).darkened(0.25);
if (selected_index != 0) {
Vector2 control_pos = get_tangent_view_pos(selected_index, TANGENT_LEFT);
Color left_tangent_color = (selected_tangent_index == TANGENT_LEFT) ? selected_tangent_color : tangent_color;
draw_line(get_view_pos(point_pos), control_pos, left_tangent_color, 0.5 * EDSCALE, true);
// Square for linear mode, circle otherwise.
if (curve->get_point_left_mode(selected_index) == Curve::TANGENT_FREE) {
draw_circle(control_pos, tangent_radius, left_tangent_color);
} else {
draw_rect(Rect2(control_pos, Vector2(0, 0)).grow(tangent_radius), left_tangent_color);
}
// Hover indicator.
if (hovered_tangent_index == TANGENT_LEFT || (hovered_tangent_index == TANGENT_RIGHT && !shift_pressed && curve->get_point_left_mode(selected_index) != Curve::TANGENT_LINEAR)) {
draw_rect(Rect2(control_pos, Vector2(0, 0)).grow(tangent_hover_radius - Math::round(3 * EDSCALE)), tangent_color, false, Math::round(1 * EDSCALE));
}
}
if (selected_index != curve->get_point_count() - 1) {
Vector2 control_pos = get_tangent_view_pos(selected_index, TANGENT_RIGHT);
Color right_tangent_color = (selected_tangent_index == TANGENT_RIGHT) ? selected_tangent_color : tangent_color;
draw_line(get_view_pos(point_pos), control_pos, right_tangent_color, 0.5 * EDSCALE, true);
// Square for linear mode, circle otherwise.
if (curve->get_point_right_mode(selected_index) == Curve::TANGENT_FREE) {
draw_circle(control_pos, tangent_radius, right_tangent_color);
} else {
draw_rect(Rect2(control_pos, Vector2(0, 0)).grow(tangent_radius), right_tangent_color);
}
// Hover indicator.
if (hovered_tangent_index == TANGENT_RIGHT || (hovered_tangent_index == TANGENT_LEFT && !shift_pressed && curve->get_point_right_mode(selected_index) != Curve::TANGENT_LINEAR)) {
draw_rect(Rect2(control_pos, Vector2(0, 0)).grow(tangent_hover_radius - Math::round(3 * EDSCALE)), tangent_color, false, Math::round(1 * EDSCALE));
}
}
}
draw_rect(Rect2(get_view_pos(point_pos), Vector2(0, 0)).grow(point_radius), selected_point_color);
}
// Draw help text.
if (selected_index > 0 && selected_index < curve->get_point_count() - 1 && selected_tangent_index == TANGENT_NONE && hovered_tangent_index != TANGENT_NONE && !shift_pressed) {
float width = view_size.x - 50 * EDSCALE;
text_color.a *= 0.4;
draw_multiline_string(font, Vector2(25 * EDSCALE, font_height - Math::round(2 * EDSCALE)), TTR("Hold Shift to edit tangents individually"), HORIZONTAL_ALIGNMENT_CENTER, width, font_size, -1, text_color);
} else if (selected_index != -1 && selected_tangent_index == TANGENT_NONE) {
const Vector2 point_pos = curve->get_point_position(selected_index);
float width = view_size.x - 50 * EDSCALE;
text_color.a *= 0.8;
draw_string(font, Vector2(25 * EDSCALE, font_height - Math::round(2 * EDSCALE)), vformat("(%.2f, %.2f)", point_pos.x, point_pos.y), HORIZONTAL_ALIGNMENT_CENTER, width, font_size, text_color);
} else if (selected_index != -1 && selected_tangent_index != TANGENT_NONE) {
float width = view_size.x - 50 * EDSCALE;
text_color.a *= 0.8;
real_t theta = Math::rad_to_deg(Math::atan(selected_tangent_index == TANGENT_LEFT ? -1 * curve->get_point_left_tangent(selected_index) : curve->get_point_right_tangent(selected_index)));
draw_string(font, Vector2(25 * EDSCALE, font_height - Math::round(2 * EDSCALE)), String::num(theta, 1) + String::utf8(" °"), HORIZONTAL_ALIGNMENT_CENTER, width, font_size, text_color);
}
// Draw temporary constraints and snapping axes.
draw_set_transform_matrix(_world_to_view);
if (Input::get_singleton()->is_key_pressed(Key::ALT) && grabbing != GRAB_NONE && selected_tangent_index == TANGENT_NONE) {
float prev_point_offset = (selected_index > 0) ? curve->get_point_position(selected_index - 1).x : curve->get_min_domain();
float next_point_offset = (selected_index < curve->get_point_count() - 1) ? curve->get_point_position(selected_index + 1).x : curve->get_max_domain();
draw_line(Vector2(prev_point_offset, curve->get_min_value()), Vector2(prev_point_offset, curve->get_max_value()), Color(point_color, 0.6));
draw_line(Vector2(next_point_offset, curve->get_min_value()), Vector2(next_point_offset, curve->get_max_value()), Color(point_color, 0.6));
}
if (shift_pressed && grabbing != GRAB_NONE && selected_tangent_index == TANGENT_NONE) {
draw_line(Vector2(initial_grab_pos.x, curve->get_min_value()), Vector2(initial_grab_pos.x, curve->get_max_value()), get_theme_color(SNAME("axis_x_color"), EditorStringName(Editor)).darkened(0.4));
draw_line(Vector2(curve->get_min_domain(), initial_grab_pos.y), Vector2(curve->get_max_domain(), initial_grab_pos.y), get_theme_color(SNAME("axis_y_color"), EditorStringName(Editor)).darkened(0.4));
}
}
///////////////////////
const int CurveEditor::DEFAULT_SNAP = 10;
void CurveEditor::_set_snap_enabled(bool p_enabled) {
curve_editor_rect->set_snap_enabled(p_enabled);
snap_count_edit->set_visible(p_enabled);
}
void CurveEditor::_set_snap_count(int p_snap_count) {
curve_editor_rect->set_snap_count(CLAMP(p_snap_count, 2, 100));
}
void CurveEditor::_on_preset_item_selected(int p_preset_id) {
curve_editor_rect->use_preset(p_preset_id);
}
void CurveEditor::set_curve(const Ref<Curve> &p_curve) {
curve_editor_rect->set_curve(p_curve);
}
void CurveEditor::_notification(int p_what) {
switch (p_what) {
case NOTIFICATION_THEME_CHANGED: {
spacing = Math::round(BASE_SPACING * get_theme_default_base_scale());
snap_button->set_button_icon(get_editor_theme_icon(SNAME("SnapGrid")));
PopupMenu *p = presets_button->get_popup();
p->clear();
p->add_icon_item(get_editor_theme_icon(SNAME("CurveConstant")), TTR("Constant"), CurveEdit::PRESET_CONSTANT);
p->add_icon_item(get_editor_theme_icon(SNAME("CurveLinear")), TTR("Linear"), CurveEdit::PRESET_LINEAR);
p->add_icon_item(get_editor_theme_icon(SNAME("CurveIn")), TTR("Ease In"), CurveEdit::PRESET_EASE_IN);
p->add_icon_item(get_editor_theme_icon(SNAME("CurveOut")), TTR("Ease Out"), CurveEdit::PRESET_EASE_OUT);
p->add_icon_item(get_editor_theme_icon(SNAME("CurveInOut")), TTR("Smoothstep"), CurveEdit::PRESET_SMOOTHSTEP);
} break;
case NOTIFICATION_READY: {
Ref<Curve> curve = curve_editor_rect->get_curve();
if (curve.is_valid()) {
// Set snapping settings based on the curve's meta.
snap_button->set_pressed(curve->get_meta("_snap_enabled", false));
snap_count_edit->set_value(curve->get_meta("_snap_count", DEFAULT_SNAP));
}
} break;
case NOTIFICATION_RESIZED:
curve_editor_rect->update_minimum_size();
break;
}
}
CurveEditor::CurveEditor() {
HFlowContainer *toolbar = memnew(HFlowContainer);
add_child(toolbar);
snap_button = memnew(Button);
snap_button->set_tooltip_text(TTR("Toggle Grid Snap"));
snap_button->set_toggle_mode(true);
toolbar->add_child(snap_button);
snap_button->connect(SceneStringName(toggled), callable_mp(this, &CurveEditor::_set_snap_enabled));
toolbar->add_child(memnew(VSeparator));
snap_count_edit = memnew(EditorSpinSlider);
snap_count_edit->set_min(2);
snap_count_edit->set_max(100);