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godot/editor/plugins/curve_editor_plugin.cpp

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/*************************************************************************/
/* curve_editor_plugin.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 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 "curve_editor_plugin.h"
#include "canvas_item_editor_plugin.h"
#include "core_string_names.h"
#include "os/input.h"
#include "os/keyboard.h"
CurveEditor::CurveEditor() {
_selected_point = -1;
_hover_point = -1;
_selected_tangent = TANGENT_NONE;
_hover_radius = 6;
_tangents_length = 40;
_dragging = false;
_has_undo_data = false;
set_focus_mode(FOCUS_ALL);
set_clip_contents(true);
_context_menu = memnew(PopupMenu);
_context_menu->connect("id_pressed", this, "_on_context_menu_item_selected");
add_child(_context_menu);
_presets_menu = memnew(PopupMenu);
_presets_menu->set_name("_presets_menu");
_presets_menu->add_item(TTR("Flat0"), PRESET_FLAT0);
_presets_menu->add_item(TTR("Flat1"), PRESET_FLAT1);
_presets_menu->add_item(TTR("Linear"), PRESET_LINEAR);
_presets_menu->add_item(TTR("Ease in"), PRESET_EASE_IN);
_presets_menu->add_item(TTR("Ease out"), PRESET_EASE_OUT);
_presets_menu->add_item(TTR("Smoothstep"), PRESET_SMOOTHSTEP);
_presets_menu->connect("id_pressed", this, "_on_preset_item_selected");
_context_menu->add_child(_presets_menu);
}
void CurveEditor::set_curve(Ref<Curve> curve) {
if (curve == _curve_ref)
return;
if (_curve_ref.is_valid()) {
_curve_ref->disconnect(CoreStringNames::get_singleton()->changed, this, "_curve_changed");
_curve_ref->disconnect(Curve::SIGNAL_RANGE_CHANGED, this, "_curve_changed");
}
_curve_ref = curve;
if (_curve_ref.is_valid()) {
_curve_ref->connect(CoreStringNames::get_singleton()->changed, this, "_curve_changed");
_curve_ref->connect(Curve::SIGNAL_RANGE_CHANGED, this, "_curve_changed");
}
_selected_point = -1;
_hover_point = -1;
_selected_tangent = TANGENT_NONE;
update();
// 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
}
Size2 CurveEditor::get_minimum_size() const {
return Vector2(64, 64);
}
void CurveEditor::_notification(int p_what) {
if (p_what == NOTIFICATION_DRAW)
_draw();
}
void CurveEditor::on_gui_input(const Ref<InputEvent> &p_event) {
Ref<InputEventMouseButton> mb_ref = p_event;
if (mb_ref.is_valid()) {
const InputEventMouseButton &mb = **mb_ref;
if (mb.is_pressed() && !_dragging) {
Vector2 mpos = mb.get_position();
_selected_tangent = get_tangent_at(mpos);
if (_selected_tangent == TANGENT_NONE)
set_selected_point(get_point_at(mpos));
switch (mb.get_button_index()) {
case BUTTON_RIGHT:
_context_click_pos = mpos;
open_context_menu(get_global_transform().xform(mpos));
break;
case BUTTON_MIDDLE:
remove_point(_hover_point);
break;
case BUTTON_LEFT:
_dragging = true;
break;
}
}
if (!mb.is_pressed() && _dragging && mb.get_button_index() == BUTTON_LEFT) {
_dragging = false;
if (_has_undo_data) {
UndoRedo &ur = *EditorNode::get_singleton()->get_undo_redo();
ur.create_action(_selected_tangent == TANGENT_NONE ? TTR("Modify Curve Point") : TTR("Modify Curve Tangent"));
ur.add_do_method(*_curve_ref, "_set_data", _curve_ref->get_data());
ur.add_undo_method(*_curve_ref, "_set_data", _undo_data);
// Note: this will trigger one more "changed" signal even if nothing changes,
// but it's ok since it would have fired every frame during the drag anyways
ur.commit_action();
_has_undo_data = false;
}
}
}
Ref<InputEventMouseMotion> mm_ref = p_event;
if (mm_ref.is_valid()) {
const InputEventMouseMotion &mm = **mm_ref;
Vector2 mpos = mm.get_position();
if (_dragging && _curve_ref.is_valid()) {
Curve &curve = **_curve_ref;
if (_selected_point != -1) {
if (!_has_undo_data) {
// Save full curve state before dragging points,
// because this operation can modify their order
_undo_data = curve.get_data();
_has_undo_data = true;
}
if (_selected_tangent == TANGENT_NONE) {
// Drag point
Vector2 point_pos = get_world_pos(mpos);
int i = curve.set_point_offset(_selected_point, point_pos.x);
// The index may change if the point is dragged across another one
set_hover_point_index(i);
set_selected_point(i);
// This is to prevent the user from loosing a point out of view.
if (point_pos.y < curve.get_min_value())
point_pos.y = curve.get_min_value();
else if (point_pos.y > curve.get_max_value())
point_pos.y = curve.get_max_value();
curve.set_point_value(_selected_point, point_pos.y);
} else {
// Drag tangent
Vector2 point_pos = curve.get_point_position(_selected_point);
Vector2 control_pos = get_world_pos(mpos);
Vector2 dir = (control_pos - point_pos).normalized();
real_t tangent;
if (Math::abs(dir.x) > CMP_EPSILON)
tangent = dir.y / dir.x;
else
tangent = 9999 * (dir.y >= 0 ? 1 : -1);
bool link = !Input::get_singleton()->is_key_pressed(KEY_SHIFT);
if (_selected_tangent == TANGENT_LEFT) {
curve.set_point_left_tangent(_selected_point, tangent);
// Note: if a tangent is set to linear, it shouldn't be linked to the other
if (link && _selected_point != curve.get_point_count() - 1 && !curve.get_point_right_mode(_selected_point) != Curve::TANGENT_FREE)
curve.set_point_right_tangent(_selected_point, tangent);
} else {
curve.set_point_right_tangent(_selected_point, tangent);
if (link && _selected_point != 0 && !curve.get_point_left_mode(_selected_point) != Curve::TANGENT_FREE)
curve.set_point_left_tangent(_selected_point, tangent);
}
}
}
} else {
set_hover_point_index(get_point_at(mpos));
}
}
Ref<InputEventKey> key_ref = p_event;
if (key_ref.is_valid()) {
const InputEventKey &key = **key_ref;
if (key.is_pressed() && _selected_point != -1) {
if (key.get_scancode() == KEY_DELETE)
remove_point(_selected_point);
}
}
}
void CurveEditor::on_preset_item_selected(int preset_id) {
ERR_FAIL_COND(preset_id < 0 || preset_id >= PRESET_COUNT);
ERR_FAIL_COND(_curve_ref.is_null());
Curve &curve = **_curve_ref;
Array previous_data = curve.get_data();
curve.clear_points();
switch (preset_id) {
case PRESET_FLAT0:
curve.add_point(Vector2(0, 0));
curve.add_point(Vector2(1, 0));
curve.set_point_right_mode(0, Curve::TANGENT_LINEAR);
curve.set_point_left_mode(1, Curve::TANGENT_LINEAR);
break;
case PRESET_FLAT1:
curve.add_point(Vector2(0, 1));
curve.add_point(Vector2(1, 1));
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(0, 0));
curve.add_point(Vector2(1, 1));
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(0, 0));
curve.add_point(Vector2(1, 1), (curve.get_max_value() - curve.get_min_value()) * 1.4, 0);
break;
case PRESET_EASE_OUT:
curve.add_point(Vector2(0, 0), 0, (curve.get_max_value() - curve.get_min_value()) * 1.4);
curve.add_point(Vector2(1, 1));
break;
case PRESET_SMOOTHSTEP:
curve.add_point(Vector2(0, 0));
curve.add_point(Vector2(1, 1));
break;
default:
break;
}
UndoRedo &ur = *EditorNode::get_singleton()->get_undo_redo();
ur.create_action(TTR("Load Curve Preset"));
ur.add_do_method(&curve, "_set_data", curve.get_data());
ur.add_undo_method(&curve, "_set_data", previous_data);
ur.commit_action();
}
void CurveEditor::_curve_changed() {
update();
// Point count can change in case of undo
if (_selected_point >= _curve_ref->get_point_count()) {
set_selected_point(-1);
}
}
void CurveEditor::on_context_menu_item_selected(int action_id) {
switch (action_id) {
case CONTEXT_ADD_POINT:
add_point(_context_click_pos);
break;
case CONTEXT_REMOVE_POINT:
remove_point(_selected_point);
break;
case CONTEXT_LINEAR:
toggle_linear();
break;
case CONTEXT_LEFT_LINEAR:
toggle_linear(TANGENT_LEFT);
break;
case CONTEXT_RIGHT_LINEAR:
toggle_linear(TANGENT_RIGHT);
break;
}
}
void CurveEditor::open_context_menu(Vector2 pos) {
_context_menu->set_position(pos);
_context_menu->clear();
if (_curve_ref.is_valid()) {
_context_menu->add_item(TTR("Add point"), CONTEXT_ADD_POINT);
if (_selected_point >= 0) {
_context_menu->add_item(TTR("Remove point"), CONTEXT_REMOVE_POINT);
if (_selected_tangent != TANGENT_NONE) {
_context_menu->add_separator();
_context_menu->add_check_item(TTR("Linear"), CONTEXT_LINEAR);
bool is_linear = _selected_tangent == TANGENT_LEFT ?
_curve_ref->get_point_left_mode(_selected_point) == Curve::TANGENT_LINEAR :
_curve_ref->get_point_right_mode(_selected_point) == Curve::TANGENT_LINEAR;
_context_menu->set_item_checked(_context_menu->get_item_index(CONTEXT_LINEAR), is_linear);
} else {
if (_selected_point > 0 || _selected_point + 1 < _curve_ref->get_point_count())
_context_menu->add_separator();
if (_selected_point > 0) {
_context_menu->add_check_item(TTR("Left linear"), CONTEXT_LEFT_LINEAR);
_context_menu->set_item_checked(_context_menu->get_item_index(CONTEXT_LEFT_LINEAR),
_curve_ref->get_point_left_mode(_selected_point) == Curve::TANGENT_LINEAR);
}
if (_selected_point + 1 < _curve_ref->get_point_count()) {
_context_menu->add_check_item(TTR("Right linear"), CONTEXT_RIGHT_LINEAR);
_context_menu->set_item_checked(_context_menu->get_item_index(CONTEXT_RIGHT_LINEAR),
_curve_ref->get_point_right_mode(_selected_point) == Curve::TANGENT_LINEAR);
}
}
}
_context_menu->add_separator();
}
_context_menu->add_submenu_item(TTR("Load preset"), _presets_menu->get_name());
_context_menu->set_size(Size2(0, 0));
_context_menu->popup();
}
int CurveEditor::get_point_at(Vector2 pos) const {
if (_curve_ref.is_null())
return -1;
const Curve &curve = **_curve_ref;
const float r = _hover_radius * _hover_radius;
for (int i = 0; i < curve.get_point_count(); ++i) {
Vector2 p = get_view_pos(curve.get_point_position(i));
if (p.distance_squared_to(pos) <= r) {
return i;
}
}
return -1;
}
CurveEditor::TangentIndex CurveEditor::get_tangent_at(Vector2 pos) const {
if (_curve_ref.is_null() || _selected_point < 0)
return TANGENT_NONE;
if (_selected_point != 0) {
Vector2 control_pos = get_tangent_view_pos(_selected_point, TANGENT_LEFT);
if (control_pos.distance_to(pos) < _hover_radius) {
return TANGENT_LEFT;
}
}
if (_selected_point != _curve_ref->get_point_count() - 1) {
Vector2 control_pos = get_tangent_view_pos(_selected_point, TANGENT_RIGHT);
if (control_pos.distance_to(pos) < _hover_radius) {
return TANGENT_RIGHT;
}
}
return TANGENT_NONE;
}
void CurveEditor::add_point(Vector2 pos) {
ERR_FAIL_COND(_curve_ref.is_null());
UndoRedo &ur = *EditorNode::get_singleton()->get_undo_redo();
ur.create_action(TTR("Remove Curve Point"));
Vector2 point_pos = get_world_pos(pos);
if (point_pos.y < 0.0)
point_pos.y = 0.0;
else if (point_pos.y > 1.0)
point_pos.y = 1.0;
// Small trick to get the point index to feed the undo method
int i = _curve_ref->add_point(point_pos);
_curve_ref->remove_point(i);
ur.add_do_method(*_curve_ref, "add_point", point_pos);
ur.add_undo_method(*_curve_ref, "remove_point", i);
ur.commit_action();
}
void CurveEditor::remove_point(int index) {
ERR_FAIL_COND(_curve_ref.is_null());
UndoRedo &ur = *EditorNode::get_singleton()->get_undo_redo();
ur.create_action(TTR("Remove Curve Point"));
Curve::Point p = _curve_ref->get_point(index);
ur.add_do_method(*_curve_ref, "remove_point", index);
ur.add_undo_method(*_curve_ref, "add_point", p.pos, p.left_tangent, p.right_tangent, p.left_mode, p.right_mode);
if (index == _selected_point)
set_selected_point(-1);
ur.commit_action();
}
void CurveEditor::toggle_linear(TangentIndex tangent) {
ERR_FAIL_COND(_curve_ref.is_null());
UndoRedo &ur = *EditorNode::get_singleton()->get_undo_redo();
ur.create_action(TTR("Toggle Curve Linear Tangent"));
if (tangent == TANGENT_NONE)
tangent = _selected_tangent;
if (tangent == TANGENT_LEFT) {
bool is_linear = _curve_ref->get_point_left_mode(_selected_point) == Curve::TANGENT_LINEAR;
Curve::TangentMode prev_mode = _curve_ref->get_point_left_mode(_selected_point);
Curve::TangentMode mode = is_linear ? Curve::TANGENT_FREE : Curve::TANGENT_LINEAR;
ur.add_do_method(*_curve_ref, "set_point_left_mode", _selected_point, mode);
ur.add_undo_method(*_curve_ref, "set_point_left_mode", _selected_point, prev_mode);
} else {
bool is_linear = _curve_ref->get_point_right_mode(_selected_point) == Curve::TANGENT_LINEAR;
Curve::TangentMode prev_mode = _curve_ref->get_point_right_mode(_selected_point);
Curve::TangentMode mode = is_linear ? Curve::TANGENT_FREE : Curve::TANGENT_LINEAR;
ur.add_do_method(*_curve_ref, "set_point_right_mode", _selected_point, mode);
ur.add_undo_method(*_curve_ref, "set_point_right_mode", _selected_point, prev_mode);
}
ur.commit_action();
}
void CurveEditor::set_selected_point(int index) {
if (index != _selected_point) {
_selected_point = index;
update();
}
}
void CurveEditor::set_hover_point_index(int index) {
if (index != _hover_point) {
_hover_point = index;
update();
}
}
void CurveEditor::update_view_transform() {
Vector2 control_size = get_size();
const real_t margin = 24;
float min_y = 0;
float max_y = 1;
if (_curve_ref.is_valid()) {
min_y = _curve_ref->get_min_value();
max_y = _curve_ref->get_max_value();
}
Rect2 world_rect = Rect2(Curve::MIN_X, min_y, Curve::MAX_X, max_y - min_y);
Vector2 wm = Vector2(margin, margin) / control_size;
wm.y *= (max_y - min_y);
world_rect.position -= wm;
world_rect.size += 2.0 * wm;
_world_to_view = Transform2D();
_world_to_view.translate(-world_rect.position - Vector2(0, world_rect.size.y));
_world_to_view.scale(Vector2(control_size.x, -control_size.y) / world_rect.size);
}
Vector2 CurveEditor::get_tangent_view_pos(int i, TangentIndex tangent) const {
Vector2 dir;
if (tangent == TANGENT_LEFT)
dir = -Vector2(1, _curve_ref->get_point_left_tangent(i));
else
dir = Vector2(1, _curve_ref->get_point_right_tangent(i));
Vector2 point_pos = get_view_pos(_curve_ref->get_point_position(i));
Vector2 control_pos = get_view_pos(_curve_ref->get_point_position(i) + dir);
return point_pos + _tangents_length * (control_pos - point_pos).normalized();
}
Vector2 CurveEditor::get_view_pos(Vector2 world_pos) const {
return _world_to_view.xform(world_pos);
}
Vector2 CurveEditor::get_world_pos(Vector2 view_pos) const {
return _world_to_view.affine_inverse().xform(view_pos);
}
// Uses non-baked points, but takes advantage of ordered iteration to be faster
template <typename T>
static void plot_curve_accurate(const Curve &curve, float step, T plot_func) {
if (curve.get_point_count() <= 1) {
// Not enough points to make a curve, so it's just a straight line
float y = curve.interpolate(0);
plot_func(Vector2(0, y), Vector2(1.f, y), true);
} else {
Vector2 first_point = curve.get_point_position(0);
Vector2 last_point = curve.get_point_position(curve.get_point_count() - 1);
// Edge lines
plot_func(Vector2(0, first_point.y), first_point, false);
plot_func(Vector2(Curve::MAX_X, last_point.y), last_point, false);
// 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 len = b.x - a.x;
for (float x = step; x < len; x += step) {
pos.x = a.x + x;
pos.y = curve.interpolate_local_nocheck(i - 1, x);
plot_func(prev_pos, pos, true);
prev_pos = pos;
}
plot_func(prev_pos, b, true);
}
}
}
struct CanvasItemPlotCurve {
CanvasItem &ci;
Color color1;
Color color2;
CanvasItemPlotCurve(CanvasItem &p_ci, Color p_color1, Color p_color2) :
ci(p_ci),
color1(p_color1),
color2(p_color2) {}
void operator()(Vector2 pos0, Vector2 pos1, bool in_definition) {
ci.draw_line(pos0, pos1, in_definition ? color1 : color2);
}
};
void CurveEditor::_draw() {
if (_curve_ref.is_null())
return;
Curve &curve = **_curve_ref;
update_view_transform();
// Background
Vector2 view_size = get_rect().size;
draw_style_box(get_stylebox("bg", "Tree"), Rect2(Point2(), view_size));
// 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_color0 = get_color("grid_major_color", "Editor");
const Color grid_color1 = get_color("grid_minor_color", "Editor");
draw_line(Vector2(min_edge.x, curve.get_min_value()), Vector2(max_edge.x, curve.get_min_value()), grid_color0);
draw_line(Vector2(max_edge.x, curve.get_max_value()), Vector2(min_edge.x, curve.get_max_value()), grid_color0);
draw_line(Vector2(0, min_edge.y), Vector2(0, max_edge.y), grid_color0);
draw_line(Vector2(1, max_edge.y), Vector2(1, min_edge.y), grid_color0);
float curve_height = (curve.get_max_value() - curve.get_min_value());
const Vector2 grid_step(0.25, 0.5 * curve_height);
for (real_t x = 0; x < 1.0; x += grid_step.x) {
draw_line(Vector2(x, min_edge.y), Vector2(x, max_edge.y), grid_color1);
}
for (real_t y = curve.get_min_value(); y < curve.get_max_value(); y += grid_step.y) {
draw_line(Vector2(min_edge.x, y), Vector2(max_edge.x, y), grid_color1);
}
// Markings
draw_set_transform_matrix(Transform2D());
Ref<Font> font = get_font("font", "Label");
float font_height = font->get_height();
const Color text_color = get_color("font_color", "Editor");
{
// X axis
float y = curve.get_min_value();
Vector2 off(0, font_height - 1);
draw_string(font, get_view_pos(Vector2(0, y)) + off, "0.0", text_color);
draw_string(font, get_view_pos(Vector2(0.25, y)) + off, "0.25", text_color);
draw_string(font, get_view_pos(Vector2(0.5, y)) + off, "0.5", text_color);
draw_string(font, get_view_pos(Vector2(0.75, y)) + off, "0.75", text_color);
draw_string(font, get_view_pos(Vector2(1, y)) + off, "1.0", text_color);
}
{
// Y axis
float m0 = curve.get_min_value();
float m1 = 0.5 * (curve.get_min_value() + curve.get_max_value());
float m2 = curve.get_max_value();
Vector2 off(1, -1);
draw_string(font, get_view_pos(Vector2(0, m0)) + off, String::num(m0, 2), text_color);
draw_string(font, get_view_pos(Vector2(0, m1)) + off, String::num(m1, 2), text_color);
draw_string(font, get_view_pos(Vector2(0, m2)) + off, String::num(m2, 3), text_color);
}
// Draw tangents for current point
if (_selected_point >= 0) {
const Color tangent_color = get_color("accent_color", "Editor");
int i = _selected_point;
Vector2 pos = curve.get_point_position(i);
if (i != 0) {
Vector2 control_pos = get_tangent_view_pos(i, TANGENT_LEFT);
draw_line(get_view_pos(pos), control_pos, tangent_color);
draw_rect(Rect2(control_pos, Vector2(1, 1)).grow(2), tangent_color);
}
if (i != curve.get_point_count() - 1) {
Vector2 control_pos = get_tangent_view_pos(i, TANGENT_RIGHT);
draw_line(get_view_pos(pos), control_pos, tangent_color);
draw_rect(Rect2(control_pos, Vector2(1, 1)).grow(2), tangent_color);
}
}
// Draw lines
draw_set_transform_matrix(_world_to_view);
const Color line_color = get_color("highlight_color", "Editor");
const Color edge_line_color = get_color("font_color", "Editor");
CanvasItemPlotCurve plot_func(*this, line_color, edge_line_color);
plot_curve_accurate(curve, 4.f / view_size.x, plot_func);
// Draw points
draw_set_transform_matrix(Transform2D());
const Color point_color = get_color("font_color", "Editor");
const Color selected_point_color = get_color("accent_color", "Editor");
for (int i = 0; i < curve.get_point_count(); ++i) {
Vector2 pos = curve.get_point_position(i);
draw_rect(Rect2(get_view_pos(pos), Vector2(1, 1)).grow(3), i == _selected_point ? selected_point_color : point_color);
// TODO Circles are prettier. Needs a fix! Or a texture
//draw_circle(pos, 2, point_color);
}
// Hover
if (_hover_point != -1) {
const Color hover_color = line_color;
Vector2 pos = curve.get_point_position(_hover_point);
stroke_rect(Rect2(get_view_pos(pos), Vector2(1, 1)).grow(_hover_radius), hover_color);
}
// Help text
if (_selected_point > 0 && _selected_point + 1 < curve.get_point_count()) {
draw_string(font, Vector2(50, font_height), TTR("Hold Shift to edit tangents individually"), text_color);
}
}
// TODO That should be part of the drawing API...
void CurveEditor::stroke_rect(Rect2 rect, Color color) {
// a---b
// | |
// c---d
Vector2 a(rect.position);
Vector2 b(rect.position.x + rect.size.x, rect.position.y);
Vector2 c(rect.position.x, rect.position.y + rect.size.y);
Vector2 d(rect.position + rect.size);
draw_line(a, b, color);
draw_line(b, d, color);
draw_line(d, c, color);
draw_line(c, a, color);
}
void CurveEditor::_bind_methods() {
ClassDB::bind_method(D_METHOD("_gui_input"), &CurveEditor::on_gui_input);
ClassDB::bind_method(D_METHOD("_on_preset_item_selected"), &CurveEditor::on_preset_item_selected);
ClassDB::bind_method(D_METHOD("_curve_changed"), &CurveEditor::_curve_changed);
ClassDB::bind_method(D_METHOD("_on_context_menu_item_selected"), &CurveEditor::on_context_menu_item_selected);
}
//---------------
CurveEditorPlugin::CurveEditorPlugin(EditorNode *p_node) {
_editor_node = p_node;
_view = memnew(CurveEditor);
_view->set_custom_minimum_size(Size2(100, 128 * EDSCALE));
_view->hide();
_toggle_button = _editor_node->add_bottom_panel_item(get_name(), _view);
_toggle_button->hide();
get_editor_interface()->get_resource_previewer()->add_preview_generator(memnew(CurvePreviewGenerator));
}
CurveEditorPlugin::~CurveEditorPlugin() {
}
void CurveEditorPlugin::edit(Object *p_object) {
Ref<Curve> curve_ref;
if (_current_ref.is_valid()) {
CurveTexture *ct = Object::cast_to<CurveTexture>(*_current_ref);
if (ct)
ct->disconnect(CoreStringNames::get_singleton()->changed, this, "_curve_texture_changed");
}
if (p_object) {
Resource *res = Object::cast_to<Resource>(p_object);
ERR_FAIL_COND(res == NULL);
ERR_FAIL_COND(!handles(p_object));
_current_ref = Ref<Resource>(Object::cast_to<Resource>(p_object));
if (_current_ref.is_valid()) {
Curve *curve = Object::cast_to<Curve>(*_current_ref);
if (curve)
curve_ref = Ref<Curve>(curve);
else {
CurveTexture *ct = Object::cast_to<CurveTexture>(*_current_ref);
if (ct) {
ct->connect(CoreStringNames::get_singleton()->changed, this, "_curve_texture_changed");
curve_ref = ct->get_curve();
}
}
}
} else {
_current_ref = Ref<Resource>();
}
_view->set_curve(curve_ref);
}
bool CurveEditorPlugin::handles(Object *p_object) const {
// Both handled so that we can keep the curve editor open
return Object::cast_to<Curve>(p_object) || Object::cast_to<CurveTexture>(p_object);
}
void CurveEditorPlugin::make_visible(bool p_visible) {
if (p_visible) {
_toggle_button->show();
_editor_node->make_bottom_panel_item_visible(_view);
} else {
_toggle_button->hide();
if (_view->is_visible_in_tree())
_editor_node->hide_bottom_panel();
}
}
void CurveEditorPlugin::_curve_texture_changed() {
// If the curve is shown indirectly as a CurveTexture is edited,
// we need to monitor when the curve property gets assigned
CurveTexture *ct = Object::cast_to<CurveTexture>(*_current_ref);
if (ct) {
_view->set_curve(ct->get_curve());
}
}
void CurveEditorPlugin::_bind_methods() {
ClassDB::bind_method(D_METHOD("_curve_texture_changed"), &CurveEditorPlugin::_curve_texture_changed);
}
//-----------------------------------
// Preview generator
bool CurvePreviewGenerator::handles(const String &p_type) const {
return p_type == "Curve";
}
Ref<Texture> CurvePreviewGenerator::generate(const Ref<Resource> &p_from) {
Ref<Curve> curve_ref = p_from;
ERR_FAIL_COND_V(curve_ref.is_null(), Ref<Texture>());
Curve &curve = **curve_ref;
int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
thumbnail_size *= EDSCALE;
Ref<Image> img_ref;
img_ref.instance();
Image &im = **img_ref;
im.create(thumbnail_size, thumbnail_size, 0, Image::FORMAT_RGBA8);
im.lock();
Color bg_color(0.1, 0.1, 0.1, 1.0);
for (int i = 0; i < thumbnail_size; i++) {
for (int j = 0; j < thumbnail_size; j++) {
im.set_pixel(i, j, bg_color);
}
}
Color line_color(0.8, 0.8, 0.8, 1.0);
float range_y = curve.get_max_value() - curve.get_min_value();
int prev_y = 0;
for (int x = 0; x < im.get_width(); ++x) {
float t = static_cast<float>(x) / im.get_width();
float v = (curve.interpolate_baked(t) - curve.get_min_value()) / range_y;
int y = CLAMP(im.get_height() - v * im.get_height(), 0, im.get_height());
// Plot point
if (y >= 0 && y < im.get_height()) {
im.set_pixel(x, y, line_color);
}
// Plot vertical line to fix discontinuity (not 100% correct but enough for a preview)
if (x != 0 && Math::abs(y - prev_y) > 1) {
int y0, y1;
if (y < prev_y) {
y0 = y;
y1 = prev_y;
} else {
y0 = prev_y;
y1 = y;
}
for (int ly = y0; ly < y1; ++ly) {
im.set_pixel(x, ly, line_color);
}
}
prev_y = y;
}
im.unlock();
Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
ptex->create_from_image(img_ref, 0);
return ptex;
}
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