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2D Editor: modified zoom increment to the twelveth root of two

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- properly visit power of 2 factors (50%, 100%, 200%...)
- index based zoom values to prevent floating point issues
- Fix 2d editor not able to reach min and max zoom values

(cherry picked from commit fea6ca20c9)
This commit is contained in:
johan 2020-03-15 14:13:07 -04:00 committed by Rémi Verschelde
parent d80b27f5a6
commit 48a4f7e3a7
2 changed files with 47 additions and 7 deletions
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53
editor/plugins/canvas_item_editor_plugin.cpp
View file

@ -53,8 +53,10 @@
#include "scene/main/viewport.h"
#include "scene/resources/packed_scene.h"
#define MIN_ZOOM 0.01
#define MAX_ZOOM 100
// Min and Max are power of two in order to play nicely with successive increment.
// That way, we can naturally reach a 100% zoom from boundaries.
#define MIN_ZOOM 1. / 128
#define MAX_ZOOM 128
#define RULER_WIDTH (15 * EDSCALE)
#define SCALE_HANDLE_DISTANCE 25
@ -1191,7 +1193,11 @@ bool CanvasItemEditor::_gui_input_zoom_or_pan(const Ref<InputEvent> &p_event, bo
view_offset.y += int(EditorSettings::get_singleton()->get("editors/2d/pan_speed")) / zoom * b->get_factor();
update_viewport();
} else {
_zoom_on_position(zoom * (1 - (0.05 * b->get_factor())), b->get_position());
float new_zoom = _get_next_zoom_value(-1);
if (b->get_factor() != 1.f) {
new_zoom = zoom * ((new_zoom / zoom - 1.f) * b->get_factor() + 1.f);
}
_zoom_on_position(new_zoom, b->get_position());
}
return true;
}
@ -1202,7 +1208,11 @@ bool CanvasItemEditor::_gui_input_zoom_or_pan(const Ref<InputEvent> &p_event, bo
view_offset.y -= int(EditorSettings::get_singleton()->get("editors/2d/pan_speed")) / zoom * b->get_factor();
update_viewport();
} else {
_zoom_on_position(zoom * ((0.95 + (0.05 * b->get_factor())) / 0.95), b->get_position());
float new_zoom = _get_next_zoom_value(1);
if (b->get_factor() != 1.f) {
new_zoom = zoom * ((new_zoom / zoom - 1.f) * b->get_factor() + 1.f);
}
_zoom_on_position(new_zoom, b->get_position());
}
return true;
}
@ -4216,8 +4226,37 @@ void CanvasItemEditor::_set_anchors_preset(Control::LayoutPreset p_preset) {
undo_redo->commit_action();
}
float CanvasItemEditor::_get_next_zoom_value(int p_increment_count) const {
// Base increment factor defined as the twelveth root of two.
// This allow a smooth geometric evolution of the zoom, with the advantage of
// visiting all integer power of two scale factors.
// note: this is analogous to the 'semitones' interval in the music world
// In order to avoid numerical imprecisions, we compute and edit a zoom index
// with the following relation: zoom = 2 ^ (index / 12)
if (zoom < CMP_EPSILON || p_increment_count == 0) {
return 1.f;
}
// Remove Editor scale from the index computation
float zoom_noscale = zoom / MAX(1, EDSCALE);
// zoom = 2**(index/12) => log2(zoom) = index/12
float closest_zoom_index = Math::round(Math::log(zoom_noscale) * 12.f / Math::log(2.f));
float new_zoom_index = closest_zoom_index + p_increment_count;
float new_zoom = Math::pow(2.f, new_zoom_index / 12.f);
// Restore Editor scale transformation
new_zoom *= MAX(1, EDSCALE);
return new_zoom;
}
void CanvasItemEditor::_zoom_on_position(float p_zoom, Point2 p_position) {
if (p_zoom < MIN_ZOOM || p_zoom > MAX_ZOOM)
p_zoom = CLAMP(p_zoom, MIN_ZOOM, MAX_ZOOM);
if (p_zoom == zoom)
return;
float prev_zoom = zoom;
@ -4258,7 +4297,7 @@ void CanvasItemEditor::_update_zoom_label() {
}
void CanvasItemEditor::_button_zoom_minus() {
_zoom_on_position(zoom / Math_SQRT2, viewport_scrollable->get_size() / 2.0);
_zoom_on_position(_get_next_zoom_value(-6), viewport_scrollable->get_size() / 2.0);
}
void CanvasItemEditor::_button_zoom_reset() {
@ -4266,7 +4305,7 @@ void CanvasItemEditor::_button_zoom_reset() {
}
void CanvasItemEditor::_button_zoom_plus() {
_zoom_on_position(zoom * Math_SQRT2, viewport_scrollable->get_size() / 2.0);
_zoom_on_position(_get_next_zoom_value(6), viewport_scrollable->get_size() / 2.0);
}
void CanvasItemEditor::_button_toggle_smart_snap(bool p_status) {

1
editor/plugins/canvas_item_editor_plugin.h
View file

@ -533,6 +533,7 @@ private:
VBoxContainer *controls_vb;
HBoxContainer *zoom_hb;
float _get_next_zoom_value(int p_increment_count) const;
void _zoom_on_position(float p_zoom, Point2 p_position = Point2());
void _update_zoom_label();
void _button_zoom_minus();