dd168a35c5
The general idea is to keep the 'old', C-style MEM_callocN signature, and slowly replace most of its usages with the new, C++-style type-safer template version. * `MEM_cnew<T>` allocation version is renamed to `MEM_callocN<T>`. * `MEM_cnew_array<T>` allocation version is renamed to `MEM_calloc_arrayN<T>`. * `MEM_cnew<T>` duplicate version is renamed to `MEM_dupallocN<T>`. Similar templates type-safe version of `MEM_mallocN` will be added soon as well. Following discussions in !134452. NOTE: For now static type checking in `MEM_callocN` and related are slightly different for Windows MSVC. This compiler seems to consider structs using the `DNA_DEFINE_CXX_METHODS` macro as non-trivial (likely because their default copy constructors are deleted). So using checks on trivially constructible/destructible instead on this compiler/system. Pull Request: https://projects.blender.org/blender/blender/pulls/134771
96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
|
|
/** \file
|
|
* \ingroup bli
|
|
*/
|
|
|
|
#include "BLI_dial_2d.h"
|
|
|
|
#include "MEM_guardedalloc.h"
|
|
|
|
#include "BLI_math_vector.h"
|
|
|
|
struct Dial {
|
|
/* center of the dial */
|
|
float center[2];
|
|
|
|
/* threshold of the dial. Distance of current position has to be greater
|
|
* than the threshold to be used in any calculations */
|
|
float threshold_squared;
|
|
|
|
/* the direction of the first dial position exceeding the threshold. This
|
|
* is later used as the basis against which rotation angle is calculated */
|
|
float initial_direction[2];
|
|
|
|
/* cache the last angle to detect rotations bigger than -/+ PI */
|
|
float last_angle;
|
|
|
|
/* number of full rotations */
|
|
int rotations;
|
|
|
|
/* has initial_direction been initialized */
|
|
bool initialized;
|
|
};
|
|
|
|
Dial *BLI_dial_init(const float start_position[2], float threshold)
|
|
{
|
|
Dial *dial = MEM_callocN<Dial>("dial");
|
|
|
|
copy_v2_v2(dial->center, start_position);
|
|
dial->threshold_squared = threshold * threshold;
|
|
|
|
return dial;
|
|
}
|
|
|
|
void BLI_dial_free(Dial *dial)
|
|
{
|
|
MEM_freeN(dial);
|
|
}
|
|
|
|
float BLI_dial_angle(Dial *dial, const float current_position[2])
|
|
{
|
|
float current_direction[2];
|
|
|
|
sub_v2_v2v2(current_direction, current_position, dial->center);
|
|
|
|
/* only update when we have enough precision,
|
|
* by having the mouse adequately away from center */
|
|
if (len_squared_v2(current_direction) > dial->threshold_squared) {
|
|
float angle;
|
|
float cosval, sinval;
|
|
|
|
normalize_v2(current_direction);
|
|
|
|
if (!dial->initialized) {
|
|
copy_v2_v2(dial->initial_direction, current_direction);
|
|
dial->initialized = true;
|
|
}
|
|
|
|
/* calculate mouse angle between initial and final mouse position */
|
|
cosval = dot_v2v2(current_direction, dial->initial_direction);
|
|
sinval = cross_v2v2(current_direction, dial->initial_direction);
|
|
|
|
/* Clamp to avoid NAN's in #acos */
|
|
angle = atan2f(sinval, cosval);
|
|
|
|
/* change of sign, we passed the 180 degree threshold. This means we need to add a turn.
|
|
* to distinguish between transition from 0 to -1 and -PI to +PI,
|
|
* use comparison with PI/2 */
|
|
if ((angle * dial->last_angle < 0.0f) && (fabsf(dial->last_angle) > float(M_PI_2))) {
|
|
if (dial->last_angle < 0.0f) {
|
|
dial->rotations--;
|
|
}
|
|
else {
|
|
dial->rotations++;
|
|
}
|
|
}
|
|
dial->last_angle = angle;
|
|
|
|
return angle + 2.0f * float(M_PI) * dial->rotations;
|
|
}
|
|
|
|
return dial->last_angle;
|
|
}
|