49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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/** \file
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* \ingroup bli
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*
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* \note dials act similar to old rotation based phones and output an angle.
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*
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* They just are initialized with the center of the dial and a threshold value as input.
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*
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* When the distance of the current position of the dial from the center
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* exceeds the threshold, this position is used to calculate the initial direction.
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* After that, the angle from the initial direction is calculated based on
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* current and previous directions of the digit, and returned to the user.
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*
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* Usage examples:
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*
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* \code{.c}
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* float start_position[2] = {0.0f, 0.0f};
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* float current_position[2];
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* float threshold = 0.5f;
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* float angle;
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* Dial *dial;
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*
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* dial = BLI_dial_init(start_position, threshold);
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*
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* angle = BLI_dial_angle(dial, current_position);
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*
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* MEM_freeN(dial);
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* \endcode
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct Dial Dial;
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Dial *BLI_dial_init(const float start_position[2], float threshold);
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float BLI_dial_angle(Dial *dial, const float current_position[2]);
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#ifdef __cplusplus
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}
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#endif
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