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/* Copyright 2020 Stephen J. Bush
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include QMK_KEYBOARD_H
#include "etchamouse.h"
#include "pointing_device.h"
#if defined(POINTING_DEVICE_ENABLE) && defined(ENCODER_ENABLE)
/** Track movement separately in both directions. This will allow us to
* smooth out the movement along diagonals
*/
typedef struct {
bool clockwise : 1;
uint8_t count : 7;
uint16_t timer : 16;
uint16_t elapsed : 16;
} key_tracker_t;
static key_tracker_t tracker_x = {false, 0, 0, 0};
static key_tracker_t tracker_y = {false, 0, 0, 0};
/**
* @brief Calculate the mouse move units for the given tracker.
*
* By using a key tracker rederence, we can minimize the amount of space
* required on the stack. As we will have the tracker object, we will also
* take the clockwise direction into account, which completely internalizes
* the movement unit logic within this single function.
*
* @param tracker: Pointer to a key tracker object.
* @return A integer from -127 to 127
*/
static int8_t move_unit(key_tracker_t *tracker) {
if (0 == tracker->count) return 0;
const uint16_t modifier = TAPPING_TERM_MOUSE_ENCODER < tracker->elapsed ? 1 : (TAPPING_TERM_MOUSE_ENCODER - tracker->elapsed) >> 1;
uint16_t speed = MOUSEKEY_INITIAL_SPEED + MOUSEKEY_MOVE_DELTA * modifier * (tracker->count >> 1);
/* convert speed to USB mouse speed 1 to 127 */
speed = (uint8_t)(speed / (1000.0f / MOUSEKEY_INTERVAL));
speed = speed < 1 ? 1 : speed;
return (tracker->clockwise ? 1 : -1) * (speed > MOUSEKEY_MOVE_MAX ? MOUSEKEY_MOVE_MAX : speed);
}
/**
* @brief Update key press tracker
*
* Update the time elapsed since the last keypress.
* If the key has not been pressed since the tapping term, then reset the count to zero.
* If the key was pressed, update the timer and increment the count.
* Number of keypresses will degrade based on tapping term and zero out based
* on the persistenc term.
*
* @param tracker: The object to update
* @param pressed: A boolean indicating whether or not the key was pressed
* @return None.
*/
static void update_tracker(key_tracker_t *tracker, bool pressed, bool clockwise) {
tracker->elapsed = timer_elapsed(tracker->timer);
if (pressed) {
tracker->timer = timer_read();
tracker->count += 1;
tracker->clockwise = clockwise;
} else if (TAPPING_TERM_PERSISTENCE < tracker->elapsed) {
tracker->count = 0;
} else if (TAPPING_TERM_MOUSE_ENCODER < tracker->elapsed) {
tracker->count >>= 1;
}
}
bool encoder_update_mouse(uint8_t index, bool clockwise) {
report_mouse_t curr_report = pointing_device_get_report();
update_tracker(&tracker_x, 0 == index, clockwise);
update_tracker(&tracker_y, 1 == index, clockwise);
curr_report.x += move_unit(&tracker_x);
curr_report.y += move_unit(&tracker_y);
pointing_device_set_report(curr_report);
pointing_device_send();
return true;
}
#endif
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