root / lab4 / state_machine.c @ 93
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#include <lcom/lcf.h> |
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#include "state_machine.h" |
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#include "mouse_macros.h" |
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#include "mouse.h" |
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#include "errors.h" |
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#include "utils.h" |
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struct mouse_ev* mouse_get_event(struct packet *pp) { |
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static struct mouse_ev event; |
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static uint8_t last = 0; |
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if (pp == NULL) |
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return &event;
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// current button presses
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uint8_t button_presses = pp->bytes[0] & (LEFT_BUTTON | RIGHT_BUTTON | MIDDLE_BUTTON);
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int16_t delta_x = pp->delta_x; |
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int16_t delta_y = pp->delta_y; |
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if ((button_presses ^ last) == LEFT_BUTTON && !(last & LEFT_BUTTON)) {
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event.type = LB_PRESSED; |
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last |= LEFT_BUTTON; |
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} else if ((button_presses ^ last) == RIGHT_BUTTON && !(last & RIGHT_BUTTON)) { |
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event.type = RB_PRESSED; |
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last |= RIGHT_BUTTON; |
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} else if ((button_presses ^ last) == LEFT_BUTTON && (last & LEFT_BUTTON)) { |
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event.type = LB_RELEASED; |
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last &= ~LEFT_BUTTON; |
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} else if ((button_presses ^ last) == RIGHT_BUTTON && (last & RIGHT_BUTTON)) { |
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event.type = RB_RELEASED; |
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last &= ~RIGHT_BUTTON; |
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} else if ((delta_x || delta_y) && (button_presses == last)) { |
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event.type = MOUSE_MOV; |
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} else
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event.type = BUTTON_EV; |
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event.delta_x = delta_x; |
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event.delta_y = delta_y; |
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return &event;
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} |
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int state_machine(struct mouse_ev* event, uint8_t x_len, uint8_t tolerance) { |
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static enum states state = INITIAL; |
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static int response = OTHER_ERROR; |
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static int x_length = 0; |
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static int y_length = 0; |
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if (event == NULL) |
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return response;
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switch (state) {
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case INITIAL:
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if (event->type == LB_PRESSED)
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state = DRAG_UP; |
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break;
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case DRAG_UP:
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if (event->type == MOUSE_MOV) {
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if (event->delta_x < -tolerance || event->delta_y < -tolerance) {
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state = INITIAL; |
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x_length = 0;
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y_length = 0;
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break;
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} |
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x_length += event->delta_x; |
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y_length += event->delta_y; |
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} else if (event->type == LB_RELEASED) { |
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if (y_length < x_length || x_length < x_len) {
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state = INITIAL; |
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x_length = 0;
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y_length = 0;
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break;
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} |
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state = VERTEX; |
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x_length = 0;
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y_length = 0;
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} else {
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state = INITIAL; |
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x_length = 0;
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y_length = 0;
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} |
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break;
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case VERTEX:
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if (event->type == MOUSE_MOV) {
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x_length += event->delta_x; |
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y_length += event->delta_y; |
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if (abs(x_length) > tolerance || abs(y_length) > tolerance) {
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state = INITIAL; |
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x_length = 0;
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y_length = 0;
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} |
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} else if (event->type == RB_PRESSED) { |
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state = DRAG_DOWN; |
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x_length = 0;
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y_length = 0;
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} else if (event->type == LB_PRESSED) { |
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state = DRAG_UP; |
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x_length = 0;
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y_length = 0;
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} else {
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state = INITIAL; |
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x_length = 0;
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y_length = 0;
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} |
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break;
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case DRAG_DOWN:
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if (event->type == MOUSE_MOV) {
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if (event->delta_x < -tolerance || event->delta_y > tolerance) {
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state = INITIAL; |
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x_length = 0;
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y_length = 0;
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break;
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} |
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x_length += event->delta_x; |
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y_length += event->delta_y; |
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} else if (event->type == RB_RELEASED) { |
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if (x_length == 0 || y_length == 0) { |
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state = INITIAL; |
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break;
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} |
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if (y_length > -x_length || x_length < x_len) {
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state = INITIAL; |
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x_length = 0;
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y_length = 0;
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break;
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} |
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state = FINAL; |
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response = SUCCESS; |
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x_length = 0;
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y_length = 0;
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} else {
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state = INITIAL; |
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x_length = 0;
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y_length = 0;
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} |
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break;
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case FINAL: // acception state |
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response = SUCCESS; |
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default: // invalid state / dead state |
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response = INVALID_STATE; |
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} |
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return response;
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} |