root / lab4 / state_machine.c @ 91
History | View | Annotate | Download (4.31 KB)
| 1 | 78 | up20180655 | #include <lcom/lcf.h> |
|---|---|---|---|
| 2 | |||
| 3 | #include "state_machine.h" |
||
| 4 | #include "mouse_macros.h" |
||
| 5 | #include "mouse.h" |
||
| 6 | #include "errors.h" |
||
| 7 | 79 | up20180655 | #include "utils.h" |
| 8 | 78 | up20180655 | |
| 9 | struct mouse_ev* mouse_get_event(struct packet *pp) { |
||
| 10 | static struct mouse_ev event; |
||
| 11 | 91 | up20180655 | static uint8_t last = 0; |
| 12 | 78 | up20180655 | |
| 13 | if (pp == NULL) |
||
| 14 | return &event;
|
||
| 15 | |||
| 16 | 91 | up20180655 | // current button presses
|
| 17 | uint8_t button_presses = pp->bytes[0] & (LEFT_BUTTON | RIGHT_BUTTON | MIDDLE_BUTTON);
|
||
| 18 | 79 | up20180655 | int16_t delta_x = pp->delta_x; |
| 19 | int16_t delta_y = pp->delta_y; |
||
| 20 | 78 | up20180655 | |
| 21 | 91 | up20180655 | if ((button_presses ^ last) == LEFT_BUTTON && !(last & LEFT_BUTTON)) {
|
| 22 | event.type = LB_PRESSED; |
||
| 23 | last |= LEFT_BUTTON; |
||
| 24 | 78 | up20180655 | |
| 25 | 91 | up20180655 | } else if ((button_presses ^ last) == RIGHT_BUTTON && !(last & RIGHT_BUTTON)) { |
| 26 | event.type = RB_PRESSED; |
||
| 27 | last |= RIGHT_BUTTON; |
||
| 28 | 78 | up20180655 | |
| 29 | 91 | up20180655 | } else if ((button_presses ^ last) == LEFT_BUTTON && (last & LEFT_BUTTON)) { |
| 30 | event.type = LB_RELEASED; |
||
| 31 | last &= ~LEFT_BUTTON; |
||
| 32 | 78 | up20180655 | |
| 33 | 91 | up20180655 | } else if ((button_presses ^ last) == RIGHT_BUTTON && (last & RIGHT_BUTTON)) { |
| 34 | event.type = RB_RELEASED; |
||
| 35 | last &= ~RIGHT_BUTTON; |
||
| 36 | |||
| 37 | } else if ((delta_x || delta_y) && (button_presses == last)) { |
||
| 38 | event.type = MOUSE_MOV; |
||
| 39 | |||
| 40 | } else
|
||
| 41 | event.type = BUTTON_EV; |
||
| 42 | |||
| 43 | event.delta_x = delta_x; |
||
| 44 | event.delta_y = delta_y; |
||
| 45 | 78 | up20180655 | return &event;
|
| 46 | } |
||
| 47 | |||
| 48 | int state_machine(struct mouse_ev* event, uint8_t x_len, uint8_t tolerance) { |
||
| 49 | |||
| 50 | static enum states state = INITIAL; |
||
| 51 | static int response = OTHER_ERROR; |
||
| 52 | static int x_length = 0; |
||
| 53 | static int y_length = 0; |
||
| 54 | |||
| 55 | if (event == NULL) |
||
| 56 | return response;
|
||
| 57 | 87 | up20180655 | |
| 58 | 78 | up20180655 | switch (state) {
|
| 59 | case INITIAL:
|
||
| 60 | if (event->type == LB_PRESSED)
|
||
| 61 | state = DRAG_UP; |
||
| 62 | break;
|
||
| 63 | case DRAG_UP:
|
||
| 64 | if (event->type == MOUSE_MOV) {
|
||
| 65 | 87 | up20180655 | if (event->delta_x < -tolerance || event->delta_y < -tolerance) {
|
| 66 | 78 | up20180655 | state = INITIAL; |
| 67 | x_length = 0;
|
||
| 68 | y_length = 0;
|
||
| 69 | break;
|
||
| 70 | } |
||
| 71 | |||
| 72 | x_length += event->delta_x; |
||
| 73 | y_length += event->delta_y; |
||
| 74 | } else if (event->type == LB_RELEASED) { |
||
| 75 | 91 | up20180655 | if (y_length < x_length || x_length < x_len) {
|
| 76 | 78 | up20180655 | state = INITIAL; |
| 77 | x_length = 0;
|
||
| 78 | y_length = 0;
|
||
| 79 | break;
|
||
| 80 | } |
||
| 81 | |||
| 82 | state = VERTEX; |
||
| 83 | x_length = 0;
|
||
| 84 | y_length = 0;
|
||
| 85 | } else {
|
||
| 86 | state = INITIAL; |
||
| 87 | x_length = 0;
|
||
| 88 | y_length = 0;
|
||
| 89 | } |
||
| 90 | break;
|
||
| 91 | case VERTEX:
|
||
| 92 | if (event->type == MOUSE_MOV) {
|
||
| 93 | if (abs(event->delta_x) > tolerance || abs(event->delta_y) > tolerance)
|
||
| 94 | state = INITIAL; |
||
| 95 | } else if (event->type == RB_PRESSED) { |
||
| 96 | state = DRAG_DOWN; |
||
| 97 | } else if (event->type == LB_PRESSED) { |
||
| 98 | state = DRAG_UP; |
||
| 99 | } else
|
||
| 100 | state = INITIAL; |
||
| 101 | break;
|
||
| 102 | case DRAG_DOWN:
|
||
| 103 | if (event->type == MOUSE_MOV) {
|
||
| 104 | 87 | up20180655 | if (event->delta_x < -tolerance || event->delta_y > tolerance) {
|
| 105 | 78 | up20180655 | state = INITIAL; |
| 106 | x_length = 0;
|
||
| 107 | y_length = 0;
|
||
| 108 | break;
|
||
| 109 | } |
||
| 110 | |||
| 111 | x_length += event->delta_x; |
||
| 112 | y_length += event->delta_y; |
||
| 113 | } else if (event->type == RB_RELEASED) { |
||
| 114 | if (x_length == 0 || y_length == 0) { |
||
| 115 | state = INITIAL; |
||
| 116 | break;
|
||
| 117 | } |
||
| 118 | |||
| 119 | 91 | up20180655 | if (y_length > -x_length || x_length < x_len) {
|
| 120 | 78 | up20180655 | state = INITIAL; |
| 121 | x_length = 0;
|
||
| 122 | y_length = 0;
|
||
| 123 | break;
|
||
| 124 | } |
||
| 125 | |||
| 126 | state = FINAL; |
||
| 127 | 79 | up20180655 | response = SUCCESS; |
| 128 | 78 | up20180655 | x_length = 0;
|
| 129 | y_length = 0;
|
||
| 130 | } else {
|
||
| 131 | state = INITIAL; |
||
| 132 | x_length = 0;
|
||
| 133 | y_length = 0;
|
||
| 134 | } |
||
| 135 | break;
|
||
| 136 | case FINAL: // acception state |
||
| 137 | response = SUCCESS; |
||
| 138 | default: // invalid state / dead state |
||
| 139 | response = INVALID_STATE; |
||
| 140 | } |
||
| 141 | return response;
|
||
| 142 | } |