root / lab4 / state_machine.c @ 121
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| 1 | 78 | up20180655 | #include <lcom/lcf.h> |
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| 2 | |||
| 3 | #include "state_machine.h" |
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| 4 | #include "mouse_macros.h" |
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| 5 | #include "mouse.h" |
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| 6 | #include "errors.h" |
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| 7 | 79 | up20180655 | #include "utils.h" |
| 8 | 78 | up20180655 | |
| 9 | struct mouse_ev* mouse_get_event(struct packet *pp) { |
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| 10 | static struct mouse_ev event; |
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| 11 | 91 | up20180655 | static uint8_t last = 0; |
| 12 | 78 | up20180655 | |
| 13 | if (pp == NULL) |
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| 14 | return &event;
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| 15 | |||
| 16 | 91 | up20180655 | // current button presses
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| 17 | uint8_t button_presses = pp->bytes[0] & (LEFT_BUTTON | RIGHT_BUTTON | MIDDLE_BUTTON);
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| 18 | 79 | up20180655 | int16_t delta_x = pp->delta_x; |
| 19 | int16_t delta_y = pp->delta_y; |
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| 20 | 78 | up20180655 | |
| 21 | 91 | up20180655 | if ((button_presses ^ last) == LEFT_BUTTON && !(last & LEFT_BUTTON)) {
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| 22 | event.type = LB_PRESSED; |
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| 23 | last |= LEFT_BUTTON; |
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| 24 | 78 | up20180655 | |
| 25 | 91 | up20180655 | } else if ((button_presses ^ last) == RIGHT_BUTTON && !(last & RIGHT_BUTTON)) { |
| 26 | event.type = RB_PRESSED; |
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| 27 | last |= RIGHT_BUTTON; |
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| 28 | 78 | up20180655 | |
| 29 | 91 | up20180655 | } else if ((button_presses ^ last) == LEFT_BUTTON && (last & LEFT_BUTTON)) { |
| 30 | event.type = LB_RELEASED; |
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| 31 | last &= ~LEFT_BUTTON; |
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| 32 | 78 | up20180655 | |
| 33 | 91 | up20180655 | } else if ((button_presses ^ last) == RIGHT_BUTTON && (last & RIGHT_BUTTON)) { |
| 34 | event.type = RB_RELEASED; |
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| 35 | last &= ~RIGHT_BUTTON; |
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| 36 | |||
| 37 | } else if ((delta_x || delta_y) && (button_presses == last)) { |
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| 38 | event.type = MOUSE_MOV; |
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| 39 | |||
| 40 | } else
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| 41 | event.type = BUTTON_EV; |
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| 42 | |||
| 43 | event.delta_x = delta_x; |
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| 44 | event.delta_y = delta_y; |
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| 45 | 78 | up20180655 | return &event;
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| 46 | } |
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| 47 | |||
| 48 | int state_machine(struct mouse_ev* event, uint8_t x_len, uint8_t tolerance) { |
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| 49 | |||
| 50 | static enum states state = INITIAL; |
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| 51 | static int response = OTHER_ERROR; |
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| 52 | static int x_length = 0; |
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| 53 | static int y_length = 0; |
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| 54 | |||
| 55 | if (event == NULL) |
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| 56 | return response;
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| 57 | 87 | up20180655 | |
| 58 | 78 | up20180655 | switch (state) {
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| 59 | case INITIAL:
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| 60 | if (event->type == LB_PRESSED)
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| 61 | state = DRAG_UP; |
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| 62 | break;
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| 63 | case DRAG_UP:
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| 64 | if (event->type == MOUSE_MOV) {
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| 65 | 87 | up20180655 | if (event->delta_x < -tolerance || event->delta_y < -tolerance) {
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| 66 | 78 | up20180655 | state = INITIAL; |
| 67 | x_length = 0;
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| 68 | y_length = 0;
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| 69 | break;
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| 70 | } |
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| 71 | |||
| 72 | x_length += event->delta_x; |
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| 73 | y_length += event->delta_y; |
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| 74 | } else if (event->type == LB_RELEASED) { |
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| 75 | 91 | up20180655 | if (y_length < x_length || x_length < x_len) {
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| 76 | 78 | up20180655 | state = INITIAL; |
| 77 | x_length = 0;
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| 78 | y_length = 0;
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| 79 | break;
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| 80 | } |
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| 81 | |||
| 82 | state = VERTEX; |
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| 83 | x_length = 0;
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| 84 | y_length = 0;
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| 85 | } else {
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| 86 | state = INITIAL; |
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| 87 | x_length = 0;
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| 88 | y_length = 0;
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| 89 | } |
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| 90 | break;
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| 91 | case VERTEX:
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| 92 | if (event->type == MOUSE_MOV) {
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| 93 | 92 | up20180655 | x_length += event->delta_x; |
| 94 | y_length += event->delta_y; |
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| 95 | if (abs(x_length) > tolerance || abs(y_length) > tolerance) {
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| 96 | 78 | up20180655 | state = INITIAL; |
| 97 | 92 | up20180655 | x_length = 0;
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| 98 | y_length = 0;
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| 99 | } |
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| 100 | 78 | up20180655 | } else if (event->type == RB_PRESSED) { |
| 101 | state = DRAG_DOWN; |
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| 102 | 92 | up20180655 | x_length = 0;
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| 103 | y_length = 0;
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| 104 | 78 | up20180655 | } else if (event->type == LB_PRESSED) { |
| 105 | state = DRAG_UP; |
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| 106 | 92 | up20180655 | x_length = 0;
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| 107 | y_length = 0;
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| 108 | } else {
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| 109 | 78 | up20180655 | state = INITIAL; |
| 110 | 92 | up20180655 | x_length = 0;
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| 111 | y_length = 0;
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| 112 | } |
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| 113 | 78 | up20180655 | break;
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| 114 | case DRAG_DOWN:
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| 115 | if (event->type == MOUSE_MOV) {
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| 116 | 87 | up20180655 | if (event->delta_x < -tolerance || event->delta_y > tolerance) {
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| 117 | 78 | up20180655 | state = INITIAL; |
| 118 | x_length = 0;
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| 119 | y_length = 0;
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| 120 | break;
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| 121 | } |
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| 122 | |||
| 123 | x_length += event->delta_x; |
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| 124 | y_length += event->delta_y; |
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| 125 | } else if (event->type == RB_RELEASED) { |
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| 126 | if (x_length == 0 || y_length == 0) { |
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| 127 | state = INITIAL; |
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| 128 | break;
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| 129 | } |
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| 130 | |||
| 131 | 91 | up20180655 | if (y_length > -x_length || x_length < x_len) {
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| 132 | 78 | up20180655 | state = INITIAL; |
| 133 | x_length = 0;
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| 134 | y_length = 0;
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| 135 | break;
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| 136 | } |
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| 137 | |||
| 138 | state = FINAL; |
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| 139 | 79 | up20180655 | response = SUCCESS; |
| 140 | 78 | up20180655 | x_length = 0;
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| 141 | y_length = 0;
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| 142 | } else {
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| 143 | state = INITIAL; |
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| 144 | x_length = 0;
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| 145 | y_length = 0;
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| 146 | } |
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| 147 | break;
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| 148 | case FINAL: // acception state |
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| 149 | response = SUCCESS; |
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| 150 | default: // invalid state / dead state |
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| 151 | response = INVALID_STATE; |
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| 152 | } |
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| 153 | return response;
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| 154 | } |