97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include "path.h"
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command *command_new(timestamp ts, accel_t a, turn_t t){
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command* res;
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res = g_slice_new(command);
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res->ts = ts;
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res->accel = a;
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res->turn = t;
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return res;
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}
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void command_free(command* c){
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g_slice_free(command, c);
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}
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path *path_new(map* m,vehicle *v){
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command* tmp;
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path* res;
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double angle, stop;
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res = g_slice_new(path);
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res->commands = g_queue_new();
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/* Calculate a trivial path to the origin*/
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/* Turn towards origin, take shorter direction*/
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angle = atan(v->y/v->x);
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stop = abs(angle - v->dir)/m->max_turn;
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if(angle - v->dir > 0){
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/*clockwise/left turn*/
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tmp = command_new(0,BREAK,TURN_LEFT);
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g_queue_push_tail(res->commands,tmp);
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} else {
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/*counterclockwise/right turn*/
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tmp = command_new(0,BREAK,TURN_RIGHT);
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g_queue_push_tail(res->commands,tmp);
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}
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tmp = command_new(stop,BREAK,TURN_STRAIGHT);
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g_queue_push_tail(res->commands,tmp);
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/*start driving*/
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tmp = command_new(stop,ACCEL,TURN_STRAIGHT);
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g_queue_push_tail(res->commands,tmp);
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return res;
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}
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void path_execute(trial* t,path* p){
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command* tmp;
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tmp = (command*) g_queue_peek_head(p->commands);
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if(tmp == NULL){
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fprintf(stderr,"warning: cannot execute empty path\n");
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}
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if(t == NULL){
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fprintf(stderr,"trial is null\n");
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return;
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}
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/*magic number for latency, send messages that much earlier*/
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while(tmp != NULL && tmp->ts - t->last_ts < 20){
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tmp = (command*) g_queue_pop_head(p->commands);
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switch(tmp->turn){
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case TURN_HARD_LEFT: vehicle_hard_left(t); break;
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case TURN_LEFT: vehicle_left(t); break;
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case TURN_STRAIGHT: vehicle_straight(t); break;
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case TURN_RIGHT: vehicle_right(t); break;
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case TURN_HARD_RIGHT: vehicle_hard_right(t); break;
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}
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switch(tmp->accel){
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case ACCEL: vehicle_accel(t); break;
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case ROLL: vehicle_roll(t); break;
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case BREAK: vehicle_break(t); break;
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}
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command_free(tmp);
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tmp = (command*) g_queue_peek_head(p->commands);
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}
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}
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void path_free(path* p){
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int length;
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command* tmp;
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length = g_queue_get_length(p->commands);
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if(length > 0){
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fprintf(stderr,"Freeing non-empty path:\n");
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while(g_queue_get_length(p->commands) > 0){
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tmp = g_queue_pop_head(p->commands);
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fprintf(stderr,"\tTimestamp: %d Turn: %d Accel: %d\n",tmp->ts,tmp->turn,tmp->accel);
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command_free(tmp);
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}
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}
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g_queue_free(p->commands);
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g_slice_free(path,p);
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}
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