82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
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/*
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* Copyright (C) 2018 Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
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* Author: Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ship.h"
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#include "event_manager.h"
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#include "globals.h"
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#ifdef DEBUG
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# include <stdio.h>
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#endif
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#include <math.h>
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#ifndef M_PI
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# define M_PI 3.14159265f
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#endif
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#define ACCEL 5.0f
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#define TURN_ACCEL (M_PI / FPS) // turn at pi radians / sec
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void ship_init(struct ship *ship, int x, int y) {
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if(!ship)
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{
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#ifdef DEBUG
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fprintf(stderr,
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"ship_init(struct ship*,int,int): invalid ship.\n");
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#endif
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return;
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}
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ship->x = x;
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ship->y = y;
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ship->velX = ship->velY = 0;
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ship->direction = 0;
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}
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void ship_update(struct ship *ship) {
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if(!ship)
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{
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#ifdef DEBUG
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fprintf(stderr,
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"ship_update(struct ship*): invalid ship.\n");
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#endif
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return;
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}
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if(key_is_down(KEY_UP))
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{
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ship->velX += cos(ship->direction) * ACCEL;
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ship->velY += sin(ship->direction) * ACCEL;
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}
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if(key_is_down(KEY_DOWN))
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{
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// moving backwards is slower than moving forward
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ship->velX -= cos(ship->direction) * (ACCEL / 2);
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ship->velY -= sin(ship->direction) * (ACCEL / 2);
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}
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if(key_is_down(KEY_RIGHT))
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ship->direction -= TURN_ACCEL;
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if(key_is_down(KEY_LEFT))
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ship->direction += TURN_ACCEL;
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// keep direction within bounds
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if(ship->direction >= M_PI * 2)
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ship->direction -= M_PI * 2;
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else if(ship->direction < 0)
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ship->direction += M_PI * 2;
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}
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