Port to C++.

src/ship.cpp

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2018,2026  Ortega Froysa, Nicolás <nicolas@ortegas.org>
+ * Author: Ortega Froysa, Nicolás <nicolas@ortegas.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "ship.h"
+#include "event_manager.h"
+#include "globals.h"
+
+#include <cmath>
+#include <cassert>
+#include <allegro5/allegro_primitives.h>
+
+#define SHIP_RADIUS 10.0f  // radius of the ship in pixels
+
+Ship::Ship(const float x, const float y) :
+	pos(x, y), vel(0, 0), direction(0)
+{}
+
+void Ship::update(const Vec<float> &grav) {
+	if(key_is_down(KEY_RIGHT))
+		this->direction += TURN_ACCEL;
+	if(key_is_down(KEY_LEFT))
+		this->direction -= TURN_ACCEL;
+
+	// keep direction within bounds
+	if(this->direction >= M_PI * 2)
+		this->direction -= M_PI * 2;
+	else if(this->direction < 0)
+		this->direction += M_PI * 2;
+
+	if(key_is_down(KEY_UP)) {
+		this->vel.x += cos(this->direction) * ACCEL;
+		this->vel.y += sin(this->direction) * ACCEL;
+	}
+	if(key_is_down(KEY_DOWN)) {
+		// moving backwards is slower than moving forward
+		this->vel.x -= cos(this->direction) * (ACCEL / 2);
+		this->vel.y -= sin(this->direction) * (ACCEL / 2);
+	}
+
+	// Apply gravitational acceleration
+	this->vel += grav;
+	this->pos += this->vel;
+}
+
+void Ship::draw() const {
+	const float x0 = this->pos.x + (cos(this->direction) * SHIP_RADIUS);
+	const float y0 = this->pos.y + (sin(this->direction) * SHIP_RADIUS);
+	const float x1 = this->pos.x + (cos(this->direction + M_PI * 0.8f) * SHIP_RADIUS);
+	const float y1 = this->pos.y + (sin(this->direction + M_PI * 0.8f) * SHIP_RADIUS);
+	const float x2 = this->pos.x + (cos(this->direction + M_PI * 1.2f) * SHIP_RADIUS);
+	const float y2 = this->pos.y + (sin(this->direction + M_PI * 1.2f) * SHIP_RADIUS);
+	al_draw_filled_triangle(x0, y0, x1, y1, x2, y2,
+							al_map_rgb(0xFF, 0x0, 0x0));
+}