From e3fc1ec1a0761a355cb6a839cba8db0200e77a0e Mon Sep 17 00:00:00 2001
From: davidovski <david@sendula.com>
Date: Tue, 20 Apr 2021 20:34:53 +0100
Subject: initial commit

---
 Makefile    | 11 ++++++++
 asteroids.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 100 insertions(+)
 create mode 100644 Makefile
 create mode 100644 asteroids.c

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b06d04f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+PROG=asteroids
+CC=gcc
+FLAGS=-lm `pkg-config -libs raylib`
+
+.DEFAULT_GOAL := run
+
+${PROG}: ${PROG}.c
+	${CC} ${PROG}.c -o ${PROG} ${FLAGS}
+
+run: ${PROG}
+	./${PROG}
diff --git a/asteroids.c b/asteroids.c
new file mode 100644
index 0000000..d1c3b27
--- /dev/null
+++ b/asteroids.c
@@ -0,0 +1,89 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <raylib.h>
+#include <math.h>
+
+const int height = 800;
+const int width = 800;
+const int fps = 60;
+
+const Color bg = BLACK;
+const Color fg = GREEN;
+
+const float NOSE = PI/8;
+const int LENGTH = 36;
+const float THRUST = 0.1;
+const int SKY_SIZE = 256;
+
+Vector2 pos = {(float) height / 2, (float) width / 2};
+Vector2 vel = {0.0f, 0.0f};
+float angle = 0;
+
+Vector2 * sky;
+
+Vector2 * generateSky() {
+	Vector2 s[SKY_SIZE];
+	for (int i = 0; i < SKY_SIZE; i++) {
+		s[i] = (Vector2){rand() % width, rand() % height};
+	} 
+	return s;
+}
+
+Vector2 wingpos(int w) {
+	// optimise this maths
+	int x, y;
+	float a;
+	
+	if (w > 0) a = angle + (NOSE / 2.0f);
+	else if (w < 0) a = angle - (NOSE / 2.0f);
+
+	x = pos.x - LENGTH * sin(a);
+	y = pos.y - LENGTH * cos(a);
+	return (Vector2){x, y};
+}
+
+int accelerate(float m) {
+	vel.x += sin(angle) * m;
+	vel.y += cos(angle) * m;
+}
+
+int drawPlayer() {
+	DrawTriangleLines(
+		pos,
+		wingpos(-1),
+		wingpos(1),	
+		fg
+	);
+}
+
+int draw() {
+	BeginDrawing();
+	ClearBackground(BLACK);
+	
+	drawPlayer();
+	EndDrawing();
+}
+
+int update() {
+	if (IsKeyDown(KEY_RIGHT)) angle -= 0.1f;
+	if (IsKeyDown(KEY_LEFT)) angle += 0.1f;
+	
+	if (IsKeyDown(KEY_UP)) accelerate(THRUST);
+
+
+	pos.x += vel.x;
+	pos.y += vel.y;
+}
+
+int main() {
+	sky = generateSky();
+	InitWindow(width, height, "game");
+	SetTargetFPS(60);
+
+	while (!WindowShouldClose()) {
+		update();
+		draw();
+	}
+	CloseWindow();
+	return 0;
+}
-- 
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