1 files changed, 36 insertions, 0 deletions
diff --git a/lib/player.c b/lib/player.c
new file mode 100644
index 0000000..35c3b80
--- /dev/null
+++ b/lib/player.c
@@ -0,0 +1,36 @@
+#include "snapshot.h"
+
+#include "player.h"
+
+vec2
+dp_player_calculate_acceleration(const struct player *p)
+{
+	vec2 acc, dec;
+	int x = 0, y = 0;
+
+	if (p->input & INPUT_UP)
+	{
+		y -= 1;
+	}
+	if (p->input & INPUT_DOWN)
+	{
+		y += 1;
+	}
+
+	if (p->input & INPUT_LEFT)
+	{
+		x -= 1;
+	}
+	if (p->input & INPUT_RIGHT)
+	{
+		x += 1;
+	}
+
+	acc = dp_vec2_new((float)x, (float)y);
+	acc = dp_vec2_normal(acc);
+	acc = dp_vec2_mul(acc, PLAYER_ACCELERATION);
+
+	dec = dp_vec2_mul(p->vel, -1.0f * PLAYER_DRAG);
+
+	return dp_vec2_add(acc, dec);
+}