Move view to keep player on-screen

app/main.c

@@ -234,6 +234,16 @@ int main(int argc, char *argv[])
 			ppos.y += (double)dt / 1000.0 * pvel.y;
 		}
 
+		// Update view
+		const dvec_t pvdisp = {
+			.x = ppos.x - (vpos.x + VIEWWIDTH / 2),
+			.y = ppos.y - (vpos.y + VIEWHEIGHT / 2),
+		};
+		if (mag(pvdisp) > 72) {
+			vpos.x += (double)dt / 1000.0 * pvel.x;
+			vpos.y += (double)dt / 1000.0 * pvel.y;
+		}
+
 		SDL_RenderClear(renderer);
 
 		// Draw map