Arrows at the screen edge that point to an attack outside the picture

A battle on the other side of a large map goes unnoticed unless something at the edge of the screen points the way. Placing an arrow at the right spot on the border, also in the corners, is a small geometry problem that most first tries get slightly wrong. Here is the calculation.

Why this works

An arrow should point at the event, not just along the border. Drawing a straight line from the middle of the screen to the event and stopping where it meets the edge gives the true direction, even in a corner, where clamping each side alone would bend it.

When not to use it

Too many arrows turn into noise, for instance in a big battle where events surround the screen. Then group them, show only the most urgent, or use a colour or a sound for the kind of danger instead of one arrow per event.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 3 common mistakes and the fix
• 29 lines of example code with 4 checks that pass
• How your AI shows you that it works

Say this to your AI

Use the Spielerando entry "Arrows at the screen edge that point to an attack outside the picture" (read_entry strategy-offscreen-event-arrows-on-edge) in my game. Build it step by step, and show me how you checked that it works.

Or skip this and connect the MCP: your AI then finds all of this by itself.Connect the MCP