CNA Samples

Spacewar

Two-player starship combat in classic Retro lines or textured Evolved 3D.

Bounce

One hundred lit spheres, implicit collision response and gravity controlled by tilt or arrow keys.

Collision Sample

Animated triangle and oriented-box collision tests alongside XNA's geometric primitives.

Per-Pixel Collision

Falling blocks only hit when their visible pixels touch the player, not just their rectangles.

Rectangle Collision

A falling block counts as a hit when its rectangle overlaps the player's, even if their visible pixels miss.

Transformed Collision

Rotated falling blocks only hit when their visible pixels touch the player.

Transformed Collision Test

Drag, rotate and scale two sprites to explore transformed per-pixel collision.

Path Drawing

Draw a route from the tank with touch or mouse and watch it follow the waypoints.

Pathfinding

Compare three route-finding algorithms across four maps, then watch the tank follow the path.

Waypoint Navigation

Place waypoints for a tank, then compare direct movement with smooth steering.

Flocking

Tune how birds gather, separate and flee from a cat.

Chase and Evade

Move the cat while a tank chases it and a mouse flees or wanders nearby.