Coffee & Code — Fixing Collision Detection in Super Mario Bros Flutter

In one of my previous Coffee & Code segments, I was dealing with some boundary issues for Mario, (read more todo-here).

Luckily I was able to circumvent those issues.

In order to do this, I’m no longer using the HitBox on Mario (the circle inside Mario) to determine if he’s standing on something, but instead his actual boundaries, (the box wrapped around Mario).

This approach also solved my issue of Mario being able to walk smoothly on top of Gameblocks because I’m using a flat side instead of a circle for collision detection.

/// Mario's top has collided with solid object.
bool hitTop = marioRect.top <= objRect.bottom && mario Rect.bottom >= objRect.bottom;
/// Mario's bottom has collided with solid object.
bool hitBottom = marioRect.bottom >= objRect.top && marioRect.top <= objRect.top;
/// Mario's left has collided with solid object.
bool hitLeft = marioRect. left <= objRect. right && marioRect.right >= objRect.right;
/// Mario's right has collided with solid object.
bool hitRight = marioRect.right >= objRect. left && mario Rect. left <= objRect. left;