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hitTests
Author: James Smith

You may be thinking, if you want a character on screen to not run into a wall, why not check if the character mc is hitting the wall mc? well, two reasons, you cannot detect the shape of either mc when using the mc vs mc method, it only checks the bounding box, so you cannot have rooms, or anything other than a square (in programming terms), and also when youve collided with a wall, you need to test whether where youre moving to is not further into the wall, so you can move away from the wall.

The best way that I have found to stop collisions with walls is to do a hittest with the place that the mc is about to walk to, before he walks there.

instead of something like

if (Key.isDown(key.RIGHT)){
_x++
}

you need to add

if (Key.isDown(key.RIGHT)){
if (NOT(this.hitTest(_x+1,_y,TRUE))){
_x++
}
}

(NOT(this.hitTest(_x+1,_y,TRUE))) can be read as" if there is not a collision with the point to the right of where the mc is now"

What I like to do is make a point object, because I have been known to not put things on the _root level, and by doing that I can just localToGlobal it

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