barrel.ps

If dustbin is colliding with a girl
    If she is moving through the left side of the dustbin
        Move the dustbin horizontally so its left side is touching the girl's right
    If she is moving through the right side of the dustbin
        Move the dustbin horizontally so its right side is touching the girl's left

girl.ps

If girl colliding with a dustbin
    If she is falling through the dustbin
        Move her vertically so the soles of her feet are on the top of the dustbin
        Set her vertical velocity to 0
    If she is rising up through the dustbin
        Move her vertically so the top of her head touching the bottom of the dustbin
        Set her vertical velocity to 0
    If she is moving through the right side of the dustbin
        Move her horizontally so her right side is touching the left of the dustbin
    If she is moving through the left side of the dustbin
        Move her horizontally so her left side is touching the right of the dustbin

girlfunctions.ps

If girl is falling
    If her feet are lower than the top of the bin
        If her feet are higher than the top of the bin + maximum speed
            The girl is falling through the bin

If the girl is rising
    If her head is higher than the bottom of the bin
        If her head is lower than the bottom of the bin - maximum speed
            The girl is bumping against the bottom of the bin

If the girl's right side is past the bin's left side
    If her left side is not past the bin's left side
        If she is not on top of the bin
            She is bumping against the left side of the bin

If the girl's left side is past the bin's right side
    If her right side is not past the bin's right side
        If she is not on top of the bin
            She is bumping against the right side of the bin

rectfromline.ps

x: p1.x
y: p1.y
width: p2.x - p1.x
height: p2.y - p1.y

sweeping.ps

If this grenade is colliding with an object
    If grenade bounding box overlapping line defining left side of object
        Run reverseAngle() function, passing "left" for sideHit

    If grenade bounding box overlapping line defining right side of object
        Run reverseAngle() function, passing "right" for sideHit

    If grenade bounding box overlapping line defining bottom side of object
        Run reverseAngle() function, passing "bottom" for sideHit

    If grenade bounding box overlapping line defining top side of object
        Run reverseAngle() function, passing "top" for sideHit

    No overlaps, so sweep the object:
        Reverse velocity
        Divide velocity by some number, like 5, so we don't jump over a side
        Move grenade by divided and reversed velocity
        Test for collision again (return to the top)