//============================================================
/*--------------------------------------
*
* Evalute vertical movement logic
* for a given actor
*
* -----------------------------------*/
internal void EvaluateVerticalMovement(Actor moving_actor)
{
Sprite sprite = moving_actor.Sprite;
Character actor = moving_actor.Character;
//-- translate the sprite vertically
if (actor.Falling)
{
Gravitate(actor); // changes acceleration rate
actor.Accelerate_Y(); // adjust speed by acceleration rate
int X = sprite.GL_Position.X;
int Y = sprite.GL_Position.Y;
//-- if speed is negative we are on the downwards part of the jump arc
if (actor.ySpeed < 0)
{
bool Landing = level.Blocks[X][Y - 1].IsSolid;
/*-------------------------------
*
* Are We About to Land?
* YES?
*
* Then stop falling.
*
* ---------------------------*/
if (Landing)
{
actor.ySpeed = 0;
actor.yAccelerationRate = 0;
actor.Falling = false;
actor.Standing = true;
sprite._Status = Status.standing;
deviceScreen_.MoveSprite(sprite, new Block(X, Y));
}
/*---------------------------
*
* NO? then keep falling
*
* ------------------------*/
else
{
sprite.Translate(0, (0 - actor.ySpeed) / 2);
}
}
//====================================================================
//-- speed is positive, so we are still on the upwards part of the jump arc
else if (actor.ySpeed > 0)
{
//-- is there a block overhead?
//-- I don't know why, but this will ONLY work at Y + 3.
if (level.Blocks[actor.BlockPosition.X][actor.BlockPosition.Y + 3].IsSolid)
{
actor.yAccelerationRate = 0;
actor.ySpeed = 0;
}
else
{
sprite.Translate(0, 0 - actor.ySpeed);
}
}
//-- speed is 0, so do nothing
}
}
