protected void MoveUntilContact(World world, float x, float y, double max)
{
for (int i = 0; i < Math.Abs(max); i += 1)
{
// Attempt adjustment.
this.X += x;
this.Y += y;
// Check with bounding boxes of solid tiles.
ReadOnlyCollection <Tile> linear = world.Tileset.AsLinear();
foreach (Tile t in linear)
{
if (t is ISolid)
{
if (BoundingBox.Check(this, t))
{
// Undo the last state and return.
this.X -= x;
this.Y -= y;
return;
}
}
}
foreach (IEntity e in world.Entities)
{
if (e == this)
{
continue;
}
if (e is ISolid)
{
if (BoundingBox.Check(this, e as IBoundingBox))
{
// Undo the last state and return.
this.X -= x;
this.Y -= y;
return;
}
}
}
}
}
public override void Update(World world)
{
base.Update(world);
// Update gravity and positions.
if (this.m_GroundTouchTimer == 0)
{
this.TouchingGroundLastStep = false;
}
else
{
this.m_GroundTouchTimer -= 1;
}
this.YSpeed += GravityEntity.Gravity;
this.X += this.XSpeed;
this.Y += this.YSpeed;
if (this.Collidable)
{
// Check with bounding boxes of solid tiles.
ReadOnlyCollection <Tile> linear = world.Tileset.AsLinear();
foreach (Tile t in linear)
{
if (t is ISolid)
{
if (BoundingBox.Check(this, t))
{
// Undo last whole step.
this.X -= this.XSpeed;
this.Y -= this.YSpeed;
// Update X / Y positions.
this.MoveUntilContact(world, this.X / Math.Abs(this.X), 0, this.XSpeed);
this.MoveUntilContact(world, 0, this.Y / Math.Abs(this.Y), this.YSpeed);
// Set Y-speed to 0.
this.YSpeed = 0;
// Set touching ground to true.
if (t.Y > this.Y)
{
this.TouchingGroundLastStep = true;
this.m_GroundTouchTimer = 3;
}
}
}
}
// Check with bounding boxes of solid entities.
foreach (IEntity e in world.Entities)
{
if (e == this)
{
continue;
}
if (e is ISolid)
{
if (BoundingBox.Check(this, e as IBoundingBox))
{
// Undo last whole step.
this.X -= this.XSpeed;
this.Y -= this.YSpeed;
// Update X / Y positions.
this.MoveUntilContact(world, this.X / Math.Abs(this.X), 0, this.XSpeed);
this.MoveUntilContact(world, 0, this.Y / Math.Abs(this.Y), this.YSpeed);
// Set Y-speed to 0.
this.YSpeed = 0;
// Set touching ground to true.
if (e.Y > this.Y)
{
this.TouchingGroundLastStep = true;
this.m_GroundTouchTimer = 3;
}
}
}
}
}
}