func (m *MoveFlag) checkCollisionWithWalls(obj gameObjectsBase.Activer, dir int, shift float64) (bool, geometry.Point) {
pos := obj.GetShiftedFrontSide(dir, shift)
if m.field.IsBlocked(int(math.Floor(pos.X)), int(math.Floor(pos.Y))) {
switch dir {
case consts.NORTH_DIR:
pos.Y = math.Ceil(pos.Y) + consts.OBJECT_HALF
case consts.SOUTH_DIR:
pos.Y = math.Floor(pos.Y) - consts.OBJECT_HALF
case consts.EAST_DIR:
pos.X = math.Floor(pos.X) - consts.OBJECT_HALF
case consts.WEST_DIR:
pos.X = math.Ceil(pos.X) + consts.OBJECT_HALF
}
return false, pos
}
eps := consts.SLIDE_THRESHOLD
side, pos := obj.GetCollisionableSide(dir, shift)
res1 := m.field.IsBlocked(int(side.Point1.X), int(side.Point1.Y))
res2 := m.field.IsBlocked(int(side.Point2.X), int(side.Point2.Y))
var near float64
if res1 || res2 {
switch dir {
case consts.NORTH_DIR, consts.SOUTH_DIR:
if res1 {
near = math.Ceil(side.Point1.X) - side.Point1.X
} else {
near = math.Floor(side.Point1.X) - side.Point1.X
}
if math.Abs(near) <= eps {
side.Point1.X = side.Point1.X + near
side.Point2.X = side.Point2.X + near
} else {
return false, obj.GetCenter()
}
pos.X = (side.Point1.X + side.Point2.X) / 2
case consts.EAST_DIR, consts.WEST_DIR:
if res1 {
near = math.Ceil(side.Point1.Y) - side.Point1.Y
} else {
near = math.Floor(side.Point1.Y) - side.Point1.Y
}
if math.Abs(near) <= eps {
side.Point1.Y = side.Point1.Y + near
side.Point2.Y = side.Point2.Y + near
} else {
return false, obj.GetCenter()
}
pos.Y = (side.Point1.Y + side.Point2.Y) / 2
}
}
return true, pos
}
