package d2map import ( "math" "github.com/OpenDiablo2/OpenDiablo2/d2common" "github.com/beefsack/go-astar" ) // mapEntity represents an entity on the map that can be animated type mapEntity struct { LocationX float64 LocationY float64 TileX, TileY int // Coordinates of the tile the unit is within subcellX, subcellY float64 // Subcell coordinates within the current tile weaponClass string offsetX, offsetY int TargetX float64 TargetY float64 Speed float64 path []astar.Pather done func() directioner func(angle float64) } // createMapEntity creates an instance of mapEntity func createMapEntity(x, y int) mapEntity { locX, locY := float64(x), float64(y) return mapEntity{ LocationX: locX, LocationY: locY, TargetX: locX, TargetY: locY, TileX: x / 5, TileY: y / 5, subcellX: 1 + math.Mod(locX, 5), subcellY: 1 + math.Mod(locY, 5), Speed: 6, path: []astar.Pather{}, } } func (m *mapEntity) SetPath(path []astar.Pather, done func()) { m.path = path m.done = done } func (m *mapEntity) getStepLength(tickTime float64) (float64, float64) { length := tickTime * m.Speed angle := 359 - d2common.GetAngleBetween( m.LocationX, m.LocationY, m.TargetX, m.TargetY, ) radians := (math.Pi / 180.0) * float64(angle) oneStepX := length * math.Cos(radians) oneStepY := length * math.Sin(radians) return oneStepX, oneStepY } func (m *mapEntity) IsAtTarget() bool { return m.LocationX == m.TargetX && m.LocationY == m.TargetY && !m.HasPathFinding() } func (m *mapEntity) Step(tickTime float64) { if m.IsAtTarget() { if m.done != nil { m.done() m.done = nil } return } stepX, stepY := m.getStepLength(tickTime) if d2common.AlmostEqual(m.LocationX, m.TargetX, stepX) { m.LocationX = m.TargetX } if d2common.AlmostEqual(m.LocationY, m.TargetY, stepY) { m.LocationY = m.TargetY } if m.LocationX != m.TargetX { m.LocationX += stepX } if m.LocationY != m.TargetY { m.LocationY += stepY } m.subcellX = 1 + math.Mod(m.LocationX, 5) m.subcellY = 1 + math.Mod(m.LocationY, 5) m.TileX = int(m.LocationX / 5) m.TileY = int(m.LocationY / 5) if (m.LocationX != m.TargetX) || (m.LocationY != m.TargetY) { return } if len(m.path) > 0 { m.SetTarget(m.path[0].(*PathTile).X*5, m.path[0].(*PathTile).Y*5, m.done) if len(m.path) > 1 { m.path = m.path[1:] } else { m.path = []astar.Pather{} } return } } func (m *mapEntity) HasPathFinding() bool { return len(m.path) > 0 } // SetTarget sets target coordinates and changes animation based on proximity and direction func (m *mapEntity) SetTarget(tx, ty float64, done func()) { m.TargetX, m.TargetY = tx, ty m.done = done if m.directioner != nil { angle := 359 - d2common.GetAngleBetween( m.LocationX, m.LocationY, tx, ty, ) m.directioner(float64(angle)) } } func angleToDirection(angle float64) int { degreesPerDirection := 360.0 / 64.0 offset := 45.0 - (degreesPerDirection / 2) newDirection := int((angle - offset) / degreesPerDirection) if newDirection >= 64 { newDirection = newDirection - 64 } else if newDirection < 0 { newDirection = 64 + newDirection } return newDirection } func (m *mapEntity) GetPosition() (float64, float64) { return float64(m.TileX), float64(m.TileY) }