package d2render import ( "math" "math/rand" "github.com/OpenDiablo2/D2Shared/d2common/d2enum" "github.com/OpenDiablo2/D2Shared/d2data/d2datadict" "github.com/OpenDiablo2/D2Shared/d2helper" "github.com/OpenDiablo2/OpenDiablo2/d2asset" "github.com/OpenDiablo2/OpenDiablo2/d2render/d2surface" ) // AnimatedEntity represents an entity on the map that can be animated type AnimatedEntity 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 animationMode string weaponClass string direction int offsetX, offsetY int32 TargetX float64 TargetY float64 action int32 repetitions int composite *d2asset.Composite } // CreateAnimatedEntity creates an instance of AnimatedEntity func CreateAnimatedEntity(x, y int32, object *d2datadict.ObjectLookupRecord, palettePath string) (*AnimatedEntity, error) { composite, err := d2asset.LoadComposite(object, palettePath) if err != nil { return nil, err } entity := &AnimatedEntity{composite: composite} entity.LocationX = float64(x) entity.LocationY = float64(y) entity.TargetX = entity.LocationX entity.TargetY = entity.LocationY entity.TileX = int(entity.LocationX / 5) entity.TileY = int(entity.LocationY / 5) entity.subcellX = 1 + math.Mod(entity.LocationX, 5) entity.subcellY = 1 + math.Mod(entity.LocationY, 5) return entity, nil } // SetMode changes the graphical mode of this animated entity func (v *AnimatedEntity) SetMode(animationMode, weaponClass string, direction int) error { v.animationMode = animationMode v.direction = direction err := v.composite.SetMode(animationMode, weaponClass, direction) if err != nil { err = v.composite.SetMode(animationMode, "HTH", direction) } return err } // If an npc has a path to pause at each location. // Waits for animation to end and all repetitions to be exhausted. func (v AnimatedEntity) Wait() bool { return v.composite.GetPlayedCount() > v.repetitions } // Render draws this animated entity onto the target func (v *AnimatedEntity) Render(target *d2surface.Surface) { target.PushTranslation( int(v.offsetX)+int((v.subcellX-v.subcellY)*16), int(v.offsetY)+int(((v.subcellX+v.subcellY)*8)-5), ) defer target.Pop() v.composite.Render(target) } func (v AnimatedEntity) GetDirection() int { return v.direction } func (v *AnimatedEntity) getStepLength(tickTime float64) (float64, float64) { speed := 6.0 length := tickTime * speed angle := 359 - d2helper.GetAngleBetween( v.LocationX, v.LocationY, v.TargetX, v.TargetY, ) radians := (math.Pi / 180.0) * float64(angle) oneStepX := length * math.Cos(radians) oneStepY := length * math.Sin(radians) return oneStepX, oneStepY } func (v *AnimatedEntity) Step(tickTime float64) { stepX, stepY := v.getStepLength(tickTime) if d2helper.AlmostEqual(v.LocationX, v.TargetX, stepX) { v.LocationX = v.TargetX } if d2helper.AlmostEqual(v.LocationY, v.TargetY, stepY) { v.LocationY = v.TargetY } if v.LocationX != v.TargetX { v.LocationX += stepX } if v.LocationY != v.TargetY { v.LocationY += stepY } v.subcellX = 1 + math.Mod(v.LocationX, 5) v.subcellY = 1 + math.Mod(v.LocationY, 5) v.TileX = int(v.LocationX / 5) v.TileY = int(v.LocationY / 5) if v.LocationX == v.TargetX && v.LocationY == v.TargetY { v.repetitions = 3 + rand.Intn(5) newAnimationMode := d2enum.AnimationModeObjectNeutral // TODO: Figure out what 1-3 are for, 4 is correct. switch v.action { case 1: newAnimationMode = d2enum.AnimationModeMonsterNeutral case 2: newAnimationMode = d2enum.AnimationModeMonsterNeutral case 3: newAnimationMode = d2enum.AnimationModeMonsterNeutral case 4: newAnimationMode = d2enum.AnimationModeMonsterSkill1 v.repetitions = 0 } v.composite.ResetPlayedCount() if v.animationMode != newAnimationMode.String() { v.SetMode(newAnimationMode.String(), v.weaponClass, v.direction) } } } // SetTarget sets target coordinates and changes animation based on proximity and direction func (v *AnimatedEntity) SetTarget(tx, ty float64, action int32) { angle := 359 - d2helper.GetAngleBetween( v.LocationX, v.LocationY, tx, ty, ) v.action = action // TODO: Check if is in town and if is player. newAnimationMode := d2enum.AnimationModeMonsterWalk.String() if tx != v.LocationX || ty != v.LocationY { v.TargetX, v.TargetY = tx, ty newAnimationMode = d2enum.AnimationModeMonsterWalk.String() } if newAnimationMode != v.animationMode { v.SetMode(newAnimationMode, v.weaponClass, v.direction) } newDirection := angleToDirection(float64(angle), v.composite.GetDirectionCount()) if newDirection != v.GetDirection() { v.SetMode(v.animationMode, v.weaponClass, newDirection) } } func angleToDirection(angle float64, numberOfDirections int) int { if numberOfDirections == 0 { return 0 } degreesPerDirection := 360.0 / float64(numberOfDirections) offset := 45.0 - (degreesPerDirection / 2) newDirection := int((angle - offset) / degreesPerDirection) if newDirection >= numberOfDirections { newDirection = newDirection - numberOfDirections } else if newDirection < 0 { newDirection = numberOfDirections + newDirection } return newDirection } func (v *AnimatedEntity) Advance(elapsed float64) { v.composite.Advance(elapsed) } func (v *AnimatedEntity) GetPosition() (float64, float64) { return float64(v.TileX), float64(v.TileY) }