first stamina drain implementation (#778)

Bugs: 1. In D2 when Stamina is drained it does not regenerate until you completely stop
2. Stamina Bar does not get red when near the end

d2core/d2hero/hero_stats_state.go

@@ -30,8 +30,8 @@ type HeroStatsState struct {
 	PoisonResistance    int `json:"poisonResistance"`
 
 	// values which are not saved/loaded(computed)
-	Stamina      int `json:"-"` // only MaxStamina is saved, Stamina gets reset on entering world
-	NextLevelExp int `json:"-"`
+	Stamina      float64 `json:"-"` // only MaxStamina is saved, Stamina gets reset on entering world
+	NextLevelExp int     `json:"-"`
 }
 
 // CreateHeroStatsState generates a running state from a hero stats.
@@ -53,7 +53,7 @@ func (f *HeroStateFactory) CreateHeroStatsState(heroClass d2enum.Hero, classStat
 
 	result.Mana = result.MaxMana
 	result.Health = result.MaxHealth
-	result.Stamina = result.MaxStamina
+	result.Stamina = float64(result.MaxStamina)
 
 	// TODO: For demonstration purposes (hp, mana, exp, & character stats panel gets updated depending on stats)
 	result.Health = 50

d2core/d2map/d2mapentity/factory.go

@@ -77,7 +77,7 @@ func (f *MapEntityFactory) NewPlayer(id, name string, x, y, direction int, heroT
 	}
 
 	stats.NextLevelExp = f.asset.Records.GetExperienceBreakpoint(heroType, stats.Level)
-	stats.Stamina = stats.MaxStamina
+	stats.Stamina = float64(stats.MaxStamina)
 
 	defaultCharStats := f.asset.Records.Character.Stats[heroType]
 	statsState := f.HeroStateFactory.CreateHeroStatsState(heroType, defaultCharStats)
@@ -249,7 +249,7 @@ func (f *MapEntityFactory) NewCastOverlay(x, y int, overlayRecord *d2records.Ove
 	result := &CastOverlay{
 		AnimatedEntity: entity,
 		record:         overlayRecord,
-		playLoop: playLoop,
+		playLoop:       playLoop,
 	}
 
 	return result, nil

d2core/d2map/d2mapentity/player.go

@@ -2,7 +2,6 @@ package d2mapentity
 
 import (
 	"fmt"
-
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2math/d2vector"
@@ -106,6 +105,20 @@ func (p *Player) Advance(tickTime float64) {
 	if p.composite.GetAnimationMode() != p.animationMode {
 		p.animationMode = p.composite.GetAnimationMode()
 	}
+
+	// Drain and regenerate Stamina
+	if p.IsRunning() && !p.atTarget() && !p.IsInTown() {
+		p.Stats.Stamina -= float64(p.composite.AssetManager.Records.Character.Stats[p.Class].StaminaRunDrain) * tickTime / 5
+		if p.Stats.Stamina < 0 {
+			p.SetSpeed(baseWalkSpeed)
+			p.Stats.Stamina = 0
+		}
+	} else if p.Stats.Stamina < float64(p.Stats.MaxStamina) {
+		p.Stats.Stamina += float64(p.composite.AssetManager.Records.Character.Stats[p.Class].StaminaRunDrain) * tickTime / 5
+		if p.IsRunning() {
+			p.SetSpeed(baseRunSpeed)
+		}
+	}
 }
 
 // Render renders the animated composite for this entity.

d2game/d2player/hero_stats_panel.go

@@ -341,7 +341,7 @@ func (s *HeroStatsPanel) initStatValueLabels() {
 	s.labels.Energy = s.createStatValueLabel(s.heroState.Energy, 175, 355)
 
 	s.labels.MaxStamina = s.createStatValueLabel(s.heroState.MaxStamina, 330, 295)
-	s.labels.Stamina = s.createStatValueLabel(s.heroState.Stamina, 370, 295)
+	s.labels.Stamina = s.createStatValueLabel(int(s.heroState.Stamina), 370, 295)
 
 	s.labels.MaxHealth = s.createStatValueLabel(s.heroState.MaxHealth, 330, 320)
 	s.labels.Health = s.createStatValueLabel(s.heroState.Health, 370, 320)
@@ -364,7 +364,7 @@ func (s *HeroStatsPanel) renderStatValues(target d2interface.Surface) {
 	s.renderStatValueNum(s.labels.Health, s.heroState.Health, target)
 
 	s.renderStatValueNum(s.labels.MaxStamina, s.heroState.MaxStamina, target)
-	s.renderStatValueNum(s.labels.Stamina, s.heroState.Stamina, target)
+	s.renderStatValueNum(s.labels.Stamina, int(s.heroState.Stamina), target)
 
 	s.renderStatValueNum(s.labels.MaxMana, s.heroState.MaxMana, target)
 	s.renderStatValueNum(s.labels.Mana, s.heroState.Mana, target)