up3

server/entity/effect/slowness.go

@@ -0,0 +1,41 @@
+package effect
+
+import (
+	"github.com/df-mc/dragonfly/server/world"
+	"image/color"
+)
+
+// Slowness is a lasting effect that decreases the movement speed of a living
+// entity by 15% for each level that the effect has.
+var Slowness slowness
+
+type slowness struct {
+	nopLasting
+}
+
+// Start ...
+func (slowness) Start(e world.Entity, lvl int) {
+	slowness := 1 - float64(lvl)*0.15
+	if slowness <= 0 {
+		slowness = 0.00001
+	}
+	if l, ok := e.(living); ok {
+		l.SetSpeed(l.Speed() * slowness)
+	}
+}
+
+// End ...
+func (slowness) End(e world.Entity, lvl int) {
+	slowness := 1 - float64(lvl)*0.15
+	if slowness <= 0 {
+		slowness = 0.00001
+	}
+	if l, ok := e.(living); ok {
+		l.SetSpeed(l.Speed() / slowness)
+	}
+}
+
+// RGBA ...
+func (slowness) RGBA() color.RGBA {
+	return color.RGBA{R: 0x8b, G: 0xaf, B: 0xe0, A: 0xff}
+}