add blink effect when player takes damage

Quillraven · Mar 31, 2024 · 28246aa · 28246aa
1 parent 0273a67
commit 28246aa
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Showing 4 changed files with 51 additions and 5 deletions.
diff --git a/core/src/main/kotlin/com/quillraven/github/quillyjumper/component/Blink.kt b/core/src/main/kotlin/com/quillraven/github/quillyjumper/component/Blink.kt
@@ -0,0 +1,14 @@
+package com.quillraven.github.quillyjumper.component
+
+import com.github.quillraven.fleks.Component
+import com.github.quillraven.fleks.ComponentType
+
+data class Blink(
+    var maxTime: Float,
+    val blinkRatio: Float, // amount in seconds after a blink is happening
+    var timer: Float = 0f,
+) : Component<Blink> {
+    override fun type() = Blink
+
+    companion object : ComponentType<Blink>()
+}
diff --git a/core/src/main/kotlin/com/quillraven/github/quillyjumper/screen/GameScreen.kt b/core/src/main/kotlin/com/quillraven/github/quillyjumper/screen/GameScreen.kt
@@ -111,6 +111,7 @@ class GameScreen(
             add(StateSystem())
             add(AnimationSystem())
             add(CameraSystem())
+            add(BlinkSystem())
             add(RenderSystem())
             if (gameProperties.debugPhysic) {
                 add(PhysicRenderDebugSystem())

diff --git a/core/src/main/kotlin/com/quillraven/github/quillyjumper/system/BlinkSystem.kt b/core/src/main/kotlin/com/quillraven/github/quillyjumper/system/BlinkSystem.kt
@@ -0,0 +1,31 @@
+package com.quillraven.github.quillyjumper.system
+
+import com.github.quillraven.fleks.Entity
+import com.github.quillraven.fleks.IteratingSystem
+import com.github.quillraven.fleks.World.Companion.family
+import com.quillraven.github.quillyjumper.component.Blink
+import com.quillraven.github.quillyjumper.component.Graphic
+
+class BlinkSystem : IteratingSystem(family { all(Blink, Graphic) }) {
+
+    override fun onTickEntity(entity: Entity) {
+        val blinkCmp = entity[Blink]
+        val (maxTime, blinkRatio) = blinkCmp
+        val (sprite) = entity[Graphic]
+
+        if (maxTime <= 0f) {
+            // blinking is done -> remove it
+            sprite.setAlpha(1f)
+            entity.configure { it -= Blink }
+            return
+        }
+
+        blinkCmp.maxTime -= deltaTime
+        blinkCmp.timer += deltaTime
+        if (blinkCmp.timer >= blinkRatio) {
+            blinkCmp.timer = 0f
+            sprite.setAlpha(if (sprite.color.a == 0f) 1f else 0f)
+        }
+    }
+
+}
diff --git a/core/src/main/kotlin/com/quillraven/github/quillyjumper/system/DamageSystem.kt b/core/src/main/kotlin/com/quillraven/github/quillyjumper/system/DamageSystem.kt
@@ -6,10 +6,7 @@ import com.github.quillraven.fleks.World.Companion.family
 import com.github.quillraven.fleks.World.Companion.inject
 import com.quillraven.github.quillyjumper.SoundAsset
 import com.quillraven.github.quillyjumper.audio.AudioService
-import com.quillraven.github.quillyjumper.component.DamageTaken
-import com.quillraven.github.quillyjumper.component.EntityTag
-import com.quillraven.github.quillyjumper.component.Invulnerable
-import com.quillraven.github.quillyjumper.component.Life
+import com.quillraven.github.quillyjumper.component.*
 import com.quillraven.github.quillyjumper.event.EntityDamageEvent
 import com.quillraven.github.quillyjumper.event.GameEventDispatcher
 import ktx.log.logger
@@ -28,7 +25,10 @@ class DamageSystem(
 
         if (entity has EntityTag.PLAYER) {
             // player becomes invulnerable after taking damage
-            entity.configure { it += Invulnerable(1.5f) }
+            entity.configure {
+                it += Invulnerable(1.5f)
+                it += Blink(maxTime = 1.5f, blinkRatio = 0.2f)
+            }
         }
     }