vanishing particle test

src/net/torvald/terrarum/gameparticles/ParticleVanishingTexture.kt

@@ -0,0 +1,58 @@
+package net.torvald.terrarum.gameparticles
+
+import com.badlogic.gdx.graphics.g2d.SpriteBatch
+import com.badlogic.gdx.graphics.g2d.TextureRegion
+import net.torvald.terrarum.gameactors.Actor
+import net.torvald.terrarum.imagefont.TinyAlphNum
+
+/**
+ * @param tex image
+ * @param x x-coord of the particle's initial spawn position, bottom-centre
+ * @param y y-coord of the particle's initial spawn position, bottom-centre
+ */
+open class ParticleVanishingTexture(val tex: TextureRegion, x: Double, y: Double) : ParticleBase(Actor.RenderOrder.OVERLAY, false, 2f) {
+
+    init {
+        velocity.set(0.0, -1.0)
+        hitbox.setDimension(2.0, 2.0)
+        hitbox.setPositionFromPointed(x, y)
+
+        body = tex
+
+        isNoSubjectToGrav = true
+    }
+
+    override fun update(delta: Float) {
+        super.update(delta)
+
+        drawColour.a = (lifetimeMax - lifetimeCounter) / lifetimeMax
+    }
+}
+
+class ParticleVanishingText(val text: String, x: Double, y: Double) : ParticleBase(Actor.RenderOrder.OVERLAY, false, 2f) {
+
+    private val lines = text.split('\n')
+
+    init {
+        velocity.set(0.0, -1.0)
+
+        hitbox.setDimension(lines.maxOf { TinyAlphNum.getWidth(it) }.toDouble(), lines.size * TinyAlphNum.H.toDouble())
+        hitbox.setPositionFromPointed(x, y)
+
+        isNoSubjectToGrav = true
+    }
+
+    override fun update(delta: Float) {
+        super.update(delta)
+        drawColour.a = (lifetimeMax - lifetimeCounter) / lifetimeMax
+    }
+
+    override fun drawBody(batch: SpriteBatch) {
+        if (!flagDespawn) {
+            batch.color = drawColour
+            lines.forEachIndexed { index, line ->
+                TinyAlphNum.draw(batch, line, hitbox.startX.toFloat(), hitbox.startY.toFloat() + TinyAlphNum.H * index)
+            }
+        }
+    }
+}