diff --git a/playground/kotlin-implementation/.gitignore b/playground/kotlin-implementation/.gitignore
new file mode 100644
index 00000000..603b1407
--- /dev/null
+++ b/playground/kotlin-implementation/.gitignore
@@ -0,0 +1,14 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
diff --git a/playground/kotlin-implementation/.idea/codeStyles/Project.xml b/playground/kotlin-implementation/.idea/codeStyles/Project.xml
new file mode 100644
index 00000000..88ea3aa1
--- /dev/null
+++ b/playground/kotlin-implementation/.idea/codeStyles/Project.xml
@@ -0,0 +1,122 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ xmlns:android
+
+ ^$
+
+
+
+
+
+
+
+
+ xmlns:.*
+
+ ^$
+
+
+ BY_NAME
+
+
+
+
+
+
+ .*:id
+
+ http://schemas.android.com/apk/res/android
+
+
+
+
+
+
+
+
+ .*:name
+
+ http://schemas.android.com/apk/res/android
+
+
+
+
+
+
+
+
+ name
+
+ ^$
+
+
+
+
+
+
+
+
+ style
+
+ ^$
+
+
+
+
+
+
+
+
+ .*
+
+ ^$
+
+
+ BY_NAME
+
+
+
+
+
+
+ .*
+
+ http://schemas.android.com/apk/res/android
+
+
+ ANDROID_ATTRIBUTE_ORDER
+
+
+
+
+
+
+ .*
+
+ .*
+
+
+ BY_NAME
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/playground/kotlin-implementation/.idea/codeStyles/codeStyleConfig.xml b/playground/kotlin-implementation/.idea/codeStyles/codeStyleConfig.xml
new file mode 100644
index 00000000..79ee123c
--- /dev/null
+++ b/playground/kotlin-implementation/.idea/codeStyles/codeStyleConfig.xml
@@ -0,0 +1,5 @@
+
+
+
+
+
\ No newline at end of file
diff --git a/playground/kotlin-implementation/.idea/gradle.xml b/playground/kotlin-implementation/.idea/gradle.xml
new file mode 100644
index 00000000..5cd135a0
--- /dev/null
+++ b/playground/kotlin-implementation/.idea/gradle.xml
@@ -0,0 +1,20 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/playground/kotlin-implementation/.idea/misc.xml b/playground/kotlin-implementation/.idea/misc.xml
new file mode 100644
index 00000000..37a75096
--- /dev/null
+++ b/playground/kotlin-implementation/.idea/misc.xml
@@ -0,0 +1,9 @@
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/playground/kotlin-implementation/.idea/runConfigurations.xml b/playground/kotlin-implementation/.idea/runConfigurations.xml
new file mode 100644
index 00000000..7f68460d
--- /dev/null
+++ b/playground/kotlin-implementation/.idea/runConfigurations.xml
@@ -0,0 +1,12 @@
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/playground/kotlin-implementation/README.md b/playground/kotlin-implementation/README.md
new file mode 100644
index 00000000..df9bc06b
--- /dev/null
+++ b/playground/kotlin-implementation/README.md
@@ -0,0 +1,23 @@
+
+
+
+ Doom Fire Algorithm
+
+
+
+
+
+
+
+
+
+▶️ [Click here for the Video tutorial](https://www.youtube.com/watch?v=HCjDjsHPOco)
+
+📄 This project was inspired by [this article](http://fabiensanglard.net/doom_fire_psx/).
+
+## Author
+
diff --git a/playground/kotlin-implementation/app/.gitignore b/playground/kotlin-implementation/app/.gitignore
new file mode 100644
index 00000000..796b96d1
--- /dev/null
+++ b/playground/kotlin-implementation/app/.gitignore
@@ -0,0 +1 @@
+/build
diff --git a/playground/kotlin-implementation/app/build.gradle b/playground/kotlin-implementation/app/build.gradle
new file mode 100644
index 00000000..2d71a660
--- /dev/null
+++ b/playground/kotlin-implementation/app/build.gradle
@@ -0,0 +1,37 @@
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+
+android {
+ compileSdkVersion 29
+ buildToolsVersion "29.0.2"
+
+ defaultConfig {
+ applicationId "com.biachacon.doomfire"
+ minSdkVersion 16
+ targetSdkVersion 29
+ versionCode 1
+ versionName "1.0"
+
+ testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+ }
+
+ buildTypes {
+ release {
+ minifyEnabled false
+ proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+ }
+ }
+
+}
+
+dependencies {
+ implementation fileTree(dir: 'libs', include: ['*.jar'])
+ implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+ implementation 'androidx.appcompat:appcompat:1.1.0'
+ implementation 'androidx.core:core-ktx:1.2.0'
+ implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+ testImplementation 'junit:junit:4.12'
+ androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+ androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+}
diff --git a/playground/kotlin-implementation/app/proguard-rules.pro b/playground/kotlin-implementation/app/proguard-rules.pro
new file mode 100644
index 00000000..f1b42451
--- /dev/null
+++ b/playground/kotlin-implementation/app/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+# http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+# public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
diff --git a/playground/kotlin-implementation/app/src/androidTest/java/com/biachacon/doomfire/ExampleInstrumentedTest.kt b/playground/kotlin-implementation/app/src/androidTest/java/com/biachacon/doomfire/ExampleInstrumentedTest.kt
new file mode 100644
index 00000000..30fd7f72
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/androidTest/java/com/biachacon/doomfire/ExampleInstrumentedTest.kt
@@ -0,0 +1,24 @@
+package com.biachacon.doomfire
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+ @Test
+ fun useAppContext() {
+ // Context of the app under test.
+ val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+ assertEquals("com.biachacon.doomfire", appContext.packageName)
+ }
+}
diff --git a/playground/kotlin-implementation/app/src/main/AndroidManifest.xml b/playground/kotlin-implementation/app/src/main/AndroidManifest.xml
new file mode 100644
index 00000000..54be42b1
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/AndroidManifest.xml
@@ -0,0 +1,21 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/playground/kotlin-implementation/app/src/main/java/com/biachacon/doomfire/Fire.kt b/playground/kotlin-implementation/app/src/main/java/com/biachacon/doomfire/Fire.kt
new file mode 100644
index 00000000..ec61e84c
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/java/com/biachacon/doomfire/Fire.kt
@@ -0,0 +1,175 @@
+package com.biachacon.doomfire
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
+import android.util.AttributeSet
+import android.view.View
+import java.util.*
+import kotlin.math.absoluteValue
+
+class Fire(context: Context, attributeSet: AttributeSet) : View(context, attributeSet) {
+
+ private val resolution = 480
+ private var widthMode: Int = 0
+ private var widthSize: Int = 0
+ private var heightMode: Int = 0
+ private var heightSize: Int = 0
+ private var widthPixel: Int = 0
+ private var heightPixel: Int = 0
+ private var pixelSize: Int = 0
+ private var windDirection: Int = 0
+ private lateinit var fireArray: IntArray
+ private val fireColors = arrayOf(
+ Paint().apply { color = Color.rgb(7, 7, 7) },
+ Paint().apply { color = Color.rgb(31, 7, 7) },
+ Paint().apply { color = Color.rgb(47, 15, 7) },
+ Paint().apply { color = Color.rgb(71, 15, 7) },
+ Paint().apply { color = Color.rgb(87, 23, 7) },
+ Paint().apply { color = Color.rgb(103, 31, 7) },
+ Paint().apply { color = Color.rgb(119, 31, 7) },
+ Paint().apply { color = Color.rgb(143, 39, 7) },
+ Paint().apply { color = Color.rgb(159, 47, 7) },
+ Paint().apply { color = Color.rgb(175, 63, 7) },
+ Paint().apply { color = Color.rgb(191, 71, 7) },
+ Paint().apply { color = Color.rgb(199, 71, 7) },
+ Paint().apply { color = Color.rgb(223, 79, 7) },
+ Paint().apply { color = Color.rgb(223, 87, 7) },
+ Paint().apply { color = Color.rgb(223, 87, 7) },
+ Paint().apply { color = Color.rgb(215, 95, 7) },
+ Paint().apply { color = Color.rgb(215, 95, 7) },
+ Paint().apply { color = Color.rgb(215, 95, 7) },
+ Paint().apply { color = Color.rgb(215, 103, 15) },
+ Paint().apply { color = Color.rgb(207, 111, 15) },
+ Paint().apply { color = Color.rgb(207, 119, 15) },
+ Paint().apply { color = Color.rgb(207, 127, 15) },
+ Paint().apply { color = Color.rgb(207, 135, 23) },
+ Paint().apply { color = Color.rgb(199, 135, 23) },
+ Paint().apply { color = Color.rgb(199, 143, 23) },
+ Paint().apply { color = Color.rgb(199, 151, 31) },
+ Paint().apply { color = Color.rgb(191, 159, 31) },
+ Paint().apply { color = Color.rgb(191, 159, 31) },
+ Paint().apply { color = Color.rgb(191, 167, 39) },
+ Paint().apply { color = Color.rgb(191, 167, 39) },
+ Paint().apply { color = Color.rgb(191, 175, 47) },
+ Paint().apply { color = Color.rgb(183, 175, 47) },
+ Paint().apply { color = Color.rgb(183, 183, 47) },
+ Paint().apply { color = Color.rgb(183, 183, 55) },
+ Paint().apply { color = Color.rgb(207, 207, 111) },
+ Paint().apply { color = Color.rgb(223, 223, 159) },
+ Paint().apply { color = Color.rgb(239, 239, 199) },
+ Paint().apply { color = Color.rgb(255, 255, 255) }
+ )
+
+ init {
+ with(context.obtainStyledAttributes(attributeSet, R.styleable.DoomFlamesWidget)) {
+ windDirection = getInt(R.styleable.DoomFlamesWidget_wind, 0)
+ }
+ }
+
+ override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+ super.onMeasure(widthMeasureSpec, heightMeasureSpec)
+ widthMode = MeasureSpec.getMode(widthMeasureSpec)
+ widthSize = MeasureSpec.getSize(widthMeasureSpec)
+ heightMode = MeasureSpec.getMode(heightMeasureSpec)
+ heightSize = MeasureSpec.getSize(heightMeasureSpec)
+ initializeFireArray()
+ createFireSource()
+ }
+
+ private fun getWidthCalculated(): Int {
+ return when (widthMode) {
+ MeasureSpec.EXACTLY -> widthSize
+ MeasureSpec.AT_MOST -> Math.min(resolution, widthSize)
+ else -> resolution
+ }
+ }
+
+ private fun getHeightCalculated(): Int {
+ return when (heightMode) {
+ MeasureSpec.EXACTLY -> heightSize
+ MeasureSpec.AT_MOST -> Math.min(resolution, heightPixel)
+ else -> resolution
+ }
+ }
+
+ private fun initializeFireArray() {
+ val heightIsBigger = getWidthCalculated() < getHeightCalculated()
+ val biggestSize = if (heightIsBigger) getWidthCalculated().toDouble() else getHeightCalculated().toDouble()
+ pixelSize = Math.ceil( biggestSize / 50).toInt()
+ widthPixel = if (heightIsBigger) 50 else Math.ceil(getWidthCalculated().toDouble()/pixelSize).toInt()
+ heightPixel = if (!heightIsBigger) 50 else Math.ceil(getHeightCalculated().toDouble()/pixelSize).toInt()
+ val arraySize = widthPixel * heightPixel
+ fireArray = IntArray(arraySize.absoluteValue)
+ fireArray.forEachIndexed { index, _ -> fireArray[index] = 0 }
+ }
+
+ fun setFireIntensity(int: Int){
+ createFireSource(int)
+ invalidate()
+ }
+
+ private fun createFireSource(firePower: Int = 36) {
+ val overFlowFireIndex = widthPixel * heightPixel
+
+ for (column in 0 until widthPixel) {
+ val pixelIndex = (overFlowFireIndex - widthPixel) + column
+ fireArray[pixelIndex] = firePower
+ }
+ }
+
+ private fun calculateFirePropagation() {
+ for (column in 0 until widthPixel) {
+ for (row in 0 until heightPixel) {
+ updateFireIntensityPerPixel(column + (widthPixel * row))
+ }
+ }
+ }
+
+ private fun updateFireIntensityPerPixel(currentPixelIndex: Int) {
+ val bellowPixelIndex = currentPixelIndex + widthPixel
+ if (bellowPixelIndex >= widthPixel * heightPixel) return
+
+ val heightIsBigger = getWidthCalculated() < getHeightCalculated()
+ val decay = Math.floor(Random().nextDouble() * if (heightIsBigger)2 else 3).toInt()
+ val bellowPixelFireIntensity = fireArray[bellowPixelIndex]
+ val newFireIntensity = if (bellowPixelFireIntensity - decay >= 0) bellowPixelFireIntensity - decay else 0
+ val pos = when(windDirection){
+ 1 -> if (currentPixelIndex - decay >= 0) currentPixelIndex - decay else currentPixelIndex
+ 2 -> if (currentPixelIndex + decay >= 0) currentPixelIndex + decay else currentPixelIndex
+ else -> currentPixelIndex
+ }
+ fireArray[pos] = newFireIntensity
+ }
+
+ private fun renderFire(canvas: Canvas) {
+ for (row in 0 until heightPixel) {
+ for (column in 0 until widthPixel) {
+ canvas.drawRect(
+ (column * pixelSize).toFloat(),
+ (row * pixelSize).toFloat(),
+ ((column + 1) * pixelSize).toFloat(),
+ ((row + 1) * pixelSize).toFloat(),
+ fireColors[fireArray[column + (widthPixel * row)]]
+ )
+ }
+ }
+ }
+
+ override fun onDraw(canvas: Canvas?) {
+ super.onDraw(canvas)
+ calculateFirePropagation()
+ canvas?.let { renderFire(it) }
+ postInvalidateDelayed(13)
+ }
+
+ enum class WindDirection(val value:Int){
+ RIGHT(2), LEFT(1), NONE(0)
+ }
+
+ fun setWind(direction: WindDirection){
+ windDirection = direction.value
+ }
+
+}
\ No newline at end of file
diff --git a/playground/kotlin-implementation/app/src/main/java/com/biachacon/doomfire/MainActivity.kt b/playground/kotlin-implementation/app/src/main/java/com/biachacon/doomfire/MainActivity.kt
new file mode 100644
index 00000000..d5e3c189
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/java/com/biachacon/doomfire/MainActivity.kt
@@ -0,0 +1,56 @@
+package com.biachacon.doomfire
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import kotlinx.android.synthetic.main.activity_main.*
+
+class MainActivity : AppCompatActivity() {
+
+ var f = 9;
+
+ override fun onCreate(savedInstanceState: Bundle?) {
+ super.onCreate(savedInstanceState)
+ setContentView(R.layout.activity_main)
+ setOnClickListeners()
+ }
+
+ private fun setOnClickListeners() {
+
+ maxBt.setOnClickListener {
+ f = 9
+ fire.setFireIntensity(f*4)
+ }
+
+ minBt.setOnClickListener {
+ f = 1
+ fire.setFireIntensity(f*4)
+ }
+
+ downBt.setOnClickListener {
+ if (f>1) {
+ f--
+ }
+
+ fire.setFireIntensity(f*4)
+ }
+
+ upBt.setOnClickListener {
+ if (f<9) {
+ f++
+ }
+ fire.setFireIntensity(f*4)
+ }
+
+ noneBt.setOnClickListener {
+ fire.setWind(Fire.WindDirection.NONE)
+ }
+
+ leftBt.setOnClickListener {
+ fire.setWind(Fire.WindDirection.LEFT)
+ }
+
+ rightBt.setOnClickListener {
+ fire.setWind(Fire.WindDirection.RIGHT)
+ }
+ }
+}
\ No newline at end of file
diff --git a/playground/kotlin-implementation/app/src/main/res/drawable-v24/bt_background.xml b/playground/kotlin-implementation/app/src/main/res/drawable-v24/bt_background.xml
new file mode 100644
index 00000000..1e119f3c
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/res/drawable-v24/bt_background.xml
@@ -0,0 +1,8 @@
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/playground/kotlin-implementation/app/src/main/res/drawable-v24/down.png b/playground/kotlin-implementation/app/src/main/res/drawable-v24/down.png
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diff --git a/playground/kotlin-implementation/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/playground/kotlin-implementation/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
new file mode 100644
index 00000000..2b068d11
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -0,0 +1,30 @@
+
+
+
+
+
+
+
+
+
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\ No newline at end of file
diff --git a/playground/kotlin-implementation/app/src/main/res/drawable-v24/left.png b/playground/kotlin-implementation/app/src/main/res/drawable-v24/left.png
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diff --git a/playground/kotlin-implementation/app/src/main/res/drawable-v24/minus.png b/playground/kotlin-implementation/app/src/main/res/drawable-v24/minus.png
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diff --git a/playground/kotlin-implementation/app/src/main/res/drawable-v24/rigth.png b/playground/kotlin-implementation/app/src/main/res/drawable-v24/rigth.png
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new file mode 100644
index 00000000..d6bcae31
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diff --git a/playground/kotlin-implementation/app/src/main/res/drawable/circle.png b/playground/kotlin-implementation/app/src/main/res/drawable/circle.png
new file mode 100644
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diff --git a/playground/kotlin-implementation/app/src/main/res/drawable/ic_launcher_background.xml b/playground/kotlin-implementation/app/src/main/res/drawable/ic_launcher_background.xml
new file mode 100644
index 00000000..07d5da9c
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/res/drawable/ic_launcher_background.xml
@@ -0,0 +1,170 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/playground/kotlin-implementation/app/src/main/res/layout/activity_main.xml b/playground/kotlin-implementation/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 00000000..7c781f7e
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,147 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/playground/kotlin-implementation/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
new file mode 100644
index 00000000..eca70cfe
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -0,0 +1,5 @@
+
+
+
+
+
\ No newline at end of file
diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/playground/kotlin-implementation/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
new file mode 100644
index 00000000..eca70cfe
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -0,0 +1,5 @@
+
+
+
+
+
\ No newline at end of file
diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-hdpi/ic_launcher.png b/playground/kotlin-implementation/app/src/main/res/mipmap-hdpi/ic_launcher.png
new file mode 100644
index 00000000..a571e600
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diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-hdpi/ic_launcher_round.png b/playground/kotlin-implementation/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
new file mode 100644
index 00000000..61da551c
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diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-mdpi/ic_launcher.png b/playground/kotlin-implementation/app/src/main/res/mipmap-mdpi/ic_launcher.png
new file mode 100644
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diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-mdpi/ic_launcher_round.png b/playground/kotlin-implementation/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
new file mode 100644
index 00000000..db5080a7
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diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/playground/kotlin-implementation/app/src/main/res/mipmap-xhdpi/ic_launcher.png
new file mode 100644
index 00000000..6dba46da
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diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png b/playground/kotlin-implementation/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
new file mode 100644
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diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/playground/kotlin-implementation/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
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diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png b/playground/kotlin-implementation/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
new file mode 100644
index 00000000..b216f2d3
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diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png b/playground/kotlin-implementation/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
new file mode 100644
index 00000000..f25a4197
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diff --git a/playground/kotlin-implementation/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png b/playground/kotlin-implementation/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
new file mode 100644
index 00000000..e96783cc
Binary files /dev/null and b/playground/kotlin-implementation/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png differ
diff --git a/playground/kotlin-implementation/app/src/main/res/values/attrs.xml b/playground/kotlin-implementation/app/src/main/res/values/attrs.xml
new file mode 100644
index 00000000..d1c968de
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/res/values/attrs.xml
@@ -0,0 +1,10 @@
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/playground/kotlin-implementation/app/src/main/res/values/colors.xml b/playground/kotlin-implementation/app/src/main/res/values/colors.xml
new file mode 100644
index 00000000..69295f87
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/res/values/colors.xml
@@ -0,0 +1,10 @@
+
+
+ #6200ee
+ #3700b3
+ #D81B60
+ #000
+ #000
+ #ffff
+
+
diff --git a/playground/kotlin-implementation/app/src/main/res/values/strings.xml b/playground/kotlin-implementation/app/src/main/res/values/strings.xml
new file mode 100644
index 00000000..d65979f1
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/res/values/strings.xml
@@ -0,0 +1,3 @@
+
+ Doom Fire
+
diff --git a/playground/kotlin-implementation/app/src/main/res/values/styles.xml b/playground/kotlin-implementation/app/src/main/res/values/styles.xml
new file mode 100644
index 00000000..bc6a7214
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/main/res/values/styles.xml
@@ -0,0 +1,11 @@
+
+
+
+
+
+
diff --git a/playground/kotlin-implementation/app/src/test/java/com/biachacon/doomfire/ExampleUnitTest.kt b/playground/kotlin-implementation/app/src/test/java/com/biachacon/doomfire/ExampleUnitTest.kt
new file mode 100644
index 00000000..d0ddeb27
--- /dev/null
+++ b/playground/kotlin-implementation/app/src/test/java/com/biachacon/doomfire/ExampleUnitTest.kt
@@ -0,0 +1,17 @@
+package com.biachacon.doomfire
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+ @Test
+ fun addition_isCorrect() {
+ assertEquals(4, 2 + 2)
+ }
+}
diff --git a/playground/kotlin-implementation/build.gradle b/playground/kotlin-implementation/build.gradle
new file mode 100644
index 00000000..a967444a
--- /dev/null
+++ b/playground/kotlin-implementation/build.gradle
@@ -0,0 +1,29 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+ ext.kotlin_version = '1.3.70'
+ repositories {
+ google()
+ jcenter()
+
+ }
+ dependencies {
+ classpath 'com.android.tools.build:gradle:3.6.1'
+ classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+
+ // NOTE: Do not place your application dependencies here; they belong
+ // in the individual module build.gradle files
+ }
+}
+
+allprojects {
+ repositories {
+ google()
+ jcenter()
+
+ }
+}
+
+task clean(type: Delete) {
+ delete rootProject.buildDir
+}
diff --git a/playground/kotlin-implementation/gradle.properties b/playground/kotlin-implementation/gradle.properties
new file mode 100644
index 00000000..23339e0d
--- /dev/null
+++ b/playground/kotlin-implementation/gradle.properties
@@ -0,0 +1,21 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx1536m
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official
diff --git a/playground/kotlin-implementation/gradle/wrapper/gradle-wrapper.jar b/playground/kotlin-implementation/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 00000000..f6b961fd
Binary files /dev/null and b/playground/kotlin-implementation/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/playground/kotlin-implementation/gradle/wrapper/gradle-wrapper.properties b/playground/kotlin-implementation/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 00000000..468f0545
--- /dev/null
+++ b/playground/kotlin-implementation/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Sun Mar 29 15:54:51 BRT 2020
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip
diff --git a/playground/kotlin-implementation/gradlew b/playground/kotlin-implementation/gradlew
new file mode 100755
index 00000000..cccdd3d5
--- /dev/null
+++ b/playground/kotlin-implementation/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+## Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+ ls=`ls -ld "$PRG"`
+ link=`expr "$ls" : '.*-> \(.*\)$'`
+ if expr "$link" : '/.*' > /dev/null; then
+ PRG="$link"
+ else
+ PRG=`dirname "$PRG"`"/$link"
+ fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+ echo "$*"
+}
+
+die () {
+ echo
+ echo "$*"
+ echo
+ exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+ CYGWIN* )
+ cygwin=true
+ ;;
+ Darwin* )
+ darwin=true
+ ;;
+ MINGW* )
+ msys=true
+ ;;
+ NONSTOP* )
+ nonstop=true
+ ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+ if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+ # IBM's JDK on AIX uses strange locations for the executables
+ JAVACMD="$JAVA_HOME/jre/sh/java"
+ else
+ JAVACMD="$JAVA_HOME/bin/java"
+ fi
+ if [ ! -x "$JAVACMD" ] ; then
+ die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+ fi
+else
+ JAVACMD="java"
+ which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+ MAX_FD_LIMIT=`ulimit -H -n`
+ if [ $? -eq 0 ] ; then
+ if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+ MAX_FD="$MAX_FD_LIMIT"
+ fi
+ ulimit -n $MAX_FD
+ if [ $? -ne 0 ] ; then
+ warn "Could not set maximum file descriptor limit: $MAX_FD"
+ fi
+ else
+ warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+ fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+ GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+ APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+ CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+ JAVACMD=`cygpath --unix "$JAVACMD"`
+
+ # We build the pattern for arguments to be converted via cygpath
+ ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+ SEP=""
+ for dir in $ROOTDIRSRAW ; do
+ ROOTDIRS="$ROOTDIRS$SEP$dir"
+ SEP="|"
+ done
+ OURCYGPATTERN="(^($ROOTDIRS))"
+ # Add a user-defined pattern to the cygpath arguments
+ if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+ OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+ fi
+ # Now convert the arguments - kludge to limit ourselves to /bin/sh
+ i=0
+ for arg in "$@" ; do
+ CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+ CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
+
+ if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
+ eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+ else
+ eval `echo args$i`="\"$arg\""
+ fi
+ i=$((i+1))
+ done
+ case $i in
+ (0) set -- ;;
+ (1) set -- "$args0" ;;
+ (2) set -- "$args0" "$args1" ;;
+ (3) set -- "$args0" "$args1" "$args2" ;;
+ (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+ (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+ (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+ (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+ (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+ (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+ esac
+fi
+
+# Escape application args
+save () {
+ for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+ echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+ cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/playground/kotlin-implementation/gradlew.bat b/playground/kotlin-implementation/gradlew.bat
new file mode 100644
index 00000000..f9553162
--- /dev/null
+++ b/playground/kotlin-implementation/gradlew.bat
@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/playground/kotlin-implementation/settings.gradle b/playground/kotlin-implementation/settings.gradle
new file mode 100644
index 00000000..01ee8ce3
--- /dev/null
+++ b/playground/kotlin-implementation/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name='DoomFire'
+include ':app'