Add virtual full HD screen

app/build.gradle

@@ -11,6 +11,7 @@ repositories {
 
 dependencies {
     compileOnly 'org.projectlombok:lombok:1.16.18'
+    testCompileOnly 'org.projectlombok:lombok:1.16.18'
     testRuntime 'org.junit.platform:junit-platform-launcher:1.0.0-RC2'
     testRuntime 'org.junit.jupiter:junit-jupiter-engine:5.0.0-RC2'
     testRuntime 'org.junit.vintage:junit-vintage-engine:4.12.0-RC2'

app/src/main/java/com/annimon/hotarufx/Main.java

@@ -1,9 +1,11 @@
 package com.annimon.hotarufx;
 
 import com.annimon.hotarufx.visual.Composition;
+import com.annimon.hotarufx.visual.objects.CircleNode;
 import javafx.application.Application;
 import javafx.scene.Group;
 import javafx.scene.paint.Color;
+import javafx.scene.paint.Paint;
 import javafx.stage.Stage;
 import lombok.val;
 
@@ -13,6 +15,21 @@ public class Main extends Application {
     public void start(Stage primaryStage) {
         val group = new Group();
         val composition = new Composition(1280, 720, Color.WHITE, group);
+
+        val colors = new Paint[] {Color.GREEN, Color.RED};
+        val halfWidth = composition.getVirtualWidth() / 2;
+        val halfHeight = composition.getVirtualHeight() / 2;
+        for (int y = -1; y <= 1; y++) {
+            for (int x = -1; x <= 1; x++) {
+                val circle = new CircleNode();
+                circle.getCircle().setFill(colors[Math.abs(x * y)]);
+                circle.getCircle().setCenterX(x * halfWidth);
+                circle.getCircle().setCenterY(y * halfHeight);
+                circle.getCircle().setRadius(50);
+                circle.render(composition);
+            }
+        }
+
         primaryStage.setTitle("HotaruFX");
         primaryStage.setScene(composition.getScene());
         primaryStage.show();

app/src/main/java/com/annimon/hotarufx/visual/Composition.java

@@ -15,13 +15,24 @@ public class Composition {
     private final Scene scene;
 
     @Getter
-    private final int width, height;
+    private final int
+            virtualWidth, virtualHeight,
+            sceneWidth, sceneHeight;
+    @Getter
+    private final double factor;
 
-    public Composition(int width, int height, Paint background, Group group) {
+    public Composition(int sceneWidth, int sceneHeight, Paint background, Group group) {
-        this.width = width;
+        this.sceneWidth = sceneWidth;
-        this.height = height;
+        this.sceneHeight = sceneHeight;
+        virtualHeight = 1080;
+        factor = virtualHeight / (double) sceneHeight;
+        virtualWidth = (int) (sceneWidth * factor);
+        group.setScaleX(1d / factor);
+        group.setScaleY(1d / factor);
+        group.setTranslateX(sceneWidth / 2);
+        group.setTranslateY(sceneHeight / 2);
         this.group = group;
-        this.scene = new Scene(group, width, height, background);
+        this.scene = new Scene(group, sceneWidth, sceneHeight, background);
     }
 
     public void add(Node node) {

app/src/test/java/com/annimon/hotarufx/visual/CompositionTest.java

@@ -0,0 +1,21 @@
+package com.annimon.hotarufx.visual;
+
+import javafx.scene.Group;
+import javafx.scene.paint.Color;
+import org.junit.jupiter.api.Test;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.junit.jupiter.api.Assertions.*;
+
+class CompositionTest {
+
+    @Test
+    void testVirtualSize() {
+        Composition composition;
+        composition = new Composition(1280, 720, Color.WHITE, new Group());
+        assertThat(composition.getVirtualWidth(), is(1920));
+
+        composition = new Composition(1280, 1280, Color.WHITE, new Group());
+        assertThat(composition.getVirtualWidth(), is(1080));
+    }
+}