Created a High-Res screenshot option to gui.

BlockMap-gui/src/main/java/de/piegames/blockmap/gui/ScreenshotHandler.java

@@ -0,0 +1,70 @@
+package de.piegames.blockmap.gui;
+
+import java.io.File;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
+
+import org.joml.AABBd;
+
+import javafx.concurrent.Task;
+import javafx.embed.swing.SwingFXUtils;
+import javafx.scene.SnapshotParameters;
+import javafx.scene.canvas.Canvas;
+import javafx.scene.canvas.GraphicsContext;
+import javafx.scene.image.Image;
+import javafx.scene.image.WritableImage;
+import javafx.scene.paint.Color;
+
+/**
+ * Handles the creation of high-resolution screenshots of maps.
+ */
+public class ScreenshotHandler {
+
+    /**
+     * Take a high-resolution screenshot of a section of them map
+     * @param map Map to use.
+     * @param frustum Bounds of the image.
+     * @return The captured image.
+     */
+    public static WritableImage takeScreenshot(RenderedMap map, AABBd frustum) {
+        double width = frustum.maxX - frustum.minX;
+        double height = frustum.maxY - frustum.minY;
+
+        Canvas canvas = new Canvas(width, height);
+        GraphicsContext gc = canvas.getGraphicsContext2D();
+        gc.translate(-frustum.minX, -frustum.minY);
+
+        map.draw(gc, 0, frustum, 1);
+
+        SnapshotParameters parameters = new SnapshotParameters();
+        parameters.setFill(Color.TRANSPARENT);
+
+        return canvas.snapshot(parameters, null);
+    }
+
+    /**
+     * Save a JavaFX image out to a file in PNG format.
+     * 
+     * @param image Image to save.
+     * @param file  File to save to.
+     * @throws IOException If an IO exception occurs while writing the file.
+     */
+    public static void saveImage(Image image, File file) throws IOException {
+        ImageIO.write(SwingFXUtils.fromFXImage(image, null), "png", file);
+    }
+
+    public static Task<Void> saveImageTask(Image image, File file) {
+        Task<Void> task = new Task<Void>() {
+
+            @Override
+            protected Void call() throws Exception {
+                saveImage(image, file);
+                return null;
+            }
+
+        };
+        return task;
+    }
+
+}

BlockMap-gui/src/main/java/de/piegames/blockmap/gui/WorldRendererCanvas.java

@@ -113,6 +113,10 @@ public void render() {
 		// gc.strokeRect(0, 0, getWidth() - 0, getHeight() - 0);
 	}
 
+	public RenderedMap getMap() {
+		return map;
+	}
+
 	public ReadOnlyMapProperty<Vector2ic, Map<Vector2ic, ChunkMetadata>> getChunkMetadata() {
 		return chunkMetadata.getReadOnlyProperty();
 	}

BlockMap-gui/src/main/java/de/piegames/blockmap/gui/standalone/GuiController.java

@@ -1,5 +1,6 @@
 package de.piegames.blockmap.gui.standalone;
 
+import java.io.File;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
@@ -12,6 +13,7 @@
 import java.util.Map;
 import java.util.ResourceBundle;
 import java.util.concurrent.Executors;
+import java.util.concurrent.ForkJoinPool;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
@@ -21,12 +23,14 @@
 import org.controlsfx.control.CheckTreeView;
 import org.controlsfx.control.StatusBar;
 import org.controlsfx.dialog.ExceptionDialog;
+import org.controlsfx.dialog.ProgressDialog;
 import org.joml.Vector2d;
 import org.joml.Vector2ic;
 
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 
 import de.piegames.blockmap.gui.MapPane;
+import de.piegames.blockmap.gui.ScreenshotHandler;
 import de.piegames.blockmap.gui.WorldRendererCanvas;
 import de.piegames.blockmap.gui.decoration.DragScrollDecoration;
 import de.piegames.blockmap.gui.decoration.GridDecoration;
@@ -49,6 +53,7 @@
 import javafx.beans.value.ChangeListener;
 import javafx.collections.FXCollections;
 import javafx.collections.MapChangeListener;
+import javafx.concurrent.Task;
 import javafx.fxml.FXML;
 import javafx.fxml.Initializable;
 import javafx.scene.control.Alert;
@@ -57,12 +62,17 @@
 import javafx.scene.control.CheckBox;
 import javafx.scene.control.CheckBoxTreeItem;
 import javafx.scene.control.Label;
+import javafx.scene.control.MenuItem;
 import javafx.scene.control.SelectionMode;
 import javafx.scene.control.TitledPane;
 import javafx.scene.control.TreeItem;
 import javafx.scene.image.ImageView;
+import javafx.scene.image.WritableImage;
 import javafx.scene.input.MouseButton;
 import javafx.scene.layout.BorderPane;
+import javafx.stage.FileChooser;
+import javafx.stage.Modality;
+import javafx.stage.FileChooser.ExtensionFilter;
 import javafx.util.Duration;
 import javafx.util.Pair;
 
@@ -111,6 +121,11 @@ static enum WorldType {
 	public CheckTreeView<PinType> pinView;
 	public Map<PinType, TreeItem<PinType>> checkedPins = new HashMap<>();
 
+	/* Menu Bar */
+	@FXML
+	protected MenuItem screenshotButton;
+
+
 	protected MapPane pane;
 	public PinDecoration pins;
 
@@ -265,6 +280,14 @@ public void initialize(URL location, ResourceBundle resources) {
 			if (change.getValueAdded() != null)
 				GuiController.this.pins.loadRegion(change.getKey(), Pin.convertDynamic(change.getValueAdded(), renderer.viewport));
 		});
+
+		regionFolder.addListener((e, old, val) -> {
+			if (val == null) {
+				screenshotButton.setDisable(true);
+			} else {
+				screenshotButton.setDisable(false);
+			}
+		});
 	}
 
 	/**
@@ -367,6 +390,32 @@ public void load(String input) {
 		alert.showAndWait();
 	}
 
+	@FXML
+	public void screenshot() {
+		WritableImage image = ScreenshotHandler.takeScreenshot(renderer.getMap(), renderer.viewport.getFrustum());
+		FileChooser fileChooser = new FileChooser();
+		fileChooser.setTitle("Save Screenshot");
+		fileChooser.getExtensionFilters().add(new ExtensionFilter("PNG Files", "*.png"));
+		File file = fileChooser.showSaveDialog(null);
+		if (file != null) {
+
+			Task<Void> task = ScreenshotHandler.saveImageTask(image, file);
+			task.setOnFailed(value -> {
+				log.error("Unable to save screenshot.", task.getException());
+				ExceptionDialog d = new ExceptionDialog(task.getException());
+				d.setTitle("Error");
+				d.setHeaderText("Unable to save screenshot.");
+				d.showAndWait();
+			});
+
+			ProgressDialog progress = new ProgressDialog(task);
+			progress.setTitle("Saving");
+			progress.setHeaderText("Saving screenshot");
+			progress.initModality(Modality.APPLICATION_MODAL);
+			ForkJoinPool.commonPool().execute(task::run);
+		}
+	}
+
 	@FXML
 	public void showLoadDialog() {
 		try {

BlockMap-gui/src/main/resources/de/piegames/blockmap/gui/standalone/scene.fxml

@@ -75,6 +75,12 @@
 								shortcut="UP" />
 						</accelerator>
 					</MenuItem>
+					<MenuItem
+						text="Screenshot"
+						onAction="#screenshot"
+						disable="true"
+						fx:id="screenshotButton">
+					</MenuItem>
 					<MenuItem
 						text="Quit"
 						onAction="#exit">