add lab 3 Roman Charniauski

lab-03/src/by/Roman197619/paint/DrawingApp.java

@@ -0,0 +1,193 @@
+package by.Roman197619.paint;
+
+import com.sun.javafx.binding.DoubleConstant;
+import javafx.application.Application;
+import javafx.event.EventHandler;
+import javafx.geometry.Orientation;
+import javafx.scene.Scene;
+import javafx.scene.canvas.Canvas;
+import javafx.scene.canvas.GraphicsContext;
+import javafx.scene.control.*;
+import javafx.scene.input.MouseEvent;
+import javafx.scene.layout.GridPane;
+import javafx.scene.layout.HBox;
+import javafx.scene.layout.StackPane;
+import javafx.scene.layout.VBox;
+import javafx.scene.paint.Color;
+import javafx.stage.FileChooser;
+import javafx.stage.Stage;
+import java.io.File;
+
+public class DrawingApp extends Application {
+    private double startY;
+    private double startX;
+    private final Canvas canvas = new Canvas(1920, 1080);
+    private final Canvas canvas_second = new Canvas(1920, 1080);
+    private final GraphicsContext gc = canvas.getGraphicsContext2D();
+    private final GraphicsContext gc_second = canvas_second.getGraphicsContext2D();
+
+    private final ColorPicker colorPicker = new ColorPicker(Color.BLACK);;
+    private final Slider lineWidthSlider = new Slider(1, 20, 10);;
+    private enum DrawMode {
+        FREE, RECTANGLE, CIRCLE
+    }
+
+    private DrawMode drawMode = DrawMode.FREE;
+    private javafx.scene.image.Image loadedImage = null;
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+
+    @Override
+    public void start(Stage primaryStage) {
+        primaryStage.setTitle("JavaFX Paint");
+
+        GridPane buttons_and_controls = new GridPane();
+
+        lineWidthSlider.setShowTickMarks(true);
+        lineWidthSlider.setShowTickLabels(true);
+
+        ToggleButton freeButton = new ToggleButton("Free");
+        ToggleButton rectangleButton = new ToggleButton("Rectangle");
+        ToggleButton circleButton = new ToggleButton("Circle");
+        freeButton.setSelected(true);
+
+        freeButton.setOnAction(e -> {
+            drawMode = DrawMode.FREE;
+            rectangleButton.setSelected(false);
+            circleButton.setSelected(false);
+        });
+
+        rectangleButton.setOnAction(e -> {
+            drawMode = DrawMode.RECTANGLE;
+            freeButton.setSelected(false);
+            circleButton.setSelected(false);
+        });
+
+        circleButton.setOnAction(e -> {
+            drawMode = DrawMode.CIRCLE;
+            freeButton.setSelected(false);
+            rectangleButton.setSelected(false);
+        });
+
+
+        canvas.setOnMousePressed(mousePressedHandler);
+        canvas.setOnMouseDragged(mouseDraggedHandler);
+        canvas.setOnDragDetected(event -> canvas.startFullDrag());
+        canvas.setOnMouseDragReleased(mouseReleasedHandler);
+
+        canvas_second.setOnMousePressed(mousePressedHandler);
+        canvas_second.setOnMouseDragged(mouseDraggedHandler);
+        canvas_second.setOnDragDetected(event -> canvas.startFullDrag());
+        canvas_second.setOnMouseDragReleased(mouseReleasedHandler);
+
+        HBox controlsBox = new HBox(10, freeButton, rectangleButton, circleButton, colorPicker, lineWidthSlider);
+
+        MenuBar menuBar = new MenuBar();
+        Menu fileMenu = new Menu("File");
+
+        MenuItem saveMenuItem = new MenuItem("Save");
+        saveMenuItem.setOnAction(e -> saveImage(canvas));
+
+        MenuItem loadMenuItem = new MenuItem("Load");
+        loadMenuItem.setOnAction(e -> {
+            FileChooser fileChooser = new FileChooser();
+            fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter("PNG Files", "*.png"));
+            File selectedFile = fileChooser.showOpenDialog(primaryStage);
+            if (selectedFile != null) {
+                loadImage(selectedFile.getAbsolutePath());
+            }
+        });
+
+        fileMenu.getItems().addAll(saveMenuItem, loadMenuItem);
+        menuBar.getMenus().add(fileMenu);
+
+        buttons_and_controls.add(menuBar, 0, 0);
+        buttons_and_controls.add(controlsBox, 0, 1);
+
+        Separator sep = new Separator();
+        sep.setOrientation(Orientation.VERTICAL);
+
+        StackPane stackPane = new StackPane(canvas_second, canvas);
+
+        VBox root = new VBox(menuBar, buttons_and_controls, sep, stackPane);
+
+        Scene scene = new Scene(root, 800, 600);
+        primaryStage.setScene(scene);
+        primaryStage.show();
+    }
+
+    private void drawLine(double endX, double endY) {
+        gc.lineTo(endX, endY);
+        gc.stroke();
+    }
+
+    private void drawRectangle(double x1, double y1, double x2, double y2, GraphicsContext gc) {
+        gc.strokeRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2 - x1), Math.abs(y2 - y1));
+    }
+
+    private void drawCircle(double x1, double y1, double x2, double y2, GraphicsContext gc) {
+        double radius = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
+        gc.strokeOval(x1 - radius, y1 - radius, radius * 2, radius * 2);
+    }
+
+    private void saveImage(Canvas canvas) {
+        FileChooser fileChooser = new FileChooser();
+        fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter("PNG Files", "*.png"));
+        File file = fileChooser.showSaveDialog(null);
+        if (file != null) {
+            try {
+                javafx.scene.image.WritableImage writableImage = new javafx.scene.image.WritableImage((int) canvas.getWidth(), (int) canvas.getHeight());
+                canvas.snapshot(null, writableImage);
+                javax.imageio.ImageIO.write(javafx.embed.swing.SwingFXUtils.fromFXImage(writableImage, null), "png", file);
+            } catch (Exception ex) {
+                ex.printStackTrace();
+            }
+        }
+    }
+
+    private void loadImage(String path) {
+        loadedImage = new javafx.scene.image.Image("file:" + path);
+        gc.drawImage(loadedImage, 0, 0);
+    }
+
+    EventHandler<MouseEvent> mousePressedHandler = e -> {
+        startX = e.getX();
+        startY = e.getY();
+
+        gc.beginPath();
+        gc.setStroke(colorPicker.getValue());
+        gc.setFill(colorPicker.getValue());
+        gc.setLineWidth(lineWidthSlider.getValue());
+
+        gc_second.beginPath();
+        gc_second.setStroke(colorPicker.getValue());
+        gc_second.setFill(colorPicker.getValue());
+        gc_second.setLineWidth(lineWidthSlider.getValue());
+    };
+
+    EventHandler<MouseEvent> mouseDraggedHandler = e -> {
+        gc_second.clearRect(0, 0, 1920, 1080);
+        if (drawMode == DrawMode.FREE) {
+            drawLine(e.getX(), e.getY());
+        } else if (drawMode == DrawMode.RECTANGLE) {
+            canvas.toBack();
+            gc_second.clearRect(0, 0, 1920, 1080);
+            drawRectangle(startX, startY, e.getX(), e.getY(), gc_second);
+        } else if (drawMode == DrawMode.CIRCLE) {
+            canvas.toBack();
+            gc_second.clearRect(0, 0, 1920, 1080);
+            drawCircle(startX, startY, e.getX(), e.getY(), gc_second);
+        }
+    };
+
+    EventHandler<MouseEvent> mouseReleasedHandler = e -> {
+        canvas.toFront();
+        if (drawMode == DrawMode.RECTANGLE) {
+            drawRectangle(startX, startY, e.getX(), e.getY(), gc);
+        } else if (drawMode == DrawMode.CIRCLE) {
+            drawCircle(startX, startY, e.getX(), e.getY(), gc);
+        }
+    };
+}