lab-03

lab-03/by/lamposhka/paint/Paint.java

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+package by.lamposhka.paint;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+
+import java.util.Objects;
+
+public class Paint extends Application {
+    @Override
+    public void start(Stage stage) throws Exception {
+        stage.setScene(new Scene(FXMLLoader.load(getClass().getResource("paint.fxml"))));
+        stage.setTitle("Lamposhka paint");
+        stage.setResizable(false);
+        stage.show();
+    }
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+}

lab-03/by/lamposhka/paint/PaintController.java

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+package by.lamposhka.paint;
+
+import com.sun.javafx.sg.prism.NGRectangle;
+import javafx.application.Platform;
+import javafx.collections.FXCollections;
+import javafx.embed.swing.SwingFXUtils;
+import javafx.event.ActionEvent;
+import javafx.fxml.FXML;
+import javafx.scene.SnapshotParameters;
+import javafx.scene.canvas.Canvas;
+import javafx.scene.canvas.GraphicsContext;
+import javafx.scene.control.ColorPicker;
+import javafx.scene.control.ComboBox;
+import javafx.scene.control.TextField;
+import javafx.scene.image.Image;
+import javafx.scene.image.WritableImage;
+import javafx.scene.input.MouseDragEvent;
+import javafx.scene.input.MouseEvent;
+import javafx.scene.paint.Color;
+import javafx.scene.shape.StrokeLineCap;
+import javafx.scene.shape.StrokeLineJoin;
+import javafx.scene.transform.Transform;
+import javafx.stage.FileChooser;
+import javafx.stage.Stage;
+
+import javax.imageio.ImageIO;
+import java.io.File;
+import java.io.IOException;
+
+public class PaintController {
+
+    private enum BrushMode {
+        PEN, CIRCLE, RECTANGLE, ERASER
+    }
+
+    @FXML
+    private Canvas canvas;
+
+    @FXML
+    private ColorPicker colorPicker;
+
+    @FXML
+    private TextField brushSize;
+
+    @FXML
+    private ComboBox<BrushMode> brushChoiceBox;
+    private GraphicsContext graphicsContext;
+    private double prevX, prevY;
+    WritableImage snapshot;
+
+    private final int pixelScaleFactor = 2;
+
+    public void initialize() {
+        graphicsContext = canvas.getGraphicsContext2D();
+        graphicsContext.setFill(Color.WHITE);
+        graphicsContext.fillRect(0, 0, canvas.getWidth(), canvas.getHeight());
+        brushSize.setText("20");
+        brushChoiceBox.setItems(FXCollections.observableArrayList(BrushMode.values()));
+        brushChoiceBox.setValue(BrushMode.PEN);
+        colorPicker.setValue(Color.BLACK);
+        prevX = 0;
+        prevY = 0;
+        SnapshotParameters parameters = new SnapshotParameters();
+        parameters.setFill(Color.WHITE);
+        snapshot = canvas.snapshot(parameters, null);
+    }
+
+    public void onOpen(ActionEvent actionEvent) {
+        FileChooser fileChooser = new FileChooser();
+        fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter("Image Files", "*.png", "*.jpg", "*.jpeg", "*.gif"));
+        Stage stage = new Stage();
+        File selectedFile = fileChooser.showOpenDialog(stage);
+
+        if (selectedFile != null) {
+            // Load the selected image file
+            Image image = new Image(selectedFile.toURI().toString());
+
+            // Clear the canvas
+            canvas.getGraphicsContext2D().clearRect(0, 0, canvas.getWidth(), canvas.getHeight());
+
+            // Draw the image on the canvas
+            canvas.getGraphicsContext2D().drawImage(image, 0, 0, canvas.getWidth(), canvas.getHeight());
+        }
+    }
+
+    public void canvasMousePressed(MouseEvent e) {
+        prevX = e.getX();
+        prevY = e.getY();
+        graphicsContext.beginPath();
+        WritableImage writableImage = new WritableImage((int) Math.rint(pixelScaleFactor * canvas.getWidth()), (int) Math.rint(pixelScaleFactor * canvas.getHeight()));
+        SnapshotParameters parameters = new SnapshotParameters();
+        parameters.setTransform(Transform.scale(pixelScaleFactor, pixelScaleFactor));
+        parameters.setFill(Color.WHITE);
+        snapshot = canvas.snapshot(parameters, writableImage);
+    }
+
+    public void canvasMouseDragged(MouseEvent mouseEvent) {
+        double size = Double.parseDouble(brushSize.getText());
+        double x = mouseEvent.getX();
+        double y = mouseEvent.getY();
+
+        graphicsContext.setLineWidth(size);
+        graphicsContext.setLineCap(StrokeLineCap.ROUND);
+        graphicsContext.setLineJoin(StrokeLineJoin.ROUND);
+
+        switch (brushChoiceBox.getValue()) {
+            case ERASER:
+                graphicsContext.setStroke(Color.WHITE);
+                graphicsContext.lineTo(mouseEvent.getX(), mouseEvent.getY());
+                graphicsContext.stroke();
+                break;
+            case PEN:
+                graphicsContext.setStroke(colorPicker.getValue());
+                graphicsContext.lineTo(mouseEvent.getX(), mouseEvent.getY());
+                graphicsContext.stroke();
+                break;
+            case RECTANGLE:
+                graphicsContext.drawImage(snapshot, 0, 0, canvas.getHeight(), canvas.getWidth());
+                graphicsContext.setStroke(colorPicker.getValue());
+                graphicsContext.strokeRect(Math.min(prevX, x), Math.min(prevY, y), Math.abs(x - prevX), Math.abs(y - prevY));
+                break;
+            case CIRCLE:
+                graphicsContext.drawImage(snapshot, 0, 0, canvas.getHeight(), canvas.getWidth());
+                graphicsContext.setStroke(colorPicker.getValue());
+                double radius = Math.sqrt((x - prevX) * (x - prevX) + (y - prevY) * (y - prevY));
+                graphicsContext.strokeOval(prevX - radius, prevY - radius, 2 * radius, 2 * radius);
+                break;
+        }
+
+    }
+
+    public void canvasMouseReleased(MouseDragEvent mouseEvent) {
+        WritableImage writableImage = new WritableImage((int) Math.rint(pixelScaleFactor * canvas.getWidth()), (int) Math.rint(pixelScaleFactor * canvas.getHeight()));
+        SnapshotParameters parameters = new SnapshotParameters();
+        parameters.setTransform(Transform.scale(pixelScaleFactor, pixelScaleFactor));
+        parameters.setFill(Color.WHITE);
+        snapshot = canvas.snapshot(parameters, writableImage);
+    }
+
+    public void onExit() {
+        Platform.exit();
+    }
+
+    public void onSave(ActionEvent actionEvent) {
+        SnapshotParameters parameters = new SnapshotParameters();
+        parameters.setFill(Color.WHITE);
+        WritableImage writableImage = canvas.snapshot(parameters, null);
+
+        FileChooser fileChooser = new FileChooser();
+        fileChooser.setTitle("Save Canvas");
+        fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter("PNG Image", "*.png"));
+        File file = fileChooser.showSaveDialog(canvas.getScene().getWindow());
+
+        if (file != null) {
+            try {
+                ImageIO.write(SwingFXUtils.fromFXImage(writableImage, null), "png", file);
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}

lab-03/by/lamposhka/paint/paint.fxml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import java.lang.*?>
+<?import java.util.*?>
+<?import javafx.scene.*?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+
+<?import javafx.scene.canvas.Canvas?>
+<?import javafx.collections.FXCollections?>
+<BorderPane xmlns="http://javafx.com/javafx"
+            xmlns:fx="http://javafx.com/fxml"
+            fx:controller="by.lamposhka.paint.PaintController"
+            prefHeight="800.0" prefWidth="800.0">
+    <top>
+        <VBox>
+            <MenuBar>
+                <Menu text="File">
+                    <MenuItem text="Save" onAction="#onSave"/>
+                    <MenuItem text="Open" onAction="#onOpen"/>
+                    <MenuItem text="Exit" onAction="#onExit"/>
+                </Menu>
+            </MenuBar>
+
+            <ToolBar>
+                <HBox alignment="CENTER" spacing="5">
+                    <TextField fx:id="brushSize"/>
+                    <ColorPicker fx:id="colorPicker"/>
+                    <ComboBox fx:id="brushChoiceBox">
+                    </ComboBox>
+                </HBox>
+            </ToolBar>
+        </VBox>
+    </top>
+
+    <center>
+        <Canvas fx:id="canvas" width="800" height="800" onMousePressed="#canvasMousePressed"
+                onMouseDragged="#canvasMouseDragged" onMouseDragReleased="#canvasMouseReleased"/>
+    </center>
+
+</BorderPane>