Looking for ways to print an image on the screen, I found this class, which basically does everything I need.
package manipulaimagem;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import javafx.application.Application;
import javafx.geometry.Orientation;
import javafx.geometry.Pos;
import javafx.geometry.Rectangle2D;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import javafx.stage.FileChooser.ExtensionFilter;
import javafx.scene.Cursor;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.control.TextField;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
/**
*
* @author Giovani
*/
public class ManipulaImagemOP extends Application {
static double initx;
static double inity;
static int height;
static int width;
public static String path;
static Scene initialScene, View;
static double offSetX, offSetY, zoomlvl;
@Override
public void start(Stage s) {
s.setResizable(false);
GridPane grid = new GridPane();
grid.setHgap(20);
grid.setVgap(20);
grid.setAlignment(Pos.CENTER);
Label hint = new Label("Select Your Image");
TextField URL = new TextField();
URL.setEditable(false);
URL.setPrefWidth(350);
Button browse = new Button("Browse");
FileChooser fc = new FileChooser();
ExtensionFilter png = new ExtensionFilter("png", "*.png");
ExtensionFilter jpg = new ExtensionFilter("jpg", "*.jpg");
fc.getExtensionFilters().addAll(png, jpg);
browse.setOnAction(e -> {
URL.setText(fc.showOpenDialog(s).getAbsolutePath());
});
Button open = new Button("Open");
open.setOnAction(e -> {
path = URL.getText();
initView();
s.setScene(View);
});
grid.add(hint, 0, 0);
grid.add(URL, 1, 0);
grid.add(browse, 2, 0);
grid.add(open, 2, 1);
initialScene = new Scene(grid, 600, 100);
s.setScene(initialScene);
s.show();
}
public static void initView() {
VBox root = new VBox(20);
root.setAlignment(Pos.CENTER);
Label title = new Label("Teste de Título");
Image source = null;
try {
source = new Image(new FileInputStream(path));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
ImageView image = new ImageView(source);
double ratio = source.getWidth() / source.getHeight();
if (500 / ratio < 500) {
width = 500;
height = (int) (500 / ratio);
} else if (500 * ratio < 500) {
height = 500;
width = (int) (500 * ratio);
} else {
height = 500;
width = 500;
}
image.setPreserveRatio(false);
image.setFitWidth(width);
image.setFitHeight(height);
height = (int) source.getHeight();
width = (int) source.getWidth();
System.out.println("height = " height "\nwidth = " width);
HBox zoom = new HBox(10);
zoom.setAlignment(Pos.CENTER);
Slider zoomLvl = new Slider();
zoomLvl.setMax(4);
zoomLvl.setMin(1);
zoomLvl.setMaxWidth(200);
zoomLvl.setMinWidth(200);
Label hint = new Label("Zoom Level");
Label value = new Label("1.0");
offSetX = width / 2;
offSetY = height / 2;
zoom.getChildren().addAll(hint, zoomLvl, value);
Slider Hscroll = new Slider();
Hscroll.setMin(0);
Hscroll.setMax(width);
Hscroll.setMaxWidth(image.getFitWidth());
Hscroll.setMinWidth(image.getFitWidth());
Hscroll.setTranslateY(-20);
Slider Vscroll = new Slider();
Vscroll.setMin(0);
Vscroll.setMax(height);
Vscroll.setMaxHeight(image.getFitHeight());
Vscroll.setMinHeight(image.getFitHeight());
Vscroll.setOrientation(Orientation.VERTICAL);
Vscroll.setTranslateX(-20);
BorderPane imageView = new BorderPane();
BorderPane.setAlignment(Hscroll, Pos.CENTER);
BorderPane.setAlignment(Vscroll, Pos.CENTER_LEFT);
Hscroll.valueProperty().addListener(e -> {
offSetX = Hscroll.getValue();
zoomlvl = zoomLvl.getValue();
double newValue = (double) ((int) (zoomlvl * 10)) / 10;
value.setText(newValue "");
if (offSetX < (width / newValue) / 2) {
offSetX = (width / newValue) / 2;
}
if (offSetX > width - ((width / newValue) / 2)) {
offSetX = width - ((width / newValue) / 2);
}
image.setViewport(new Rectangle2D(offSetX - ((width / newValue) / 2), offSetY - ((height / newValue) / 2), width / newValue, height / newValue));
});
Vscroll.valueProperty().addListener(e -> {
offSetY = height - Vscroll.getValue();
zoomlvl = zoomLvl.getValue();
double newValue = (double) ((int) (zoomlvl * 10)) / 10;
value.setText(newValue "");
if (offSetY < (height / newValue) / 2) {
offSetY = (height / newValue) / 2;
}
if (offSetY > height - ((height / newValue) / 2)) {
offSetY = height - ((height / newValue) / 2);
}
image.setViewport(new Rectangle2D(offSetX - ((width / newValue) / 2), offSetY - ((height / newValue) / 2), width / newValue, height / newValue));
});
imageView.setCenter(image);
imageView.setTop(Hscroll);
imageView.setRight(Vscroll);
zoomLvl.valueProperty().addListener(e -> {
zoomlvl = zoomLvl.getValue();
double newValue = (double) ((int) (zoomlvl * 10)) / 10;
value.setText(newValue "");
if (offSetX < (width / newValue) / 2) {
offSetX = (width / newValue) / 2;
}
if (offSetX > width - ((width / newValue) / 2)) {
offSetX = width - ((width / newValue) / 2);
}
if (offSetY < (height / newValue) / 2) {
offSetY = (height / newValue) / 2;
}
if (offSetY > height - ((height / newValue) / 2)) {
offSetY = height - ((height / newValue) / 2);
}
Hscroll.setValue(offSetX);
Vscroll.setValue(height - offSetY);
image.setViewport(new Rectangle2D(offSetX - ((width / newValue) / 2), offSetY - ((height / newValue) / 2), width / newValue, height / newValue));
});
imageView.setCursor(Cursor.OPEN_HAND);
image.setOnMousePressed(e -> {
initx = e.getSceneX();
inity = e.getSceneY();
imageView.setCursor(Cursor.CLOSED_HAND);
});
image.setOnMouseReleased(e -> {
imageView.setCursor(Cursor.OPEN_HAND);
});
image.setOnMouseDragged(e -> {
Hscroll.setValue(Hscroll.getValue() (initx - e.getSceneX()));
Vscroll.setValue(Vscroll.getValue() - (inity - e.getSceneY()));
initx = e.getSceneX();
inity = e.getSceneY();
});
root.getChildren().addAll(title, imageView, zoom);
View = new Scene(root, (image.getFitWidth()) 70, (image.getFitHeight()) 150);
}
public static void main(String[] args) {
launch(args);
}
}
I adapted it to my project this way, I'm searching the database, and exporting the image, for later import.
The export is happening correctly, it generates the image in the folder, however when importing, the screen opens empty and does not show the image.It does not show errors in the console.
package eletronicstorefx;
import dao.EntradaDocumentoDAO;
import static eletronicstorefx.EletronicStoreFX.codEntrada;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.geometry.Orientation;
import javafx.geometry.Pos;
import javafx.geometry.Rectangle2D;
import javafx.scene.Cursor;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import model.EntradaDocumentos;
/**
*
* @author Giovani
*/
public class ManipulaImagem extends Application {
static double initx;
static double inity;
static int height;
static int width;
public static String path = ("C:/Electronics_StoreSC/NotasFiscais/nf.jpg");
static Scene initialScene, View;
static double offSetX, offSetY, zoomlvl;
public static byte[] byte_array;
@Override
public void start(Stage s) throws IOException {
}
public void testaInici() throws IOException {
EntradaDocumentoDAO entDocDAO = new EntradaDocumentoDAO();
EntradaDocumentos entDoc = new EntradaDocumentos();
entDoc = entDocDAO.getNotaFiscal(codEntrada);
byte_array = entDoc.getNOTA_FISCAL();
ByteToImage();
Stage stage = new Stage();
stage.setResizable(false);
GridPane grid = new GridPane();
grid.setHgap(20);
grid.setVgap(20);
grid.setAlignment(Pos.CENTER);
initView();
stage.setScene(View);
initialScene = new Scene(grid, 600, 100);
stage.setScene(initialScene);
stage.show();
}
public static void ByteToImage() {
byte[] imgBytes = byte_array;
try {
FileOutputStream fos = new FileOutputStream(path);
fos.write(imgBytes);
FileDescriptor fd = fos.getFD();
fos.flush();
fd.sync();
fos.close();
} catch (Exception e) {
System.out.println("Exception " e);
}
}
public static void initView() {
VBox root = new VBox(20);
root.setAlignment(Pos.CENTER);
Label title = new Label("");
Image source = null;
try {
source = new Image(new FileInputStream(path));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
ImageView image = new ImageView(source);
double ratio = source.getWidth() / source.getHeight();
if (500 / ratio < 500) {
width = 500;
height = (int) (500 / ratio);
} else if (500 * ratio < 500) {
height = 500;
width = (int) (500 * ratio);
} else {
height = 500;
width = 500;
}
image.setPreserveRatio(false);
image.setFitWidth(width);
image.setFitHeight(height);
height = (int) source.getHeight();
width = (int) source.getWidth();
System.out.println("height = " height "\nwidth = " width);
HBox zoom = new HBox(10);
zoom.setAlignment(Pos.CENTER);
Slider zoomLvl = new Slider();
zoomLvl.setMax(4);
zoomLvl.setMin(1);
zoomLvl.setMaxWidth(200);
zoomLvl.setMinWidth(200);
Label hint = new Label("Zoom Level");
Label value = new Label("1.0");
offSetX = width / 2;
offSetY = height / 2;
zoom.getChildren().addAll(hint, zoomLvl, value);
Slider Hscroll = new Slider();
Hscroll.setMin(0);
Hscroll.setMax(width);
Hscroll.setMaxWidth(image.getFitWidth());
Hscroll.setMinWidth(image.getFitWidth());
Hscroll.setTranslateY(-20);
Slider Vscroll = new Slider();
Vscroll.setMin(0);
Vscroll.setMax(height);
Vscroll.setMaxHeight(image.getFitHeight());
Vscroll.setMinHeight(image.getFitHeight());
Vscroll.setOrientation(Orientation.VERTICAL);
Vscroll.setTranslateX(-20);
BorderPane imageView = new BorderPane();
BorderPane.setAlignment(Hscroll, Pos.CENTER);
BorderPane.setAlignment(Vscroll, Pos.CENTER_LEFT);
Hscroll.valueProperty().addListener(e -> {
offSetX = Hscroll.getValue();
zoomlvl = zoomLvl.getValue();
double newValue = (double) ((int) (zoomlvl * 10)) / 10;
value.setText(newValue "");
if (offSetX < (width / newValue) / 2) {
offSetX = (width / newValue) / 2;
}
if (offSetX > width - ((width / newValue) / 2)) {
offSetX = width - ((width / newValue) / 2);
}
image.setViewport(new Rectangle2D(offSetX - ((width / newValue) / 2), offSetY - ((height / newValue) / 2), width / newValue, height / newValue));
});
Vscroll.valueProperty().addListener(e -> {
offSetY = height - Vscroll.getValue();
zoomlvl = zoomLvl.getValue();
double newValue = (double) ((int) (zoomlvl * 10)) / 10;
value.setText(newValue "");
if (offSetY < (height / newValue) / 2) {
offSetY = (height / newValue) / 2;
}
if (offSetY > height - ((height / newValue) / 2)) {
offSetY = height - ((height / newValue) / 2);
}
image.setViewport(new Rectangle2D(offSetX - ((width / newValue) / 2), offSetY - ((height / newValue) / 2), width / newValue, height / newValue));
});
imageView.setCenter(image);
imageView.setTop(Hscroll);
imageView.setRight(Vscroll);
zoomLvl.valueProperty().addListener(e -> {
zoomlvl = zoomLvl.getValue();
double newValue = (double) ((int) (zoomlvl * 10)) / 10;
value.setText(newValue "");
if (offSetX < (width / newValue) / 2) {
offSetX = (width / newValue) / 2;
}
if (offSetX > width - ((width / newValue) / 2)) {
offSetX = width - ((width / newValue) / 2);
}
if (offSetY < (height / newValue) / 2) {
offSetY = (height / newValue) / 2;
}
if (offSetY > height - ((height / newValue) / 2)) {
offSetY = height - ((height / newValue) / 2);
}
Hscroll.setValue(offSetX);
Vscroll.setValue(height - offSetY);
image.setViewport(new Rectangle2D(offSetX - ((width / newValue) / 2), offSetY - ((height / newValue) / 2), width / newValue, height / newValue));
});
imageView.setCursor(Cursor.OPEN_HAND);
image.setOnMousePressed(e -> {
initx = e.getSceneX();
inity = e.getSceneY();
imageView.setCursor(Cursor.CLOSED_HAND);
});
image.setOnMouseReleased(e -> {
imageView.setCursor(Cursor.OPEN_HAND);
});
image.setOnMouseDragged(e -> {
Hscroll.setValue(Hscroll.getValue() (initx - e.getSceneX()));
Vscroll.setValue(Vscroll.getValue() - (inity - e.getSceneY()));
initx = e.getSceneX();
inity = e.getSceneY();
});
root.getChildren().addAll(title, imageView, zoom);
View = new Scene(root, (image.getFitWidth()) 70, (image.getFitHeight()) 150);
}
public static void main(String[] args) {
launch(args);
}
}
Is it possible to convert Byte[] to ImagemView without exporting and importing? What's wrong with not showing the image on the screen? I searched the internet and didn't find a conversion method.
Reproduzi o mesmo código que tenho, basta alterar o caminho da imagem para testar.
Ele até exibe o tamanho da imagem, só não mostra na tela.
package stackproject;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.embed.swing.SwingFXUtils;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Orientation;
import javafx.geometry.Pos;
import javafx.geometry.Rectangle2D;
import javafx.scene.Cursor;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javax.imageio.ImageIO;
/**
*
* @author Giovani
*/
public class StackProject extends Application {
static double initx;
static double inity;
static int height;
static int width;
public static String path = ("C:/Electronics_StoreSC/NotasFiscais/nf.jpg");
static Scene initialScene, View;
static double offSetX, offSetY, zoomlvl;
public static byte[] byteArray;
@Override
public void start(Stage primaryStage) {
try {
imageToByte(path);
} catch (IOException ex) {
ex.printStackTrace();
}
Stage stage = new Stage();
stage.setResizable(false);
GridPane grid = new GridPane();
grid.setHgap(20);
grid.setVgap(20);
grid.setAlignment(Pos.CENTER);
initialScene = new Scene(grid, 600, 100);
stage.setScene(initialScene);
stage.show();
VBox root = new VBox(20);
root.setAlignment(Pos.CENTER);
Label title = new Label("Teste de Titulo");
Image source = null;
try {
source = new Image(new FileInputStream(path));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
ImageView image = new ImageView(source);
double ratio = source.getWidth() / source.getHeight();
if (500 / ratio < 500) {
width = 500;
height = (int) (500 / ratio);
} else if (500 * ratio < 500) {
height = 500;
width = (int) (500 * ratio);
} else {
height = 500;
width = 500;
}
image.setPreserveRatio(false);
image.setFitWidth(width);
image.setFitHeight(height);
height = (int) source.getHeight();
width = (int) source.getWidth();
System.out.println("height = " height "\nwidth = " width);
HBox zoom = new HBox(10);
zoom.setAlignment(Pos.CENTER);
Slider zoomLvl = new Slider();
zoomLvl.setMax(4);
zoomLvl.setMin(1);
zoomLvl.setMaxWidth(200);
zoomLvl.setMinWidth(200);
Label hint = new Label("Zoom Level");
Label value = new Label("1.0");
offSetX = width / 2;
offSetY = height / 2;
zoom.getChildren().addAll(hint, zoomLvl, value);
Slider Hscroll = new Slider();
Hscroll.setMin(0);
Hscroll.setMax(width);
Hscroll.setMaxWidth(image.getFitWidth());
Hscroll.setMinWidth(image.getFitWidth());
Hscroll.setTranslateY(-20);
Slider Vscroll = new Slider();
Vscroll.setMin(0);
Vscroll.setMax(height);
Vscroll.setMaxHeight(image.getFitHeight());
Vscroll.setMinHeight(image.getFitHeight());
Vscroll.setOrientation(Orientation.VERTICAL);
Vscroll.setTranslateX(-20);
BorderPane imageView = new BorderPane();
BorderPane.setAlignment(Hscroll, Pos.CENTER);
BorderPane.setAlignment(Vscroll, Pos.CENTER_LEFT);
Hscroll.valueProperty().addListener(e -> {
offSetX = Hscroll.getValue();
zoomlvl = zoomLvl.getValue();
double newValue = (double) ((int) (zoomlvl * 10)) / 10;
value.setText(newValue "");
if (offSetX < (width / newValue) / 2) {
offSetX = (width / newValue) / 2;
}
if (offSetX > width - ((width / newValue) / 2)) {
offSetX = width - ((width / newValue) / 2);
}
image.setViewport(new Rectangle2D(offSetX - ((width / newValue) / 2), offSetY - ((height / newValue) / 2), width / newValue, height / newValue));
});
Vscroll.valueProperty().addListener(e -> {
offSetY = height - Vscroll.getValue();
zoomlvl = zoomLvl.getValue();
double newValue = (double) ((int) (zoomlvl * 10)) / 10;
value.setText(newValue "");
if (offSetY < (height / newValue) / 2) {
offSetY = (height / newValue) / 2;
}
if (offSetY > height - ((height / newValue) / 2)) {
offSetY = height - ((height / newValue) / 2);
}
image.setViewport(new Rectangle2D(offSetX - ((width / newValue) / 2), offSetY - ((height / newValue) / 2), width / newValue, height / newValue));
});
imageView.setCenter(image);
imageView.setTop(Hscroll);
imageView.setRight(Vscroll);
zoomLvl.valueProperty().addListener(e -> {
zoomlvl = zoomLvl.getValue();
double newValue = (double) ((int) (zoomlvl * 10)) / 10;
value.setText(newValue "");
if (offSetX < (width / newValue) / 2) {
offSetX = (width / newValue) / 2;
}
if (offSetX > width - ((width / newValue) / 2)) {
offSetX = width - ((width / newValue) / 2);
}
if (offSetY < (height / newValue) / 2) {
offSetY = (height / newValue) / 2;
}
if (offSetY > height - ((height / newValue) / 2)) {
offSetY = height - ((height / newValue) / 2);
}
Hscroll.setValue(offSetX);
Vscroll.setValue(height - offSetY);
image.setViewport(new Rectangle2D(offSetX - ((width / newValue) / 2), offSetY - ((height / newValue) / 2), width / newValue, height / newValue));
});
imageView.setCursor(Cursor.OPEN_HAND);
CodePudding user response：
Use a ByteArrayInputStream. Just replace:
new Image(new FileInputStream(path))
With:
new Image(new ByteArrayInputStream(byte_array))
(Although you should probably also replace byte_array with byteArray to conform to Java naming conventions.)
CodePudding user response：
The window is empty because you explicitly write code to display an empty window:
@Override
public void start(Stage stage) {
/*
...
*/
stage.setResizable(false);
// The next four lines create a GridPane,
// and configure it in terms of gaps between its
// components and how it is aligned:
GridPane grid = new GridPane();
grid.setHgap(20);
grid.setVgap(20);
grid.setAlignment(Pos.CENTER);
// You have not put any content in the grid pane,
// so it is still empty
// The next line creates a scene containing the empty grid pane.
// Since the grid pane is empty, the scene does not display anything.
initialScene = new Scene(grid, 600, 100);
// This sets the scene of the stage (the window) to the (empty) scene:
stage.setScene(initialScene);
// And now you show the window, which is displaying an empty scene:
stage.show();
/*
...
*/
}