JavaFX:如何在调整大小后强制重新呈现可写图像?

JavaFX:如何在调整大小后强制重新呈现可写图像?,javafx,window-resize,Javafx,Window Resize,这个问题和下面的代码有一段历史,比较一下 导入javafx.application.application; 导入javafx.beans.Observable; 导入javafx.beans.property.SimpleDoubleProperty; 导入javafx.beans.property.SimpleIntegerProperty; 导入javafx.beans.value.ChangeListener; 导入javafx.beans.value.observeValue; 导入j

这个问题和下面的代码有一段历史,比较一下

导入javafx.application.application;
导入javafx.beans.Observable;
导入javafx.beans.property.SimpleDoubleProperty;
导入javafx.beans.property.SimpleIntegerProperty;
导入javafx.beans.value.ChangeListener;
导入javafx.beans.value.observeValue;
导入javafx.event.EventHandler;
导入javafx.geometry.Rectangle2D;
导入javafx.scene.Parent;
导入javafx.scene.scene;
导入javafx.scene.image.ImageView;
导入javafx.scene.image.PixelWriter;
导入javafx.scene.image.WritableImage;
导入javafx.scene.input.KeyCode;
导入javafx.scene.input.KeyEvent;
导入javafx.scene.layout.StackPane;
导入javafx.scene.paint.Color;
导入javafx.stage.Screen;
导入javafx.stage.stage;
公共类ImageOperationApp扩展了应用程序
{
私有SimpleDoubleProperty gridSize=新SimpleDoubleProperty(3.0);
私有SimpleDoubleProperty hueFactor=新的SimpleDoubleProperty(12.0);
私有SimpleDoubleProperty hueOffset=新SimpleDoubleProperty(240.0);
Rectangle2D scr=Screen.getPrimary().getVisualBounds();
int size1=(int)(scr.getWidth()*0.62);
intsize2=(int)(scr.getHeight()*0.62);
SimpleIntegerProperty sip1=新的SimpleIntegerProperty(888);
SimpleIntegerProperty sip2=新的SimpleIntegerProperty(888);
私有void渲染(可写图像img、双网格大小、双hueFactor、双hueOffset)
{
PixelWriter pw=img.getPixelWriter();
double w=sip1.doubleValue();
双h=sip2.doubleValue();
系统输出打印项次(“w”+w+“h”+h);
双X比值=0.0;
双yRatio=0.0;
双色调=0.0;
对于(int y=0;y{
renderImage(img、gridSize.doubleValue()、hueFactor.doubleValue()、hueOffset.doubleValue());
});
hueFactor.addListener((可观察)->{
renderImage(img、gridSize.doubleValue()、hueFactor.doubleValue()、hueOffset.doubleValue());
});
hueOffset.addListener((可观察)->{
renderImage(img、gridSize.doubleValue()、hueFactor.doubleValue()、hueOffset.doubleValue());
});
sip1.addListener((可观察)->{
renderImage(img、gridSize.doubleValue()、hueFactor.doubleValue()、hueOffset.doubleValue());
});
sip2.addListener((可观察)->{
renderImage(img、gridSize.doubleValue()、hueFactor.doubleValue()、hueOffset.doubleValue());
});     
渲染(img,3.0,12.0,240.0);
ImageView=新的ImageView(img);
root.getChildren().add(视图);
返回根;
}
@凌驾
public void start(Stage primaryStage)引发异常
{
场景=新场景(createContent());
scene.setOnKeyPressed(新的EventHandler()
{
@凌驾
公共无效句柄(KeyEvent事件)
{
if(event.getCode()==KeyCode.X)
gridSize.set(gridSize.get()+0.5);
if(event.getCode()==KeyCode.Y)
{
double t=gridSize.get();
t-=0.5;
if(t<0)
t=0;
gridSize.set(t);
}
if(event.getCode()==KeyCode.V)
hueFactor.set(hueFactor.get()+0.5);
if(event.getCode()==KeyCode.C)
{
double t=hueFactor.get();
t-=0.5;
if(t<0)
t=0;
hueFactor.set(t);
}
if(event.getCode()==KeyCode.N)
hueOffset.set(hueOffset.get()+10);
if(event.getCode()==KeyCode.B)
{
double t=hueOffset.get();
t-=10;
if(t<0)
t=0;
霍夫特集(t);
}
}
});
scene.widthProperty().addListener(新的ChangeListener()){

@Override public void changed(observeValue我对您的代码做了一些更改:

1) 新实例变量(包括
writeableimage
):

2) 在第一行的
renderImage
中实例化一个新的
writeableimage
并将其设置为
view

private void renderImage(double gridSize, double hueFactor, double hueOffset) {
    img = new WritableImage(sip1.intValue(), sip2.intValue());
    view.setImage(img);
    .....
}
3) 在
createContent

public Parent createContent() {
     StackPane root = new StackPane();
     img = new WritableImage(sip1.intValue(), sip2.intValue());
     view = new ImageView(img);
     ....
}
4) 在
start
中修复异常:

scene.widthProperty().addListener((observableValue, oldSceneWidth, newSceneWidth) -> {
    System.out.println("Width: " + newSceneWidth);
    int newValue = newSceneWidth.intValue();
    if (newValue < IMAGE_MAX_WIDTH) {
        sip1.set(newValue);
    }
});

scene.heightProperty().addListener((observableValue, oldSceneHeight, newSceneHeight) -> {
    System.out.println("Height: " + newSceneHeight);
    int newValue = newSceneHeight.intValue();
    if (newValue < IMAGE_MAX_HEIGHT) {
        sip2.set(newValue);
    }
});
scene.widthProperty().addListener((observeValue,oldSceneWidth,newSceneWidth)->{
System.out.println(“宽度:“+newSceneWidth”);
int newValue=newSceneWidth.intValue();
if(新值<图像最大宽度){
sip1.设置(新值);
}
});
scene.heightProperty().addListener((ObservalEvalue、OldScenehHeight、NewScenehHeight)->{
System.out.println(“高度:+newscenehHeight”);
int newValue=newSceneHeight.intValue();
if(新值<图像最大高度){
sip2.设置(新值);
}
});
如果我正确理解了您的问题,这些更改应该可以解决它

全班:

import javafx.application.Application;
import javafx.beans.Observable;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.event.EventHandler;
import javafx.geometry.Rectangle2D;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.image.ImageView;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Screen;
import javafx.stage.Stage;

public class ImageOperationApp extends Application {
    private SimpleDoubleProperty gridSize = new SimpleDoubleProperty(3.0);
    private SimpleDoubleProperty hueFactor = new SimpleDoubleProperty(12.0);
    private SimpleDoubleProperty hueOffset = new SimpleDoubleProperty(240.0);

    Rectangle2D scr = Screen.getPrimary().getVisualBounds();
    int size1 = (int) (scr.getWidth() * 0.62);
    int size2 = (int) (scr.getHeight() * 0.62);

    private static final int IMAGE_MAX_WIDTH = 888;
    private static final int IMAGE_MAX_HEIGHT = 888;

    private final SimpleIntegerProperty sip1 = new SimpleIntegerProperty(IMAGE_MAX_WIDTH);
    private final SimpleIntegerProperty sip2 = new SimpleIntegerProperty(IMAGE_MAX_HEIGHT);
    private WritableImage img = new WritableImage(sip1.get(), sip2.get());
    private ImageView view;
    private void renderImage(double gridSize, double hueFactor, double hueOffset) {
        img = new WritableImage(sip1.get(), sip2.get());
        view.setImage(img);
        PixelWriter pw = img.getPixelWriter();
        double w = sip1.doubleValue();
        double h = sip2.doubleValue();
        System.out.println("w " + w + " h " + h);
        double xRatio = 0.0;
        double yRatio = 0.0;
        double hue = 0.0;

        for (int y = 0; y < h; y++)
            for (int x = 0; x < w; x++) {
                xRatio = x / w;
                yRatio = y / h;
                hue = Math.sin(yRatio * (gridSize * Math.PI)) * Math.sin(xRatio * (gridSize * Math.PI))
                        * Math.tan(hueFactor / 20.0) * 360.0 + hueOffset;
                Color c = Color.hsb(hue, 1.0, 1.0);
                pw.setColor(x, y, c);
            }
    }

    public Parent createContent() {
        StackPane root = new StackPane();
        img = new WritableImage(sip1.intValue(), sip2.intValue());
        view = new ImageView(img);

        gridSize.addListener((Observable observable) -> {
            renderImage(gridSize.doubleValue(), hueFactor.doubleValue(), hueOffset.doubleValue());
        });

        hueFactor.addListener((Observable observable) -> {
            renderImage(gridSize.doubleValue(), hueFactor.doubleValue(), hueOffset.doubleValue());
        });
        hueOffset.addListener((Observable observable) -> {
            renderImage(gridSize.doubleValue(), hueFactor.doubleValue(), hueOffset.doubleValue());
        });

        sip1.addListener((Observable observable) -> {
            renderImage(gridSize.doubleValue(), hueFactor.doubleValue(), hueOffset.doubleValue());
        });

        sip2.addListener((Observable observable) -> {
            renderImage(gridSize.doubleValue(), hueFactor.doubleValue(), hueOffset.doubleValue());
        });

        renderImage(3.0, 12.0, 240.0);
        root.getChildren().add(view);
        return root;
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        Scene scene = new Scene(createContent());
        scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent event) {
                if (event.getCode() == KeyCode.X)
                    gridSize.set(gridSize.get() + 0.5);
                if (event.getCode() == KeyCode.Y) {
                    double t = gridSize.get();
                    t -= .5;
                    if (t < 0)
                        t = 0;
                    gridSize.set(t);
                }

                if (event.getCode() == KeyCode.V)
                    hueFactor.set(hueFactor.get() + 0.5);
                if (event.getCode() == KeyCode.C) {
                    double t = hueFactor.get();
                    t -= .5;
                    if (t < 0)
                        t = 0;
                    hueFactor.set(t);
                }

                if (event.getCode() == KeyCode.N)
                    hueOffset.set(hueOffset.get() + 10);
                if (event.getCode() == KeyCode.B) {
                    double t = hueOffset.get();
                    t -= 10;
                    if (t < 0)
                        t = 0;
                    hueOffset.set(t);
                }

            }
        });

        scene.widthProperty().addListener((observableValue, oldSceneWidth, newSceneWidth) -> {
            System.out.println("Width: " + newSceneWidth);
            int newValue = newSceneWidth.intValue();
            if (newValue < IMAGE_MAX_WIDTH) {
                sip1.set(newValue);
            }
        });

        scene.heightProperty().addListener((observableValue, oldSceneHeight, newSceneHeight) -> {
            System.out.println("Height: " + newSceneHeight);
            int newValue = newSceneHeight.intValue();
            if (newValue < IMAGE_MAX_HEIGHT) {
                sip2.set(newValue);
            }
        });
        primaryStage.setTitle("JavaFX Demo");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}
导入javafx.application.application;
导入javafx.beans.Observable;
导入javafx.beans.property.SimpleDoubleProperty;
导入javafx.beans.property.SimpleIntegerProperty;
导入javafx.event.EventHandler;
导入javafx.geometry.Rectangle2D;
导入javafx.scene.Parent;
导入javafx.scene.scene;
导入javafx.scene.image.ImageView;
导入javafx.scene.image.PixelWriter;
导入javafx.scene.image.WritableImage;
导入javafx.scene.input.KeyCode;
导入javafx
scene.widthProperty().addListener((observableValue, oldSceneWidth, newSceneWidth) -> {
    System.out.println("Width: " + newSceneWidth);
    int newValue = newSceneWidth.intValue();
    if (newValue < IMAGE_MAX_WIDTH) {
        sip1.set(newValue);
    }
});

scene.heightProperty().addListener((observableValue, oldSceneHeight, newSceneHeight) -> {
    System.out.println("Height: " + newSceneHeight);
    int newValue = newSceneHeight.intValue();
    if (newValue < IMAGE_MAX_HEIGHT) {
        sip2.set(newValue);
    }
});
import javafx.application.Application;
import javafx.beans.Observable;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.event.EventHandler;
import javafx.geometry.Rectangle2D;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.image.ImageView;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Screen;
import javafx.stage.Stage;

public class ImageOperationApp extends Application {
    private SimpleDoubleProperty gridSize = new SimpleDoubleProperty(3.0);
    private SimpleDoubleProperty hueFactor = new SimpleDoubleProperty(12.0);
    private SimpleDoubleProperty hueOffset = new SimpleDoubleProperty(240.0);

    Rectangle2D scr = Screen.getPrimary().getVisualBounds();
    int size1 = (int) (scr.getWidth() * 0.62);
    int size2 = (int) (scr.getHeight() * 0.62);

    private static final int IMAGE_MAX_WIDTH = 888;
    private static final int IMAGE_MAX_HEIGHT = 888;

    private final SimpleIntegerProperty sip1 = new SimpleIntegerProperty(IMAGE_MAX_WIDTH);
    private final SimpleIntegerProperty sip2 = new SimpleIntegerProperty(IMAGE_MAX_HEIGHT);
    private WritableImage img = new WritableImage(sip1.get(), sip2.get());
    private ImageView view;
    private void renderImage(double gridSize, double hueFactor, double hueOffset) {
        img = new WritableImage(sip1.get(), sip2.get());
        view.setImage(img);
        PixelWriter pw = img.getPixelWriter();
        double w = sip1.doubleValue();
        double h = sip2.doubleValue();
        System.out.println("w " + w + " h " + h);
        double xRatio = 0.0;
        double yRatio = 0.0;
        double hue = 0.0;

        for (int y = 0; y < h; y++)
            for (int x = 0; x < w; x++) {
                xRatio = x / w;
                yRatio = y / h;
                hue = Math.sin(yRatio * (gridSize * Math.PI)) * Math.sin(xRatio * (gridSize * Math.PI))
                        * Math.tan(hueFactor / 20.0) * 360.0 + hueOffset;
                Color c = Color.hsb(hue, 1.0, 1.0);
                pw.setColor(x, y, c);
            }
    }

    public Parent createContent() {
        StackPane root = new StackPane();
        img = new WritableImage(sip1.intValue(), sip2.intValue());
        view = new ImageView(img);

        gridSize.addListener((Observable observable) -> {
            renderImage(gridSize.doubleValue(), hueFactor.doubleValue(), hueOffset.doubleValue());
        });

        hueFactor.addListener((Observable observable) -> {
            renderImage(gridSize.doubleValue(), hueFactor.doubleValue(), hueOffset.doubleValue());
        });
        hueOffset.addListener((Observable observable) -> {
            renderImage(gridSize.doubleValue(), hueFactor.doubleValue(), hueOffset.doubleValue());
        });

        sip1.addListener((Observable observable) -> {
            renderImage(gridSize.doubleValue(), hueFactor.doubleValue(), hueOffset.doubleValue());
        });

        sip2.addListener((Observable observable) -> {
            renderImage(gridSize.doubleValue(), hueFactor.doubleValue(), hueOffset.doubleValue());
        });

        renderImage(3.0, 12.0, 240.0);
        root.getChildren().add(view);
        return root;
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        Scene scene = new Scene(createContent());
        scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent event) {
                if (event.getCode() == KeyCode.X)
                    gridSize.set(gridSize.get() + 0.5);
                if (event.getCode() == KeyCode.Y) {
                    double t = gridSize.get();
                    t -= .5;
                    if (t < 0)
                        t = 0;
                    gridSize.set(t);
                }

                if (event.getCode() == KeyCode.V)
                    hueFactor.set(hueFactor.get() + 0.5);
                if (event.getCode() == KeyCode.C) {
                    double t = hueFactor.get();
                    t -= .5;
                    if (t < 0)
                        t = 0;
                    hueFactor.set(t);
                }

                if (event.getCode() == KeyCode.N)
                    hueOffset.set(hueOffset.get() + 10);
                if (event.getCode() == KeyCode.B) {
                    double t = hueOffset.get();
                    t -= 10;
                    if (t < 0)
                        t = 0;
                    hueOffset.set(t);
                }

            }
        });

        scene.widthProperty().addListener((observableValue, oldSceneWidth, newSceneWidth) -> {
            System.out.println("Width: " + newSceneWidth);
            int newValue = newSceneWidth.intValue();
            if (newValue < IMAGE_MAX_WIDTH) {
                sip1.set(newValue);
            }
        });

        scene.heightProperty().addListener((observableValue, oldSceneHeight, newSceneHeight) -> {
            System.out.println("Height: " + newSceneHeight);
            int newValue = newSceneHeight.intValue();
            if (newValue < IMAGE_MAX_HEIGHT) {
                sip2.set(newValue);
            }
        });
        primaryStage.setTitle("JavaFX Demo");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}