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java - 获取事件的节点坐标并从 BufferedImage Javafx 读取 RGB

转载 作者:行者123 更新时间:2023-12-02 03:15:38 27 4
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您好,我正在尝试获取显示图像 5 个 View 的滚动 Pane 中单击坐标的 rgb。 ImageView 适合屏幕尺寸,而原始图像约为 8k x 4k 像素。下面是我寻找 RGB 的尝试,但是尽管我以前使用过此图像,但我始终遇到“无法读取输入文件”异常。还可能需要注意的是,我有一个缩放机制,其缩放总数由 SCALE_TOTAL

表示

点击代码

        mapScroll.addEventFilter(MouseEvent.MOUSE_CLICKED, e -> {
File mapFile = new File("WorldProvincialMap-v1.01.png");
commandOutput.setText(commandOutput.getText() + " \n" + e.getSceneX() + " " + e.getSceneY());
try {
BufferedImage mapBuffered = ImageIO.read(mapFile);
int rgb = 0;
if(mapScroll.getHvalue() < 0.2)
{
rgb = mapBuffered.getRGB((int) ( e.getSceneX() / SCALE_TOTAL), (int)(e.getSceneY() / SCALE_TOTAL));
}
else if(mapScroll.getHvalue() >= 0.2 && mapScroll.getHvalue() < 0.4)
{
rgb = mapBuffered.getRGB((int) (e.getSceneX() / (2/SCALE_TOTAL)), (int) (e.getSceneY() / (2/SCALE_TOTAL)));
}
else if(mapScroll.getHvalue() >= 0.4 && mapScroll.getHvalue() < 0.6)
{
rgb = mapBuffered.getRGB((int) (e.getSceneX() / (3/SCALE_TOTAL)), (int) (e.getSceneY() / (3/SCALE_TOTAL)));
}
else if(mapScroll.getHvalue() >= 0.6 && mapScroll.getHvalue() < 0.8)
{
rgb = mapBuffered.getRGB((int) (e.getSceneX() / (4/SCALE_TOTAL)), (int) (e.getSceneY() / (4/SCALE_TOTAL)));
}
else if(mapScroll.getHvalue() >= 0.8 && mapScroll.getHvalue() < 1);
{
rgb = mapBuffered.getRGB((int) (e.getSceneX() / (5/SCALE_TOTAL)), (int) (e.getSceneY() / (5/SCALE_TOTAL)));
}
commandOutput.setText(commandOutput.getText() + " \n" + Integer.toString(rgb));
} catch (IOException e1) {
e1.printStackTrace();
commandOutput.setText(commandOutput.getText() + " \n" + e1.getMessage());
}
});

堆栈跟踪

javax.imageio.IIOException: Can't read input file!
at javax.imageio.ImageIO.read(Unknown Source)
at gameaspects.SourceCodeVersion9.lambda$5(SourceCodeVersion9.java:208)
at com.sun.javafx.event.CompositeEventHandler$NormalEventFilterRecord.handleCapturingEvent(CompositeEventHandler.java:282)
at com.sun.javafx.event.CompositeEventHandler.dispatchCapturingEvent(CompositeEventHandler.java:98)
at com.sun.javafx.event.EventHandlerManager.dispatchCapturingEvent(EventHandlerManager.java:223)
at com.sun.javafx.event.EventHandlerManager.dispatchCapturingEvent(EventHandlerManager.java:180)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchCapturingEvent(CompositeEventDispatcher.java:43)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:52)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3470)
at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3398)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3766)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Unknown Source)

滚动 Pane

        Image mapImage = new Image("WorldProvincialMap-v1.01.png");
//Sets the map to full screen
GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
int width = gd.getDisplayMode().getWidth();
int height = gd.getDisplayMode().getHeight();
//Creating the gridPane
GridPane mapGrid = new GridPane();
//Creating the image views
ImageView mapView1 = new ImageView(mapImage);
ImageView mapView2 = new ImageView(mapImage);
ImageView mapView3 = new ImageView(mapImage);
ImageView mapView4 = new ImageView(mapImage);
ImageView mapView5 = new ImageView(mapImage);
//Fitting the image views to the screen size.
mapView1.setFitHeight(height);
mapView1.setFitWidth(width);
mapView2.setFitHeight(height);
mapView2.setFitWidth(width);
mapView3.setFitHeight(height);
mapView3.setFitWidth(width);
mapView4.setFitHeight(height);
mapView4.setFitWidth(width);
mapView5.setFitHeight(height);
mapView5.setFitWidth(width);
//Adding the imageViews to the girdPane
mapGrid.add(mapView1,0,0);
mapGrid.add(mapView2, 1, 0);
mapGrid.add(mapView3, 2, 0);
mapGrid.add(mapView4, 3, 0);
mapGrid.add(mapView5, 4, 0);
mapGrid.setManaged(false);
mapScroll.setContent(new Group(mapGrid));
mapScroll.setPannable(true);
//Removes the ScrollBars
mapScroll.setVbarPolicy(ScrollBarPolicy.NEVER);
mapScroll.setHbarPolicy(ScrollBarPolicy.NEVER);

最佳答案

您应该使用 javafx.scene.ImagePixelReader 来代替将数据加载到 BufferedImage 中。获取数据:

Image image = ...
int rgb = image.getPixelReader().getArgb(x, y);

// remove alpha; is this necessary???
rgb = rgb & 0xffffff;

这样您就可以避免将图像多次加载到内存中。

关于java - 获取事件的节点坐标并从 BufferedImage Javafx 读取 RGB,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40352766/

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