【发布时间】：2017-02-03 04:39:55
【问题描述】：
编辑答案：
您可以查看Fabian's answer 以及这个库 (https://github.com/goxr3plus/JFXCustomCursor)
实际问题
我想在JavaFX 中创建一个淡出 的光标，因此我正在使用WritableImage，并且我不断地从原始Image 读取像素并将它们写入一个新的WritableImage。然后我使用ImageCursor(writableImage) 将自定义光标设置为Scene，下面是完整代码（试一试）。 p>
问题是在需要透明像素的地方得到黑色像素。
请注意，以下所有类都必须在包 sample 中。
代码（主要）：
package sample;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;
public class Main extends Application {
FadingCursor fade = new FadingCursor();
@Override
public void start(Stage primaryStage) throws Exception {
primaryStage.setWidth(300);
primaryStage.setHeight(300);
Scene scene = new Scene(new FlowPane());
primaryStage.setScene(scene);
fade.startFade(scene,100);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
代码（FadingCursor）（已编辑）：
package sample;
import java.util.concurrent.CountDownLatch;
import javafx.application.Platform;
import javafx.scene.ImageCursor;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.PixelReader;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.paint.Color;
public class FadingCursor {
private int counter;
private Image cursorImage;
/**
* Change the image of the Cursor
*
* @param image
*/
public void setCursorImage(Image image) {
this.cursorImage = image;
}
/**
* Start fading the Cursor
*
* @param scene
*/
public void startFade(Scene scene, int millisecondsDelay) {
// Create a Thread
new Thread(() -> {
// Keep the original image stored here
Image image = new Image(getClass().getResourceAsStream("fire.png"), 64, 64, true, true);
PixelReader pixelReader = image.getPixelReader();
// Let's go
counter = 10;
for (; counter >= 0; counter--) {
CountDownLatch count = new CountDownLatch(1);
Platform.runLater(() -> {
// Create the fading image
WritableImage writable = new WritableImage(64, 64);
PixelWriter pixelWriter = writable.getPixelWriter();
// Fade out the image
for (int readY = 0; readY < image.getHeight(); readY++) {
for (int readX = 0; readX < image.getWidth(); readX++) {
Color color = pixelReader.getColor(readX, readY);
// Now write a brighter color to the PixelWriter.
// -------------------------Here some way happens
// the problem------------------
color = new Color(color.getRed(), color.getGreen(), color.getBlue(), (counter / 10.00) * color.getOpacity());
pixelWriter.setColor(readX, readY, color);
}
}
System.out.println("With counter:"+counter+" opacity is:" + writable.getPixelReader().getColor(32, 32).getOpacity());
scene.setCursor(new ImageCursor(writable));
count.countDown();
});
try {
// Wait JavaFX Thread to change the cursor
count.await();
// Sleep some time
Thread.sleep(millisecondsDelay);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
}
}
图片（需要下载）（右键->图片另存为...）：
【问题讨论】：
-
所以你的问题是图像周围的空白区域在正确显示时显示为黑色像素（而不是透明）？
-
@adam Ren 没错 :)