帮我用javafx实现拖拽印章图片进行pdf盖章效果
时间: 2023-07-12 07:15:55 浏览: 60
好的,这是一个比较复杂的需求,需要分几个步骤来实现。
首先,我们需要使用 JavaFX 中的 ImageView 组件来加载印章图片。代码如下:
```java
ImageView stampImage = new ImageView(new Image("path/to/stampImage.png"));
```
接下来,我们需要监听鼠标拖拽事件,并在拖拽过程中实时更新印章的位置。代码如下:
```java
double mouseX, mouseY;
double imageX, imageY;
boolean dragging = false;
stampImage.setOnMousePressed(event -> {
dragging = true;
mouseX = event.getSceneX();
mouseY = event.getSceneY();
imageX = stampImage.getX();
imageY = stampImage.getY();
});
stampImage.setOnMouseDragged(event -> {
if (dragging) {
double deltaX = event.getSceneX() - mouseX;
double deltaY = event.getSceneY() - mouseY;
stampImage.setX(imageX + deltaX);
stampImage.setY(imageY + deltaY);
}
});
stampImage.setOnMouseReleased(event -> {
dragging = false;
});
```
现在,我们已经可以拖拽印章图片了。接下来,我们需要将印章图片添加到 PDF 文件中。我们可以使用 iText 库来实现这个功能。代码如下:
```java
try {
PdfDocument pdfDoc = new PdfDocument(new PdfReader("path/to/input.pdf"), new PdfWriter("path/to/output.pdf"));
PdfPage page = pdfDoc.getPage(1);
PdfCanvas canvas = new PdfCanvas(page);
// 获取印章图片的位置和大小
double x = stampImage.getX();
double y = stampImage.getY();
double width = stampImage.getBoundsInLocal().getWidth();
double height = stampImage.getBoundsInLocal().getHeight();
// 将印章图片绘制到 PDF 文件中
ImageData imageData = ImageDataFactory.create("path/to/stampImage.png");
Image image = new Image(imageData);
canvas.addImage(image, width, 0, 0, height, x, y, false);
pdfDoc.close();
} catch (IOException e) {
e.printStackTrace();
}
```
这样,我们就完成了印章图片的拖拽和 PDF 盖章的功能。完整代码如下:
```java
import java.io.IOException;
import com.itextpdf.io.image.ImageData;
import com.itextpdf.io.image.ImageDataFactory;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;
public class StampPDF extends Application {
@Override
public void start(Stage primaryStage) throws Exception {
// 创建画布和印章图片
Pane root = new Pane();
ImageView stampImage = new ImageView(new Image("path/to/stampImage.png"));
root.getChildren().add(stampImage);
// 监听鼠标拖拽事件
double mouseX, mouseY;
double imageX, imageY;
boolean dragging = false;
stampImage.setOnMousePressed(event -> {
dragging = true;
mouseX = event.getSceneX();
mouseY = event.getSceneY();
imageX = stampImage.getX();
imageY = stampImage.getY();
});
stampImage.setOnMouseDragged(event -> {
if (dragging) {
double deltaX = event.getSceneX() - mouseX;
double deltaY = event.getSceneY() - mouseY;
stampImage.setX(imageX + deltaX);
stampImage.setY(imageY + deltaY);
}
});
stampImage.setOnMouseReleased(event -> {
dragging = false;
});
// 显示窗口
Scene scene = new Scene(root, 800, 600);
primaryStage.setScene(scene);
primaryStage.show();
// 盖章
try {
PdfDocument pdfDoc = new PdfDocument(new PdfReader("path/to/input.pdf"), new PdfWriter("path/to/output.pdf"));
PdfPage page = pdfDoc.getPage(1);
PdfCanvas canvas = new PdfCanvas(page);
// 获取印章图片的位置和大小
double x = stampImage.getX();
double y = stampImage.getY();
double width = stampImage.getBoundsInLocal().getWidth();
double height = stampImage.getBoundsInLocal().getHeight();
// 将印章图片绘制到 PDF 文件中
ImageData imageData = ImageDataFactory.create("path/to/stampImage.png");
Image image = new Image(imageData);
canvas.addImage(image, width, 0, 0, height, x, y, false);
pdfDoc.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
```
需要注意的是,这里假设印章图片的大小和 PDF 页面的大小相同。如果印章图片的大小不同,需要对代码进行相应的调整。