无法在JavaFX中的热敏打印机上打印文本的全部内容

问题描述

我正在使用textArea作为节点的80毫米热敏打印机上打印一串文本。但是在打印完之后，文本的高度被截断了。下面是我得到的输出图像：

但是我正在打印此示例文本，现在收据上显示的内容是

    TextArea textArea = new TextArea();
    textArea.appendText("*********************************************" + "\n");
    textArea.appendText("             " + companyName + "            \n");
    textArea.appendText("*********************************************" + "\n");
    textArea.appendText("Location: " + companyLocation + "\n");
    textArea.appendText("Contact Us: " + phoneNumber + "\n");
    textArea.appendText("TIN: " + tinNumber + "\n");
    textArea.appendText("Receipt No: " + transactionGeneratedId + "\n");
    textArea.appendText("Date: " + getCurrentTimeStamp() + "\n");
    textArea.appendText("---------------------------------------------" + "\n");

这是用于创建文本字符串并将其附加到textArea的方法：

//*** issue print command
public void printReceipt(){
    // print(getPrintableText());
    printNode(getPrintableText());

}

//*** prepare text for printing
public Node getPrintableText(){

    TextArea textArea = new TextArea();

    textArea.appendText("*********************************************" + "\n");
    textArea.appendText("             " + companyName + "            \n");
    textArea.appendText("*********************************************" + "\n");

    textArea.appendText("Location: " + companyLocation + "\n");
    textArea.appendText("Contact Us: " + phoneNumber + "\n");
    textArea.appendText("TIN: " + tinNumber + "\n");
    textArea.appendText("Receipt No: " + transactionGeneratedId + "\n");
    textArea.appendText("Date: " + getCurrentTimeStamp() + "\n");
    textArea.appendText("---------------------------------------------" + "\n");

    // get each product and add to printing list
    for(Products product: productList){

        if(product.getProduct_name().length() > 10){
            // getting the first 11 characters of the product name
            String name = product.getProduct_name().substring(0,9)+ "...";
            textArea.appendText(product.getQuantity_purchased() + " x " + name +  "          " + currencySymbol + product.getUnit_selling_price() + "\n");

        }else{
            textArea.appendText(product.getQuantity_purchased() + " x " + product.getProduct_name()
                    +  "            " + currencySymbol + product.getUnit_selling_price() + "\n");
        }

        textArea.appendText("Subtotal                 "  + currencySymbol + (Double.parseDouble(product.getQuantity_purchased()) *
                Double.parseDouble(product.getUnit_selling_price())) + "\n");
        textArea.appendText("---------------------------------------------" + "\n");

    }

    // get overall total
    textArea.appendText("Overall Total             " + currencySymbol + totalPrice + "\n");

    String cashReceived = fieldCashReceived.getText().trim();

    // get total amount
    textArea.appendText("Amount Paid               " + currencySymbol + cashReceived + "\n");

    double balance = totalPrice - Double.parseDouble(cashReceived);

    textArea.appendText("_____________________________________________" + "\n");

    // get balance
    textArea.appendText("Balance                   " + currencySymbol + balance + "\n");

    textArea.appendText("*********************************************" + "\n");

    textArea.appendText("Thank you so much!" + "\n");

    textArea.appendText("*********************************************");

    return textArea;
}

这是打印方法：

    public void printNode(Node node) {

      Printer printer = Printer.getDefaultPrinter();

      PrinterJob printerJob = PrinterJob.createPrinterJob(printer);

      Paper paper = PrintHelper.createPaper("Roll80",80,590,Units.MM);

      PageLayout pageLayout = printerJob.getPrinter().createPageLayout(paper,PageOrientation.PORTRAIT,0);

      double height = node.getLayoutBounds().getHeight();

      System.out.println("Height: " + height);

      double scale = 0.791;

      node.getTransforms().add(new Scale(scale,scale));

      if (printerJob != null) {
          boolean success = printerJob.printPage(pageLayout,node);
          if (success) {
             printerJob.endJob();
             System.exit(0);
          }
      }

}

我在做什么不对？

解决方法

我终于用类似于@VGR的解决方案解决了这个问题。我希望这可以对可能遇到相同问题的人有所帮助。我只是使用StringBuilder类构造字符串并将其设置为标签，然后将标签作为节点返回。

在这里检查：

foo(c("A","B"),c(1,2))
# Error in integer(n) : invalid 'length' argument 

foo(data$string,data$number)
# Error in integer(n) : invalid 'length' argument