iText 5：创建包含2个背景颜色且文本重叠的PdfPcell

问题描述：

在java中使用iText5并且想要对PdfPcell的结果进行颜色编码，如下所示。例如，该表格包括2列和3行。iText 5：创建包含2个背景颜色且文本重叠的PdfPcell

人有一个想法如何做到这一点？

我能简单地设置使用

PdfPCell cell = new PdfPCell(new Phrase("60 Pass, 40 Fail", myStyle)); 
cell.setBackgroundColor(new BaseColor(0xff,0x0,0x0)); // red background

那么，做什么，一个绿色矩形添加到单元格的背景颜色？使用模板？不确定。

答

您可以通过单元事件侦听器完成这种“有趣”的单元特性。

E.g.为你的任务，你可以实现一个PdfPCellEvent这样的：

public class PercentileCellBackground implements PdfPCellEvent { 
    public PercentileCellBackground(float percent, BaseColor leftColor, BaseColor rightColor) { 
     this.percent = percent; 
     this.leftColor = leftColor; 
     this.rightColor = rightColor; 
    } 

    @Override 
    public void cellLayout(PdfPCell cell, Rectangle position, PdfContentByte[] canvases) { 
     PdfContentByte canvas = canvases[PdfPTable.BACKGROUNDCANVAS]; 

     float xTransition = position.getLeft() + (position.getRight() - position.getLeft()) * (percent/100.0f); 
     float yTransition = (position.getTop() + position.getBottom())/2f; 
     float radius = (position.getRight() - position.getLeft()) * 0.025f; 
     PdfShading axial = PdfShading.simpleAxial(canvas.getPdfWriter(), 
       xTransition - radius, yTransition, xTransition + radius, yTransition, leftColor, rightColor); 
     PdfShadingPattern shading = new PdfShadingPattern(axial); 

     canvas.saveState(); 
     canvas.setShadingFill(shading); 
     canvas.rectangle(position.getLeft(), position.getBottom(), position.getWidth(), position.getHeight()); 
     canvas.fill(); 
     canvas.restoreState(); 
    } 

    final float percent; 
    final BaseColor leftColor; 
    final BaseColor rightColor; 
}

（PercentileCellBackground）

然后，您可以使用此事件侦听器类是这样的：

Document document = new Document(); 
try (OutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "TableWithCellsWithPercentileBackground.pdf"))) { 
    PdfWriter.getInstance(document, os); 
    document.open(); 

    Font font = new Font(FontFamily.UNDEFINED, Font.UNDEFINED, Font.UNDEFINED, BaseColor.WHITE); 
    PdfPTable table = new PdfPTable(2); 
    table.setWidthPercentage(40); 
    PdfPCell cell = new PdfPCell(new Phrase("Group A")); 
    table.addCell(cell); 
    cell = new PdfPCell(new Phrase(new Chunk("60 Pass, 40 Fail", font))); 
    cell.setCellEvent(new PercentileCellBackground(60, BaseColor.GREEN, BaseColor.RED)); 
    table.addCell(cell); 
    cell = new PdfPCell(new Phrase("Group B")); 
    table.addCell(cell); 
    cell = new PdfPCell(new Phrase(new Chunk("70 Pass, 30 Fail", font))); 
    cell.setCellEvent(new PercentileCellBackground(70, BaseColor.GREEN, BaseColor.RED)); 
    table.addCell(cell); 
    cell = new PdfPCell(new Phrase("Group C")); 
    table.addCell(cell); 
    cell = new PdfPCell(new Phrase(new Chunk("50 Pass, 50 Fail", font))); 
    cell.setCellEvent(new PercentileCellBackground(50, BaseColor.GREEN, BaseColor.RED)); 
    table.addCell(cell); 
    document.add(table); 

    document.close(); 
}

（CellsWithPercentileBackground测试testCreateTableWithCellsWithPercentileBackground ）

结果看起来是这样的：

正如你所看到的，我用了一个阴影，使绿/红过渡不太苛刻。如果您想要更加苛刻，请在事件cellLayout方法中减小径向系数0.025f，或改为使用矩形绘图指令。

iText 5：创建包含2个背景颜色且文本重叠的PdfPcell

相关推荐