iText 5:创建包含2种背景颜色且文本重叠的PdfPcell [英] iText 5: create PdfPcell containing 2 background colors with text overlap
问题描述
在java中使用iText5并想要对PdfPcell的结果进行颜色编码,如下所示。例如,该表包括2列和3行。
任何人都知道如何实现这一目标?
我可以简单地设置背景颜色
PdfPCell cell =新的PdfPCell(新短语(60 Pass,40 Fail,myStyle));
cell.setBackgroundColor(new BaseColor(0xff,0x0,0x0)); //红色背景
然后,做什么,在单元格中添加绿色矩形?使用模板?不确定。
您可以通过单元格事件监听器来完成这些有趣的单元格功能。
例如对于您的任务,您可以实现 PdfPCellEvent
,如下所示:
public class PercentileCellBackground实现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着色= new PdfShadingPattern(轴向);
canvas.saveState();
canvas.setShadingFill(着色);
canvas.rectangle(position.getLeft(),position.getBottom(),position.getWidth(),position.getHeight());
canvas.fill();
canvas.restoreState();
}
最终浮动百分比;
final BaseColor leftColor;
final BaseColor rightColor;
}
(
正如您所看到的,我使用阴影来使绿色/红色过渡不那么刺耳。如果你想要它更苛刻,在事件 cellLayout
方法中减小半径系数 0.025f
或在其中使用矩形绘图说明相反。
Using iText5 in java and want to color-code a PdfPcell's results as shown below. The table includes 2 columns and 3 rows, for example.
Anyone have an idea how to accomplish this?
Could I simply set the background color using
PdfPCell cell = new PdfPCell(new Phrase("60 Pass, 40 Fail", myStyle));
cell.setBackgroundColor(new BaseColor(0xff,0x0,0x0)); // red background
then, do what, add a green rectangle to the cell? Use a template? Not sure.
You can accomplish such "interesting" cell features by means of cell event listeners.
E.g. for your task you can implement a PdfPCellEvent
like this:
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;
}
You can then use this event listener class like this:
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 test testCreateTableWithCellsWithPercentileBackground
)
The result looks like this:
As you can see, I used a shading to make the green/red transition less harsh. If you want it more harsh, reduce the radius factor 0.025f
in the event cellLayout
method or use rectangle drawing instructions therein instead.
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