IText 7中的多行文本拟合
IText 7中的多行文本拟合
提问于 2021-06-14 15:49:56
这个问题是this在上一篇文章之后的后续，我创建了以下方法，适合段落中某些空格中的文本。
public static void getPlainFill2(String str, Document doc, PdfDocument document, Paragraph root,
Paragraph space, boolean isCentred) {
// System.out.println("prevText: "+prev.getText());
float width = doc.getPageEffectiveArea(PageSize.A4).getWidth();
float height = doc.getPageEffectiveArea(PageSize.A4).getHeight();
if (str.isEmpty() || str.isBlank()) {
str = "________";
}
IRenderer spaceRenderer = space.createRendererSubTree().setParent(doc.getRenderer());
LayoutResult spaceResult = spaceRenderer
.layout(new LayoutContext(new LayoutArea(1, new Rectangle(width, height))));
Rectangle rectSpaceBox = ((ParagraphRenderer) spaceRenderer).getOccupiedArea().getBBox();
float writingWidth = rectSpaceBox.getWidth();
float writingHeight = rectSpaceBox.getHeight();
Rectangle remaining = doc.getRenderer().getCurrentArea().getBBox();
float yReal = remaining.getTop() + 2f;// orig 4f
float sizet = 0;
for (int i = 0; i < root.getChildren().size(); i++) {
IElement e = root.getChildren().get(i);
if (e.equals(space)) {
break;
}
IRenderer ss = e.createRendererSubTree().setParent(doc.getRenderer());
LayoutResult ss2 = ss.layout(new LayoutContext(new LayoutArea(1, new Rectangle(width, height))));
sizet += ss.getOccupiedArea().getBBox().getWidth();
System.out.println("width: " + width + " current: " + sizet);
}
float start = sizet+doc.getLeftMargin();
if(isCentred)
start = (width - getRealWidth(doc, root,width,height))/2+doc.getLeftMargin()+sizet;
Rectangle towr = new Rectangle(start, yReal, writingWidth, writingHeight);// sizet+doc.getLeftMargin()
PdfCanvas pdfcanvas = new PdfCanvas(document.getFirstPage());
Canvas canvas = new Canvas(pdfcanvas, towr);
canvas.setTextAlignment(TextAlignment.CENTER);
canvas.setHorizontalAlignment(HorizontalAlignment.CENTER);
Paragraph paragraph = new Paragraph(str).setTextAlignment(TextAlignment.CENTER).setBold();//.setMultipliedLeading(0.9f);
Div lineDiv = new Div();
lineDiv.setVerticalAlignment(VerticalAlignment.MIDDLE);
lineDiv.add(paragraph);
float fontSizeL = 1f;
float fontSizeR = 12;
int adjust = 0;
while (Math.abs(fontSizeL - fontSizeR) > 1e-1) {
float curFontSize = (fontSizeL + fontSizeR) / 2;
lineDiv.setFontSize(curFontSize);
// It is important to set parent for the current element renderer to a root
// renderer
IRenderer renderer = lineDiv.createRendererSubTree().setParent(canvas.getRenderer());
LayoutContext context = new LayoutContext(new LayoutArea(1, towr));
if (renderer.layout(context).getStatus() == LayoutResult.FULL) {
// we can fit all the text with curFontSize
fontSizeL = curFontSize;
} else {
fontSizeR = curFontSize;
}
if(adjust>=2) {
writingHeight -=1.3f;
yReal += 1.4f;
adjust= 0;
}
}
lineDiv.setFontSize(fontSizeL);
canvas.add(lineDiv);
// border
// PdfCanvas(document.getFirstPage()).rectangle(towr).setStrokeColor(ColorConstants.BLACK).stroke();
canvas.close();
}
public static float getRealWidth (Document doc, Paragraph root,float width,float height) {
float sizet = 0;
for(int i = 0;i<root.getChildren().size();i++) {
IElement e = root.getChildren().get(i);
IRenderer ss = e.createRendererSubTree().setParent(doc.getRenderer());
LayoutResult ss2 = ss.layout(new LayoutContext(new LayoutArea(1, new Rectangle(width,height))));
sizet +=ss.getOccupiedArea().getBBox().getWidth();
}
return sizet;}现在，这几乎很不错，当文本缩放到较低的大小时，会出现一些小问题，比如：https://i.ibb.co/MkxfwjQ/Screenshot-from-2021-06-14-18-27-09.png (我不能发布图片，因为我没有代表)。但主要的问题是，你必须逐行写段落才能工作。下一个例子是：
Cell cell3 = new Cell();
LineCountingParagraph line3 = new LineCountingParagraph("");
Text ch07 = new Text("Paragraph Prev ");
line3.add(ch07);
Paragraph nrZile = getEmptySpace(15);
line3.add(nrZile);
Text ch08 = new Text("afterStr, textasdsadasdas ");
line3.add(ch08);
Paragraph data = getEmptySpace(18);
line3.add(data);
Text ch09 = new Text(".\n");
line3.add(ch09);
line3.setTextAlignment(TextAlignment.CENTER);
cell3.add(line3);
doc.add(cell3);
getPlainFill2("thisisalongstring", doc, document, line3, nrZile, true);
getPlainFill2("1333", doc, document, line3, data, true);
Cell cell4 = new Cell();
LineCountingParagraph line4 = new LineCountingParagraph("");
Paragraph loc2 = getEmptySpace(30);
line4.add(loc2);
Text pr32 = new Text(" aasdbsadasd ");
line4.add(pr32);
Paragraph nr2 = getEmptySpace(8);
line4.add(nr2);
Text pr33 = new Text(" asdasdasdasd.\n");
line4.add(pr33);
line4.setTextAlignment(TextAlignment.CENTER);
cell4.add(line4);
doc.add(cell4);
getPlainFill2("1333", doc, document, line4, nr2, true);如果你需要更多代码，我会把它上传到某个地方。现在是否有办法在同一段中多行插入文本？因为我似乎找不到一种方法来检测IText 7.1.11中的行中断。
完整代码：
package pdfFill;
import java.io.File;
import java.io.IOException;
import com.itextpdf.kernel.colors.ColorConstants;
import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.Canvas;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Cell;
import com.itextpdf.layout.element.Div;
import com.itextpdf.layout.element.IElement;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Text;
import com.itextpdf.layout.layout.LayoutArea;
import com.itextpdf.layout.layout.LayoutContext;
import com.itextpdf.layout.layout.LayoutResult;
import com.itextpdf.layout.property.HorizontalAlignment;
import com.itextpdf.layout.property.TextAlignment;
import com.itextpdf.layout.property.VerticalAlignment;
import com.itextpdf.layout.renderer.DrawContext;
import com.itextpdf.layout.renderer.IRenderer;
import com.itextpdf.layout.renderer.ParagraphRenderer;
public class Newway4 {
public static void main(String[] args) {
PdfWriter writer;
try {
writer = new PdfWriter(new File("test4.pdf"));
PdfDocument document = new PdfDocument(writer);
document.getDocumentInfo().addCreationDate();
document.getDocumentInfo().setAuthor("Piri");
document.getDocumentInfo().setTitle("Test_Stackoverflow");
document.setDefaultPageSize(PageSize.A4);
Document doc = new Document(document);
doc.setFontSize(12);
final Paragraph titlu = new Paragraph();
final Text t1 = new Text("\n\n\n\nTest Stackoverflow\n\n\n").setBold().setUnderline();
titlu.setHorizontalAlignment(HorizontalAlignment.CENTER);
titlu.setTextAlignment(TextAlignment.CENTER);
titlu.add(t1).setBold();
doc.add(titlu);
Cell cell1 = new Cell();
LineCountingParagraph line1 = new LineCountingParagraph("");
line1.add( addTab());
Text ch01 = new Text("This is the 1st example ");
line1.add(ch01);
Paragraph name = getEmptySpace(42);
line1.add(name);// cnp new line
Text ch02 = new Text(" that works ");
line1.add(ch02);
Paragraph domiciliu = getEmptySpace(63);
line1.add(domiciliu);
/* Text ch03 = new Text("\njudet");
line1.add(ch03);
Paragraph judet = getEmptySpace(12);
line1.add(judet);*/
Text ch031 = new Text("\n");
line1.add(ch031);
cell1.add(line1);
doc.add(cell1);
getPlainFill2("with insertion str", doc, document, line1, name, false);
getPlainFill2("because is writtin line by line", doc, document, line1, domiciliu, false);
Cell cell2 = new Cell();
LineCountingParagraph line2 = new LineCountingParagraph("");
Text p51 = new Text("as you can see in this");
line2.add(p51);
Paragraph localitatea = getEmptySpace(30);
line2.add(localitatea);
Text p7 = new Text(" and ");
line2.add(p7);
Paragraph nrCasa =getEmptySpace(8);
line2.add(nrCasa);
Text p09 = new Text(" of text scalling ");
line2.add(p09);
Paragraph telefon = getEmptySpace(22);
line2.add(telefon);
Text p11 = new Text(".");
line2.add(p11);
line2.setTextAlignment(TextAlignment.CENTER);
cell2.add(line2);
doc.add(cell2);
getPlainFill2("sentence", doc, document, line2, localitatea, true);
getPlainFill2("example", doc, document, line2, nrCasa, true);
getPlainFill2("text scalling bla bla", doc, document, line2, telefon, true);
doc.add(new Paragraph("\n\n\n"));
LineCountingParagraph paragraphTest = new LineCountingParagraph("");
paragraphTest.add(addTab());
Text testch01 = new Text("This is the 2nd example ");
paragraphTest.add(testch01);
Paragraph emptyTest01 = getEmptySpace(42);
paragraphTest.add(emptyTest01);
Text testch02 = new Text(" that doesn't work ");
paragraphTest.add(testch02);
Paragraph emptyTest02 = getEmptySpace(53);
paragraphTest.add(emptyTest02);
Text testch04 = new Text(" this next goes to the next line but ");
paragraphTest.add(testch04);
Paragraph emptyTest03 = getEmptySpace(42);
paragraphTest.add(emptyTest03);
Text testch05 = new Text(" won't appear !!");
paragraphTest.add(testch05);
doc.add(paragraphTest);
getPlainFill2("with insertion str", doc, document, paragraphTest, emptyTest01, false);
getPlainFill2("because next text goes next line", doc, document, paragraphTest, emptyTest02, false);
getPlainFill2("this text", doc, document, paragraphTest, emptyTest03, false);
doc.close();
writer.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static String getStrWithDots(final int dots, final String str) {
final int strSize = str.length();
final StringBuilder sb = new StringBuilder();
int dotsRemained;
if (strSize > dots) {
dotsRemained = 0;
} else {
dotsRemained = dots - strSize;
}
for (int i = 0; i < dotsRemained; ++i) {
if (i == dotsRemained / 2) {
sb.append(str);
}
sb.append(".");
}
return sb.toString();
}
public static void getPlainFill2(String str, Document doc, PdfDocument document, Paragraph root,
Paragraph space, boolean isCentred) {
// System.out.println("prevText: "+prev.getText());
float width = doc.getPageEffectiveArea(PageSize.A4).getWidth();
float height = doc.getPageEffectiveArea(PageSize.A4).getHeight();
if (str.isEmpty() || str.isBlank()) {
str = "________";
}
IRenderer spaceRenderer = space.createRendererSubTree().setParent(doc.getRenderer());
LayoutResult spaceResult = spaceRenderer
.layout(new LayoutContext(new LayoutArea(1, new Rectangle(width, height))));
Rectangle rectSpaceBox = ((ParagraphRenderer) spaceRenderer).getOccupiedArea().getBBox();
float writingWidth = rectSpaceBox.getWidth();
float writingHeight = rectSpaceBox.getHeight();
Rectangle remaining = doc.getRenderer().getCurrentArea().getBBox();
float yReal = remaining.getTop() + 2f;// orig 4f
float sizet = 0;
for (int i = 0; i < root.getChildren().size(); i++) {
IElement e = root.getChildren().get(i);
if (e.equals(space)) {
break;
}
IRenderer ss = e.createRendererSubTree().setParent(doc.getRenderer());
LayoutResult ss2 = ss.layout(new LayoutContext(new LayoutArea(1, new Rectangle(width, height))));
sizet += ss.getOccupiedArea().getBBox().getWidth();
}
float start = sizet+doc.getLeftMargin();
if(isCentred)
start = (width - getRealWidth(doc, root,width,height))/2+doc.getLeftMargin()+sizet;
Rectangle towr = new Rectangle(start, yReal, writingWidth, writingHeight);// sizet+doc.getLeftMargin()
PdfCanvas pdfcanvas = new PdfCanvas(document.getFirstPage());
Canvas canvas = new Canvas(pdfcanvas, towr);
canvas.setTextAlignment(TextAlignment.CENTER);
canvas.setHorizontalAlignment(HorizontalAlignment.CENTER);
Paragraph paragraph = new Paragraph(str).setTextAlignment(TextAlignment.CENTER).setBold();//.setMultipliedLeading(0.9f);//setbold oprtional
Div lineDiv = new Div();
lineDiv.setVerticalAlignment(VerticalAlignment.MIDDLE);
lineDiv.add(paragraph);
float fontSizeL = 0.0001f, fontSizeR= 10000;
int adjust = 0;
while (Math.abs(fontSizeL - fontSizeR) > 1e-1) {
float curFontSize = (fontSizeL + fontSizeR) / 2;
lineDiv.setFontSize(curFontSize);
// It is important to set parent for the current element renderer to a root
// renderer
IRenderer renderer = lineDiv.createRendererSubTree().setParent(canvas.getRenderer());
LayoutContext context = new LayoutContext(new LayoutArea(1, towr));
if (renderer.layout(context).getStatus() == LayoutResult.FULL) {
// we can fit all the text with curFontSize
fontSizeL = curFontSize;
if (++adjust>1)
towr.setHeight(towr.getHeight()-0.90f);
} else {
fontSizeR = curFontSize;
}
}
lineDiv.setFontSize(fontSizeL);
canvas.add(lineDiv);
new PdfCanvas(document.getFirstPage()).rectangle(towr).setStrokeColor(ColorConstants.BLACK).stroke();
canvas.close();
}
public static Text addTab() {
StringBuilder sb = new StringBuilder();
for(int i = 0;i<8;i++)
sb.append("\u00a0");
return new Text(sb.toString());
}
public static float getRealWidth (Document doc, Paragraph root,float width,float height) {
float sizet = 0;
for(int i = 0;i<root.getChildren().size();i++) {
IElement e = root.getChildren().get(i);
IRenderer ss = e.createRendererSubTree().setParent(doc.getRenderer());
LayoutResult ss2 = ss.layout(new LayoutContext(new LayoutArea(1, new Rectangle(width,height))));
sizet +=ss.getOccupiedArea().getBBox().getWidth();
}
return sizet;
}
private static Paragraph getEmptySpace(int size) {
Paragraph space = new Paragraph();
space.setMaxWidth(size);
for(int i=0;i<size;i++) {
// par.add("\u00a0");
space.add("\u00a0");
}
return space;
}
private static class LineCountingParagraph extends Paragraph {
private int linesWritten = 0;
public LineCountingParagraph(String text) {
super(text);
}
public void addWrittenLines(int toAdd) {
linesWritten += toAdd;
}
public int getNumberOfWrittenLines() {
return linesWritten;
}
@Override
protected IRenderer makeNewRenderer() {
return new LineCountingParagraphRenderer(this);
}
}
private static class LineCountingParagraphRenderer extends ParagraphRenderer {
public LineCountingParagraphRenderer(LineCountingParagraph modelElement) {
super(modelElement);
}
@Override
public void drawChildren(DrawContext drawContext) {
((LineCountingParagraph)modelElement).addWrittenLines(lines.size());
super.drawChildren(drawContext);
}
@Override
public IRenderer getNextRenderer() {
return new LineCountingParagraphRenderer((LineCountingParagraph) modelElement);
}
}
}问题:在PDF的上半部分，您可以看到创建两个LineCountingParagraph实例的结果，每一行一个。在PDF的下半部分，您可以看到只创建一个LineCountingParagraph实例时的结果。因此，如果段落的内容被包装到下一行，将文本放在方框中并不能很好地工作。
回答 1
Stack Overflow用户
回答已采纳
发布于 2021-07-01 19:18:21
你有一些不必要复杂的事情，所以我们必须从头开始:)
因此，的目标是能够创建带有固定宽度的带框侵入的段落，在其中我们需要复制适合(放置)一些文本，确保字体大小的选择能够使文本适合到该框中。
结果应该类似于这张图片：
我们的想法是将固定宽度的段落添加到主要段落中(iText允许添加块元素，段落是块元素-段落)。固定的宽度将由我们的段落内容保证-它将只包含不可破坏的空间。我们的段落实际上将由另一个段落支持，我们希望在包装段落中加入实际内容。在包装段落的布局中，我们将知道它的有效边界，我们将使用该区域来确定内容段落的正确字体大小，使用二进制搜索算法。一旦确定了正确的字体大小，我们将确保包含内容的段落被绘制在包装段落的旁边。
我们包装段落的代码非常简单。它只是期望底层段落以实际内容作为参数。与iText布局一样，我们应该自定义自动标号段落的呈现器：
private static class AutoScalingParagraph extends Paragraph {
Paragraph innerParagraph;
public AutoScalingParagraph(Paragraph innerParagraph) {
this.innerParagraph = innerParagraph;
}
@Override
protected IRenderer makeNewRenderer() {
return new AutoScalingParagraphRenderer(this);
}
}
private static class AutoScalingParagraphRenderer extends ParagraphRenderer {
private IRenderer innerRenderer;
public AutoScalingParagraphRenderer(AutoScalingParagraph modelElement) {
super(modelElement);
}
@Override
public LayoutResult layout(LayoutContext layoutContext) {
LayoutResult baseResult = super.layout(layoutContext);
this.innerRenderer = ((AutoScalingParagraph)modelElement).innerParagraph.createRendererSubTree().setParent(this);
if (baseResult.getStatus() == LayoutResult.FULL) {
float fontSizeL = 0.0001f, fontSizeR= 10000;
while (Math.abs(fontSizeL - fontSizeR) > 1e-1) {
float curFontSize = (fontSizeL + fontSizeR) / 2;
this.innerRenderer.setProperty(Property.FONT_SIZE, UnitValue.createPointValue(curFontSize));
if (this.innerRenderer.layout(new LayoutContext(getOccupiedArea().clone())).getStatus() == LayoutResult.FULL) {
// we can fit all the text with curFontSize
fontSizeL = curFontSize;
} else {
fontSizeR = curFontSize;
}
}
this.innerRenderer.setProperty(Property.FONT_SIZE, UnitValue.createPointValue(fontSizeL));
this.innerRenderer.layout(new LayoutContext(getOccupiedArea().clone()));
}
return baseResult;
}
@Override
public void drawChildren(DrawContext drawContext) {
super.drawChildren(drawContext);
innerRenderer.draw(drawContext);
}
@Override
public IRenderer getNextRenderer() {
return new AutoScalingParagraphRenderer((AutoScalingParagraph) modelElement);
}
}现在，我们添加了帮助函数，用于创建包装器段落，这些段落在空格中只接受所需的段落宽度，以及我们希望插入到该空间中的基本内容：
private static Paragraph createAdjustableParagraph(int widthInSpaces, Paragraph innerContent) {
AutoScalingParagraph paragraph = new AutoScalingParagraph(innerContent);
paragraph.setBorder(new SolidBorder(1));
StringBuilder sb = new StringBuilder();
for(int i=0;i<widthInSpaces;i++) {
sb.append("\u00a0");
}
paragraph.add(sb.toString());
return paragraph;
}最后，主要代码：
PdfWriter writer = new PdfWriter(new File("test4.pdf"));
PdfDocument document = new PdfDocument(writer);
Document doc = new Document(document);
Paragraph paragraphTest = new Paragraph();
Text testch01 = new Text("This is the 2nd example ");
paragraphTest.add(testch01);
paragraphTest.add(createAdjustableParagraph(42, new Paragraph("with insertion str")));
Text testch02 = new Text(" that doesn't work ");
paragraphTest.add(testch02);
paragraphTest.add(createAdjustableParagraph(53, new Paragraph("because next text goes next line")));
Text testch04 = new Text(" this next goes to the next line but ");
paragraphTest.add(testch04);
paragraphTest.add(createAdjustableParagraph(42, new Paragraph("this text")));
Text testch05 = new Text(" won't appear !!");
paragraphTest.add(testch05);
doc.add(paragraphTest);
doc.close();这给了我们以下结果：
因此，我们只有一个主要段落，其中包含一些内容和我们的段落包装，在tern中有我们想要适应的基本内容。
提示:以文本为中心很容易，不需要计算坐标等。只需将正确的属性设置为段落，并将内容提供给包装器段落：
paragraphTest.add(createAdjustableParagraph(42, new Paragraph("this text").setTextAlignment(TextAlignment.CENTER)));你得到的结果：
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/67973438
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