Java 如何使用ApachePOI将背景图像设置为中心

例如：

幻灯片尺寸：950 x 510

图像大小：500 x 4620

这是我的密码

XSLFPictureData idx = ppt.addPicture(file, pictureType);
CTBackgroundProperties bgPr = this.slide.getXmlObject().getCSld().addNewBg().addNewBgPr();
CTBlipFillProperties blipPr = bgPr.addNewBlipFill();
CTBlip blib = blipPr.addNewBlip();
CTRelativeRect ctRelativeRect = blipPr.addNewStretch().addNewFillRect();

double imgHeight =  idx.getImageDimensionInPixels().getHeight();
double imgWidth  =  idx.getImageDimensionInPixels().getWidth();
double pptHeight =  ppt.getPageSize().getHeight();
double pptWidth  =  ppt.getPageSize().getWidth();

if (pptHeight - imgHeight < 0) {
    //How to calculate the offset above and below the image
    ctRelativeRect.setT(?);
    ctRelativeRect.setB(?);
}else if(pptWidth - imgWidth < 0) {
    //
    ctRelativeRect.setR(?);
    ctRelativeRect.setL(?);
}

RelationPart rp = slide.addRelation(null, XSLFRelation.IMAGES, idx);
blib.setEmbed(rp.getRelationship().getId());

XSLFPictureData idx=ppt.addPicture（文件，pictureType）；
CTBackgroundProperties bgPr=this.slide.getXmlObject（）.getCSld（）.addNewBg（）.addNewBgPr（）；
CTBlipFillProperties bliprp=bgPr.addNewBlipFill（）；
CTBlip blib=bliprp.addNewBlip（）；
CtRelativect CtRelativect=bliprp.addNewStretch（）.addNewFillRect（）；
double imgHeight=idx.getImageDimensionInPixels（）.getHeight（）；
double imgWidth=idx.getImageDimensionInPixels（）.getWidth（）；
double-pptHeight=ppt.getPageSize（）.getHeight（）；
double-pptWidth=ppt.getPageSize（）.getWidth（）；
如果（pptHeight-Imghight<0）{
//如何计算图像上方和下方的偏移量
Ctrelativect.setT（？）；
相对立根（？）；
}else if（pptWidth-imgWidth<0）{
//
Ctrelativect.setR（？）；
Ctrelativect.setL（？）；
}
RelationPart rp=slide.addRelation（null，XSLFRelation.IMAGES，idx）；
setEmbed（rp.getRelationship（）.getId（））；

我不知道如何计算图像的偏移量，可以使其居中。 请给我一些建议

图为：

以下是我想要的效果：

if（灯光-灯光<0）{
//如何计算图像上方和下方的偏移量
//而不是双高度偏移=（pptHeight-imgHeight）/2
双高度偏移=（imghight-pptHeight）/2
Ctrelativect.setT（高度偏移）；
Ctrelativect.setB（高度偏移）；
}else if（pptWidth-imgWidth<0）{
双宽度偏移=（pptWidth-imgWidth）/2
Ctrelativect.setR（宽度偏移）；
Ctrelativect.setL（宽度偏移）；
}

Ctreativect被命名为相对，因为它的尺寸是以滑动高度和滑动宽度的百分比表示的。 您的长图像将被拉伸或压缩到这些维度。此外，所有左侧、右侧、顶部和底部的偏移量均以滑块高度和滑块宽度的百分比表示

从您想要的效果开始，图像将填满整个幻灯片宽度。因此，图片宽度将从500px扩展到950px。这是950/500的比率。在相同的比例下，高度也将被拉伸

要知道这一点，我们需要将图片尺寸从像素计算为幻灯片尺寸的百分比。知道了这一点，我们就可以将顶部偏移计算为（100%-图片高度%）/2。如果设置了相同的底部偏移，则长图片的正中间将显示在幻灯片背景中。如果顶部偏移量为（100%-图片高度单位%）/2）-100%，底部偏移量为（100%-图片高度单位%）/2+100%，则幻灯片背景显示长图片中间下方的1个幻灯片高度

除此之外，Microsoft总是将自己奇怪的测量单位考虑在内。由于避免了百分比的浮点数，这里的测量单位是千分之一

例如：

import java.io.FileOutputStream;
import java.io.FileInputStream;

import org.apache.poi.xslf.usermodel.*;
import org.apache.poi.sl.usermodel.*;

import org.openxmlformats.schemas.presentationml.x2006.main.*;
import org.openxmlformats.schemas.drawingml.x2006.main.*;

import java.awt.Dimension;

public class CreatePPTXSheetsBackgroundPicture {

 public static void main(String[] args) throws Exception {

  XMLSlideShow slideShow = new XMLSlideShow();
  XSLFPictureData pictureData = slideShow.addPicture(new FileInputStream("2hGsR.jpg"), PictureData.PictureType.JPEG);
  slideShow.setPageSize(new Dimension(950, 510));

  double imgHeight =  pictureData.getImageDimensionInPixels().getHeight();
  double imgWidth  =  pictureData.getImageDimensionInPixels().getWidth();
  double sildeHeight =  slideShow.getPageSize().getHeight();
  double slideWidth  =  slideShow.getPageSize().getWidth();

  //How to calculate the offset above and below the image
  // imgWidth stretched to slideWidth => ratio = slideWidth / imgWidth
  double ratio = slideWidth / imgWidth;
  // sildeHeight% = 100%
  // imgHeight% = (imgHeight * ratio) * 100% / sildeHeight
  double imgHeightPerCent = (imgHeight * ratio) * 100 / sildeHeight;
  // topMiddle% = (100% - imgHeight%) / 2
  // bottomMiddle% = (100% - imgHeight%) / 2
  // topMiddle+1slideHeight% = (100% - imgHeight%) / 2) - 100%
  // bottomMiddle+1slideHeight% = (100% - imgHeight%) / 2 + 100%
  // topMiddle-1slideHeight% = (100% - imgHeight%) / 2) + 100%
  // bottomMiddle-1slideHeight% = (100% - imgHeight%) / 2 - 100%

  // first slide
  XSLFSlide slide = slideShow.createSlide();
  CTBackgroundProperties backgroundProperties = slide.getXmlObject().getCSld().addNewBg().addNewBgPr();
  CTBlipFillProperties blipFillProperties = backgroundProperties.addNewBlipFill();
  CTRelativeRect ctRelativeRect = blipFillProperties.addNewStretch().addNewFillRect();

  // first slide shows 1 slide above middle of long picture
  // measurement unit is thousandth => percent * 1000
  int top = (int)Math.round(((100 - imgHeightPerCent) / 2 + 100) * 1000);
  int bottom = (int)Math.round(((100 - imgHeightPerCent) / 2 -100) * 1000);
  ctRelativeRect.setT(top);
  ctRelativeRect.setB(bottom);

  String idx = slide.addRelation(null, XSLFRelation.IMAGES, pictureData).getRelationship().getId();
  CTBlip blib = blipFillProperties.addNewBlip();
  blib.setEmbed(idx);

  // second slide
  slide = slideShow.createSlide();
  backgroundProperties = slide.getXmlObject().getCSld().addNewBg().addNewBgPr();
  blipFillProperties = backgroundProperties.addNewBlipFill();
  ctRelativeRect = blipFillProperties.addNewStretch().addNewFillRect();

  // second slide shows middle of long picture
  top = (int)Math.round(((100 - imgHeightPerCent) / 2) * 1000);
  bottom = (int)Math.round(((100 - imgHeightPerCent) / 2) * 1000);
  ctRelativeRect.setT(top);
  ctRelativeRect.setB(bottom);

  idx = slide.addRelation(null, XSLFRelation.IMAGES, pictureData).getRelationship().getId();
  blib = blipFillProperties.addNewBlip();
  blib.setEmbed(idx);

  // third slide
  slide = slideShow.createSlide();
  backgroundProperties = slide.getXmlObject().getCSld().addNewBg().addNewBgPr();
  blipFillProperties = backgroundProperties.addNewBlipFill();
  ctRelativeRect = blipFillProperties.addNewStretch().addNewFillRect();

  // third slide shows 1 slide below middle of long picture
  top = (int)Math.round(((100 - imgHeightPerCent) / 2 - 100) * 1000);
  bottom = (int)Math.round(((100 - imgHeightPerCent) / 2 + 100) * 1000);
  ctRelativeRect.setT(top);
  ctRelativeRect.setB(bottom);

  idx = slide.addRelation(null, XSLFRelation.IMAGES, pictureData).getRelationship().getId();
  blib = blipFillProperties.addNewBlip();
  blib.setEmbed(idx);


  FileOutputStream out = new FileOutputStream("CreatePPTXSheetsBackgroundPicture.pptx");
  slideShow.write(out);
  out.close();
 }
}

第二张幻灯片显示了您的长图片的中间部分，正如您想要的效果所述

提示：

---

整个效果只能使用PowerPoint查看<代码>印象无法显示该效果。而且

PowerPoint 2007

可以使用小于0%和/或大于100%的偏移量显示效果，但无法设置小于0%和/或大于100%的偏移量。

我尝试了很多算法，包括你的答案，但都无法达到我想要的效果。无论如何，谢谢。啊，我明白了，您只需在那里显示图像的中心即可！。然后它将是下一个：宽度应该像以前一样工作。至于高度，你应该把所有的东西都抵消掉，除了灯光。所以它就像|双高度偏移=（imghight-pptHeight）/2 CtrRelativect.setT（高度偏移）Ctrativect.setB（高度偏移）；哈哈，我又见到你了。再次解决了我的问题，谢谢你的回答和提示。

import java.io.FileOutputStream;
import java.io.FileInputStream;

import org.apache.poi.xslf.usermodel.*;
import org.apache.poi.sl.usermodel.*;

import org.openxmlformats.schemas.presentationml.x2006.main.*;
import org.openxmlformats.schemas.drawingml.x2006.main.*;

import java.awt.Dimension;

public class CreatePPTXSheetsBackgroundPicture {

 public static void main(String[] args) throws Exception {

  XMLSlideShow slideShow = new XMLSlideShow();
  XSLFPictureData pictureData = slideShow.addPicture(new FileInputStream("2hGsR.jpg"), PictureData.PictureType.JPEG);
  slideShow.setPageSize(new Dimension(950, 510));

  double imgHeight =  pictureData.getImageDimensionInPixels().getHeight();
  double imgWidth  =  pictureData.getImageDimensionInPixels().getWidth();
  double sildeHeight =  slideShow.getPageSize().getHeight();
  double slideWidth  =  slideShow.getPageSize().getWidth();

  //How to calculate the offset above and below the image
  // imgWidth stretched to slideWidth => ratio = slideWidth / imgWidth
  double ratio = slideWidth / imgWidth;
  // sildeHeight% = 100%
  // imgHeight% = (imgHeight * ratio) * 100% / sildeHeight
  double imgHeightPerCent = (imgHeight * ratio) * 100 / sildeHeight;
  // topMiddle% = (100% - imgHeight%) / 2
  // bottomMiddle% = (100% - imgHeight%) / 2
  // topMiddle+1slideHeight% = (100% - imgHeight%) / 2) - 100%
  // bottomMiddle+1slideHeight% = (100% - imgHeight%) / 2 + 100%
  // topMiddle-1slideHeight% = (100% - imgHeight%) / 2) + 100%
  // bottomMiddle-1slideHeight% = (100% - imgHeight%) / 2 - 100%

  // first slide
  XSLFSlide slide = slideShow.createSlide();
  CTBackgroundProperties backgroundProperties = slide.getXmlObject().getCSld().addNewBg().addNewBgPr();
  CTBlipFillProperties blipFillProperties = backgroundProperties.addNewBlipFill();
  CTRelativeRect ctRelativeRect = blipFillProperties.addNewStretch().addNewFillRect();

  // first slide shows 1 slide above middle of long picture
  // measurement unit is thousandth => percent * 1000
  int top = (int)Math.round(((100 - imgHeightPerCent) / 2 + 100) * 1000);
  int bottom = (int)Math.round(((100 - imgHeightPerCent) / 2 -100) * 1000);
  ctRelativeRect.setT(top);
  ctRelativeRect.setB(bottom);

  String idx = slide.addRelation(null, XSLFRelation.IMAGES, pictureData).getRelationship().getId();
  CTBlip blib = blipFillProperties.addNewBlip();
  blib.setEmbed(idx);

  // second slide
  slide = slideShow.createSlide();
  backgroundProperties = slide.getXmlObject().getCSld().addNewBg().addNewBgPr();
  blipFillProperties = backgroundProperties.addNewBlipFill();
  ctRelativeRect = blipFillProperties.addNewStretch().addNewFillRect();

  // second slide shows middle of long picture
  top = (int)Math.round(((100 - imgHeightPerCent) / 2) * 1000);
  bottom = (int)Math.round(((100 - imgHeightPerCent) / 2) * 1000);
  ctRelativeRect.setT(top);
  ctRelativeRect.setB(bottom);

  idx = slide.addRelation(null, XSLFRelation.IMAGES, pictureData).getRelationship().getId();
  blib = blipFillProperties.addNewBlip();
  blib.setEmbed(idx);

  // third slide
  slide = slideShow.createSlide();
  backgroundProperties = slide.getXmlObject().getCSld().addNewBg().addNewBgPr();
  blipFillProperties = backgroundProperties.addNewBlipFill();
  ctRelativeRect = blipFillProperties.addNewStretch().addNewFillRect();

  // third slide shows 1 slide below middle of long picture
  top = (int)Math.round(((100 - imgHeightPerCent) / 2 - 100) * 1000);
  bottom = (int)Math.round(((100 - imgHeightPerCent) / 2 + 100) * 1000);
  ctRelativeRect.setT(top);
  ctRelativeRect.setB(bottom);

  idx = slide.addRelation(null, XSLFRelation.IMAGES, pictureData).getRelationship().getId();
  blib = blipFillProperties.addNewBlip();
  blib.setEmbed(idx);


  FileOutputStream out = new FileOutputStream("CreatePPTXSheetsBackgroundPicture.pptx");
  slideShow.write(out);
  out.close();
 }
}