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Busy Developers' Guide to HSLF drawing layerBusy Developers' Guide to HSLF drawing layerIndex of Features
FeaturesNew Presentation//create a new empty slide show SlideShow ppt = new SlideShow(); //add first slide Slide s1 = ppt.createSlide(); //add second slide Slide s2 = ppt.createSlide(); //save changes in a file FileOutputStream out = new FileOutputStream("slideshow.ppt"); ppt.write(out); out.close(); How to retrieve or change slide sizeSlideShow ppt = new SlideShow(new HSLFSlideShow("slideshow.ppt")); //retrieve page size. Coordinates are expressed in points (72 dpi) java.awt.Dimension pgsize = ppt.getPageSize(); int pgx = pgsize.width; //slide width int pgy = pgsize.height; //slide height //set new page size ppt.setPageSize(new java.awt.Dimension(1024, 768)); //save changes FileOutputStream out = new FileOutputStream("slideshow.ppt"); ppt.write(out); out.close(); How to get shapes contained in a particular slideThe superclass of all shapes in HSLF is the Shape class - the elemental object that composes a drawing. The following pictute shows the class tree of HSLF shapes:
The following fragment demonstrates how to iterate over shapes for each slide. SlideShow ppt = new SlideShow(new HSLFSlideShow("slideshow.ppt")); //get slides Slide[] slide = ppt.getSlides(); for (int i = 0; i < slide.length; i++){ Shape[] sh = slide[i].getShapes(); for (int j = 0; j < sh.length; j++){ //name of the shape String name = sh[j].getShapeName(); //shapes's anchor which defines the position of this shape in the slide java.awt.Rectangle anchor = sh[j].getAnchor(); if (sh[j] instanceof Line){ Line line = (Line)sh[j]; //work with Line } else if (sh[j] instanceof AutoShape){ AutoShape shape = (AutoShape)sh[j]; //work with AutoShape } else if (sh[j] instanceof TextBox){ TextBox shape = (TextBox)sh[j]; //work with TextBox } else if (sh[j] instanceof Picture){ Picture shape = (Picture)sh[j]; //work with Picture } } } Drawing a shape on a slideWarning
To work with graphic objects HSLF uses Java2D classes
that may throw exceptions if graphical environment is not available. In case if graphical environment
is not available, you must tell Java that you are running in headless mode and
set the following system property: java.awt.headless=true
(either via -Djava.awt.headless=true startup parameter or via System.setProperty("java.awt.headless", "true")).
When you add a shape, you usually specify the dimensions of the shape and the position of the upper left corner of the bounding box for the shape relative to the upper left corner of the slide. Distances in the drawing layer are measured in points (72 points = 1 inch). SlideShow ppt = new SlideShow(); Slide slide = ppt.createSlide(); //Line shape Line line = new Line(); line.setAnchor(new java.awt.Rectangle(50, 50, 100, 20)); line.setLineColor(new Color(0, 128, 0)); line.setLineStyle(Line.LINE_DOUBLE); slide.addShape(line); //TextBox TextBox txt = new TextBox(); txt.setText("Hello, World!"); txt.setAnchor(new java.awt.Rectangle(300, 100, 300, 50)); //use RichTextRun to work with the text format RichTextRun rt = txt.getTextRun().getRichTextRuns()[0]; rt.setFontSize(32); rt.setFontName("Arial"); rt.setBold(true); rt.setItalic(true); rt.setUnderlined(true); rt.setFontColor(Color.red); rt.setAlignment(TextBox.AlignRight); slide.addShape(txt); //Autoshape //32-point star AutoShape sh1 = new AutoShape(ShapeTypes.Star32); sh1.setAnchor(new java.awt.Rectangle(50, 50, 100, 200)); sh1.setFillColor(Color.red); slide.addShape(sh1); //Trapezoid AutoShape sh2 = new AutoShape(ShapeTypes.Trapezoid); sh2.setAnchor(new java.awt.Rectangle(150, 150, 100, 200)); sh2.setFillColor(Color.blue); slide.addShape(sh2); FileOutputStream out = new FileOutputStream("slideshow.ppt"); ppt.write(out); out.close(); How to work with picturesCurrently, HSLF API supports the following types of pictures:
SlideShow ppt = new SlideShow(new HSLFSlideShow("slideshow.ppt")); //extract all pictures contained in the presentation PictureData[] pdata = ppt.getPictureData(); for (int i = 0; i < pdata.length; i++){ PictureData pict = pdata[i]; // picture data byte[] data = pict.getData(); int type = pict.getType(); String ext; switch (type){ case Picture.JPEG: ext=".jpg"; break; case Picture.PNG: ext=".png"; break; case Picture.WMF: ext=".wmf"; break; case Picture.EMF: ext=".emf"; break; case Picture.PICT: ext=".pict"; break; default: continue; } FileOutputStream out = new FileOutputStream("pict_"+i + ext); out.write(data); out.close(); } // add a new picture to this slideshow and insert it in a new slide int idx = ppt.addPicture(new File("clock.jpg"), Picture.JPEG); Picture pict = new Picture(idx); //set image position in the slide pict.setAnchor(new java.awt.Rectangle(100, 100, 300, 200)); Slide slide = ppt.createSlide(); slide.addShape(pict); //now retrieve pictures containes in the first slide and save them on disk slide = ppt.getSlides()[0]; Shape[] sh = slide.getShapes(); for (int i = 0; i < sh.length; i++){ if (sh[i] instanceof Picture){ Picture pict = (Picture)sh[i]; PictureData pictData = pict.getPictureData(); byte[] data = pictData.getData(); int type = pictData.getType(); if (type == Picture.JPEG){ FileOutputStream out = new FileOutputStream("slide0_"+i+".jpg"); out.write(data); out.close(); } else if (type == Picture.PNG){ FileOutputStream out = new FileOutputStream("slide0_"+i+".png"); out.write(data); out.close(); } } } FileOutputStream out = new FileOutputStream("slideshow.ppt"); ppt.write(out); out.close(); How to set slide titleSlideShow ppt = new SlideShow(); Slide slide = ppt.createSlide(); TextBox title = slide.addTitle(); title.setText("Hello, World!"); //save changes FileOutputStream out = new FileOutputStream("slideshow.ppt"); ppt.write(out); out.close(); Below is the equivalent code in PowerPoint VBA: Set myDocument = ActivePresentation.Slides(1) myDocument.Shapes.AddTitle.TextFrame.TextRange.Text = "Hello, World!" How to modify background of a slide masterSlideShow ppt = new SlideShow(); SlideMaster master = ppt.getSlidesMasters()[0]; Fill fill = master.getBackground().getFill(); int idx = ppt.addPicture(new File("background.png"), Picture.PNG); fill.setFillType(Fill.FILL_PICTURE); fill.setPictureData(idx); How to modify background of a slideSlideShow ppt = new SlideShow(); Slide slide = ppt.createSlide(); //This slide has its own background. //Without this line it will use master's background. slide.setFollowMasterBackground(false); Fill fill = slide.getBackground().getFill(); int idx = ppt.addPicture(new File("background.png"), Picture.PNG); fill.setFillType(Fill.FILL_PATTERN); fill.setPictureData(idx); How to modify background of a shapeSlideShow ppt = new SlideShow(); Slide slide = ppt.createSlide(); Shape shape = new AutoShape(ShapeTypes.Rectangle); shape.setAnchor(new java.awt.Rectangle(100, 100, 200, 200)); Fill fill = shape.getFill(); fill.setFillType(Fill.FILL_SHADE); fill.setBackgroundColor(Color.red); fill.setForegroundColor(Color.green); slide.addShape(shape); How to create bulleted listsSlideShow ppt = new SlideShow(); Slide slide = ppt.createSlide(); TextBox shape = new TextBox(); RichTextRun rt = shape.getTextRun().getRichTextRuns()[0]; shape.setText( "January\r" + "February\r" + "March\r" + "April"); rt.setFontSize(42); rt.setBullet(true); rt.setBulletOffset(0); //bullet offset rt.setTextOffset(50); //text offset (should be greater than bullet offset) rt.setBulletChar('\u263A'); //bullet character slide.addShape(shape); shape.setAnchor(new java.awt.Rectangle(50, 50, 500, 300)); //position of the text box in the slide slide.addShape(shape); FileOutputStream out = new FileOutputStream("bullets.ppt"); ppt.write(out); out.close(); How to read hyperlinks from a slide showFileInputStream is = new FileInputStream("slideshow.ppt"); SlideShow ppt = new SlideShow(is); is.close(); Slide[] slide = ppt.getSlides(); for (int j = 0; j < slide.length; j++) { //read hyperlinks from the text runs TextRun[] txt = slide[j].getTextRuns(); for (int k = 0; k < txt.length; k++) { String text = txt[k].getText(); Hyperlink[] links = txt[k].getHyperlinks(); if(links != null) for (int l = 0; l < links.length; l++) { Hyperlink link = links[l]; String title = link.getTitle(); String address = link.getAddress(); String substring = text.substring(link.getStartIndex(), link.getEndIndex()-1); //in ppt end index is inclusive } } //in PowerPoint you can assign a hyperlink to a shape without text, //for example to a Line object. The code below demonstrates how to //read such hyperlinks Shape[] sh = slide[j].getShapes(); for (int k = 0; k < sh.length; k++) { Hyperlink link = sh[k].getHyperlink(); if(link != null) { String title = link.getTitle(); String address = link.getAddress(); } } } |