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Fig. 10.1Editing block properties: the Textflowpanel is only visible if textflow=true;the Tabs panel is only visible ifhortabmethod=rulerrestrain the positioning to horizontal and vertical movements. This may be useful forexactly aligning blocks. When the pointer is located near a block corner, the pointer willchange to an arrow and you can resize the block. To adjust the position or size of multipleblocks, select two or more blocks and use the Align, Center, Distribute, or Size commandsfrom the PDFlib Blocks menu or the context menu. The position of one or moreblocks can also be changed by using the arrow keys.Alternatively, you can enter numerical block coordinates in the properties dialog.The origin of the coordinate system is in the upper left corner of the page. The coordinateswill be displayed in the unit which is currently selected in Acrobat:> To change the display units in Acrobat 7/8/9 proceed as follows: go to Edit, Preferences,[General...], Units & Guides and choose one of Points, Inches, Millimeters, Picas,Centimeters. In Acrobat 7/8 you can alternatively go to View, Navigation Tabs, Infoand select a unit from the Options menu.> To display cursor coordinates use View, Cursor Coordinates in Acrobat 9 or View, NavigationTabs, Info in Acrobat 7/8.Note that the chosen unit will only affect the Rect property, but not any other numericalproperties.Creating blocks by selecting an image or graphic. As an alternative to manually draggingblock rectangles you can use existing page contents to define the block size. First,make sure that the menu item PDFlib Blocks, Click Object to define Block is enabled. Nowyou can use the block tool to click on an image on the page in order to create a blockwith the size of the image. You can also click on other graphical objects, and the blocktool will try to select the surrounding graphic (e.g., a logo). The Click Object feature is intendedas an aid for defining blocks. If you want to reposition or resize the block you cando so afterwards without any restriction. The block will not be locked to the image orgraphics object which was used as a positioning and sizing aid.The Click Object feature will try to recognize which vector graphics and images form alogical element on the page. When some page content is clicked, its bounding box (thesurrounding rectangle) will be selected unless the object is white or very large. In the10.3 Using the PDFlib Block Plugin to create Blocks 231