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Generarea unui Rezultat

Figure_composer_output_1 prezintă un exemplu de așezare în pagină în Compozitorul de Hărți, inclusiv fiecare tip de element de hartă descris în secțiunea anterioară.

Figure Composer Output 1:

../../../_images/print_composer_complete.png

Compozitorul de Hărți, căruia i s-au adăugat vizualizarea hărții, legenda, o imagine, o scară, coordonate, un text și un cadru HTML

Before printing a layout you have the possibility to view your composition without bounding boxes. This can be enabled by deactivating View –> checkbox Show bounding boxes or pressing the shortcut Ctrl+Shift+B.

Compozitorul de Hărți vă permite să creați mai multe formate de ieșire, fiind posibilă definirea rezoluției (calitatea imprimării) și a dimensiunilor hârtiei:

  • The filePrint Print icon allows you to print the layout to a connected printer or a PostScript file, depending on installed printer drivers.
  • The saveMapAsImage Export as image icon exports the Composer canvas in several image formats, such as PNG, BPM, TIF, JPG,...
  • The saveAsSVG Export as SVG icon saves the Print Composer canvas as an SVG (Scalable Vector Graphic).
  • The saveAsPDF Export as PDF icon saves the defined Print Composer canvas directly as a PDF.

Exportare ca imagine

Clicking the saveMapAsImage Export as image icon will ask you to enter the filename to use to export composition: in case of multi-page composition, each page will be exported to a file with the given name appended with the page number.

You can then override the print resolution (set in Composition tab) and resize exported image dimensions.

Prin bifarea opțiunii checkbox Decupare în funcție de conținut, imaginea generată de compozitor va include doar suprafața compoziției care are un conținut. Există, de asemenea, o opțiune de adăugare a unor margini în jurul limitelor elementelor, dacă este necesar.

În cazul în care compoziția include o singură pagină, atunci ieșirea va fi dimensionată pentru a include TOTUL în compoziție. Dacă este o compoziție pe mai multe pagini, atunci fiecare pagină va fi decupată pentru a include din acea pagină numai zona cu elemente.

Figure Composer Output 2:

../../../_images/image_export_options.png

Opțiuni de Export ale Imaginii

If you need to export your layout as a georeferenced image (e.g., to share with other projects), you need to enable this feature under the Composition tab. Check checkbox World file on and choose the map item to use. With this option, the ‘Export as image’ action will create a world file along the exported image.

Note

Exportul rasterelor mari poate eșua uneori, chiar dacă pare a exista suficientă memorie. Aceasta este, de asemenea, o problemă de management a rasterelor, care ține de Qt.

Exportare ca SVG

With saveAsSVG Export as SVG, you also need to fill the filename (used as a basename for all files in case of multi_page composition) and then can apply checkbox Crop to content option.

În plus, dialogul opțiunilor de export vă permit :

  • exportarea straturilor hărții ca grupuri svg:

  • randarea etichetelor hărții ca și contururi

Figure Composer Output 3:

../../../_images/svg_export_options.png

Opțiuni de Export SVG

Note

În prezent, producerea SVG-ului este foarte simplă. Aceasta nu ține de QGIS, ci de biblioteca Qt de la bază. Acest lucru se va schimba, sperăm, în versiunile viitoare.

Exportare ca PDF

saveAsPDF Exportare ca PDF exportă toată compoziția într-un singur fișier PDF.

If you applied to your composition or any shown layer an advanced effect such as blend modes, transparency or symbol effects, these cannot be printed as vectors and your effects may be lost. Checking Print as a raster in Composition tab helps to keep the effects but rasterize the composition. Note that the Force layer to render as raster in the Rendering tab of Layer Properties is a layer-level alternative that avoids global composition rasterization.

Generarea unui Atlas

The Print Composer includes generation functions that allow you to create map books in an automated way. The concept is to use a coverage layer, which contains geometries and fields. For each geometry in the coverage layer, a new output will be generated where the content of some canvas maps will be moved to highlight the current geometry. Fields associated with this geometry can be used within text labels.

Every page will be generated with each feature. To enable the generation of an atlas and access generation parameters, refer to the Atlas generation tab. This tab contains the following widgets (see figure_composer_atlas_1):

Figure Composer Atlas 1:

../../../_images/atlas_properties.png

Fila de generare a atlasului

  • checkbox Generare atlas, care activează sau dezactivează generarea atlasului.

  • A Coverage layer selectString combo box that allows you to choose the (vector) layer containing the features on which to iterate over.
  • An optional checkbox Hidden coverage layer that, if checked, will hide the coverage layer (but not the other ones) during the generation.
  • An optional Page name combo box to give a more explicit name to each feature page(s) when previewing atlas. You can select an attribute of the coverage layer or set an expression. If this option is empty, QGIS will use an internal ID, according to the filter and/or the sort order applied to the layer.
  • An optional Filter with text area that allows you to specify an expression for filtering features from the coverage layer. If the expression is not empty, only features that evaluate to True will be selected. The button on the right allows you to display the expression builder.
  • An optional checkbox Sort by that, if checked, allows you to sort features of the coverage layer. The associated combo box allows you to choose which column will be used as the sorting key. Sort order (either ascending or descending) is set by a two-state button that displays an up or a down arrow.

De asemenea, aveți opțiuni de setare a ieșirii atlasului:

  • An Output filename expression textbox that is used to generate a filename for each geometry if needed. It is based on expressions. This field is meaningful only for rendering to multiple files.
  • A checkbox Single file export when possible that allows you to force the generation of a single file if this is possible with the chosen output format (PDF, for instance). If this field is checked, the value of the Output filename expression field is meaningless.

You can use multiple map items with the atlas generation; each map will be rendered according to the coverage features. To enable atlas generation for a specific map item, you need to check checkboxControlled by Atlas under the item properties of the map item. Once checked, you can set:

  • A radioButtonOn Margin around feature that allows you to select the amount of space added around each geometry within the allocated map. Its value is meaningful only when using the auto-scaling mode.
  • O radioButtonOff Scară predefinită (cea mai bună încadrare). Aceasta va utiliza cea mai bună opțiune de încadrare, din lista de scări predefinite în proprietățile proiectului dvs. (a se vedea Proiect –> Proprietățile Proiectului –> General –> Scările Proiectului pentru a configura aceste scări predefinite).

  • A radioButtonOff Fixed scale that allows you to toggle between auto-scale and fixed-scale mode. In fixed-scale mode, the map will only be translated for each geometry to be centered. In auto-scale mode, the map’s extents are computed in such a way that each geometry will appear in its entirety.

Etichete

In order to adapt labels to the feature the atlas plugin iterates over, you can include expressions. What you should take care of is to place expression part (including functions, fields or variables) between [% and %]. For example, for a city layer with fields CITY_NAME and ZIPCODE, you could insert this:

The area of [% upper(CITY_NAME) || ',' || ZIPCODE || ' is '
format_number($area/1000000,2) %] km2

sau, o altă combinație:

The area of [% upper(CITY_NAME)%],[%ZIPCODE%] is
[%format_number($area/1000000,2) %] km2

The information [% upper(CITY_NAME) || ',' || ZIPCODE || ' is ' format_number($area/1000000,2) %] is an expression used inside the label. both expressions would result in the generated atlas as:

The area of PARIS,75001 is 1.94 km2

Butoane de Suprascriere Definită de Date

There are several places where you can use a dataDefined Data Defined Override button to override the selected setting. These options are particularly useful with Atlas Generation.

For the following examples the Regions layer of the QGIS sample dataset is used and selected for Atlas Generation. We also assume the paper format A4 (210X297) is selected in the Composition tab for field Presets.

With a Data Defined Override button you can dynamically set the paper orientation. When the height (north-south) of the extents of a region is greater than its width (east-west), you rather want to use portrait instead of landscape orientation to optimize the use of paper.

In the Composition you can set the field Orientation and select Landscape or Portrait. We want to set the orientation dynamically using an expression depending on the region geometry. Press the dataDefined button of field Orientation, select Edit... so the Expression string builder dialog opens. Enter the following expression:

CASE WHEN bounds_width($atlasgeometry) > bounds_height($atlasgeometry)
THEN 'Landscape' ELSE 'Portrait' END

Now the paper orients itself automatically. For each Region you need to reposition the location of the composer item as well. For the map item you can use the dataDefined button of field Width to set it dynamically using following expression:

(CASE WHEN bounds_width($atlasgeometry) > bounds_height($atlasgeometry)
THEN 297 ELSE 210 END) - 20

Folosiți butonul dataDefined al câmpului Înălțime pentru a obține următoarea expresie:

(CASE WHEN bounds_width($atlasgeometry) > bounds_height($atlasgeometry)
THEN 210 ELSE 297 END) - 20

When you want to give a title above the map in the center of the page, insert a label item above the map. First use the item properties of the label item to set the horizontal alignment to radioButtonOn Center. Next activate from Reference point the upper middle checkbox. You can provide the following expression for field X :

(CASE WHEN bounds_width($atlasgeometry) > bounds_height($atlasgeometry)
THEN 297 ELSE 210 END) / 2

For all other composer items you can set the position in a similar way so they are correctly positioned when the page is automatically rotated in portrait or landscape.

Information provided is derived from the excellent blog (in English and Portuguese) on the Data Defined Override options Multiple_format_map_series_using_QGIS_2.6 .

Acesta este doar un exemplu despre cum se pot utiliza opțiunile de Înlocuire Definită de Date.

Previzualizare și generare

Figure Composer Atlas 2:

../../../_images/atlas_preview.png

Bara instrumentelor de previzualizare a atlasului

Once the atlas settings have been configured and composer items (map, table, image...) linked to it, you can create a preview of all the pages by clicking Atlas ‣ Preview Atlas or atlas Preview Atlas icon. You can then use the arrows in the same toolbar to navigate through all the features:

  • atlasFirst Prima entitate

  • atlasPrev Entitatea anterioară

  • atlasNext Următoarea entitate

  • atlasLast Ultima entitate

You can also use the combo box to directly select and preview a specific feature. The combo box shows atlas features name according to the expression set in the atlas Page name option.

As for simple compositions, an atlas can be generated in different ways (see Generarea unui Rezultat for more information). Instead of Composer menu, rather use tools from Atlas menu or Atlas toolbar.

This means that you can directly print your compositions with Atlas ‣ Print Atlas. You can also create a PDF using Atlas ‣ Export Atlas as PDF...: The user will be asked for a directory to save all the generated PDF files, except if the checkbox Single file export when possible has been selected. In that case, you’ll be prompted to give a filename.

With Atlas ‣ Export Atlas as Images... or Atlas ‣ Export Atlas as SVG... tool, you’re also prompted to select a folder. Each page of each atlas feature composition is exported to an image or SVG file.

Tip

Imprimă o entitate specifică a atlasului

If you want to print or export the composition of only one feature of the atlas, simply start the preview, select the desired feature in the drop-down list and click on Composer ‣ Print (or export... to any supported file format).