The print composer provides growing layout and printing capabilities. It allowsyou to add elements such as the QGIS map canvas, text labels, images, legends, scalebars, basicshapes, arrows, attribute tables and HTML frames. You can size, group, align and position eachelement and adjust the properties to create your layout. The layout can be printedor exported to image formats, Postscript, PDF or to SVG (export to SVG is notworking properly with some recent Qt4 versions, you should try and checkindividual on your system). You can save the layout as template and load it againin another session. Finally, generating several maps based on a template can be done throught the Atlas generatorSee a list of tools in table_composer_1:
- Picture Instruments Mask Integrator 2 0 10 Km Transmission
- Picture Instruments Mask Integrator 2.0.10
Icon | Purpose | Icon | Purpose |
---|---|---|---|
Save Project | New Composer | ||
Duplicate Composer | Composer Manager | ||
Load from template | Save as template | ||
Export to an image format | Export as PDF | ||
Export print composition to SVG | Print or export as Postscript | ||
Zoom to full extent | Zoom in | ||
Zoom out | Refresh view | ||
Revert last change | Restore last change | ||
Add new map from QGIS map canvas | Add image to print composition | ||
Add label to print composition | Add new legend to print composition | ||
Add new scalebar to print composition | Add basic shape to print composition | ||
Add arrow to print composition | Add attribute table to print composition | ||
Add a HTML Frame | |||
Select/Move item in print composition | Move content within an item | ||
Group items of print composition | Ungroup items of print composition | ||
Raise selected items | Lower selected items | ||
Move selected items to top | Move selected items to bottom | ||
Align selected items left | Align selected items right | ||
Align selected items center | Align selected items center vertical | ||
Align selected items top | Align selected items bottom |
Chroma Mask You take the pictures and have Chroma Mask extract the photographed subjects 'on the fly' while also removing the color spill. Picture Instruments Mask Integrator 2.0.10 破解版 – 拍摄照片时提取对象. « Picture Instruments Chroma Mask 2.0.10 破解版 – 遮罩和剪切软件. FevIR Scan 2 Elevated Temperature Screening & Face Mask Detection Why FevIR Scan? FevIR Scan 2 elevated temperature screening system and face mask detection is ideal for high speed individual screening of high pedestrian areas such as airports, transport systems, manufacturing plants, factories, schools and other public venues.
Table Composer 1: Print Composer Tools
- 0.55: each: 145236RS78: Purple Cabbage This 5' purple cabbage has silk leaves with a coating to make it shiny & durable. Very realistic looking! 0.75: each: 14531RS29: Peach This peach is made of foam on the inside and is fuzzy on the outside. 0.50: each: 145503GRS12: Celery Stalk - Green This celery stalk is 15' tall and has five.
- Fully upgradeable. Add the instruments and performance you need now - or later. Key performance specifications 1. Oscilloscope 2 and 4 analog channel models 1 GHz, 500 MHz, 350 MHz, 200 MHz, 100 MHz bandwidth models Bandwidth is upgradable (up to 1 GHz) Up to 5 GS/s sample rate 10 M record length on all channels 280,000 wfm/s maximum waveform.
- Picture Instruments Mask Integrator 2.0.10. Picture Instruments Mask Integrator 2.0.10 تحميل.
All Print Composer tools are available in menus and as icons in a toolbar. Thetoolbar can be switched off and on using the right mouse button over the toolbar.
First steps¶
Open a new Print Composer Template¶
Before you start to work with the print composer, you need to load some rasterand vector layers in the QGIS map canvas and adapt their properties to suit yourown convenience. After everything is rendered and symbolized to your liking,click the New Print Composer icon in the toolbar orchoose File ‣ New Print Composer. You will be prompt tochoose a title for the new composer.
Using Print Composer¶
Opening the print composer provides you with a blank canvas to which you can addthe current QGIS map canvas, text labels, images, legends, scalebars, basicshapes, arrows, attribute tables and HTML frames. Figure_composer_1 shows the initial view of the print composer with anactivated Snap to grid mode but before any elements areadded.
Figure Composer 1:
The print composer provides four tabs:
- The Composition tab allows you to set paper size, orientation, theprint quality for the output file in dpi and to activate snapping to a grid ofa defined resolution. You can also choose the Number of pages your composition will have.Please note, the Snap to gridfeature only works, if you define a grid resolution > 0. Furthermore you canalso activate the Print as raster checkbox. This meansall elements will be rastered before printing or saving as Postscript or PDF.
- The Item Properties tab displays the properties for the selecteditem element. Click the Select/Move item icon to selectan element (e.g. legend, scalebar or label) on the canvas. Then click theItem Properties tab and customize the settings for the selectedelement.
- The Command history tab (hidden by default) displays a history of all changes appliedto the print composer layout. With a mouse click it is possible to undo andredo layout steps back and forth to a certain status.
- The Atlas generation tab allows to enable the generation of anatlas for the current composer and gives access to its parameters.
You can add multiple elements to the composer. It is also possible to have morethan one map view or legend or scalebar in the print composer canvas, on one orseveral pages. Each element has its own properties and in the case of the map,its own extent. If you want to remove any elements from the composer canvas youcan do that with the Delete or the Backspace key.
Navigation tools¶
To navigate in the canvas layout, the print composer provides 4 general tools:
- Zoom in
- Zoom out
- Zoom to full extend
- Refresh the view (if you find the view in an inconsistentstate)
Composition tab — General composition setup¶
In the Composition tab, you can define the global settings of your composition.
- You can choose one of the Presets for your papersheet, or enter your custom width and height.
- Composition can now be parted on several pages. For instance, a first page can show a map canvas and a secondpage will show the attribute table associated to a layer while a third ons shows a HTML frame linking to your organization website.Set the Number of pages to the desired value.
- Choose the page Orientation and its Exported resolution
- When checked, the print as raster means all elements will be rasterized before printing or saving as Postscript orPDF.
- Snap to grid and Snap to alignements tools make accomplishing some tasks much easier. There’s three types of grid:Dots, Solid lines and Crosses. You can adjust spacings, offsets and color to your need.
- Selection tolerance defines the maximum distance below which an item is snapped to the grid.
- Snap to alignements shows helping lines when the borders or axis of two items are aligned.
Composer items general options¶
Composer items have a set of common properties you will find on the bottom of the Item Properties tab: Position and size, Frame,Background, Item ID and Rendering (See figure_composer_2)
Figure Composer 2:
- The Position and size dialog lets you define size and position of the frame that contains the item. You can also choosewhich Reference point will be set at the X and Y coordinates previously defined.
- The Frame shows or hides the frame around the label.Click on the [Color] and [Thickness] buttons to adjust those properties.
- the Background enables or disables a background color.Click on the [Color...] button to display a dialog where you pick a color ou choose frome a custom setting.Transparency can also be adjusted throught the alpha field.
- Use the Item ID to create a relationship to other print composer items.
- Rendering mode can be selected in the option field. See Rendering_Mode .
Rendering mode¶
QGIS now allows advanced rendering for composer items just like vector and raster layers.
Figure Composer 3:
- Transparency : you can make the underlying item in the composervisible with this tool. Use the slider to adapt the visibility of your item to your needs.You can also make a precise definition of the percentage of visibility in the the menu beside the slider.
- Blending mode: you can achieve special rendering effects with these tools that youpreviously only know from graphics programs. The pixels of your overlaying and underlaying items are mixedthrough the settings described below.
- Normal: This is the standard blend mode which uses the alpha channel of the top pixel to blend with the Pixel beneath it; the colors aren’t mixed
- Lighten: It selects the maximum of each component from the foreground and background pixels. Be aware that the results tend to be jagged and harsh.
- Screen: Light pixels from the source are painted over the destination, while dark pixels are not. This mode is most useful for mixing the texture of one layer with another layer. E.g. you can use a hillshade to texture another layer
- Dodge: Dodge will brighten and saturate underlying pixels based on the lightness of the top pixel. So brighter top pixels cause the saturation and brightness of the underlying pixels to increase. This works best if the top pixels aren’t too bright, otherwise the effect is too extreme.
- Addition: This blend mode simply adds pixel values of one layer with the other. In case of values above 1 (in the case of RGB), white is displayed. This mode is suitable for highlighting features.
- Darken: Creates a resultant pixel that retains the smallest components of the foreground and background pixels. Like lighten, the results tend to be jagged and harsh
- Multiply: It multiplies the numbers for each pixel of the top layer with the corresponding pixel for the bottom layer. The results are darker pictures.
- Burn: Darker colors in the top layer causes the underlying layers to darken. Can be used to tweak and colorise underlying layers.
- Overlay: Combines multiply and screen blending modes. In the resulting picture light parts of the picture become lighter and dark parts become darker.
- Soft light: Very similar to overlay, but instead of using multiply/screen it uses color burn/dodge. This one is supposed to emulate shining a soft light onto an image.
- Hard light: Hard light is very similar to the overlay mode. It’s supposed to emulate projecting a very intense light onto an image.
- Difference: Difference subtracts the top pixel from the bottom pixel or the other way round, to always get a positive value. Blending with black produces no change, as values for all colors are 0.
- Subtract: This blend mode simply subtracts pixel values of one layer with the other. In case of negative values, black is displayed.
Composer Items¶
Adding a current QGIS map canvas to the Print Composer¶
Click on the Add new map toolbar button in the printcomposer toolbar to add the QGIS map canvas. Now drag a rectangle on the composercanvas with the left mouse button to add the map. To display the current map, youcan choose between three different modes in the map Item Propertiestab:
- Rectangle is the default setting. It only displays an empty box with amessage ‘Map will be printed here’.
- Cache renders the map in the current screen resolution. If case you zoomin or out the composer window, the map is not rendered again but the image willbe scaled.
- Render means, that if you zoom in or out the composer window, the map willbe rendered again, but for space reasons, only up to a maximum resolution.
Cache is default preview mode for newly added print composer maps.
You can resize the map element by clicking on the Select/Move item button, selecting the element, and dragging one of theblue handles in the corner of the map. With the map selected, you can now adaptmore properties in the map Item Properties tab.
To move layers within the map element select the map element, click theMove item content icon and move the layers withinthe map element frame with the left mouse button. After you found the right placefor an element, you can lock the element position within the print composercanvas. Select the map element and click on the right mouse button to Lock the element position and again to unlock the element. You can lockthe map element also activating the Lock layers for mapitem checkbox in the Map dialog of the Item Propertiestab.
Main properties¶
The Main properties dialog of the map Item Properies tab providesfollowing functionalities (see figure_composer_4):
Figure Composer 4:
- The Preview area allows to define the preview modes ‘Rectangle’, ‘Cache’and ‘Render’, as described above. If you change the view on the QGIS map canvas by zooming or panning or changingvector or raster properties, you can update the print composer view selecting themap element in the print composer and clicking the [Update preview] button.
- The field Scale sets a manual scale.
- The field Rotation allows torotate the map element content clockwise in degrees. Note, a coordinate framecan only be added with the default value 0.
- The Draw map canvas items lets you show annotations that may be placed on the map canvas in the main QGIS window.
- You can choose to lock the layers shown on a map item. Check the Lock layers for map item. Any layer that would bedisplayed or hidden in the main QGIS window after checked on won’t appear or be hidden in the map item of the composer. But style andlabels of a locked layer is still refreshed accordingly to the main QGIS interface.
Extents¶
The Extents dialog of the map item tab provides followingfunctionalities (see Figure figure_composer_5):
Figure Composer 5:
- The Map extent area allow to specify the map extent using Y and X min/maxvalues or clicking the [Set to map canvas extent] button.
If you change the view on the QGIS map canvas by zooming or panning or changingvector or raster properties, you can update the print composer view selectingthe map element in the print composer and clicking the [Update preview] buttonin the map Item Properties tab (see Figure figure_composer_2).
Grid¶
The Grid dialog of the map Item Properties tab providesfollowing functionalities (see Figure_composer_6):
Figure Composer 6:
- The Show grid checkbox allows to overlay a grid to themap element. As grid type you can specify to use solid line or cross. Symbology ofthe grid can be chosen. See Section Rendering_Mode.Furthermore you can define an interval in X and Y direction, an X and Y offset,and the width used for cross or line grid type.
- You can choose to paint the frame with a Zebra style. If not selected, general frame option is used (See Section Frame_dialog)Advanced rendering mode is also available for grids. See Section Rendering_mode)
- The Draw coordinates checkbox allows to add coordinatesto the map frame. The annotation can be drawn inside or outside the map frame.The annotation direction can be defined as horizontal, vertical, horizontal andvertical, or boundary direction, for each border individually. Units can be in meters or in degrees. Finally you can define the gridcolor, the annotation font, the annotation distance from the map frame and the precision of the drawn coordinates.
Overview¶
The Overview dialog of the map Item Properties tab providesfollowing functionalities (see Figure_composer_7):
Figure Composer 7:
If the composer has more than one map, you can choose to use a map to show the extents of a second map.The Overview dialog of the map Item Properties tab allows to customize the appearance of that feature.
- The Overview frame combolist references the map item whose extents will be drawn on the present map item.
- The Overview Style allows to change the frame color. See Section vector_style_manager .
- The Overview Blend mode allows different transparency blend modes, to enhance visibility of the frame. See Rendering_Mode
- If checked, the Invert overview creates a mask around the extents : the referenced map extents are shown clearlywhereas everything else is blended with the frame color.
Adding a Label item to the Print Composer¶
To add a label, click the Add label icon, place the elementwith the left mouse button on the print composer canvas and position and customizeits appearance in the label Item Properties tab.
The Item Properties tab of a Label item provides following functionalities:
Figure Composer 8:
Main properties¶
The Main properties dialog of the Label Item Properties tab providesfollowing functionalities (see Figure_composer_9):
Figure Composer 9:
- The Main properties dialog is where is inserted the text (html or not) or the expression needed to fill the label added to the composercanvas.
- Labels can be interpreted as html code: check the Render as HTML. You can now insert a url, an clickableimage that link to a web page or something more complex.
- You can also insert an expression. Click on the [Insert an expression] to open a new dialog. Build an expression by clicking thefunctions available in the left side of the panel. On the right side of the Insert an expression dialog is displayed the help fileassociated with the function selected. Two special categories can be useful, particularly associted with the Atlas functionnality :geometry functions and records functions. On the bottom side, a preview of the expression is shown.
- Define font and font color by clicking on the [Font] and [Font color...] buttons
Alignment and Display¶
The Alignment and Display dialogs of the Label Item Properties tab providefollowing functionalities (see Figure_composer_10):
Figure Composer 10:
- You can define the horizontal and vertical alignment in the Alignment zone
- In the Display tag, you can define a margin in mm and/or a rotation angle in degrees for the text.
Adding an Image item to the Print Composer¶
To add an image, click the Add image icon, place the elementwith the left mouse button on the print composer canvas and position and customizeits appearance in the image Item Properties tab.
The image Item Properties tab provides following functionalities (see figure_composer_11):
Figure Composer 11:
Main properties, Search directories and Rotation¶
The Main properties and Search directories dialogs of the Image Item Properties tab providefollowing functionalities (see Figure_composer_12):
Figure Composer 12:
Image Main properties, Search directories and Rotation Dialogs
- The Main properties dialog shows the current image that is displayed in the image item.Click on the [...] button to select a file on your computer.
- This dialog shows all pictures stored in the selected directories.
- The Search directories area allows to add and remove directories withimages in SVG format to the picture database.
- Image can be rotate, with the Rotation field.
- Activating the Sync withmap checkbox synchronizes the rotation of a picture in the QGIS map canvas(i.e. a rotated north arrow) with the appropriate print composer image.
Adding a Legend item to the Print Composer¶
To add a map legend, click the Add new legend icon,place the element with the left mouse button on the print composer canvas andposition and customize their appearance in the legend Item Propertiestab.
The Item properties of a legend item tab provides followingfunctionalities (see figure_composer_14):
Figure Composer 13:
Main properties¶
The Main properties dialog of the legend Item Properties tabprovides following functionalities (see figure_composer_14):
Figure Composer 14:
- Here you can adapt the legend title.
- Choose which Map item the current legend will refer to in the select list.
- Since QGIS 1.8, you can wrap the text of the legend title to a given character.
Legend items¶
The Legend items dialog of the legend Item Properties tabprovides following functionalities (see figure_composer_15):
Figure Composer 15:
- The legend items window lists all legend items and allows to change item order,group layers, remove and restore items of the list, edit layer names. After changing thesymbology in the QGIS main window you can click on [Update] to adapt thechanges in the legend element of the print composer. The item order can bechanged using the [Up] and [Down] buttons or with ‘drag and drop’functionality.
- The feature count for each vector layer can be shown by enable the [Sigma] button.
- Legend can be updated automatically, Auto-update is checked.
Fonts, Columns, Symbol and Spacing¶
The Fonts, Columns, Symbol and Spacing dialogs of the legend Item Properties tabprovide following functionalities (see figure_composer_16):
Figure Composer 16:
Legend Fonts, Columns, Symbol and Spacing Dialogs
- You can change the font of the legend title, group, subgroup and item (layer) in the legend item. Click on a category button to open aSelect font dialog.
- All those items will get the same Color
- Legend items can be arranged in several columns. Select the correct value in the Count field.
- The Equal columns widths sets how legend columns should be adjusted.
- The Split layers option allows a categorized or a graduated layer legend to be divided upon columns.
- You can change width and height of the legend symbol in this dialog.
- Spacing aroung title, group, subgroup, symbol, icon label, box space or column space can be customized throught that dialog.
Adding a Scalebar item to the Print Composer¶
To add a scalebar, click the Add new scalebar icon, placethe element with the left mouse button on the print composer canvas and positionand customize their appearance in the scalebar Item Properties tab.
The Item properties of a scalebar item tab provides followingfunctionalities (see figure_composer_17):
Figure Composer 17:
Main properties¶
The Main properties dialog of the scalebar Item Properties tabprovides following functionalities (see figure_composer_18):
Figure Composer 18:
- First choose the map the scalebar will be attached to.
- then choose the style of your scalebar. Six styles are available :
- Single box and Double box styles which contain one or two lines of boxes alternating colors,
- Middle, Up or Down line ticks,
- Numeric : the scale ratio is printed, i.e. 1:50000.
Units and Segments¶
The Units and Segments dialogs of the scalebar Item Properties tabprovide following functionalities (see figure_composer_19):
Figure Composer 19:
In those two dialogs, you can set how the scalebar will be represented.
- Select the map units used. There’s three possible choices : Map Units is the automated unitselection, Meters or Feet force unit conversions.
- The Label field defines the text used to describe the unit of the scalebar.
- The Map units per bar unit allows to fix the ratio between a map unit and its representation in the scalebar.
- You can define how many Segments will be drawn on the left and on the right side of the scalebar,and how long will be each segment (Size field). Height can also be defined.
Display, Fonts and colors¶
The Display and Fonts and colors dialogs of the scalebar Item Properties tab provide following functionalities (see figure_composer_20):
Figure Composer 20:
- You can define how the scalebar will be displayed in its frame. Adjust the Box margin between text and frame borders,Labels margin between text and scalebar drawing and the Line width of the scalebar drawing.
- The Alignment in the Display dialog only applies to Numeric styled scalebars and puts text on theleft, middle or right side of the frame.
Adding a Basic shape or Arrow item to the Print Composer¶
It is possible to add basic shapes (Ellipse, Rectangle, Triangle) and arrowsto the print composer canvas : click the Add basic shape icon or theAdd Arrow icon, place the element with the left mouse button on the print composer canvas and positionand customize their appearance in the Item Properties tab.
The Shape Item properties tab allows to draw an ellipse, rectangle, or trianglein the print composer canvas. You can define its outline and fill color, theoutline width and a clockwise rotation.
Figure Composer 21:
![Picture Picture](https://picture-instruments.com/products/3_mask_integrator/screenshots/02_mask.jpg)
The Arrow Item properties tab allows to draw an arrow in the print composer canvas.You can define color, outline and arrow width and it is possible to use a defaultmarker and no marker and a SVG marker. For the SVG marker you can additionallyadd a SVG start and end marker from a directory on your computer.
Figure Composer 22:
Arrow Item properties Tab
Main properties¶
- For Basic shapes, this dialog allows you to choose a Ellipse, Rectangle or Triangle shape and its rotation.
- Unlike the other items, line style, line color and background color of a basic shape are adjusted with the Frame and Background dialog.No frame is drawn.
- For arrows, you can define here the line style : Color, Line width and Arrow head width.
- Arrows markers can be adjusted. If you want to set a SVG Start marker and/or End marker, browse toyour SVG file by clicking on the [...] button after selecting SVG radio button.
Note
Unlike other items, background color for a basic shape is the shape background and not the frame one.
Add attribute table values to the Print Composer¶
It is possible to add parts of a vector attribute table to the print composercanvas : click the Add attribute table icon, place the element with the left mouse button on the print composercanvas and position and customize their appearance in the Item Properties tab.
The Item properties of a attribute table item tab provides followingfunctionalities (see figure_composer_23):
Figure Composer 23:
Main properties, Show grid and Fonts¶
The Main properties, Show grid and Fonts dialogs of the attribute table Item Properties tabprovide following functionalities (see figure_composer_24):
Figure Composer 24:
Attribute table Main properties, Show grid and Fonts Dialog
Figure Composer 25:
Attribute table Select attributes Dialog
- The Table dialog allows to select the vector layer and columns of the attribute table. Attribute columns can be sorted and youcan define to show its values ascending or descending (see figure_composer_25).
- You can choose to display only the attribute of features visibled on a map. Check Show only visible features andselect the corresponding Composer map to filter.
- You can define the Maximum number of rows to be displayed and margin around text.
- Additionally you can define the grid characteristics of the table (Stroke width and Color of the grid) and theheader and content font.
Add a HTML frame to the Print Composer¶
It is possible to add a clickable frame, linked to an URL : click the Add html frame icon, place the element withthe left mouse button on the print composer canvas and position and customize their appearance in the Item Properties tab.
Main properties¶
The Main properties dialog of the HTML frame Item Properties tabprovides following functionalities (see figure_composer_26):
Figure Composer 26:
- Point the URL field to the URL or the HTML file you want to insert in the composer.
- You can adjust the rendering of that page with the Resize mode.
- Use existing frames constraints the page inside its first frame or in the frame created with the next settings.
- Extent to next page will create as many frames (and their pages) as necessary to render the height of the webpage. Each frame can bemoved around on the layout. If you resize a frame, the webpage will be divided up upon the other frames. The last frame will be trimmed tofit the webpage.
- Repeat on every page will first repeat the upper left of the webpage on every page, in same sized frames.
- Repeat until finished will also create as many frames as the Extend to next page option, except All frames will have the samesize.
Item alignment¶
Raise or lower functionalities for elements are inside the Raise selected items pulldown menu. Choose an element on the print composercanvas and select the matching functionality to raise or lower the selectedelement compared to the other elements (see table_composer_1).
Figure Composer 27:
Picture Instruments Mask Integrator 2 0 10 Km Transmission
There are several alignment functionalities available within the Align selected items pulldown menu (see table_composer_1). To use analignment functionality , you first select some elements and then click on thematching alignment icon. All selected will then be aligned within to their commonbounding box.When moving items on the composer canvas, alignment helper lines appear when borders, centers or corners are aligned.
Revert and Restore tools¶
During the layout process it is possible to revert and restore changes. This canbe done with the revert and restore tools:
- Revert last changes
- Restore last changes
or by mouse click within the Command history tab (see figure_composer_28).
Figure Composer 28:
Atlas generation¶
The print composer includes generation functions that allow to create map booksin an automated way. The concept is to use a coverage layer, which containsgeometries and fields. For each geometry in the coverage layer, a new outputwill be generated where the content of some canvas maps will be moved tohighlight the current geometry. Fields associated to this geometry can be usedwithin text labels.
![Mask Mask](https://i.ytimg.com/vi/Wum8Sc1TmMw/maxresdefault.jpg)
There can only be one atlas map by print composer but this one can contain multiple pages.Every pages will be generated with each feature. To enable the generationof an atlas and access generation parameters, refer to the Atlas generationtab. This tab contains the following widgets (see Figure_composer_29):
Figure Composer 29:
- A Generate an atlas enables or disables the atlas generation.
- A combobox Composer map that allows to choosewhich map item will be used as the atlas map, i.e. on which map geometries fromthe coverage layer will be iterated over and displayed.
- A combobox Coverage layer that allows to choose the(vector) layer containing the geometries on which to iterate over.
- An optional Hidden coverage layer, that if checked, willhide the coverage layer (but not the other ones) during the generation.
- An optional Features sorting that, if checked, allows tosort features of the coverage layer. The associated combobox allows to choosewhich column will be used as the sorting key. Sort order (either ascending ordescending) is set by a two-state button that displays an up or a down arrow.
- An optional Feature filtering text area that allows to specify anexpression for filtering features from the coverage layer. If the expressionis not empty, only features that evaluate to True will be selected. Thebutton on the right allows to display the expression builder.
- An input box Scaling that allows to select the amountof space added around each geometry within the allocated map. Its value ismeaningful only when using the autoscaling mode.
- A Fixed scale that allows to toggle between auto-scaleand fixed-scale mode. In fixed scale mode, the map will only be translated foreach geometry to be centered. In auto-scale mode, the map’s extents are computedin such a way that each geometry will appear in its whole.
- An Output filename expression textbox that is used to generate afilename for each geometry if needed. It is based on expressions. This field ismeaningful only for rendering to multiple files.
- A Single file export when possible that allows to forcethe generation of a single file if this is possible by the chosen output format(PDF for instance). If this field is checked, the value of theOutput filename expression field is meaningless.
Picture Instruments Mask Integrator 2.0.10
In order to adapt labels to the feature the atlas plugin iterates over, use a label with this special notation[%expression using field_name%].For example, with 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’ %]“
And that would result in the generated atlas as
“The area of PARIS,75001 is 1.94 km2”.
Generation¶
The atlas generation is done when the user asks for a print or an export. The behaviour of these functions will be slightly changed if an atlas map has been selected. For instance, when the user asks for an export to PDF, if an atlas map is defined, the user will be asked for a directory where to save all the generated PDF files (except if the Single file export when possible has been selected).
Creating Output¶
Figure_composer_30 shows the print composer with an example print layoutincluding each type of map element described in the sections above.
Figure Composer 30:
Print Composer with map view, legend, image, scalebar, coordinates , text and HTML frame added
The print composer allows you to create several output formats and it is possibleto define the resolution (print quality) and paper size:
- The Print icon allows to print the layout to aconnected printer or a Postscript file depending on installed printer drivers.
- The Export as image icon exports the composercanvas in several image formats such as PNG, BPM, TIF, JPG,...
- The Export as PDF saves the defined print composercanvas directly as a PDF.
- The Export as SVG icon saves the print composer canvasas a SVG (Scalable Vector Graphic).
Note
Currently the SVG output is very basic. This is not a QGIS problem, but aproblem of the underlaying Qt library. This will hopefully be sorted out infuture versions.Export big raster can sometimes fail, even if there seems to be enough memory.This is also a problem of the underlaying Qt management of raster.
Manage the Composer¶
With the Save as template and Load from template icons you can save the current state of a print composersession as a .qpt template and load the template again in another session.
The Composer Manager button in the QGIS toolbarand in Composer ‣ Composer Manager allows to add a new composertemplate, create a new composition based on a previously saved template or to managealready existing templates.
Figure Composer 31:
By default, the composer manager searches for user templates in ~/.qgis2/composer_template.
The New Composer and Duplicate Composerbuttons in the QGIS toolbar and in Composer ‣ New Composer andComposer ‣ Duplicate Composer allow to open a new composer dialog, or toduplicate an existing composition from a previously created one.
Finally you can save your print composition with the Save Project button.This is the same feature as in the QGIS main window. All changes will be saved in a QGIS projectfile.