심볼 라이브러리¶

Groups and smart groups¶

You can organize symbols into different categories. These categories, listed in the panel at the left, can be static (called Group) or dynamic (named Smart Group). A group is smart when its symbols are dynamically fetched according to conditions set. See figure_smart_group:

To create a group, right click on an existing group or on the main Groups directory in the left of the dialog. You can also select a group and click the ^{Add Group} button. The new group will be a sub-group of the selected one.

Create Smart Group is similar to creating group, but instead select Smart Groups. The dialog box allows user to choose the expression to select symbols in order to appear in the smart group (contains some tags, member of a group, have a string in its name, etc.). Any symbol that satisfies the entered condition(s) is automatically added to the smart group.

스마트 그룹 생성하기

To remove a group or a smart group, right click on the group and select Remove Group or select it and push ^{Remove Group} button.

Unlike the smart groups that automatically fetch their belonged symbols, simple groups are filled by the user. To add a symbol into a group, you can either right click on a symbol, choose Apply Group and then the group name. There is a second way to add several symbols into a group: just select the group, click and choose Group Symbols. All symbols display a checkbox that allows you to add the symbol into the selected groups. When selection is finished, you can click the same button, and choose Finish Grouping.

All the symbols that are not placed under a custom group belong to a default group named Ungrouped.

Add, Edit, Remove Symbol¶

Selecting a group returns in the right panel, if applicable, the list of symbols of the group (including its subgroups). These symbols are organized in four different tabs:

• Marker for point symbols
• Line for linear symbols
• Fill for surface symbols
• and 색상표.

To delete a symbol you no longer need, just select it and click ^{Remove item} (also available through right-click). The symbol will be deleted from the local symbols database.

The symbol list can be modified by adding new symbols with ^{Add item} button or modifying existing ones with ^{Edit item}. See 심볼 선택기 for further information.

Share symbols¶

The ^{Share item} tool, at the right bottom of the Style Library dialog, offers options to easily share symbols with others: users can indeed export their symbols and import symbols to their library.

Exporting symbols

You can export the selected symbols to PNG, SVG or XML file formats. Exporting to PNG or SVG (both not available for color ramp symbols) creates a file for each selected symbol, and the SVG folder can be added to SVG Paths in Settings ‣ Options to e.g. share these symbols on a network. The XML format generates a single file containing all the selected symbols. This file can then be imported in another user’s style library.

Importing symbols

You can extend your symbols library by importing new symbols. Just select Import from the drop-down list at the right bottom of the dialog. In the new dialog, you’ll need to :

• indicate the source of the symbols (it can be a .xml file on the disk or an url),
• give the name of the group under which the symbols will be put
• select the symbols you want to add to your library
• and press Import.

Note that import and export options are also available through right-click.

Importing symbols

색상표¶

The Color ramp tab in the Style Manager presents different types of color ramps you can use to style layers.

사용자 지정 색상표를 생성하려면, Color ramp 탭으로 가서 ^{Add item} 버튼을 클릭한 다음 드롭다운 목록에서 다음 색상표 유형 가운데 하나를 선택하십시오:

• Gradient: 시작 및 끝 색상을 설정해서 연속적(continuous) 일수도 있고 비연속적(discrete) 일 수도 있는 색상표를 생성합니다. 색상표 미리보기를 더블 클릭하면 중간 색상 지점(intermediate color stop)을 사용자가 원하는 만큼 추가할 수 있습니다.

• Random: creates a random set of colors based on range of values for hue, saturation, value and opacity and a number of colors (classes)
• ColorBrewer: a set of predefined discrete color gradients you can custom the number of colors in the ramp
• or cpt-city: an access to a whole catalog of color gradients to locally save as gradient color.

You can use the Invert option while classifying the data with a color ramp. See figure_color_custom_ramp for an example of a custom color ramp and figure_color_cpt_city for the cpt-city Colors dialog.

복수의 색상을 지정한 사용자 지정 그레이디언트 색상표의 예시

The cpt-city option opens a new dialog with hundreds of themes included ‘out of the box’.

색상표 수백 개를 보유한 cpt-city 대화창

심볼 레이어 트리¶

심볼은 여러 Symbol layers 로 이루어질 수 있습니다. 심볼 트리는 이후에 결합해 새 전체 수준 심볼을 형성하는 이 심볼 레이어들의 적층(overlay)을 표시합니다. 게다가, 심볼 속성을 변경하자마자 동적인 심볼 표현이 업데이트됩니다.

심볼 트리 항목을 관리할 수 있는 도구 집합이 있는데, 선택한 수준에 따라 대화창 하단에 활성화되는 서로 다른 도구들을 통해 다음 작업을 할 수 있습니다:

• ^{Add new symbol layer}: 원하는 만큼 심볼들을 겹칠 수 있습니다.

• ^{Remove the selected symbol layer}

• ^{Lock colors of symbol layer}: 잠긴 색상은 사용자가 전체 (또는 그 이상) 심볼 수준에서 색상을 변경하더라도 영향을 받지 않습니다.

• ^{Duplicate a (group of) symbol layer(s)}

• : 심볼 레이어를 위 또는 아래로 이동합니다.

심볼 환경 설정¶

QGIS는 심볼, 그 다음 심볼 레이어라는 두 단계를 거쳐 심볼 환경을 설정합니다.

-- render the centroid of a feature
centroid( $geometry )

-- visually overlap features within a 100 map units distance from a point
-- feature, i.e generate a 100m buffer around the point
buffer( $geometry, 100 )

-- Given polygon layer1( id1, layer2_id, ...) and layer2( id2, fieldn...)
-- render layer1 with a line joining centroids of both where layer2_id = id2
make_line( centroid( $geometry ),
           centroid( geometry( get_feature( 'layer2', 'id2', attribute(
               $currentfeature, 'layer2_id') ) )
         )