17.2.5. 凡例アイテム

The Legend item is a box or a table that explains the meanings of the symbols used on the map. A legend is then bound to a map item. You can add a legend item with the Add Legend tool following items creation instructions and manipulate it the same way as exposed in Interacting with layout items.

By default, the legend item displays all available layers and can be refined using its Item Properties panel. Other than the items common properties, this feature has the following functionalities (see figure_layout_legend):

図 17.24 凡例アイテムプロパティパネル

17.2.5.1. メインプロパティ

The Main properties group of the legend Item Properties panel provides the following functionalities (see figure_layout_legend_ppt):

図 17.25 Legend Main properties group

メインプロパティでは:

• Change the Title of the legend. It can be made dynamic using the data-defined override setting, useful for example when generating an atlas;

• Choose which Map item the current legend will refer to. By default, the map over which the legend item is drawn is picked. If none, then it falls back to the reference map.

  注釈

  Variables of the linked map item (@map_id, @map_scale, @map_extent...) are also accessible from data-defined properties of the legend.

• Wrap the text of the legend on a given character: each time the character appears, it's replaced with a line break;

• Set the symbols and text placement in the legend: the Arrangement can be Symbols on left or Symbols on right. The default value depends on the locale in use (right-to-left based or not).

• Use Resize to fit contents to control whether or not a legend should be automatically resized to fit its contents. If unchecked, then the legend will never resize and instead just stick to whatever size the user has set. Any content which doesn't fit the size is cropped out.

17.2.5.2. 凡例アイテム

The Legend items group of the legend Item Properties panel provides the following functionalities (see figure_layout_legend_items):

図 17.26 Legend Items group

• The legend will be updated automatically if Auto-update is checked. When Auto-update is unchecked this will give you more control over the legend items. All the icons below the legend items list will be activated.

• 凡例アイテムウィンドウにはすべての凡例アイテムが表示され, アイテムの順序変更, レイヤのグループ化, 一覧へのアイテムの削除, 復活, レイヤ名の変更, フィルタの追加が可能です.

  • アイテムの順序は と ボタンを使用するか, 'ドラッグ・ドロップ' により変更できます。 WMS凡例グラフィックでは順序は変更できません。

  • ボタンを使用して凡例のグループを追加します。

  • ボタンを使用してレイヤーを追加し、 ボタンを使用してグループ、レイヤーまたはシンボルクラスを削除します。

  • ボタンはレイヤー、グループ名やタイトルを編集するために使用されます。まず、凡例アイテムを選択する必要があります。ダブルクリックするアイテムには、その名前を変更するには、テキストボックスを開きます。

  • allows you to add expressions to each symbol label of a given layer. New variables (@symbol_label, @symbol_id and @symbol_count) help you interact with the legend entry.

    For example, given a categorized layer, you can append to each class in the legend their number of features, ie class (number):

    1. Select the layer entry in the legend tree

    2. Press the button, opening the Expression String Builder dialog

    3. Enter the following expression:

       concat( @symbol_label, ' (', @symbol_count, ')' )
       

    4. Press OK

  • ボタンは、ベクターレイヤーの各クラスの地物の数を足し算します。

  • The ^{Filter legend by expression} helps you filter which of the legend items of a layer will be displayed, i.e. using a layer that has different legend items (e.g., from a rule-based or categorized symbology), you can specify a boolean expression to remove from the legend tree, styles that have no feature satisfying a condition. Note that the features are nevertheless kept and shown in the layout map item.

  While the default behavior of the legend item is to mimic the Layers panel tree, displaying the same groups, layers and classes of symbology, right-click any item offers you options to hide layer's name or raise it as a group or subgroup. In case you have made some changes to a layer, you can revert them by choosing Reset to defaults from the contextual menu of the legend entry.

  After changing the symbology in the QGIS main window, you can click on Update All to adapt the changes in the legend element of the print layout.

• With the Only show items inside linked map, only the legend items visible in the linked map will be listed in the legend. This tool remains available when Auto-update is active

• ポリゴン地物を使用して地図帳を作成する際に、現在の地図帳地物の外にある凡例アイテムを除外できます。これを行うには、 現在のアトラス機能の中にのみアイテムを表示する オプションをチェックしてください。

17.2.5.3. Fonts

The Fonts group of the legend Item Properties panel provides the following functionalities:

図 17.27 Legend Fonts properties

• You can change the font of the legend title, group, subgroup and item (feature) in the legend item using the font selector widget

• For each of these levels you can set the text Alignment: it can be Left (default for left-to-right based locales), Center or Right (default for right-to-left based locales).

• You set the Color of the labels using the color selector widget. The selected color will apply to all the font items in the legend.

17.2.5.4. Columns

Under the Columns group of the legend Item Properties panel, legend items can be arranged over several columns:

• Set the number of columns in the Count field. This value can be made dynamic e.g., following atlas features, legend contents, the frame size...

• 列を等幅で作成 をチェックすると凡例の列幅が調整されます.

• レイヤーの分割 オプションでは、列の間で分けて凡例を分類することができます。

図 17.28 Legend Columns settings

17.2.5.5. Symbol

The Symbol group of the legend Item Properties panel configures the size of symbols displayed next to the legend labels. You can:

• Set the Symbol width and Symbol height

• Draw stroke for raster symbols: this adds an outline to the symbol representing the band color of the raster layer; you can set both the Stroke color and Tickness.

図 17.29 Legend Symbol configuration

17.2.5.6. WMS凡例グラフィックと間隔

The WMS LegendGraphic and Spacing groups of the legend Item Properties panel provide the following functionalities (see figure_layout_legend_wms):

図 17.30 WMS LegendGraphic and Spacing groups

When you have added a WMS layer and you insert a legend item, a request will be sent to the WMS server to provide a WMS legend. This Legend will only be shown if the WMS server provides the GetLegendGraphic capability. The WMS legend content will be provided as a raster image.

WMS凡例グラフィック は, WMS凡例ラスタイメージの 凡例幅 と 凡例高さ で調整することができます.

Spacing around title, groups, subgroups, symbols, labels, boxes, columns and lines can be customized through this dialog.