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# Understanding Layers

There are 3 types of Layer Definitions:

> - Vector Layer Definitions
> - Drawing Layer Definitions
> - Grid (Raster) Layer Definitions

Vector Layer Definitions describe style and presentation settings for vector data coming from a Feature Source. Structurally, a Vector Layer Definition has:

> - 1 or more Scale Ranges
> - Each Scale Range can have 1 or more point/area/line rules. Creating a theme will auto-generate a certain number of point/area/line rules based on the theming criteria.

Drawing Layer Definitions describe presentation settings for data coming from a Drawing Source. A Drawing Source layer simply specifies the DWF layers from the Drawing Source that will be displayed for this Layer Definition

Raster Layer Definitions describe style and presentation settings for raster data coming from a Feature Source. Structurally a Raster Layer Definition has a single scale range, with a specified color style and optional hillshade and elevation settings.

This section describes the Layer Definition editor and its various settings.

## Vector Layer Editor

### Resource Settings

The Resource Settings section of the Vector Layer editor specifies the core properties of this Vector Layer

Resource Settings section

The Feature Source field specifies the Feature Source this Layer Definition applies to. The Feature Class field and Geometry Property fields specifies the Geometry property that these style settings will be applied to.

All the fields under the Layer Settings group specify viewer interaction behaviors:

> - Filter specifies an FDO attribute filter that will be applied when querying data from the Feature Source for rendering
> - Hyperlink specifies an FDO expression that represents the URL that will be launched when the user CTRL+clicks on a feature in this layer
> - Tooltip specifics an FDO expression that represents the HTML content that is displayed in a tooltip when the user hovers over any feature on this layer with the mouse pointer.

### Layer Properties Visible in Viewer

The Layer Properties Visible in Viewer section of the editor specifies what properties of this layer are visible in the Properties Pane of the AJAX or Fusion viewer when a feature from this layer is selected.

Layer Properties Visible in Viewer

Simply tick the desired properties to make them visible. You can edit cells in the Display Name column to change the label for each property.

### Layer Styles

The Layer Styles section is the meat and potatoes of this editor.

Layer Styles

The above screenshot shows an editor for one particular scale range (0 to 10000). Clicking Add on the toolbar will add another control for a new scale range. Each scale range has:

> - 0 or more point styles. Un-ticking Display points will detach all currently specified point styles.
> - 0 or more line styles. Un-ticking Display lines will detach all currently specified line styles.
> - 0 or more area (polygon) styles. Un-ticking Display areas will detach all currently specified area styles.

Each point/line/area style is represented by a control like the one below

A style rule control

These controls will allow you to edit (from left to right):

> - The FDO filter that a feature must satisfy for this rule to be applied (default is empty = all features). Clicking the button will launch the FDO Expression Editor.
> - The legend label for this rule
> - The style preview for this rule. Clicking the button will launch the respective point/line/area style editor.
> - The feature label. Clicking the button will launch the FDO Expression Editor.

Rules can be added by clicking the add button on the top toolbar (indicated by a green plus icon).

A theme can be generated by clicking on the theme button on the top toolbar (indicated by 3 overlapping circles of different colors). See Theming Layers for more information.

Rules can be removed by clicking the remove button for the associated rule style control (indicated by a red minus icon)

### Theming Layers

Clicking the theme button will display the following dialog

The theme creator dialog

This dialog provides all the options for generating a theme, which can be based on:

> - All values of a specific property
> - All ranges/distributions of a specific property

Each generated rule wil use a color from a specified color ramp. The color ramp can be gradient-based or use ColorBrewer thematics.

Once you have specified the theme settings and clicked OK, the matching rules will be generated and will replace or be appended to your existing set of style rules for this scale range.

### Point Style Rules

Clicking the ... button beside the previewed point style on the rule editor control will display the Point Style Dialog

The Point Style dialog

There are many options here, but this guide will only cover the main ones.

Point features can be drawn as symbols or as text labels. The Display Points checkbox governs this behavior. Ticking it will cause these points to be drawn as symbols. Un-ticking it will cause these points to be drawn as text. The symbol size and rotation parameters can either be numbers or numerical FDO expressions.

For point symbology, you can choose a pre-defined list of symbols under the Symbol dropdown. The very last option in that dropdown (Symbol) allows you to pick a custom symbol from an existing Symbol Library resource.

Note that the generated preview at the bottom of the dialog is not perfect and does not exactly reflect the style settings you have defined. Use the Preview command in the main toolbar to view this Layer in your system default web browser. Here you can better verify your point style settings are correct.

### Line Style Rules

Clicking the ... button beside the previewed line style on the rule editor control will display the Line Style Dialog

The Line Style Dialog

Just like point rules, line rules need not actually display lines. Line rules can display text. If so, the text labels will be rendered along the line geometry of each matching feature, but the line itself will not be rendered. The Apply line style checkbox governs whether the lines will be rendered.

You can specify color, thickness and line pattern for the line style. Size context and units govern how the thickness parameter is to be interpreted when rendering.

Line styles can be single or composite. The Use composite lines checkbox determines whether the line style will be single or composite.

The Line Style Dialog with composite settings enabled

Composite line styles consists of multiple line patterns stacked on top of each other to form a composite line style. Line geometries of each matching feature will be rendered with this line style. To add or remove lines from the composite line style, use the Add and Remove buttons on the Composite Line toolbar.

### Area Style Rules

Clicking the ... button beside the previewed area style on the rule editor control will display the Area Style Dialog

The Area Style Dialog

This dialog allows you to control the two main aspects of an area style:

> - The fill display
> - The edge/border display

Once again, the preview at the bottom of the dialog reflects your current style settings.

### Label Settings

Clicking the ... button beside the label preview on the rule editor control will display the Label Settings Dialog

The Label Settings Dialog

This dialog allows you to control the labelling of line/area/point styles. Label text can be hard-coded strings or more commonly: derived from an FDO expression or a Feature Class Property.

## Drawing Layer Editor

Just like the Drawing Source editor, the Drawing Layer editor is pretty simple and straight forward.

The Drawing Layer Editor

All you need to specify are:

> - The Drawing Source this layer will read from.
> - The DWF sheet this layer will read from.
> - The DWF layers this layer will read from.
> - The min/max scale that this Drawing Layer will be visible at.

## Raster Layer Editor

### Raster Layer Settings

The Raster Layer editor defines style settings for raster data coming from a Feature Source.

Raster Layer Settings

Just like the Vector Layer editor, the Raster Layer editor requires a reference to a Feature Source and the Geometry Property (Raster Property) of a Feature Class so it knows where to source its raster data from.

### Raster Layer Visibility

The Raster Layer Visibility settings govern what scale this Raster Layer is visible at.

Raster Layer Visibility

You can also define bitonal image color settings and the zoom factor which the raster is rebuilt.

### Advanced Raster Settings

The Advanced Raster Settings allows you to enable settings for raster formats that support such settings.

Advanced Raster Layer Settings

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