Line layer style controls

Every control on a line layer's Style tab, with defaults and value ranges: colour, width, pattern, cap, join, and casing.

The Style tab for a line layer has a Colour lines by dropdown (Uniform colour plus any field), a line-width slider, and a collapsible More line settings section with pattern, cap, join, and casing controls. This page lists every visible control with its defaults and value ranges.

For the conceptual overview, see How layer styling works in MangoMap.

Colour lines by

Default	`Uniform colour`
Choices	`Uniform colour`, plus any text or numeric field on the dataset
Where	First control in the `Style` tab

Uniform colour paints every line the same. A text field gives one colour per category. A numeric field gives classes or a gradient; its Style as dropdown can switch it to one colour per value.

Controls when colour driver = Uniform colour

Line colour

Default: #2196F3 (blue). Supports alpha — Uniform mode has no separate opacity slider; the colour picker’s transparency channel is how you set line transparency.

Line width

Default	`2 px`
Range	`0.5–20`, step 0.5
Unit	Pixels

Line width is one value for the whole layer. It can’t come from a field.

Controls when colour driver = a field styled as categories

A text field always uses these controls. A numeric field uses them when Style as is Categories.

Style as

Numeric fields only. Shown at the top of the category controls, set to Categories. Pick another choice to go back to classes or Continuous; the choices are listed in the numeric-field section below.

Colour scheme

Palette assigned across unique values, in list order. The picker lists palettes made for categories. Colours repeat when there are more categories than palette colours.

Opacity

Slider, 0–100%.

Customise categories

Per-category colour, label, visibility, drag-to-reorder, and line-pattern overrides. See Category and class break symbology reference.

Values	One category per distinct value. Numbers are not rounded or grouped.
Order	Numbers from lowest to highest; text from A to Z
Limit	50 values. Values past the first 50 draw as one `Other` category.
Empty values	Features with no value draw as one `Null` category
Add or remove	Not available. Hide a category instead.

Controls when colour driver = a numeric field styled as classes or Continuous

Style as

Default	`5 classes`
Choices	`Continuous`, `Categories`, `3 classes`, `4 classes`, `5 classes`, `6 classes`, `7 classes`, `8 classes`, `9 classes`
Where	Numeric fields only. Beside the classification method dropdown (no label; tooltip “How to divide values into classes”) when a class count is picked.

Continuous draws a smooth gradient. A class count draws one colour per class. Categories switches to the category controls above. Switching between Categories and the other choices removes the customisations of the mode you leave.

Classification method

Choices	`Equal Interval`, `Quantile`, `Natural Breaks (Jenks)`, `Head/Tail Breaks`
Where	Shown only in discrete (not `Continuous`) mode

See Classification methods for by-quantity styling.

Colour scheme + Reverse colour ramp

Palette selector with a reverse-ramp icon button.

Opacity

Slider, 0–100%.

Customise Class Breaks

Per-break colour, range, label, visibility, and line-pattern overrides.

More line settings (collapsible)

Available regardless of colour driver. Pattern, cap, join, and casing apply globally to the layer.

Line pattern

Default	`Solid`
Choices	`Solid`, `Dashed`, `Dotted`

The dash pattern of the main line. Each choice shows a preview with the layer’s cap and casing. On a layer coloured by categories, picking a pattern here sets every category to it; a category can then get its own pattern in Customise categories.

The pattern grows with the line width.

Line cap

Default	`Round`
Choices	`Butt`, `Round`, `Square`

How line endpoints are drawn. On Dashed and Dotted lines, it also shapes each dash or dot: Round gives round dots, Butt gives square dots, and Square draws the same as Butt.

Line join

Default	`Round`
Choices	`Bevel`, `Round`, `Miter`

How line corners are drawn.

Casing

A coloured outline drawn behind the main line. The casing surface has two controls only:

Line casing — checkbox. Turns the casing on or off. Default: off.
Casing colour — picker, shown when casing is on. Default: #000000 (black).

The casing adds a fixed 2 px band on each side of the line at any Line width — it doesn’t scale with the line’s width. On Dashed and Dotted lines, the casing outlines each dash or dot and leaves the gaps open.

The legend swatch and the printed legend show the layer’s pattern, cap, and casing.

See How to style line patterns and casing.

Save button

Label	`Save`
Where	Bottom of the `Style` tab

The Style tab doesn’t auto-save. Your changes apply only when you click Save. Closing the panel or switching tabs discards every unsaved change. See Troubleshooting: my style change isn’t appearing on the map.