--- title: "Polygon layer style controls" description: "Look up every control on a polygon layer's Style tab, with its choices, defaults, and ranges: fill colour, fill pattern, opacity, and outline." sidebar: label: "Polygon style controls" --- The `Style` tab for a polygon layer has a `Fill polygons by` dropdown (`Uniform colour` plus any field), fill colour and fill pattern controls, and stroke controls. This page lists every visible control with its defaults and value ranges. For the conceptual overview, see [How layer styling works in MangoMap](/docs/styling-layers/concepts-layer-styling). ## Fill polygons 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 polygon 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 Style section of a polygon layer with Fill polygons by set to Uniform colour, the fill colour swatch, the brush icon and the fill pattern dropdown set to Solid, Stroke set to Solid with the stroke colour swatch and the stroke width slider, and the Save button ### Fill colour Default: `#2196F3` (blue) with 50% alpha. Supports alpha — Uniform mode has no separate opacity slider; the colour picker's transparency channel is how you set fill transparency. ### Fill pattern | | | | --- | --- | | Default | `Solid` | | Choices | `Solid`, `Vertical Line`, `Horizontal Line`, `Slash`, `Back Slash`, `Grid`, `Diagonal Grid`, `Dots`, `Filled Arrow`, `Open Arrow`, `None` | | Where | Next to the fill colour, after a brush icon with the tooltip `Fill pattern style` | The pattern draws in the fill colour, at a fixed size on the screen. `None` draws no fill, so only the outline shows. With `None` and no stroke, the polygons don't show. In the legend and the printed legend, a `None` swatch has no fill. Fill pattern dropdown open on the Countries — Fill Patterns layer, listing Solid, Vertical Line, Horizontal Line, Slash, Back Slash, Grid, Diagonal Grid, Dots, Filled Arrow, Open Arrow, and None, each with a small preview (None is an empty dashed box with a diagonal line), with the map behind showing a different pattern on each continent ### Stroke Stroke (outline) controls: - `Stroke` — the stroke-style dropdown. Options: `None`, `Solid`, `Dashed`, `Dotted`. Default: `None` (no outline drawn). - `Stroke colour` — shown when stroke style is not `None`. Default: `#1976D2` (darker blue). - `Stroke width` — shown when stroke style is not `None`. Slider in pixels: range 0.5–10, step 0.5, default 1. Picking `None` from the `Stroke` dropdown hides the outline entirely. ## 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 selector applied across unique values, in list order. The picker lists qualitative palettes suited to categories. Colours repeat when there are more categories than palette colours. ### Fill pattern | | | | --- | --- | | Default | `Solid` | | Choices | `Solid`, `Vertical Line`, `Horizontal Line`, `Slash`, `Back Slash`, `Grid`, `Diagonal Grid`, `Dots`, `Filled Arrow`, `Open Arrow`, `None` | | Where | Below the colour scheme controls | The fill texture rendered in the fill colour. Changing it sets every category to the new pattern, including categories with their own pattern. ### Fill opacity Slider, 0–100%. ### Stroke style + colour + width Same as Uniform mode — apply globally to every polygon. ### Customise categories Per-category fill colour, label, visibility, drag-to-reorder, and fill-pattern override. ### Category list | | | | --- | --- | | 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 mode | See [Classification methods for by-quantity styling](/docs/styling-layers/classification-methods-reference). ### Colour scheme + Reverse colour ramp Palette selector with a reverse-ramp icon button. The picker lists sequential and diverging palettes suited to numeric values. ### Fill pattern, Fill opacity, Stroke Same controls as category style. ### Customise Class Breaks Per-break colour, range, label, visibility, and fill-pattern override. ## 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](/docs/styling-layers/troubleshoot-style-not-applying). ## Related - [How to set a uniform style on a polygon layer](/docs/styling-layers/set-a-uniform-polygon-style) - [How to style features by category](/docs/styling-layers/style-by-category) - [How to style features by quantity](/docs/styling-layers/style-by-quantity) - [How to style polygon outlines](/docs/styling-layers/style-polygon-outlines) - [How to style polygon fill patterns](/docs/styling-layers/style-polygon-fill-patterns) - [Category and class break symbology reference](/docs/styling-layers/category-and-class-break-symbology-reference) - [Classification methods for by-quantity styling](/docs/styling-layers/classification-methods-reference) - [How layer styling works in MangoMap](/docs/styling-layers/concepts-layer-styling)