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738ee34d0b
* Remove extra font parsing in Scale.fit * Implement scriptable options for tick formatting
60 lines
4.6 KiB
Markdown
60 lines
4.6 KiB
Markdown
# Styling
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There are a number of options to allow styling an axis. There are settings to control [grid lines](#grid-line-configuration) and [ticks](#tick-configuration).
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## Grid Line Configuration
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The grid line configuration is nested under the scale configuration in the `gridLines` key. It defines options for the grid lines that run perpendicular to the axis.
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| Name | Type | Default | Description
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| ---- | ---- | ------- | -----------
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| `display` | `boolean` | `true` | If false, do not display grid lines for this axis.
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| `borderColor` | `Color` | | If set, used as the color of the border line. If unset, the first `color` option is resolved and used.
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| `borderWidth` | `number` | | If set, used as the width of the border line. If unset, the first `lineWidth` option is resolved and used.
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| `circular` | `boolean` | `false` | If true, gridlines are circular (on radar chart only).
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| `color` | <code>Color|Color[]|function</code> | `'rgba(0, 0, 0, 0.1)'` | The color of the grid lines. If specified as an array, the first color applies to the first grid line, the second to the second grid line and so on.
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| `borderDash` | `number[]` | `[]` | Length and spacing of dashes on grid lines. See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash).
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| `borderDashOffset` | <code>number|function</code> | `0.0` | Offset for line dashes. See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineDashOffset).
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| `lineWidth` | <code>number|number[]|function</code> | `1` | Stroke width of grid lines.
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| `drawBorder` | `boolean` | `true` | If true, draw border at the edge between the axis and the chart area.
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| `drawOnChartArea` | `boolean` | `true` | If true, draw lines on the chart area inside the axis lines. This is useful when there are multiple axes and you need to control which grid lines are drawn.
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| `drawTicks` | `boolean` | `true` | If true, draw lines beside the ticks in the axis area beside the chart.
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| `tickMarkLength` | `number` | `10` | Length in pixels that the grid lines will draw into the axis area.
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| `offsetGridLines` | `boolean` | `false` | If true, grid lines will be shifted to be between labels. This is set to `true` for a bar chart by default.
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| `z` | `number` | `0` | z-index of gridline layer. Values <= 0 are drawn under datasets, > 0 on top.
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For function arguments, the function is passed a context object that is of the form:
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```javscript
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{
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scale: // Scale object
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tick: // Tick object
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}
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```
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## Tick Configuration
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The tick configuration is nested under the scale configuration in the `ticks` key. It defines options for the tick marks that are generated by the axis.
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| Name | Type | [Scriptable](../general/options.md#scriptable-options) | Default | Description
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| ---- | ---- | ------- | -----------
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| `callback` | `function` | | | Returns the string representation of the tick value as it should be displayed on the chart. See [callback](../axes/labelling.md#creating-custom-tick-formats).
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| `display` | `boolean` | | `true` | If true, show tick labels.
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| `fontColor` | `Color` | Yes | `'#666'` | Font color for tick labels.
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| `fontFamily` | `string` | Yes | `"'Helvetica Neue', 'Helvetica', 'Arial', sans-serif"` | Font family for the tick labels, follows CSS font-family options.
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| `fontSize` | `number` | Yes | `12` | Font size for the tick labels.
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| `fontStyle` | `string` | Yes | `'normal'` | Font style for the tick labels, follows CSS font-style options (i.e. normal, italic, oblique, initial, inherit).
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| `lineHeight` | <code>number|string</code> | Yes | `1.2` | Height of an individual line of text (see [MDN](https://developer.mozilla.org/en-US/docs/Web/CSS/line-height)).
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| `lineWidth` | `number` | Yes | `0` | Stroke width around the text.
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| `major` | `object` | | `{}` | Major ticks configuration.
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| `padding` | `number` | | `0` | Sets the offset of the tick labels from the axis
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| `reverse` | `boolean` | | `false` | Reverses order of tick labels.
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| `strokeStyle` | `string` | Yes | `` | The color of the stroke around the text.
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| `z` | `number` | `0` | | z-index of tick layer. Useful when ticks are drawn on chart area. Values <= 0 are drawn under datasets, > 0 on top.
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## Major Tick Configuration
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The majorTick configuration is nested under the ticks configuration in the `major` key. It defines options for the major tick marks that are generated by the axis.
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| Name | Type | Default | Description
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| ---- | ---- | ------- | -----------
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| `enabled` | `boolean` | `false` | If true, major ticks are generated. A major tick will affect autoskipping and `major` will be defined on ticks in the scriptable options context.
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