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Added section on using patterns to fill datasets chartjs/Chart.js#1323

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Tom Loudon 2016-08-08 17:39:36 +01:00
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24
docs/01-Chart-Configuration.md
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@ -405,7 +405,9 @@ When supplying colors to Chart options, you can use a number of formats. You can
You can also pass a [CanvasGradient](https://developer.mozilla.org/en-US/docs/Web/API/CanvasGradient) object. You will need to create this before passing to the chart, but using it you can achieve some interesting effects.
The final option is to pass a [CanvasPattern](https://developer.mozilla.org/en-US/docs/Web/API/CanvasPattern) object. For example, if you wanted to fill a dataset with a pattern from an image you could do the following.
### Patterns
An alternative option is to pass a [CanvasPattern](https://developer.mozilla.org/en-US/docs/Web/API/CanvasPattern) object. For example, if you wanted to fill a dataset with a pattern from an image you could do the following.
```javascript
var img = new Image();
@ -424,5 +426,23 @@ img.onload = function() {
}
})
}
```
Using pattern fills for data graphics can help viewers with vision deficiencies (e.g. color-blindness or partial sight) to [more easily understand your data](http://betweentwobrackets.com/data-graphics-and-colour-vision/).
Using the [Patternomaly](https://github.com/ashiguruma/patternomaly) library you can generate patterns to fill datasets.
```javascript
var chartData = {
datasets: [{
data: [45, 25, 20, 10],
backgroundColor: [
pattern.draw('square', '#ff6384'),
pattern.draw('circle', '#36a2eb'),
pattern.draw('diamond', '#cc65fe'),
pattern.draw('triangle', '#ffce56'),
]
}],
labels: ['Red', 'Blue', 'Purple', 'Yellow']
};
```