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< h1 id = "new-axes" > New Axes< / h1 >
< p > Axes in Chart.js can be individually extended. Axes should always derive from Chart.Scale but this is not a mandatory requirement.< / p >
< pre > < code class = "lang-javascript" > < span class = "hljs-keyword" > let< / span > MyScale = Chart.Scale.extend({
< span class = "hljs-comment" > /* extensions ... */< / span >
});
< span class = "hljs-comment" > // MyScale is now derived from Chart.Scale< / span >
< / code > < / pre >
< p > Once you have created your scale class, you need to register it with the global chart object so that it can be used. A default config for the scale may be provided when registering the constructor. The first parameter to the register function is a string key that is used later to identify which scale type to use for a chart.< / p >
< pre > < code class = "lang-javascript" > Chart.scaleService.registerScaleType(< span class = "hljs-string" > ' myScale' < / span > , MyScale, defaultConfigObject);
< / code > < / pre >
< p > To use the new scale, simply pass in the string key to the config when creating a chart.< / p >
< pre > < code class = "lang-javascript" > < span class = "hljs-keyword" > var< / span > lineChart = < span class = "hljs-keyword" > new< / span > Chart(ctx, {
data: data,
type: < span class = "hljs-string" > ' line' < / span > ,
options: {
scales: {
yAxes: [{
type: < span class = "hljs-string" > ' myScale' < / span > < span class = "hljs-comment" > // this is the same key that was passed to the registerScaleType function< / span >
}]
}
}
})
< / code > < / pre >
< h2 id = "scale-properties" > Scale Properties< / h2 >
< p > Scale instances are given the following properties during the fitting process.< / p >
< pre > < code class = "lang-javascript" > {
left: < span class = "hljs-built_in" > Number< / span > , < span class = "hljs-comment" > // left edge of the scale bounding box< / span >
right: < span class = "hljs-built_in" > Number< / span > , < span class = "hljs-comment" > // right edge of the bounding box' < / span >
top: < span class = "hljs-built_in" > Number< / span > ,
bottom: < span class = "hljs-built_in" > Number< / span > ,
width: < span class = "hljs-built_in" > Number< / span > , < span class = "hljs-comment" > // the same as right - left< / span >
height: < span class = "hljs-built_in" > Number< / span > , < span class = "hljs-comment" > // the same as bottom - top< / span >
< span class = "hljs-comment" > // Margin on each side. Like css, this is outside the bounding box.< / span >
margins: {
left: < span class = "hljs-built_in" > Number< / span > ,
right: < span class = "hljs-built_in" > Number< / span > ,
top: < span class = "hljs-built_in" > Number< / span > ,
bottom: < span class = "hljs-built_in" > Number< / span > ,
},
< span class = "hljs-comment" > // Amount of padding on the inside of the bounding box (like CSS)< / span >
paddingLeft: < span class = "hljs-built_in" > Number< / span > ,
paddingRight: < span class = "hljs-built_in" > Number< / span > ,
paddingTop: < span class = "hljs-built_in" > Number< / span > ,
paddingBottom: < span class = "hljs-built_in" > Number< / span > ,
}
< / code > < / pre >
< h2 id = "scale-interface" > Scale Interface< / h2 >
< p > To work with Chart.js, custom scale types must implement the following interface.< / p >
< pre > < code class = "lang-javascript" > {
< span class = "hljs-comment" > // Determines the data limits. Should set this.min and this.max to be the data max/min< / span >
determineDataLimits: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > < / span > ) < / span > {},
< span class = "hljs-comment" > // Generate tick marks. this.chart is the chart instance. The data object can be accessed as this.chart.data< / span >
< span class = "hljs-comment" > // buildTicks() should create a ticks array on the axis instance, if you intend to use any of the implementations from the base class< / span >
buildTicks: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > < / span > ) < / span > {},
< span class = "hljs-comment" > // Get the value to show for the data at the given index of the the given dataset, ie this.chart.data.datasets[datasetIndex].data[index]< / span >
getLabelForIndex: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > index, datasetIndex< / span > ) < / span > {},
< span class = "hljs-comment" > // Get the pixel (x coordinate for horizontal axis, y coordinate for vertical axis) for a given value< / span >
< span class = "hljs-comment" > // @param index: index into the ticks array< / span >
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< span class = "hljs-comment" > // @param includeOffset: if true, get the pixel halfway between the given tick and the next< / span >
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getPixelForTick: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > index, includeOffset< / span > ) < / span > {},
< span class = "hljs-comment" > // Get the pixel (x coordinate for horizontal axis, y coordinate for vertical axis) for a given value< / span >
< span class = "hljs-comment" > // @param value : the value to get the pixel for< / span >
< span class = "hljs-comment" > // @param index : index into the data array of the value< / span >
< span class = "hljs-comment" > // @param datasetIndex : index of the dataset the value comes from< / span >
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< span class = "hljs-comment" > // @param includeOffset : if true, get the pixel halfway between the given tick and the next< / span >
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getPixelForValue: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > value, index, datasetIndex, includeOffset< / span > ) < / span > {}
< span class = "hljs-comment" > // Get the value for a given pixel (x coordinate for horizontal axis, y coordinate for vertical axis)< / span >
< span class = "hljs-comment" > // @param pixel : pixel value< / span >
getValueForPixel: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > pixel< / span > ) < / span > {}
}
< / code > < / pre >
< p > Optionally, the following methods may also be overwritten, but an implementation is already provided by the < code > Chart.Scale< / code > base class.< / p >
< pre > < code class = "lang-javascript" > < span class = "hljs-comment" > // Transform the ticks array of the scale instance into strings. The default implementation simply calls this.options.ticks.callback(numericalTick, index, ticks);< / span >
convertTicksToLabels: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > < / span > ) < / span > {},
< span class = "hljs-comment" > // Determine how much the labels will rotate by. The default implementation will only rotate labels if the scale is horizontal.< / span >
calculateTickRotation: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > < / span > ) < / span > {},
< span class = "hljs-comment" > // Fits the scale into the canvas.< / span >
< span class = "hljs-comment" > // this.maxWidth and this.maxHeight will tell you the maximum dimensions the scale instance can be. Scales should endeavour to be as efficient as possible with canvas space.< / span >
< span class = "hljs-comment" > // this.margins is the amount of space you have on either side of your scale that you may expand in to. This is used already for calculating the best label rotation< / span >
< span class = "hljs-comment" > // You must set this.minSize to be the size of your scale. It must be an object containing 2 properties: width and height.< / span >
< span class = "hljs-comment" > // You must set this.width to be the width and this.height to be the height of the scale< / span >
fit: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > < / span > ) < / span > {},
< span class = "hljs-comment" > // Draws the scale onto the canvas. this.(left|right|top|bottom) will have been populated to tell you the area on the canvas to draw in< / span >
< span class = "hljs-comment" > // @param chartArea : an object containing four properties: left, right, top, bottom. This is the rectangle that lines, bars, etc will be drawn in. It may be used, for example, to draw grid lines.< / span >
draw: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > chartArea< / span > ) < / span > {},
< / code > < / pre >
< p > The Core.Scale base class also has some utility functions that you may find useful.< / p >
< pre > < code class = "lang-javascript" > {
< span class = "hljs-comment" > // Returns true if the scale instance is horizontal< / span >
isHorizontal: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > < / span > ) < / span > {},
< span class = "hljs-comment" > // Get the correct value from the value from this.chart.data.datasets[x].data[]< / span >
< span class = "hljs-comment" > // If dataValue is an object, returns .x or .y depending on the return of isHorizontal()< / span >
< span class = "hljs-comment" > // If the value is undefined, returns NaN< / span >
< span class = "hljs-comment" > // Otherwise returns the value.< / span >
< span class = "hljs-comment" > // Note that in all cases, the returned value is not guaranteed to be a Number< / span >
getRightValue: < span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > (< span class = "hljs-params" > dataValue< / span > ) < / span > {},
}
< / code > < / pre >
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