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< h1 >
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< a href = "../.." > Linear< / a >
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< h1 id = "linear-cartesian-axis" > Linear Cartesian Axis< / h1 >
< p > The linear scale is use to chart numerical data. It can be placed on either the x or y axis. The scatter chart type automatically configures a line chart to use one of these scales for the x axis. As the name suggests, linear interpolation is used to determine where a value lies on the axis.< / p >
< h2 id = "tick-configuration-options" > Tick Configuration Options< / h2 >
< p > The following options are provided by the linear scale. They are all located in the < code > ticks< / code > sub options. These options extend the < a href = "./#tick-configuration" > common tick configuration< / a > .< / p >
< table >
< thead >
< tr >
< th > Name< / th >
< th > Type< / th >
< th > Default< / th >
< th > Description< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td > < code > beginAtZero< / code > < / td >
< td > < code > Boolean< / code > < / td >
< td > < / td >
< td > if true, scale will include 0 if it is not already included.< / td >
< / tr >
< tr >
< td > < code > min< / code > < / td >
< td > < code > Number< / code > < / td >
< td > < / td >
< td > User defined minimum number for the scale, overrides minimum value from data. < a href = "#axis-range-settings" > more...< / a > < / td >
< / tr >
< tr >
< td > < code > max< / code > < / td >
< td > < code > Number< / code > < / td >
< td > < / td >
< td > User defined maximum number for the scale, overrides maximum value from data. < a href = "#axis-range-settings" > more...< / a > < / td >
< / tr >
< tr >
< td > < code > maxTicksLimit< / code > < / td >
< td > < code > Number< / code > < / td >
< td > < code > 11< / code > < / td >
< td > Maximum number of ticks and gridlines to show.< / td >
< / tr >
< tr >
< td > < code > stepSize< / code > < / td >
< td > < code > Number< / code > < / td >
< td > < / td >
< td > User defined fixed step size for the scale. < a href = "#step-size" > more...< / a > < / td >
< / tr >
< tr >
< td > < code > suggestedMax< / code > < / td >
< td > < code > Number< / code > < / td >
< td > < / td >
< td > Adjustment used when calculating the maximum data value. < a href = "#axis-range-settings" > more...< / a > < / td >
< / tr >
< tr >
< td > < code > suggestedMin< / code > < / td >
< td > < code > Number< / code > < / td >
< td > < / td >
< td > Adjustment used when calculating the minimum data value. < a href = "#axis-range-settings" > more...< / a > < / td >
< / tr >
< / tbody >
< / table >
< h2 id = "axis-range-settings" > Axis Range Settings< / h2 >
< p > Given the number of axis range settings, it is important to understand how they all interact with each other.< / p >
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< p > The < code > suggestedMax< / code > and < code > suggestedMin< / code > settings only change the data values that are used to scale the axis. These are useful for extending the range of the axis while maintaining the auto fit behaviour.< / p >
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< pre > < code class = "lang-javascript" > < span class = "hljs-keyword" > let< / span > minDataValue = < span class = "hljs-built_in" > Math< / span > .min(mostNegativeValue, options.ticks.suggestedMin);
< span class = "hljs-keyword" > let< / span > maxDataValue = < span class = "hljs-built_in" > Math< / span > .max(mostPositiveValue, options.ticks.suggestedMax);
< / code > < / pre >
< p > In this example, the largest positive value is 50, but the data maximum is expanded out to 100. However, because the lowest data value is below the < code > suggestedMin< / code > setting, it is ignored.< / p >
< pre > < code class = "lang-javascript" > < span class = "hljs-keyword" > let< / span > chart = < span class = "hljs-keyword" > new< / span > Chart(ctx, {
type: < span class = "hljs-string" > ' line' < / span > ,
data: {
datasets: [{
label: < span class = "hljs-string" > ' First dataset' < / span > ,
data: [< span class = "hljs-number" > 0< / span > , < span class = "hljs-number" > 20< / span > , < span class = "hljs-number" > 40< / span > , < span class = "hljs-number" > 50< / span > ]
}],
labels: [< span class = "hljs-string" > ' January' < / span > , < span class = "hljs-string" > ' February' < / span > , < span class = "hljs-string" > ' March' < / span > , < span class = "hljs-string" > ' April' < / span > ]
},
options: {
scales: {
yAxes: [{
ticks: {
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suggestedMin: < span class = "hljs-number" > 50< / span > ,
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suggestedMax: < span class = "hljs-number" > 100< / span >
}
}]
}
}
});
< / code > < / pre >
< p > In contrast to the < code > suggested*< / code > settings, the < code > min< / code > and < code > max< / code > settings set explicit ends to the axes. When these are set, some data points may not be visible.< / p >
< h2 id = "step-size" > Step Size< / h2 >
< p > If set, the scale ticks will be enumerated by multiple of stepSize, having one tick per increment. If not set, the ticks are labeled automatically using the nice numbers algorithm.< / p >
< p > This example sets up a chart with a y axis that creates ticks at < code > 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5< / code > .< / p >
< pre > < code class = "lang-javascript" > < span class = "hljs-keyword" > let< / span > options = {
scales: {
yAxes: [{
ticks: {
max: < span class = "hljs-number" > 5< / span > ,
min: < span class = "hljs-number" > 0< / span > ,
stepSize: < span class = "hljs-number" > 0.5< / span >
}
}]
}
};
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