Mountain (or Area) Series can be created using the FastMountainRenderableSeries type.
The JavaScript Mountain Chart Example can be found in the SciChart.Js Examples Suite on Github, or our live demo at demo.scichart.com
Above: The JavaScript Mountain Chart example from the SciChart.js Demo.
Create a Mountain Series
To create a Javascript Mountain Chart with SciChart.js, use the following code:
In the code above:
- A Mountain Series instance is created and added to the SciChartSurface.renderableSeries collection.
- We set the stroke, strokethickness and fill properties
- ZeroLineY defines where the zero crossing is. The default is 0.0
- We assign a DataSeries - which stores the Xy data to render.
This results in the following output:
<div id="scichart-root" ></div>
body { margin: 0; }
#scichart-root { width: 100%; height: 100vh; }
async function simpleMountainChart(divElementId) {
// #region ExampleA
// Demonstrates how to create a Mountain (Area) chart with SciChart.js
const {
SciChartSurface,
NumericAxis,
FastMountainRenderableSeries,
GradientParams,
XyDataSeries,
Point,
SciChartJsNavyTheme
} = SciChart;
// or, for npm, import { SciChartSurface, ... } from "scichart"
const { wasmContext, sciChartSurface } = await SciChartSurface.create(divElementId, {
theme: new SciChartJsNavyTheme()
});
sciChartSurface.xAxes.add(new NumericAxis(wasmContext));
sciChartSurface.yAxes.add(new NumericAxis(wasmContext));
// Create some data
let yLast = 100.0;
const xValues = [];
const yValues = [];
for (let i = 0; i <= 250; i++) {
const y = yLast + (Math.random() - 0.48);
yLast = y;
xValues.push(i);
yValues.push(y);
}
// Create a mountain series & add to the chart
const mountainSeries = new FastMountainRenderableSeries(wasmContext, {
dataSeries: new XyDataSeries(wasmContext, { xValues, yValues }),
stroke: "#4682b4",
strokeThickness: 3,
zeroLineY: 0.0,
// when a solid color is required, use fill
fill: "rgba(176, 196, 222, 0.7)",
// when a gradient is required, use fillLinearGradient
fillLinearGradient: new GradientParams(new Point(0, 0), new Point(0, 1), [
{ color: "rgba(70,130,180,0.77)", offset: 0 },
{ color: "rgba(70,130,180,0.0)", offset: 1 },
]),
});
sciChartSurface.renderableSeries.add(mountainSeries);
// #endregion
};
simpleMountainChart("scichart-root");
async function builderExample(divElementId) {
// #region ExampleB
// Demonstrates how to create a line chart with SciChart.js using the Builder API
const {
chartBuilder,
ESeriesType,
EThemeProviderType
} = SciChart;
// or, for npm, import { chartBuilder, ... } from "scichart"
// Create some data
let yLast = 100.0;
const xValues = [];
const yValues = [];
for (let i = 0; i <= 250; i++) {
const y = yLast + (Math.random() - 0.48);
yLast = y;
xValues.push(i);
yValues.push(y);
}
const { wasmContext, sciChartSurface } = await chartBuilder.build2DChart(divElementId, {
surface: { theme: { type: EThemeProviderType.Dark } },
series: [
{
type: ESeriesType.MountainSeries,
xyData: {
xValues,
yValues,
},
options: {
stroke: "#4682b4",
strokeThickness: 3,
zeroLineY: 0.0,
fill: "rgba(176, 196, 222, 0.7)", // when a solid color is required, use fill
fillLinearGradient: {
gradientStops: [{ color:"rgba(70,130,180,0.77)",offset:0.0 },{ color: "rgba(70,130,180,0.0)", offset:1 }],
startPoint: { x:0, y:0 },
endPoint: { x:0, y:1}
}
}
}
]
});
// #endregion
};
// Uncomment this to use the builder example
//builderExample("scichart-root");
Render a Gap in a Mountain Series
It is possible to have null points or gaps in a Mountain Series by passing a data point with a NaN value as the Y value. Please refer to the Common Series Features - Draw Gaps in Series article for more details.
Add Point Markers onto a Mountain Series
It is possible to put scatter point markers of varying type (Ellipse, Square, Triangle, Cross, Custom) onto a Mountain Series via the PointMarker API. To learn more, see the documentation page Drawing PointMarkers on Series.
To learn more about the types of Point Marker in SciChart.js, see the Point Markers API documentation.
There is also a dedicated Scatter Series type and a Bubble Series type with some more options.
Painting Mountain Segments with Different Colors
It is possible to define the colour of line segments as well as mountain fills individually using the PaletteProvider API.
For more info on how to do this, see the PaletteProvider - Per-point colouring of Mountain Charts documentation page.