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通常,当使用缩放矩形进行缩小时,闪电图表JS将使视图适合当前数据。在您的情况下,您希望返回到原始轴间隔。您可以将侦听器附加到“规模转换”事件。在此侦听器中,您可以检查新的音阶范围是否大于原始范围。如果是,请将轴间隔设置回原始范围。
series.axisX
.onScaleChange((start, end) => {
if (end - start > intervalSize) {
series.axisX.setInterval(end - intervalSize, end)
}
})
“缩小矩形”在闪电图JS中称为“拟合矩形”。您可以使用图表XY.set适合矩形填充样式和图表XY.set调整矩形矩形笔触样式来更改它的视觉样式
chart.setFittingRectangleFillStyle(new SolidFill({color: ColorRGBA(255,0,0,125)}))
// Extract required parts from LightningChartJS.
const {
lightningChart,
DataPatterns,
AxisScrollStrategies,
SolidFill,
ColorRGBA
} = lcjs
const {
createProgressiveTraceGenerator
} = xydata
// Create a XY Chart.
const chart = lightningChart().ChartXY()
// Create progressive line series.
const series = chart.addLineSeries({
dataPattern: DataPatterns.horizontalProgressive
})
// configure axis
const intervalSize = 100
series.axisX
.setScrollStrategy(AxisScrollStrategies.progressive)
.setInterval(0, intervalSize)
// limit the axis interval to the original interval size
series.axisX
.onScaleChange((start, end) => {
if (end - start > intervalSize) {
series.axisX.setInterval(end - intervalSize, end)
}
})
// "Zoom out rectangle"
chart.setFittingRectangleFillStyle(new SolidFill({color: ColorRGBA(255,0,0,125)}))
// Generate traced points stream using 'xydata'-library.
createProgressiveTraceGenerator()
.setNumberOfPoints(1000)
.generate()
.setStreamRepeat(true)
.toStream()
.forEach(data => {
series.add(data)
})
<script src="https://unpkg.com/@arction/xydata@1.2.1/dist/xydata.iife.js"></script>
<script src="https://unpkg.com/@arction/lcjs@1.3.1/dist/lcjs.iife.js"></script>
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