优化波形

src/utils/chartAxisHelper.ts

@@ -0,0 +1,59 @@
+const AXIS_DECIMALS = 2
+
+export function roundAxisValue(val: number, decimals = AXIS_DECIMALS): number {
+    if (!Number.isFinite(val)) return 0
+    const factor = 10 ** decimals
+    return Math.round(val * factor) / factor
+}
+
+/** Y 轴刻度：最多 2 位小数，末尾 0 去掉（如 1.00 → 1，0.10 → 0.1） */
+export function formatAxisLabel(value: number): string {
+    if (!Number.isFinite(value)) return '0'
+    return String(Number(roundAxisValue(value).toFixed(AXIS_DECIMALS)))
+}
+
+/** 瞬间波形 Y 轴范围 */
+export function calcShuYAxisRange(dataMin: number, dataMax: number): { min: number; max: number } {
+    const min = Number(dataMin)
+    const max = Number(dataMax)
+    if (!Number.isFinite(min) || !Number.isFinite(max)) {
+        return { min: 0, max: 1 }
+    }
+
+    let axisMax = max * 1.1
+    let axisMin = min > 0 ? min - min * 0.1 : min * 1.1
+
+    if (axisMax <= axisMin) {
+        const pad = Math.abs(max) * 0.1 || 0.01
+        axisMax = max + pad
+        axisMin = min - pad
+    }
+
+    return {
+        min: roundAxisValue(axisMin),
+        max: roundAxisValue(axisMax)
+    }
+}
+
+/** RMS 波形 Y 轴范围 */
+export function calcRmsYAxisRange(dataMin: number, dataMax: number): { min: number; max: number } {
+    const min = Number(dataMin)
+    const max = Number(dataMax)
+    if (!Number.isFinite(min) || !Number.isFinite(max)) {
+        return { min: 0, max: 1 }
+    }
+
+    let axisMax = max * 1.06 * 1.1
+    let axisMin = min - min * 0.2
+
+    if (axisMax <= axisMin) {
+        const pad = Math.abs(max - min) * 0.1 || Math.abs(max) * 0.1 || 0.01
+        axisMax = max + pad
+        axisMin = min - pad
+    }
+
+    return {
+        min: roundAxisValue(axisMin),
+        max: roundAxisValue(axisMax)
+    }
+}