feat(sampler): add min-max sampler function

apache · Nov 6, 2023 · a15892e · a15892e
1 parent fd9e62d
commit a15892e
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Showing 2 changed files with 21 additions and 5 deletions.
diff --git a/src/processor/dataSample.ts b/src/processor/dataSample.ts
@@ -17,10 +17,10 @@
 * under the License.
 */
 
-import { StageHandler, SeriesOption, SeriesSamplingOptionMixin } from '../util/types';
-import { Dictionary } from 'zrender/src/core/types';
+import {StageHandler, SeriesOption, SeriesSamplingOptionMixin} from '../util/types';
+import {Dictionary} from 'zrender/src/core/types';
 import SeriesModel from '../model/Series';
-import { isFunction, isString } from 'zrender/src/core/util';
+import {isFunction, isString} from 'zrender/src/core/util';
 
 
 type Sampler = (frame: ArrayLike<number>) => number;
@@ -61,6 +61,22 @@ const samplers: Dictionary<Sampler> = {
         // NaN will cause illegal axis extent.
         return isFinite(min) ? min : NaN;
     },
+    minmax: function (frame) {
+        let turningPointAbsoluteValue = -Infinity;
+        let turningPointOriginalValue = -Infinity;
+
+        for (let i = 0; i < frame.length; i++) {
+            const originalValue = frame[i];
+            const absoluteValue = Math.abs(originalValue);
+
+            if (absoluteValue > turningPointAbsoluteValue) {
+                turningPointAbsoluteValue = absoluteValue;
+                turningPointOriginalValue = originalValue;
+            }
+        }
+
+        return isFinite(turningPointOriginalValue) ? turningPointOriginalValue : NaN;
+    },
     // TODO
     // Median
     nearest: function (frame) {
@@ -116,4 +132,4 @@ export default function dataSample(seriesType: string): StageHandler {
             }
         }
     };
-}
+}
diff --git a/src/util/types.ts b/src/util/types.ts
@@ -1675,7 +1675,7 @@ export interface SeriesStackOptionMixin {
 type SamplingFunc = (frame: ArrayLike<number>) => number;
 
 export interface SeriesSamplingOptionMixin {
-    sampling?: 'none' | 'average' | 'min' | 'max' | 'sum' | 'lttb' | SamplingFunc
+    sampling?: 'none' | 'average' | 'min' | 'max' | 'minmax' | 'sum' | 'lttb' | SamplingFunc
 }
 
 export interface SeriesEncodeOptionMixin {