fix getTrianglePath and getBarOpacity return value

src/index.ts

@@ -101,9 +101,30 @@ export class ChartwerkBarPod extends ChartwerkPod<BarTimeSerie, BarOptions> {
     // (x, y) - top left corner
     const Y_OFFSET = 2;
     const correctedY = Math.max(y, Y_OFFSET);
-    return `M ${x - Y_OFFSET} ${correctedY - Y_OFFSET}
-      L ${x + length + Y_OFFSET} ${correctedY - Y_OFFSET}
-      L ${x + length / 2} ${correctedY + length - Y_OFFSET} z`;
+    const correctedLength = length <= 10 ? length : 10;
+
+    let x1 = x - Y_OFFSET;
+    let x2 = x + length + Y_OFFSET;
+    let x1x2Len = x2 - x1;
+
+    let y1 = correctedY - Y_OFFSET;
+    let yM = correctedY + length - Y_OFFSET;
+    if (x1x2Len > correctedLength) {
+      const xDiff = x1x2Len - correctedLength;
+      x1 += xDiff / 2;
+      x2 -= xDiff / 2;
+
+      const yDiff = yM - y1;
+
+      if (xDiff < yDiff) {
+        y1 += (yDiff - xDiff) + Y_OFFSET*3;
+      }
+    }
+    const x3 = x + length / 2;
+
+    return `M ${x1} ${y1}
+      L ${x2} ${y1}
+      L ${x3} ${yM} z`;
   }
 
   getBarOpacity(rowValues: RowValues): number {
@@ -164,7 +185,7 @@ export class ChartwerkBarPod extends ChartwerkPod<BarTimeSerie, BarOptions> {
     const tagrets = _.map(series, serie => serie.target);
     const zippedData = _.zip(keysColumn, zippedValuesColumn, zippedAdditionalValuesColumn, tagrets);
     const data = _.map(zippedData, row => { return { key: row[0], values: row[1], additionalValues: row[2], colors, serieTarget: tagrets } });
-    return data;
+    return data.filter(v => v.key !== undefined);
   }
 
   public renderSharedCrosshair(values: { x?: number, y?: number }): void {