feat: added axis.ensureLastLabel and axis.allowLastLabelAboveMax for custom rendering

Author: farfromrefug

src/charting/components/AxisBase.ts

@@ -90,6 +90,10 @@ export abstract class AxisBase extends ComponentBase {
 
     protected mCenterAxisLabels = false;
 
+    public ensureLastLabel = false;
+
+    public allowLastLabelAboveMax = false;
+
     /**
      * the path effect of the axis line that makes dashed lines possible
      */

src/charting/components/YAxis.ts

@@ -109,6 +109,7 @@ export class YAxis extends AxisBase {
         super();
         this.mAxisDependency = position;
         this.mYOffset = 0;
+        this.allowLastLabelAboveMax = true;
     }
 
     public getAxisDependency() {

src/charting/renderer/AxisRenderer.ts

@@ -204,7 +204,10 @@ export abstract class AxisRenderer extends Renderer {
             }
             // use Math.floor(yMax / interval) + 1 instead of
             // Math.floor(yMax / interval) to make sure the axis is showed "above" the higghest value
-            const last = interval === 0 ? 0 : Utils.nextUp(Math.floor(yMax / interval) * interval);
+            let last = interval === 0 ? 0 : Utils.nextUp(Math.floor(yMax / interval) * interval);
+            if (axis.ensureLastLabel && last < max) {
+                last = Math.min(max, last + interval);
+            }
             let f;
             let i;
 
@@ -213,6 +216,9 @@ export abstract class AxisRenderer extends Renderer {
                     ++n;
                 }
             }
+            if (axis.ensureLastLabel && (n - 1) * interval < last) {
+                n++;
+            }
 
             axis.mEntryCount = n;
 
@@ -222,10 +228,12 @@ export abstract class AxisRenderer extends Renderer {
                 axis.mLabels = [];
             }
 
-            for (f = first, i = 0; i < n; f += interval, ++i) {
+            for (f = first, i = 0; i <= n; f += interval, ++i) {
                 if (f === 0.0) {
                     // Fix for negative zero case (Where value == -0.0, and 0.0 == -0.0)
                     f = 0.0;
+                } else if (!axis.allowLastLabelAboveMax && f > max) {
+                    f = max;
                 }
 
                 axis.mEntries[i] = f;