Generalized the min rotation to min interaction distance.

lib/scatter.js

@@ -286,7 +286,7 @@ export class AbstractScatter extends Throwable {
         scaleCloseThreshold = 0.1,
         scaleCloseBuffer = 0.05,
         maxRotation = Angle.degree2radian(5),
-        minRotationDistance = 0,
+        minInteractionDistance = 0,
         useLowPassFilter = false
     } = {}) {
         if (rotationDegrees != null && rotation != null) {
@@ -332,7 +332,7 @@ export class AbstractScatter extends Throwable {
         this.mouseZoomFactor = mouseZoomFactor
         this.autoBringToFront = autoBringToFront
         this.useLowPassFilter = useLowPassFilter
-        this.minRotationDistance = minRotationDistance
+        this.minInteractionDistance = minInteractionDistance
         if (useLowPassFilter) {
             this.rotateLPF = new LowPassFilter()
             this.zoomLPF = new LowPassFilter()
@@ -390,9 +390,10 @@ export class AbstractScatter extends Throwable {
                 rotate = this.rotateLPF.next(rotate)
                 zoom = this.zoomLPF.next(zoom)
             }
-            if (delta.distance < this.minRotationDistance) {
-                let ratio = delta.distance / this.minRotationDistance
+            if (delta.distance < this.minInteractionDistance) {
+                let ratio = delta.distance / this.minInteractionDistance
                 rotate *= ratio
+                zoom *= ratio
             }
 
             this.transform(delta, zoom, rotate, delta.about)
@@ -1114,7 +1115,7 @@ export class DOMScatter extends AbstractScatter {
             scaleCloseBuffer = 0.05,
             useLowPassFilter = false,
             maxRotation = Angle.degree2radian(15),
-            minRotationDistance = 200
+            minInteractionDistance = 200
         } = {}
     ) {
         super({
@@ -1141,7 +1142,7 @@ export class DOMScatter extends AbstractScatter {
             onClose,
             useLowPassFilter,
             maxRotation,
-            minRotationDistance
+            minInteractionDistance
         })
         if (container == null || width == null || height == null) {
             throw new Error('Invalid value: null')